CN115170423A - Method and device for correcting image of flat panel detector - Google Patents
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Abstract
Translated fromChinese
Description
Translated fromChinese技术领域technical field
本发明涉及图像处理技术领域，特别是涉及一种平板探测器图像校正的方法和装置。The present invention relates to the technical field of image processing, in particular to a method and device for image correction of a flat panel detector.
背景技术Background technique
平板探测器以成像速度快、分辨率高等特点著称，广泛应用于医疗检测、无损检测、安检等领域。但在平板探测器成像过程中，受X射线管辐照光场均匀性、像素坏点、暗场噪声等因素影响，降低了图像质量，需要进行校正。Flat panel detectors are famous for their fast imaging speed and high resolution, and are widely used in medical testing, non-destructive testing, security inspection and other fields. However, during the imaging process of the flat panel detector, due to the influence of the uniformity of the X-ray tube irradiation light field, pixel dead pixels, dark field noise and other factors, the image quality is reduced, and correction is required.
目前，大多采用分别采集多张图像的方法进行增益校正和缺陷校正，校正效果好，图像质量高，但针对Tomo等应用场景，存在需要采集图像的数量较多、X射线辐照要求多、缺陷模板计算过程复杂等缺点，费时费力；也有通过一张图进行增益校正的方法，虽方便快捷，但是该方法校正后图像噪声大，比多张图校正后图像的噪声大幅提高，会造成平板探测器的噪声等效剂量(NED)、噪声功率谱(NPS)、量子探测效率(DQE)等关键评价指标下降。因此，目前平板探测器的图像校正质量差。At present, most of the methods of acquiring multiple images separately are used for gain correction and defect correction. The correction effect is good and the image quality is high. However, for Tomo and other application scenarios, there are a large number of images to be acquired, many X-ray irradiation requirements, and defects. The template calculation process is complicated, which is time-consuming and labor-intensive. There is also a method of performing gain correction through one image. Although it is convenient and fast, the image noise after correction by this method is larger than that after correction by multiple images, which will cause flat detection. The key evaluation indicators such as noise equivalent dose (NED), noise power spectrum (NPS), and quantum detection efficiency (DQE) of the detector decreased. Therefore, the image correction quality of current flat panel detectors is poor.
发明内容SUMMARY OF THE INVENTION
鉴于以上所述现有技术的缺点，本发明的目的在于提供一种平板探测器图像校正的方法和装置，用于解决现有技术中平板探测器的图像校正质量差的问题。In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method and apparatus for image correction of a flat panel detector, which is used to solve the problem of poor image correction quality of a flat panel detector in the prior art.
为实现上述目的及其他相关目的，本发明提供一种平板探测器图像校正的方法，其特征在于，所述方法至少包括：In order to achieve the above purpose and other related purposes, the present invention provides a method for image correction of a flat panel detector, characterized in that the method at least includes:
采集射线源辐照在初始角度的亮场图像，并对所述初始角度的亮场图像进行处理得到初始角度的增益校正模板；collecting a bright-field image irradiated by the ray source at an initial angle, and processing the bright-field image at the initial angle to obtain a gain correction template of the initial angle;
预设多个摆动角度，并采集射线源辐照在每个摆动角度的一张亮场图像；其中，所述摆动角度与初始角度不同；Presetting multiple swing angles, and collecting a bright-field image irradiated by the ray source at each swing angle; wherein the swing angle is different from the initial angle;
根据所述初始角度的增益校正模板对所有所述摆动角度的亮场图像进行处理得到每个摆动角度的光场转化系数模板；According to the gain correction template of the initial angle, the bright field images of all the swing angles are processed to obtain the light field conversion coefficient template of each swing angle;
根据初始角度的光场转换系数模板和所有摆动角度的光场转化系数模板得到角度光场转换函数；According to the light field conversion coefficient template of the initial angle and the light field conversion coefficient template of all swing angles, the angle light field conversion function is obtained;
基于所述角度光场转换函数得到待测角度的增益校正模板；Obtain a gain correction template of the angle to be measured based on the angular light field conversion function;
根据所述待测角度的增益校正模板对待测角度的亮场图像进行增益校正，并得到待测角度的校正图像。Gain correction is performed on the bright-field image of the angle to be measured according to the gain correction template of the angle to be measured, and a corrected image of the angle to be measured is obtained.
优选地，对所述初始角度的亮场图像进行处理得到初始角度的增益校正模板包括：Preferably, processing the bright-field image of the initial angle to obtain the gain correction template of the initial angle includes:
对所述初始角度的亮场图像进行处理得到初始角度的灰度参考值；processing the bright-field image of the initial angle to obtain a grayscale reference value of the initial angle;
根据所述初始角度的灰度参考值和所述初始角度的亮场图像得到初始角度的增益校正模板。The gain correction template of the initial angle is obtained according to the gray reference value of the initial angle and the bright field image of the initial angle.
