CN101179663A - Photographing method and system and machine readable medium thereof - Google Patents

Abstract

Translated fromChinese

本发明提供一种拍照方法及系统。首先，于环境光源中获取第一感测图像数据。接着，使用闪光灯进行预闪，并于闪光灯的预闪光源中获取第二感测图像数据。当进行拍照时，依据第一感测图像数据与第二感测图像数据对于感测图像中的每一像素个别进行白平衡校正。

The present invention provides a photographing method and system. First, first sensing image data is obtained in an ambient light source. Then, a flash is used to perform a pre-flash, and second sensing image data is obtained in the pre-flash source of the flash. When taking a photo, white balance correction is performed for each pixel in the sensing image according to the first sensing image data and the second sensing image data.

Description

Translated fromChinese

拍照方法及系统及其机器可读取介质Method and system for taking pictures and machine-readable medium thereof

技术领域technical field

本发明涉及一种拍照方法及系统，且尤其涉及一种可以在包含环境光源与闪光灯光源的双重光源中对于图像中的每一像素个别进行白平衡校正的拍照方法及系统。The present invention relates to a photographing method and system, and in particular to a photographing method and system capable of individually performing white balance correction for each pixel in an image in a dual light source including an ambient light source and a flash light source.

背景技术Background technique

随着时代的进步，相机的发展由传统底片式的相机演变为由图像感测单元，如电荷耦合组件(CCD)或互补性氧化金属半导体(CMOS)取代底片的数码相机。由于数码相机所拍摄出数码照片可以方便地在相关装置，如计算机系统中进行查看与处理，因此，数码相机已经变成现代人生活中的必备品之一。With the progress of the times, the development of the camera has evolved from a traditional film camera to a digital camera in which the film is replaced by an image sensing unit, such as a charge-coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). Since the digital photos taken by the digital camera can be easily viewed and processed in related devices, such as a computer system, the digital camera has become one of the must-haves in modern life.

一般数码相机在环境光源不足的场景中，如在室内，通常会利用闪光灯辅助曝光机制来进行拍照作业。此时，数码相机所感测出的图像除了受到环境光源的影响之外，还受到闪光灯光源的影响。此外，由于闪光灯光源的输出能力有限，因此，场景中不同的区域所受到闪光灯光源的影响也会有所不同。举例来说，有些区域主要会受到闪光灯光源的照明，有些区域则主要受到环境光源的照明，有些区域还会同时受到两种光源不同比例的照明影响。Generally, in a scene where the ambient light source is insufficient, such as indoors, a digital camera usually uses a flashlight to assist the exposure mechanism to take pictures. At this time, the image sensed by the digital camera is not only affected by the ambient light source, but also affected by the light source of the flashlight. In addition, since the output capability of the flash light source is limited, different areas in the scene will be affected differently by the flash light source. For example, some areas will be primarily lit by the flash light source, some areas will be primarily lit by the ambient light source, and some areas will be illuminated by different proportions of both light sources at the same time.

在现存数码相机的白平衡校正机制中，通常对于整张感测图像进行增益调整。举例来说，对于整张感测图像的红色通道(RChannel)与蓝色通道(B Channel)分别乘上一个计算出来的补偿增益(Gain)值。由于熟知的方法无法对于图像中的不同区域分别进行处理，且无法同时处理双重光源的情况，因此，无论是针对闪光灯光源或是环境光源作白平衡校正，都会造成图像局部区域色偏的情形。当环境光源与闪光灯光源的色温(Color Temperature)差距越大时，图像局部区域色偏的情形将会更严重。In the white balance correction mechanism of existing digital cameras, the gain adjustment is usually performed on the entire sensing image. For example, the red channel (RChannel) and the blue channel (B Channel) of the entire sensing image are respectively multiplied by a calculated compensation gain (Gain) value. Since the known methods cannot process different regions of the image separately, and cannot handle dual light sources at the same time, no matter whether the white balance correction is performed on the flash light source or the ambient light source, it will cause color shift in local areas of the image. When the color temperature (Color Temperature) difference between the ambient light source and the flash light source is greater, the color cast in the local area of the image will be more serious.