优选地，采集射线源辐照在初始角度的某一个曝光剂量或者多个不同曝光剂量时的亮场图像；Preferably, collecting bright-field images when the radiation source is irradiated at a certain exposure dose or multiple different exposure doses at the initial angle;
当采集射线源辐照在初始角度的某一个曝光剂量时的亮场图像，得到一个初始角度的增益校正模板；When collecting the bright-field image when the radiation source is irradiated at a certain exposure dose of the initial angle, a gain correction template of the initial angle is obtained;
当采集射线源辐照在初始角度的多个不同曝光剂量时的亮场图像，得到多个初始角度的增益校正模板。When collecting bright-field images when the radiation source irradiates multiple different exposure doses at the initial angle, gain correction templates for multiple initial angles are obtained.
优选地，根据所述初始角度的增益校正模板对所有所述摆动角度的亮场图像进行处理得到每个摆动角度的光场转化系数模板包括：Preferably, processing the bright field images of all the swing angles according to the gain correction template of the initial angle to obtain the light field conversion coefficient template of each swing angle includes:
根据所述初始角度的增益校正模板对每个摆动角度的亮场图像进行处理得到每个摆动角度的偏光图像；According to the gain correction template of the initial angle, the bright-field image of each swing angle is processed to obtain the polarized light image of each swing angle;
对各个摆动角度的偏光图像进行处理得到各个摆动角度的光场转换系数模板。The polarized light images of each swing angle are processed to obtain the light field conversion coefficient template of each swing angle.
优选地，根据所述初始角度的增益校正模板对每个摆动角度的亮场图像进行处理得到每个摆动角度的偏光图像包括：Preferably, processing the bright-field image of each swing angle according to the gain correction template of the initial angle to obtain the polarized light image of each swing angle includes:
根据所述初始角度的增益校正模板和所述摆动角度的亮场图像确定摆动角度的增益校正参考模板；Determine the gain correction reference template of the swing angle according to the gain correction template of the initial angle and the bright field image of the swing angle;
根据各个摆动角度的增益校正参考模板和各个摆动角度的亮场图像得到各个摆动角度的偏光图像。The polarized images of each swing angle are obtained according to the gain correction reference template of each swing angle and the bright field image of each swing angle.
优选地，当初始角度的增益校正模板有一个时，每个摆动角度的增益校正参考模板的确定方式为：Preferably, when there is one gain correction template for the initial angle, the determination method of the gain correction reference template for each swing angle is:
(1)获取摆动角度的灰度参考值(即摆动角度的亮场图像的灰度参考值)；(1) Obtain the grayscale reference value of the swing angle (that is, the grayscale reference value of the bright-field image of the swing angle);
(2)根据摆动角度的灰度参考值与初始角度的增益校正模板得到摆动角度的增益校正参考模板。(2) Obtain the gain correction reference template of the swing angle according to the gray reference value of the swing angle and the gain correction template of the initial angle.
优选地，当初始角度的增益校正模板有多个时，每个摆动角度的增益校正参考模板的确定方式为：Preferably, when there are multiple gain correction templates for the initial angle, the method for determining the gain correction reference template for each swing angle is:
(1)获取摆动角度的灰度参考值(即摆动角度的亮场图像的灰度参考值)；(1) Obtain the grayscale reference value of the swing angle (that is, the grayscale reference value of the bright-field image of the swing angle);
(2)根据摆动角度的灰度参考值和多个初始角度的灰度参考值确定初始角度的增益校正模板；(2) Determine the gain correction template of the initial angle according to the grayscale reference value of the swing angle and the grayscale reference values of a plurality of initial angles;
(3)根据摆动角度的灰度参考值与摆动角度的增益校正参考模板到摆动角度的增益校正模板。(3) The reference template is corrected to the gain correction template of the swing angle according to the gray reference value of the swing angle and the gain of the swing angle.
优选地，对每个摆动角度的偏光图像进行处理的摆动角度的光场转换系数模板的过程包括：Preferably, the process of processing the polarization image of each swing angle of the light field conversion coefficient template of the swing angle includes:
对摆动角度的偏光图像进行归一处理得到偏光图像的归一灰度值；Normalize the polarized image of the swing angle to obtain the normalized gray value of the polarized image;
根据所述偏光图像的归一灰度值和对应的偏光图像得到摆动角度的光场转换系数模板。The light field conversion coefficient template of the swing angle is obtained according to the normalized gray value of the polarized light image and the corresponding polarized light image.
优选地，基于所述角度光场转换函数得到待测角度的增益校正模板包括Preferably, obtaining the gain correction template for the angle to be measured based on the angular light field conversion function includes:
基于所述角度光场转换函数得到待测角度的光场转换系数模板；Obtaining a light field conversion coefficient template of the angle to be measured based on the angle light field conversion function;
根据待测角度的光场转换系数模板和待测角度的增益校正参考模板得到待测角度的增益校正模板。The gain correction template of the angle to be measured is obtained according to the optical field conversion coefficient template of the angle to be measured and the gain correction reference template of the angle to be measured.
为实现上述目的及其他相关目的，本发明还提供一种平板探测器图像校正的装置，包括存储器、处理器以及存储在所述存储器中并可在所述处理器上运行的程序，所述处理器执行所述程序时，实现上述的平板探测器的亮场图像进行校正的方法的步骤。In order to achieve the above object and other related objects, the present invention also provides an apparatus for image correction of a flat panel detector, comprising a memory, a processor, and a program stored in the memory and running on the processor, the processing When the computer executes the program, the steps of the above-mentioned method for correcting the bright field image of the flat panel detector are realized.
如上所述，本发明的对平板探测器的增益校正模板产生方法和图像校正方法，具有以下有益效果：As described above, the method for generating a gain correction template for a flat panel detector and an image correction method of the present invention have the following beneficial effects:
本发明首先采集射线源辐照在初始角度的亮场图像和预设的多个摆动角度的一张亮场图像，并对所述初始角度的亮场图像进行处理得到初始角度的增益校正模板；然后根据所述初始角度的增益校正模板对所有所述摆动角度的亮场图像进行处理得到每个摆动角度的光场转化系数模板；其次根据初始角度的光场转换系数模板和所有摆动角度的光场转化系数模板得到角度光场转换函数；再基于所述角度光场转换函数得到待测角度的增益校正模板；最后根据所述待测角度的增益校正模板对待测角度的亮场图像进行增益校正，并得到待测角度的校正图像。本发明能够对快速的对多个角度进行增益校正，同时还解决现有技术需求采图数量多或者图像噪声大等技术缺陷，提高了工作效率，降低了工作成本。The present invention first collects a bright-field image irradiated by a ray source at an initial angle and a bright-field image of a plurality of preset swing angles, and processes the bright-field image of the initial angle to obtain a gain correction template of the initial angle; Then, according to the gain correction template of the initial angle, the bright field images of all the swing angles are processed to obtain the light field conversion coefficient template of each swing angle; The field conversion coefficient template obtains the angle light field conversion function; then based on the angle light field conversion function, the gain correction template of the angle to be measured is obtained; finally, the bright field image of the angle to be measured is gain corrected according to the gain correction template of the angle to be measured , and get the corrected image of the angle to be measured. The invention can quickly perform gain correction for multiple angles, and also solves the technical defects of the prior art, such as a large number of images or large image noise, which improves the work efficiency and reduces the work cost.
附图说明Description of drawings
图1显示为本发明平板探测器的射线源的摆动示意图。FIG. 1 is a schematic diagram showing the swing of the radiation source of the flat panel detector of the present invention.
图2显示为本发明平板探测器图像校正的方法流程示意图。FIG. 2 is a schematic flowchart of a method for image correction of a flat panel detector according to the present invention.
具体实施方式Detailed ways
以下通过特定的具体实例说明本发明的实施方式，本领域技术人员可由本说明书所揭露的内容轻易地了解本发明的其他优点与功效。本发明还可以通过另外不同的具体实施方式加以实施或应用，本说明书中的各项细节也可以基于不同观点与应用，在没有背离本发明的精神下进行各种修饰或改变。The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.
请参阅图1-2。需要说明的是，本实施例中所提供的图示仅以示意方式说明本发明的基本构想，遂图式中仅显示与本发明中有关的组件而非按照实际实施时的组件数目、形状及尺寸绘制，其实际实施时各组件的型态、数量及比例可为一种随意的改变，且其组件布局型态也可能更为复杂。See Figure 1-2. It should be noted that the drawings provided in this embodiment are only to illustrate the basic concept of the present invention in a schematic way, so the drawings only show the components related to the present invention rather than the number, shape and the number of components in actual implementation. For dimension drawing, the type, quantity and proportion of each component can be changed at will in actual implementation, and the component layout may also be more complicated.