发明内容Contents of the invention

有鉴于此，本发明提供拍照方法及系统。In view of this, the present invention provides a photographing method and system.

本发明实施例的拍照方法。首先，于一环境光源中获取第一感测图像数据。接着，使用闪光灯进行预闪，并于闪光灯的预闪光源中获取第二感测图像数据。当进行拍照时，依据第一感测图像数据与第二感测图像数据对于感测图像中的每一像素个别进行白平衡校正。The photographing method of the embodiment of the present invention. Firstly, the first sensing image data is acquired in an ambient light source. Next, a flash is used for pre-flash, and second sensing image data is acquired from the pre-flash source of the flash. When taking pictures, the white balance correction is individually performed on each pixel in the sensing image according to the first sensing image data and the second sensing image data.

本发明实施例的拍照系统，至少包括闪光灯、图像感测单元、信号处理器与闪光灯自动白平衡单元。信号处理器通过图像感测单元于环境光源中获取第一感测图像数据。信号处理器致使闪光灯进行预闪，并通过图像感测单元于闪光灯的预闪光源中获取第二感测图像数据。当进行拍照作业时，闪光灯自动白平衡单元依据第一感测图像数据与第二感测图像数据对于感测图像中的每一像素个别进行白平衡校正。The photographing system of the embodiment of the present invention at least includes a flashlight, an image sensing unit, a signal processor and an automatic white balance unit for the flashlight. The signal processor obtains the first sensing image data from the ambient light source through the image sensing unit. The signal processor causes the flash to perform pre-flash, and obtains second sensing image data from the pre-flash source of the flash through the image sensing unit. When taking pictures, the automatic white balance unit of the flashlight individually performs white balance correction for each pixel in the sensed image according to the first sensed image data and the second sensed image data.

本发明实施例的拍照方法。首先，取得环境光源中第一感测图像数据，并取得闪光灯的预闪光源中的第二感测图像数据。依据第一感测图像数据与第二感测图像数据计算纯粹由预闪的闪光灯所提供光源的第三感测图像数据。依据第一感测图像数据计算至少一图像通道的第一白平衡增益，且依据第三感测图像数据计算图像通道的第二白平衡增益。之后，依据第三感测图像数据与主闪闪光灯比例值计算纯粹由主闪的闪光灯所提供光源的第四感测图像数据。依据第一感测图像数据与第四感测图像数据定义第一矩阵与第二矩阵，用以分别记录主闪的闪光灯与环境光源对于预览模式中一图像中每一像素的贡献比例，并依据第一白平衡增益、第二白平衡增益、第一矩阵与第二矩阵定义至少一第三矩阵，用以记录相应预览模式中图像的每一像素相应图像通道的第三白平衡增益。之后，依据第三矩阵内插得到第四矩阵，用以记录相应拍照模式中图像中每一像素的第四白平衡增益。当进行拍照作业时，依据第四矩阵对于感测图像中的每一像素个别进行白平衡校正。The photographing method of the embodiment of the present invention. Firstly, the first sensing image data in the ambient light source is acquired, and the second sensing image data in the pre-flash source of the flash is acquired. According to the first sensing image data and the second sensing image data, the third sensing image data of the light source provided purely by the pre-flash flashlight is calculated. A first white balance gain of at least one image channel is calculated according to the first sensed image data, and a second white balance gain of the image channel is calculated according to the third sensed image data. Afterwards, the fourth sensing image data of the light source provided purely by the flash of the main flash is calculated according to the ratio between the third sensing image data and the flash of the main flash. The first matrix and the second matrix are defined according to the first sensing image data and the fourth sensing image data, which are used to respectively record the contribution ratio of the flash light of the main flash and the ambient light source to each pixel in an image in the preview mode, and according to The first white balance gain, the second white balance gain, the first matrix and the second matrix define at least one third matrix for recording the third white balance gain of the corresponding image channel of each pixel of the image in the corresponding preview mode. Afterwards, a fourth matrix is obtained by interpolation according to the third matrix, which is used to record the fourth white balance gain of each pixel in the image in the corresponding photographing mode. When taking pictures, each pixel in the sensing image is individually corrected for white balance according to the fourth matrix.

本发明上述方法可以通过程序代码方式收录于实体介质中。当程序代码被机器加载且执行时，机器变成用以实行本发明的装置。The above-mentioned method of the present invention can be recorded in a physical medium in the form of program code. When the program code is loaded and executed by the machine, the machine becomes an apparatus for implementing the present invention.

为使本发明的上述目的、特征和优点能更明显易懂，下文特举实施例，并配合附图，详细说明如下。In order to make the above-mentioned objects, features and advantages of the present invention more comprehensible, the following specific examples are given together with the accompanying drawings and described in detail as follows.

附图说明Description of drawings

图1为显示依据本发明实施例的拍照系统的示意图。FIG. 1 is a schematic diagram showing a photographing system according to an embodiment of the present invention.

图2为显示拜耳模式的图像传感器的图像数据的示意图。FIG. 2 is a schematic diagram showing image data of an image sensor in a Bayer pattern.

图3为显示依据本发明实施例的拍照方法的流程图。FIG. 3 is a flowchart showing a photographing method according to an embodiment of the present invention.

具体实施方式Detailed ways

图1显示依据本发明实施例的拍照系统。FIG. 1 shows a camera system according to an embodiment of the present invention.

依据本发明实施例的拍照系统100包括闪光灯单元102、镜头104、图像感测单元106、模拟数字转换器108、信号处理器110、闪光灯自动曝光单元112、自动曝光单元114、闪光灯自动白平衡单元116、自动白平衡单元118与内存单元120。拍照系统100可以是数码相机。Thecamera system 100 according to the embodiment of the present invention includes aflashlight unit 102, alens 104, animage sensing unit 106, an analog-to-digital converter 108, asignal processor 110, a flashlightautomatic exposure unit 112, anautomatic exposure unit 114, and a flashlight automaticwhite balance unit 116 . The automaticwhite balance unit 118 and thememory unit 120 . Thecamera system 100 may be a digital camera.

信号处理器110通过控制镜头104的光圈与快门、图像感测单元106的曝光时间与数据输出模式、模拟数字转换器108的放大倍率以及闪光灯单元102的强度来由图像感测单元106取得预览模式下的原始图像数据。信号处理器110可以将取得的数据储存至内存单元120中。必须说明的是，图像感测组件单元106可以是电荷耦合组件或互补性氧化金属半导体，且图像感测单元106的数据输出模式可以包括预览模式(Preview Mode)与拍照模式(CaptureMode)。其中，预览模式中的原始图像数据是拍照模式中的原始图像数据的子集合。本发明实施例是适用于拜耳模式(Bayer Pattern)的图像传感器原始数据200，如图2所示，其中″R″、″G″与″B″分别表示红色、绿色与蓝色图像通道的数据。注意的是，本发明并不限定于拜耳模式的图像传感器原始数据，任何形式的图像传感器原始数据都适用于本发明。Thesignal processor 110 obtains the preview mode from theimage sensing unit 106 by controlling the aperture and shutter of thelens 104, the exposure time and data output mode of theimage sensing unit 106, the magnification of the analog-to-digital converter 108, and the intensity of theflash unit 102 The raw image data below. Thesignal processor 110 can store the obtained data into thememory unit 120 . It must be noted that theimage sensing unit 106 can be a CCD or CMOS, and the data output mode of theimage sensing unit 106 can include a preview mode and a capture mode. Wherein, the original image data in the preview mode is a subset of the original image data in the photographing mode. The embodiment of the present invention is applicable to image sensor raw data 200 of Bayer Pattern (Bayer Pattern), as shown in FIG. 2, wherein "R", "G" and "B" respectively represent data of red, green and blue image channels . It should be noted that the present invention is not limited to the image sensor raw data of the Bayer pattern, and any form of image sensor raw data is applicable to the present invention.