方法实施例：Method example:
如图1所示为本发明平板探测器的射线源的摆动示意图，图2所示为平板探测器图像校正的方法流程图，结合图1-2对本发明中平板探测器图像校正的方法进行详细介绍，所述方法包括：FIG. 1 is a schematic diagram of the swing of the radiation source of the flat panel detector of the present invention, and FIG. 2 is a flow chart of the method for image correction of the flat panel detector. The method for image correction of the flat panel detector in the present invention is described in detail with reference to FIGS. 1-2. Introduction, the method includes:
S1，采集射线源辐照在初始角度的亮场图像，并对所述初始角度的亮场图像进行处理得到初始角度的增益校正模板；S1, collecting a bright-field image irradiated by a ray source at an initial angle, and processing the bright-field image at the initial angle to obtain a gain correction template of the initial angle;
本发明在探测器开机并预热完成后，采集射线源辐照在初始角度的亮场图像。In the present invention, after the detector is turned on and preheated, the bright-field image irradiated by the ray source at the initial angle is collected.
在本发明实施例中，采集射线源辐照在初始角度的某一个曝光剂量或者多个不同曝光剂量时的亮场图像；In the embodiment of the present invention, collecting bright-field images when the radiation source is irradiated at a certain exposure dose or multiple different exposure doses at an initial angle;
其中，在一个曝光剂量下可以采集一张亮场图像，也可以重复采集多张亮场图像；多个不同曝光剂量下至少采集的亮场图像数量与曝光剂量的数量相同。Wherein, one bright-field image can be collected under one exposure dose, or multiple bright-field images can be collected repeatedly; at least the number of bright-field images collected under multiple different exposure doses is the same as the number of exposure doses.
在本发明实施例中，对所述初始角度的亮场图像进行处理得到初始角度的增益校正模板包括：In the embodiment of the present invention, processing the bright-field image of the initial angle to obtain the gain correction template of the initial angle includes:
S11，对所述初始角度的亮场图像进行处理得到初始角度的灰度参考值；S11, processing the bright-field image of the initial angle to obtain a grayscale reference value of the initial angle;
本发明对采集射线源辐照在初始角度的某一个曝光剂量时的亮场图像进行处理得到一个初始角度的灰度参考值；The invention processes the bright field image collected when the ray source is irradiated at a certain exposure dose of the initial angle to obtain a grayscale reference value of the initial angle;
对采集射线源辐照在初始角度的多个不同曝光剂量时的亮场图像进行处理得到多个初始角度的灰度参考值；初始角度的灰度参考值的数量与曝光剂量的数量相同。A plurality of gray reference values of initial angles are obtained by processing bright-field images collected when the ray source irradiates multiple different exposure doses at the initial angle; the number of gray reference values of the initial angle is the same as the number of exposure doses.
其中，灰度参考值是指亮场图像中每个像素点的灰度值都相同；具体的，将亮场图像的每个像素的灰度值求平均，再将平均灰度值赋给每个像素点，那么每个像素点的相同灰度值为均值，作为其他实施方式，灰度参考值为中值、最大值等。The gray reference value means that the gray value of each pixel in the bright field image is the same; specifically, the gray value of each pixel in the bright field image is averaged, and then the average gray value is assigned to each pixel. pixel points, then the same grayscale value of each pixel point is the mean value, and as another implementation manner, the grayscale reference value is the median value, the maximum value, and the like.
具体的，射线源辐照在初始角度的某一个曝光剂量时采集一张亮场图像，对该张亮场图像进行处理得到灰度参考值；Specifically, a bright-field image is collected when the radiation source irradiates a certain exposure dose at an initial angle, and the gray-scale reference value is obtained by processing the bright-field image;
具体的，射线源辐照在初始角度的某一个曝光剂量时采集一组亮场图像(多张亮场图像)，对多张亮场图像进行处理得到各张亮场图像的子灰度值参考值，然后对所有亮场图像的子灰度参考值进行求平均处理得到该组亮场图像在初始角度的灰度参考值，即一个初始角度的灰度参考值；Specifically, a set of bright-field images (multiple bright-field images) are collected when the radiation source irradiates a certain exposure dose at the initial angle, and the sub-gray value reference of each bright-field image is obtained by processing the multiple bright-field images. value, and then average the sub-gray reference values of all bright-field images to obtain the gray-scale reference value of the group of bright-field images at the initial angle, that is, the gray-scale reference value of an initial angle;
具体的，射线源辐照在初始角度的多个不同曝光剂量时采集多个亮场图像时，对多个亮场图进行处理得到每个曝光剂量对应在初始角度的灰度参考值；其中，每个曝光剂量下是获取一张或者多张都可以，且每个曝光剂量在初始角度的灰度参考值的处理过程跟上述射线源辐照在初始角度的某一个曝光剂量时采集一张亮场图像或多张亮场图像得到初始角度的灰度参考值的处理过程相同。Specifically, when the ray source irradiates and collects multiple bright-field images at multiple different exposure doses at the initial angle, the multiple bright-field images are processed to obtain a grayscale reference value corresponding to each exposure dose at the initial angle; wherein, One or more photos can be obtained under each exposure dose, and the processing process of the gray reference value of each exposure dose at the initial angle is the same as the acquisition of a bright photo when the above-mentioned radiation source irradiates a certain exposure dose at the initial angle. The process of obtaining the gray-scale reference value of the initial angle from the field image or multiple bright-field images is the same.