自动曝光单元114可以对储存在内存单元120中预览模式下的原始图像数据进行分析，以决定适当的曝光参数并回传给信号处理器110。闪光灯自动曝光单元112可以利用两张预览模式下的原始图像数据来决定拍照时闪光灯单元102的输出强度。其中，一张预览模式下的原始图像数据是没有闪光灯光源的情形下图像感测单元106所感测到的图像，另外一张预览模式下的原始图像数据是通过信号处理器110使闪光灯单元102进行预闪，而在闪光灯单元102的预闪光源中图像感测单元106所感测到的图像。自动白平衡单元118可以对储存在内存单元120中预览模式下的原始图像数据进行分析，且依据图像数据与白平衡算法决定适当的白平衡参数。闪光灯自动白平衡单元116可以利用两张预览模式下的原始图像数据与白平衡算法决定拍照时相应每一像素的白平衡参数，如白平衡增益值。类似地，一张预览模式下的原始图像数据是没有闪光灯光源的情形下图像感测单元106所感测到的图像，另外一张预览模式下的原始图像数据是通过信号处理器110使闪光灯单元102进行预闪，而在闪光灯单元102的预闪光源中图像感测单元106所感测到的图像。当每一像素的白平衡参数决定之后，信号处理器110可以对每一像素个别进行白平衡校正。必须提醒的是，依据不同需求可以利用白平衡算法计算出不同的白平衡参数。本发明并不限定于任何的白平衡算法。Theautomatic exposure unit 114 can analyze the raw image data in the preview mode stored in thememory unit 120 to determine an appropriate exposure parameter and send it back to thesignal processor 110 . The flashautomatic exposure unit 112 can use the two raw image data in the preview mode to determine the output intensity of theflash unit 102 when taking pictures. Among them, the original image data in one piece of preview mode is the image sensed by theimage sensing unit 106 under the situation of no flash light source, and the other original image data in the preview mode is made by thesignal processor 110 to make theflashlight unit 102 pre-flash, and the image sensed by theimage sensing unit 106 in the pre-flash source of theflash unit 102 . The automaticwhite balance unit 118 can analyze the raw image data stored in thememory unit 120 in the preview mode, and determine appropriate white balance parameters according to the image data and the white balance algorithm. The flash automaticwhite balance unit 116 can use the original image data in the preview mode and the white balance algorithm to determine the white balance parameters corresponding to each pixel when taking pictures, such as the white balance gain value. Similarly, one piece of raw image data in the preview mode is the image sensed by theimage sensing unit 106 without a flash light source, and the other piece of raw image data in the preview mode is made by thesignal processor 110 to make theflashlight unit 102 The pre-flash is performed, and the image sensed by theimage sensing unit 106 is in the pre-flash source of theflash unit 102 . After the white balance parameter of each pixel is determined, thesignal processor 110 can individually perform white balance correction on each pixel. It must be reminded that different white balance parameters can be calculated by using the white balance algorithm according to different requirements. The present invention is not limited to any white balance algorithm.

图3显示依据本发明实施例的拍照方法，适用于数码相机。FIG. 3 shows a photographing method according to an embodiment of the present invention, which is applicable to a digital camera.