在此需要说明的是，亮场图像在初始角度的灰度参考值可以为图像全域或者局部区域，It should be noted here that the gray reference value of the bright field image at the initial angle can be the entire image area or the local area,
S12，根据所述初始角度的灰度参考值和所述初始角度的亮场图像得到初始角度的增益校正模板。S12: Obtain a gain correction template of the initial angle according to the gray reference value of the initial angle and the bright field image of the initial angle.
先获取初始角度的亮场图像的灰度原始值，根据灰度原始值和灰度参考值得到初始角度的增益校正模板；First obtain the original gray value of the bright field image of the initial angle, and obtain the gain correction template of the initial angle according to the original gray value and the gray reference value;
根据步骤S11可知，本发明初始角度的灰度参考值有一个或多个。According to step S11, it can be known that there are one or more grayscale reference values of the initial angle of the present invention.
当初始角度的灰度参考值有一个时，得到一个初始角度的增益校正模板；When there is one gray reference value of the initial angle, a gain correction template of the initial angle is obtained;
当初始角度的灰度参考值有多个时，得到多个初始角度的增益校正模板；其中，初始角度的增益校正模板的数量与初始角度的灰度参考值的数量相同。When there are multiple grayscale reference values of the initial angle, multiple gain correction templates of the initial angle are obtained; wherein, the number of the gain correction templates of the initial angle is the same as the number of grayscale reference values of the initial angle.
具体的，先分别获取初始角度在不同曝光剂量时亮场图像的灰度原始值，根据各灰度原始值和灰度参考值得到初始角度的不同增益校正模板。Specifically, the original gray value of the bright-field image at different exposure doses at the initial angle is obtained first, and different gain correction templates for the initial angle are obtained according to each original gray value and the gray reference value.
S2，预设多个摆动角度，并采集射线源辐照在每个摆动角度的一张亮场图像；其中，所述摆动角度与初始角度不同；S2, preset multiple swing angles, and collect a bright-field image irradiated by the ray source at each swing angle; wherein, the swing angle is different from the initial angle;
本发明实施例中，若当前平板探测器有相同类型平板探测器，则根据其相同类型平板探测器的摆动规律对摆动角度进行设定；作为其他实施方式，也可以根据技术人员的需求进行设置。例如，摆动角度的设置为±5°、±10°、±20°等。In the embodiment of the present invention, if the current flat panel detector has the same type of flat panel detector, the swing angle is set according to the swing law of the same type of flat panel detector; as other implementations, it can also be set according to the needs of technicians . For example, the setting of the swing angle is ±5°, ±10°, ±20°, or the like.
S3，根据所述初始角度的增益校正模板对所有所述摆动角度的亮场图像进行处理得到每个摆动角度的光场转化系数模板；S3, processing the bright field images of all the swing angles according to the gain correction template of the initial angle to obtain a light field conversion coefficient template of each swing angle;
本步骤旨在获取各个摆动角度的光场转化系数模板，具体包括：The purpose of this step is to obtain the light field conversion coefficient template of each swing angle, which specifically includes:
S31，根据所述初始角度的增益校正模板对每个摆动角度的亮场图像进行处理得到每个摆动角度的偏光图像；S31, processing the bright field image of each swing angle according to the gain correction template of the initial angle to obtain a polarized light image of each swing angle;
根据所述初始角度的增益校正模板对每个摆动角度的亮场图像进行处理得到每个摆动角度的偏光图像包括：Processing the bright-field image of each swing angle according to the gain correction template of the initial angle to obtain the polarized light image of each swing angle includes:
S311，根据所述初始角度的增益校正模板和所述摆动角度的亮场图像确定摆动角度的增益校正参考模板；S311, determining a gain correction reference template of the swing angle according to the gain correction template of the initial angle and the bright-field image of the swing angle;
本步骤具体是根据所述初始角度的增益校正模板和所述各个摆动角度的亮场图像的原始灰度值确定各个摆动角度的增益校正参考模板；This step specifically determines the gain correction reference template of each swing angle according to the gain correction template of the initial angle and the original gray value of the bright field image of each swing angle;
由于本发明的初始角度的增益校正模板有一个或多个，因此，当初始角度的增益校正模板的数量不同时，摆动角度的增益校正参考模板的确定方式不同。Since the present invention has one or more gain correction templates for the initial angle, when the number of the gain correction templates for the initial angle is different, the way of determining the gain correction reference template for the swing angle is different.