如步骤S302，信号处理器110通过镜头104与图像感测单元106于环境光源中获取第一感测图像数据(PreviewBayerData_NoPreflash)。如步骤S304，信号处理器110使闪光灯单元102进行预闪，并通过镜头104与图像感测单元106于闪光灯单元102的预闪光源中获取第二感测图像数据(PreviewBayerData_Preflash)。之后，如步骤S306，闪光灯自动白平衡单元116将第二感测图像数据与第一感测图像数据进行图像相减，从而得到纯粹由预闪的闪光灯单元102所提供光源的第三感测图像数据(PreviewBayerData_PurePreflash)。In step S302 , thesignal processor 110 acquires first sensed image data (PreviewBayerData_NoPreflash) in ambient light through thelens 104 and theimage sensing unit 106 . In step S304 , thesignal processor 110 enables theflash unit 102 to perform a pre-flash, and acquires second sensing image data (PreviewBayerData_Preflash) from the pre-flash source of theflash unit 102 through thelens 104 and theimage sensing unit 106 . Afterwards, as in step S306, the flashlight automaticwhite balance unit 116 subtracts the second sensed image data from the first sensed image data, thereby obtaining a third sensed image of the light source provided purely by theflashlight unit 102 for pre-flash Data (PreviewBayerData_PurePreflash).

如步骤S308，自动白平衡单元118依据第一感测图像数据计算图像通道，如红色通道与蓝色通道的第一白平衡增益(Rgain_NoFlash与Bgain_NoFlash)，且自动白平衡单元118依据第三感测图像数据计算图像通道的第二白平衡增益(Rgain_PureFlash与Bgain_PureFlash)。之后，如步骤S310，闪光灯自动白平衡单元116依据第三感测图像数据与由闪光灯自动曝光单元112所计算出的主闪闪光灯比例值(MainFlashRatio)计算纯粹由主闪的闪光灯单元102所提供光源的第四感测图像数据(PreviewBayerData_PureMainflash)。其中，主闪闪光灯比例值是指当拍照时所需的主闪的闪光灯单元102的输出强度相对于预闪的闪光灯单元102的输出强度的比例值。In step S308, the automaticwhite balance unit 118 calculates the first white balance gain (Rgain_NoFlash and Bgain_NoFlash) of the image channel according to the first sensed image data, such as the red channel and the blue channel, and the automaticwhite balance unit 118 calculates the first white balance gain (Rgain_NoFlash and Bgain_NoFlash) according to the third sensed image data. The image data calculates the second white balance gain (Rgain_PureFlash and Bgain_PureFlash) of the image channel. Afterwards, as in step S310, the flash automaticwhite balance unit 116 calculates the light source provided purely by theflash unit 102 of the main flash according to the third sensed image data and the main flash ratio (MainFlashRatio) calculated by the flashautomatic exposure unit 112 The fourth sensing image data (PreviewBayerData_PureMainflash). Wherein, the master flash ratio value refers to the ratio value of the output intensity of theflash unit 102 of the main flash relative to the output intensity of theflash unit 102 of the pre-flash when taking pictures.

接着，如步骤S312，闪光灯自动白平衡单元116依据第一感测图像数据与第四感测图像数据定义第一矩阵([MainFlashContributiveFactor])与第二矩阵([NoFlashContributiveFactor])。其中，第一矩阵与第二矩阵的维度与预览模式中的感测图像数据的维度相同，且第一矩阵记录主闪的闪光灯单元102对于预览模式中图像中每一像素的贡献比例，而第二矩阵记录环境光源对于预览模式中图像中每一像素的贡献比例。Next, in step S312 , the flash automaticwhite balance unit 116 defines a first matrix ([MainFlashContributiveFactor]) and a second matrix ([NoFlashContributiveFactor]) according to the first sensing image data and the fourth sensing image data. Wherein, the dimensions of the first matrix and the second matrix are the same as those of the sensed image data in the preview mode, and the first matrix records the contribution ratio of theflash unit 102 of the main flash to each pixel in the image in the preview mode, and the second matrix The second matrix records the proportion of the contribution of the ambient light source to each pixel in the image in preview mode.