当初始角度的增益校正模板有一个时，每个摆动角度的增益校正参考模板的确定方式为：When there is one gain correction template for the initial angle, the gain correction reference template for each swing angle is determined as follows:
(1)获取摆动角度的灰度参考值(即摆动角度的亮场图像的灰度参考值)；(1) Obtain the grayscale reference value of the swing angle (that is, the grayscale reference value of the bright-field image of the swing angle);
本步骤中，摆动角度的灰度参考值获取方式与初始角度的灰度参考值的获取方式相同。In this step, the acquisition method of the grayscale reference value of the swing angle is the same as the acquisition method of the grayscale reference value of the initial angle.
(2)根据摆动角度的灰度参考值与初始角度的增益校正模板得到摆动角度的增益校正参考模板；(2) obtain the gain correction reference template of the swing angle according to the gray reference value of the swing angle and the gain correction template of the initial angle;
本步骤是将摆动角度的灰度参考值与初始角度的增益校正模板进行耦合得到摆动角度的增益校正参考模板；耦合过程如下：In this step, the gray reference value of the swing angle is coupled with the gain correction template of the initial angle to obtain the gain correction reference template of the swing angle; the coupling process is as follows:
初始角度的增益校正模板×摆动角度的灰度参考值＝摆动角度的增益校正参考模板当初始角度的增益校正模板有多个时，每个摆动角度的增益校正参考模板的确定方式为：The gain correction template of the initial angle × the grayscale reference value of the swing angle = the gain correction reference template of the swing angle When there are multiple gain correction templates of the initial angle, the determination method of the gain correction reference template of each swing angle is as follows:
(1)获取摆动角度的灰度参考值(即摆动角度的亮场图像的灰度参考值)；(1) Obtain the grayscale reference value of the swing angle (that is, the grayscale reference value of the bright-field image of the swing angle);
本步骤中，摆动角度的灰度参考值获取方式与初始角度的灰度参考值的获取方式相同。In this step, the acquisition method of the grayscale reference value of the swing angle is the same as the acquisition method of the grayscale reference value of the initial angle.
(2)根据摆动角度的灰度参考值和多个初始角度的灰度参考值确定初始角度的增益校正模板；(2) Determine the gain correction template of the initial angle according to the grayscale reference value of the swing angle and the grayscale reference values of a plurality of initial angles;
本步骤中，先确定摆动角度的灰度参考值与多个初始角度的灰度参考值之间的关系，然后再重新确定各个摆动角度的增益校正模板；具体如下：In this step, first determine the relationship between the grayscale reference value of the swing angle and the grayscale reference values of multiple initial angles, and then re-determine the gain correction template of each swing angle; the details are as follows:
如果摆动角度的灰度参考值位于其中两个初始角度的灰度参考值之间，通过插值法得到摆动角度的增益校正参考模板；If the gray reference value of the swing angle is between the gray reference values of the two initial angles, the gain correction reference template of the swing angle is obtained by interpolation;
如果摆动角度的灰度值小于最小初始角度的灰度参考值，则将最小初始角度的灰度参考值对应的初始角度的增益校正模板作为该摆动角度的增益校正参考模板；If the grayscale value of the swing angle is less than the grayscale reference value of the minimum initial angle, the gain correction template of the initial angle corresponding to the grayscale reference value of the minimum initial angle is used as the gain correction reference template of the swing angle;
如果摆动角度的灰度值大于最大初始角度的灰度参考值，则将最大初始角度的灰度参考值对应的初始角度的增益校正模板作为该摆动角度的增益校正参考模板；If the grayscale value of the swing angle is greater than the grayscale reference value of the maximum initial angle, the gain correction template of the initial angle corresponding to the grayscale reference value of the maximum initial angle is used as the gain correction reference template of the swing angle;
(3)根据摆动角度的灰度参考值与摆动角度的增益校正参考模板到摆动角度的增益校正模板。(3) The reference template is corrected to the gain correction template of the swing angle according to the gray reference value of the swing angle and the gain of the swing angle.
本步骤是将摆动角度的灰度参考值与摆动角度的增益校正参考模板进行耦合得到摆动角度的增益校正模板；耦合过程如下：This step is to couple the gray reference value of the swing angle and the gain correction reference template of the swing angle to obtain the gain correction template of the swing angle; the coupling process is as follows:
摆动角度的增益校正参考模板×摆动角度的灰度参考值＝摆动角度的增益校正模板The gain correction reference template of the swing angle × the grayscale reference value of the swing angle = the gain correction template of the swing angle
S312，根据各个摆动角度的增益校正参考模板和各个摆动角度的亮场图像得到各个摆动角度的偏光图像。S312 , obtaining a polarized light image of each swing angle according to the gain correction reference template of each swing angle and the bright field image of each swing angle.