第一矩阵([MainFlashContributiveFactor])与第二矩阵([NoFlashContributiveFactor])的计算公式如下：The calculation formulas of the first matrix ([MainFlashContributiveFactor]) and the second matrix ([NoFlashContributiveFactor]) are as follows:

[MainFlashContributiveFactor]＝PreviewBayerData_PureMainflash/(PreviewBayerData_PureMainflash+PreviewBayerData_NoPreflash)；[MainFlashContributiveFactor]=PreviewBayerData_PureMainflash/(PreviewBayerData_PureMainflash+PreviewBayerData_NoPreflash);

[NoFlashContributiveFactor]＝PreviewBayerData_NoPreflash/(PreviewBayerData_PureMainflash+PreviewBayerData_NoPreflash)；[NoFlashContributiveFactor] = PreviewBayerData_NoPreflash/(PreviewBayerData_PureMainflash+PreviewBayerData_NoPreflash);

之后，如步骤S314，闪光灯自动白平衡单元116依据第一白平衡增益、第二白平衡增益、第一矩阵与第二矩阵定义至少一第三矩阵([RgainTablel]与[BgainTablel])，用以分别记录相应预览模式中图像的每一像素相应图像通道(R Channel与B Channel)的第三白平衡增益。其中，第三矩阵的维度与预览模式中的感测图像数据的维度相同。Afterwards, as in step S314, the flash autowhite balance unit 116 defines at least one third matrix ([RgainTable1] and [BgainTable1]) according to the first white balance gain, the second white balance gain, the first matrix and the second matrix, for Record the third white balance gain of the corresponding image channel (R Channel and B Channel) of each pixel of the image in the corresponding preview mode respectively. Wherein, the dimensions of the third matrix are the same as the dimensions of the sensed image data in the preview mode.

第三矩阵([RgainTablel]与[BgainTablel])的计算公式如下：The calculation formula of the third matrix ([RgainTablel] and [BgainTablel]) is as follows:

[RgainTablel]＝Rgain_NoFlash*[NoFlashContributiveFactor]+Rgain_PureFlash*[MainFlashContributiveFactor]；[RgainTablel]=Rgain_NoFlash*[NoFlashContributiveFactor]+Rgain_PureFlash*[MainFlashContributiveFactor];

[BgainTablel]＝Bgain_NoFlash*[NoFlashContributiveFactor]+Bgain_PureFlash*[MainFlashContributiveFactor]；[BgainTablel]=Bgain_NoFlash*[NoFlashContributiveFactor]+Bgain_PureFlash*[MainFlashContributiveFactor];

之后，如步骤S316，闪光灯自动白平衡单元116利用内插法，如双线性内插法(Bilinear Interpolation)依据第三矩阵内插得到至少一第四矩阵([RgainTable2]与[BgainTable2])，用以分别记录相应拍照模式中图像中每一像素相应图像通道的第四白平衡增益。其中，第四矩阵的维度与拍照模式中的感测图像数据的维度相同。当实际拍照时，如步骤S318，信号处理器110可以依据闪光灯自动白平衡单元116所计算出的第四矩阵中所记录的第四白平衡增益对于感测图像中的每一像素个别进行白平衡校正。Afterwards, as in step S316, the flash automaticwhite balance unit 116 uses an interpolation method, such as bilinear interpolation (Bilinear Interpolation) to obtain at least a fourth matrix ([RgainTable2] and [BgainTable2]) based on the third matrix interpolation, It is used to respectively record the fourth white balance gain of the corresponding image channel of each pixel in the image in the corresponding photographing mode. Wherein, the dimensions of the fourth matrix are the same as the dimensions of the sensed image data in the photographing mode. When actually taking a picture, as in step S318, thesignal processor 110 can individually perform white balance for each pixel in the sensed image according to the fourth white balance gain recorded in the fourth matrix calculated by the flash automaticwhite balance unit 116 Correction.

本发明的方法，或特定形式或其部份，可以以程序代码的形式包含于实体介质，如软盘、光盘片、硬盘、或是任何其它机器可读取(如计算机可读取)储存介质，其中，当程序代码被机器，如计算机加载且执行时，此机器变成用以参与本发明的装置。本发明的方法与装置也可以以程序代码形式通过一些传送介质，如电线或电缆、光纤、或是任何传输形式进行传送，其中，当程序代码被机器，如计算机接收、加载且执行时，此机器变成用以参与本发明的装置。当在一般用途处理器实际应用时，程序代码结合处理器提供一操作类似于应用特定逻辑电路的独特装置。The method of the present invention, or a specific form or part thereof, may be contained in a physical medium in the form of program code, such as a floppy disk, an optical disk, a hard disk, or any other machine-readable (such as computer-readable) storage medium, Wherein, when the program code is loaded and executed by a machine, such as a computer, the machine becomes a device for participating in the present invention. The method and device of the present invention can also be transmitted in the form of program code through some transmission media, such as wires or cables, optical fibers, or any transmission form, wherein, when the program code is received, loaded and executed by a machine, such as a computer, the The machine becomes the means to participate in the invention. When implemented in a general-purpose processor, the program code combines with the processor to provide a unique device that operates similarly to application-specific logic circuits.

虽然本发明已以优选实施例披露如上，然其并非用以限定本发明，任何本领域技术人员，在不脱离本发明的精神和范围内，可进行一些更动与润饰，因此本发明的保护范围当以所附的权利要求书为准。Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any skilled person can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope should be determined by the appended claims.

主要组件符号说明Explanation of main component symbols

100～拍照系统；          102～闪光灯单元；100～camera system; 102～flash unit;

104～镜头；              106～图像感测单元；104～lens; 106～image sensing unit;

108～模拟数字转换器；    110～信号处理器；108～analog-to-digital converter; 110～signal processor;

112～闪光灯自动曝光单元；      114～自动曝光单元；112～flash automatic exposure unit; 114～automatic exposure unit;

116～闪光灯自动白平衡单元；    118～自动白平衡单元；116～flash automatic white balance unit; 118～automatic white balance unit;

120～内存单元；120～memory unit;

200～拜耳模式的图像传感器原始数据；200~Bayer pattern image sensor raw data;

S302、S304、...、S318～步骤。S302, S304, ..., S318～steps.

Claims (15)

1. a photographic method is applicable to digital camera, and described digital camera has photoflash lamp, and described method comprises the following steps:

In environment light source, obtain the first sensing image data;

Use described photoflash lamp to carry out preflashing, and in the preflashing light source of described photoflash lamp

In obtain the second sensing image data; And

When taking pictures, each pixel in the sensing image is carried out white balance correction individually according to described first sensing image data and the described second sensing image data.

2. photographic method according to claim 1 also comprises the following steps:

According to the described first sensing image data and the described second sensing image data computation purely by the 3rd sensing image data of the light source that described photoflash lamp provides of preflashing;

Described the 3rd sensing image data of foundation are calculated pure the 4th sensing image data by the main light source that described photoflash lamp provides that dodges with the main light modulation ratio value that sparkles;

First white balance gains according at least one image channel of the described first sensing image data computation;

Second white balance gains according to the described image channel of described the 3rd sensing image data computation; And

According to described first white balance gains and described second white balance gains each pixel in the described sensing image is carried out white balance correction individually.

3. photographic method according to claim 2 also comprises the following steps:

According to the described first sensing image data and described the 4th sensing image data definition first matrix and second matrix, in order to write down main described photoflash lamp that dodges and described environment light source contribution proportion respectively for each pixel of image in the preview mode;

According to described first white balance gains, described second white balance gains, described first matrix and at least one the 3rd matrix of described second defined matrix, in order to the 3rd white balance gains of the corresponding described image channel of each pixel that writes down image described in the corresponding described preview mode; And

According to described the 3rd matrix each pixel in the described sensing image is carried out white balance correction individually.

4. photographic method according to claim 2, wherein said image channel comprise red channel (R Channel) or blue channel (B Channel).

5. photographic method according to claim 3 also comprises the following steps:

Obtain the 4th matrix according to described the 3rd matrix interpolation, in order to write down the Sibai balance of each pixel gain in the image in the corresponding exposal model; And

According to described the 4th matrix the pixel in the described sensing image is carried out white balance correction individually.