本步骤先获取各个摆动角度的亮场图像的原始灰度值(即摆动角度的原始灰度值)，然后将摆动角度的原始灰度值与其摆动角度的增益校正参考模板进行耦合得到摆动角度的偏光图像。那么每个摆动角度的偏光图像的耦合方式为：In this step, the original gray value of the bright-field image of each swing angle (that is, the original gray value of the swing angle) is obtained first, and then the original gray value of the swing angle and the gain correction reference template of the swing angle are coupled to obtain the value of the swing angle. Polarized image. Then the coupling method of the polarized image for each swing angle is:
摆动角度的增益校正参考模板×摆动角度的原始灰度值＝摆动角度的偏光图像The gain correction reference template of the swing angle × the original gray value of the swing angle = the polarized image of the swing angle
S32，对各个摆动角度的偏光图像进行处理得到各个摆动角度的光场转换系数模板。S32 , process the polarized light images of each swing angle to obtain a light field conversion coefficient template of each swing angle.
在本步骤中，对每个摆动角度的偏光图像进行处理的摆动角度的光场转换系数模板的过程包括：In this step, the process of processing the polarization image of each swing angle of the light field conversion coefficient template of the swing angle includes:
S321，对摆动角度的偏光图像进行归一处理得到偏光图像的归一灰度值；S321, performing normalization processing on the polarized light image of the swing angle to obtain a normalized gray value of the polarized light image;
本步骤中，先获取摆动角度的偏光图像的灰度原始值，然后再根据偏光图像的灰度原始值得到偏光图像的归一灰度值，其中，得到偏光图像的归一灰度值的归一处理过程与得到初始角度的灰度参考值的处理过程相同，那么，归一灰度值指偏光图像中每个像素点的灰度值都相同。In this step, the original gray value of the polarized light image of the swing angle is obtained first, and then the normalized gray value of the polarized light image is obtained according to the original gray value of the polarized light image, wherein the normalized gray value of the normalized gray value of the polarized light image is obtained. The first processing process is the same as that of obtaining the gray reference value of the initial angle. Then, the normalized gray value means that the gray value of each pixel in the polarized light image is the same.
S322，根据所述偏光图像的归一灰度值和对应的偏光图像得到摆动角度的光场转换系数模板。S322, obtaining a light field conversion coefficient template of the swing angle according to the normalized gray value of the polarized light image and the corresponding polarized light image.
本步骤中，先获取摆动角度的偏光图像的灰度原始值，然后再根据偏光图像的灰度原始值和所述偏光图像的归一灰度值得到对应摆动角度的光场转换系数模板；具体如下：In this step, the original grayscale value of the polarized light image of the swing angle is obtained first, and then the light field conversion coefficient template corresponding to the swing angle is obtained according to the original grayscale value of the polarized light image and the normalized grayscale value of the polarized light image; as follows:
S4，根据初始角度的光场转换系数模板和所有摆动角度的光场转化系数模板得到角度光场转换函数；S4, obtain the angle light field conversion function according to the light field conversion coefficient template of the initial angle and the light field conversion coefficient templates of all swing angles;
本发明中，初始角度的光场转换系数无需再进行光场转换，因此，初始角度的光场转换系数模板为1。In the present invention, the light field conversion coefficient of the initial angle does not need to be converted to the light field, therefore, the light field conversion coefficient template of the initial angle is 1.
根据初始角度的光场转换系数模板和所有摆动角度的光场转化系数模板得到角度光场转换函数是将初始角度的光场转换系数和所有摆动角度的光场转化系数进行拟合处理得到角度光场转换函数。具体的，将角度作为自变量，角度对应的光场转换系数模板作为因变量，进行拟合(如多项式、指数函数、三角函数等)处理后就得到角度光场转换函数。因此，得到的角度光场转换函数为角度与对应光场转换系数模板之间的函数关系。According to the light field conversion coefficient template of the initial angle and the light field conversion coefficient template of all swing angles, the angle light field conversion function is obtained by fitting the light field conversion coefficient of the initial angle and the light field conversion coefficient of all swing angles to obtain the angle light Field transfer function. Specifically, taking the angle as the independent variable and the light field conversion coefficient template corresponding to the angle as the dependent variable, the angle light field conversion function is obtained after fitting (eg, polynomial, exponential, trigonometric, etc.) processing. Therefore, the obtained angular light field conversion function is the functional relationship between the angle and the corresponding light field conversion coefficient template.