6. photographic method according to claim 5 also comprises and utilizes bilinear interpolation method to obtain described the 4th matrix according to described the 3rd matrix interpolation.

7. camera system comprises:

Photoflash lamp;

The image sensing unit; And

Signal processor, in order in environment light source, to obtain the first sensing image data by described image sensing unit, make described photoflash lamp carry out preflashing, and in the preflashing light source of described photoflash lamp, obtain the second sensing image data by described image sensing unit, and when taking pictures operation, each pixel in the sensing image is carried out white balance correction individually according to described first sensing image data and the described second sensing image data.

8. camera system according to claim 7, also comprise photoflash lamp Automatic white balance unit, in order to according to the described first sensing image data and the described second sensing image data computation purely by the 3rd sensing image data of the light source that described photoflash lamp provides of preflashing, described the 3rd sensing image data of foundation are calculated pure the 4th sensing image data by the main light source that described photoflash lamp provides that dodges with the main light modulation ratio value that sparkles, and first white balance gains according at least one image channel of the described first sensing image data computation, according to second white balance gains of described the 3rd sensing image data computation described image channel, and each pixel in the described sensing image is carried out white balance correction individually according to described first white balance gains and described second white balance gains.

9. camera system according to claim 8, wherein said photoflash lamp Automatic white balance unit, also according to the described first sensing image data and described the 4th sensing image data definition first matrix and second matrix, in order to write down main described photoflash lamp that dodges and described environment light source contribution proportion respectively for each pixel of image in the preview mode, and according to described first white balance gains, described second white balance gains, described first matrix and at least one the 3rd matrix of described second defined matrix, in order to the 3rd white balance gains of the corresponding described image channel of each pixel that writes down image described in the corresponding described preview mode, and each pixel in the described sensing image is carried out white balance correction individually according to described the 3rd matrix.

10. camera system according to claim 8, wherein said image channel comprises red channel or blue channel.

11. camera system according to claim 9, wherein said photoflash lamp Automatic white balance unit also obtains the 4th matrix according to described the 3rd matrix interpolation, gain in order to the Sibai balance that writes down each pixel of image in the corresponding exposal model, and described signal processor carries out white balance correction according to described the 4th matrix for the individual pixel in the described sensing image.

12. camera system according to claim 11, wherein said photoflash lamp Automatic white balance unit also utilize bilinear interpolation method to obtain described the 4th matrix according to described the 3rd matrix interpolation.

13. a photographic method comprises the following steps:

Obtain the first sensing image data in the environment light source;

Obtain the second sensing image data in the preflashing light source of photoflash lamp;

According to the described first sensing image data and the described second sensing image data computation purely by the 3rd sensing image data of the light source that described photoflash lamp provides of preflashing;

According to first white balance gains of at least one image channel of the described first sensing image data computation, and second white balance gains of the described image channel of described the 3rd sensing image data computation of foundation;

Described the 3rd sensing image data of foundation are calculated pure the 4th sensing image data by the main light source that described photoflash lamp provides that dodges with the main light modulation ratio value that sparkles;

According to the described first sensing image data and described the 4th sensing image data definition first matrix and second matrix, in order to write down main described photoflash lamp that dodges and described environment light source contribution proportion respectively for each pixel of image in the preview mode;

According to described first white balance gains, described second white balance gains, described first matrix and at least one the 3rd matrix of described second defined matrix, in order to the 3rd white balance gains of the corresponding described image channel of each pixel that writes down image described in the corresponding described preview mode;

Obtain the 4th matrix according to described the 3rd matrix interpolation, in order to write down the Sibai balance of each pixel gain in the image in the corresponding exposal model; And

When taking pictures operation, carry out white balance correction individually for each pixel in the sensing image according to described the 4th matrix.

14. according to claim 13 a described photographic method, wherein said image channel comprises red channel or blue channel.

15. photographic method according to claim 13 also comprises and utilizes bilinear interpolation method to obtain described the 4th matrix according to described the 3rd matrix interpolation.

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