S5，基于所述角度光场转换函数得到待测角度的增益校正模板；S5, obtain the gain correction template of the angle to be measured based on the angle light field conversion function;
本步骤旨在重新确定待测角度的增益校正模板，本发明基于所述角度光场转换函数得到待测角度的增益校正模板包括The purpose of this step is to re-determine the gain correction template of the angle to be measured. The present invention obtains the gain correction template of the angle to be measured based on the angle light field conversion function, including:
S51，基于所述角度光场转换函数得到待测角度的光场转换系数模板；S51, obtain the light field conversion coefficient template of the angle to be measured based on the angle light field conversion function;
本步骤中，将待测角度代入至所述角度光场转换函数后就能得到待测角度的光场转换系数模板。In this step, after substituting the angle to be measured into the angle light field conversion function, a light field conversion coefficient template of the angle to be measured can be obtained.
S52，根据待测角度的光场转换系数模板和待测角度的增益校正参考模板得到待测角度的增益校正模板；S52, obtain the gain correction template of the angle to be measured according to the optical field conversion coefficient template of the angle to be measured and the gain correction reference template of the angle to be measured;
本步骤，需先获取待测角度的亮场图像，并确定其原始灰度值，采用步骤S311中的手段重新确定待测角度的增益校正参考模板，然后根据所述待测角度的增益校正参考模板和待测角度的光场转换系数模板确定待测角度的增益校正模板；具体如下：In this step, the bright-field image of the angle to be measured needs to be acquired first, and its original gray value is determined. The method in step S311 is used to re-determine the gain correction reference template of the angle to be measured, and then the reference template for the gain correction of the angle to be measured is re-determined according to the gain of the angle to be measured. The template and the light field conversion coefficient template of the angle to be measured determine the gain correction template of the angle to be measured; the details are as follows:
待测角度的光场转换系数模板×待测角度的增益校正参考模板＝待测角度的增益校正模板 S6，根据所述待测角度的增益校正模板对待测角度的亮场图像进行增益校正，并得到待测角度的校正图像。The light field conversion coefficient template of the angle to be measured × the gain correction reference template of the angle to be measured=the gain correction template of the angle to be measured S6, the gain correction is performed on the bright field image of the angle to be measured according to the gain correction template of the angle to be measured, and A corrected image of the angle to be measured is obtained.
本步骤通过重新确定的待测角度的增益校正模板对待测角度的亮场图像进行增益校正得到待测角度的校正图像，校正后的待测角度的校正图像更加准确。其中，增益校正过程：In this step, the gain correction of the bright-field image of the angle to be measured is performed on the re-determined gain correction template of the angle to be measured to obtain a corrected image of the angle to be measured, and the corrected image of the corrected angle to be measured is more accurate. Among them, the gain correction process:
待测角度的校正图像＝待测角度的亮场图像的原始灰度值×待测角度增益校正模板Corrected image of the angle to be measured = original gray value of the bright-field image of the angle to be measured × gain correction template of the angle to be measured
本发明实现多角度快速校正，在保证图像质量的前提下，提高了工作效率，节约了成本。The invention realizes multi-angle fast correction, improves work efficiency and saves cost on the premise of ensuring image quality.
装置实施例：Device Example:
为解决上述技术缺陷，本发明还提供一种平板探测器图像校正的装置，所述装置包括存储器、处理器以及存储在所述存储器中并可在所述处理器上运行的程序，处理器执行所述程序时，实现上述平板探测器图像校正的方法的步骤。In order to solve the above technical defects, the present invention also provides a device for image correction of a flat panel detector, the device includes a memory, a processor, and a program stored in the memory and running on the processor, and the processor executes the program. During the program, the steps of the above-mentioned method for image correction of the flat panel detector are realized.
本发明中平板探测器图像校正的方法步骤的详细过程已在方法实施例中详细介绍，此处不再赘述。The detailed process of the method steps for image correction of the flat panel detector in the present invention has been introduced in detail in the method embodiments, and will not be repeated here.
综上所述，本发明提供一种平板探测器图像校正的方法和装置，快速对多个角度进行增益校正的方法，解决现有技术需求采图数量多或者图像噪声大等技术缺陷，提高了工作效率，降低了工作成本。所以，本发明有效克服了现有技术中的种种缺点而具高度产业利用价值。To sum up, the present invention provides a method and device for image correction of a flat panel detector, a method for quickly performing gain correction on multiple angles, and solves the technical defects of the prior art such as the need for a large number of images to be acquired or the image noise is large, and improves the performance of Work efficiency and reduce work costs. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial application value.
上述实施例仅例示性说明本发明的原理及其功效，而非用于限制本发明。任何熟悉此技术的人士皆可在不违背本发明的精神及范畴下，对上述实施例进行修饰或改变。因此，举凡所属技术领域中具有通常知识者在未脱离本发明所揭示的精神与技术思想下所完成的一切等效修饰或改变，仍应由本发明的权利要求所涵盖。The above-mentioned embodiments merely illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can make modifications or changes to the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed in the present invention should still be covered by the claims of the present invention.
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