技术领域technical field
本发明涉及光学系统技术领域，更具体地，涉及一种测试镜头视场角的系统及方法。The present invention relates to the technical field of optical systems, and more particularly, to a system and method for testing the viewing angle of a lens.
背景技术Background technique
在测试光学镜头的视场角时，通常采用直尺和半圆仪等工具。但这只能对有关数据进行大致地测量，测得精度较低。尤其针对广角(视场角大于180度)的镜头，需要拼接测量，因而测得精度就更加受到限制。When testing the field of view of an optical lens, tools such as a ruler and a semicircle are usually used. But this can only roughly measure the relevant data, and the measurement accuracy is low. Especially for wide-angle lenses (field of view greater than 180 degrees), splicing measurement is required, so the measurement accuracy is even more limited.
发明内容Contents of the invention
本发明的目的在于克服现有技术存在的上述缺陷，提供一种测试镜头视场角的系统及方法。The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and provide a system and method for testing the field of view of a lens.
为实现上述目的，本发明的技术方案如下：To achieve the above object, the technical scheme of the present invention is as follows:
一种测试镜头视场角的系统，包括：A system for testing the field of view of a lens, comprising:
直线移动模块，用于带动其装载的待测试镜头水平移动，所述镜头正对移动方向设置；The linear movement module is used to drive the loaded lens to be tested to move horizontally, and the lens is set facing the moving direction;
成像模块，用于通过所述镜头获得观察用成像；An imaging module, configured to obtain imaging for observation through the lens;
标识模块，包括第一点标识至第三点标识，所述第一点标识设于所述镜头的正前方，并位于获得的所述成像的中心，所述第二点标识和所述第三点标识等高对称设于所述镜头正前方的两侧，且所述第二点标识和第三点标识的连线位于所述第一点标识相对于所述镜头移动方向的前侧位置；An identification module, including a first point identification to a third point identification, the first point identification is set directly in front of the lens and located at the center of the obtained imaging, the second point identification and the third point identification The point marks are symmetrically arranged on both sides directly in front of the lens, and the line connecting the second point mark and the third point mark is located at the front side of the first point mark relative to the moving direction of the lens;
其中，当所述镜头向所述第一点标识方向移动至所述第二点标识和所述第三点标识在所述成像中变动到正好处于左右边缘的终点位置时，根据所述终点位置与所述第二点标识和所述第三点标识连线之间的距离，以及所述第二点标识和所述第三点标识连线的长度，确定所述终点位置分别与所述第二点标识和所述第三点标识的连线之间的夹角，得到所述镜头的视场角。Wherein, when the lens moves to the direction of the first point mark until the end position of the second point mark and the third point mark in the imaging changes to just the left and right edges, according to the end position The distance between the second point mark and the third point mark line, and the length of the second point mark and the third point mark line are used to determine the distance between the terminal position and the first point mark. The included angle between the line marked by the second point and the line marked by the third point obtains the field of view angle of the lens.
进一步地，所述直线移动模块为一电缸，所述电缸设有相配合的导轨和滑块，所述镜头设于所述滑块上。Further, the linear movement module is an electric cylinder, and the electric cylinder is provided with a matching guide rail and a slider, and the lens is arranged on the slider.
进一步地，所述镜头通过一高度可调式夹具装载于所述滑块上。Further, the lens is loaded on the slider through a height-adjustable clamp.
进一步地，所述导轨上沿移动方向设有标尺。Further, a scale is provided on the guide rail along the moving direction.
进一步地，所述成像模块为一包括所述镜头在内的相机。Further, the imaging module is a camera including the lens.
进一步地，所述第二点标识和所述第三点标识之间的距离固定。Further, the distance between the second point mark and the third point mark is fixed.
进一步地，所述标识模块还包括第一竖尺至第三竖尺，所述第一点标识至第三点标识分别设于所述第一竖尺至第三竖尺上。Further, the identification module further includes a first vertical ruler to a third vertical ruler, and the first to third point markers are respectively provided on the first to third vertical rulers.
进一步地，所述标识模块还包括两个相交成一定夹角的平板，所述第二点标识和所述第三点标识分设于两个所述平板的外侧位置上，所述第一点标识设于两个所述平板的竖直交线位置上。Further, the identification module also includes two flat plates that intersect to form a certain angle, the second point mark and the third point mark are respectively arranged on the outer positions of the two plates, and the first point mark It is arranged at the vertical intersection of the two flat panels.
一种测试镜头视场角的方法，使用上述的测试镜头视场角的系统，包括以下步骤：A method for testing the field of view of a lens, using the above-mentioned system for testing the field of view of a lens, comprising the following steps:
设定第二点标识和第三点标识的连线长度，以及所述连线与静止状态的待测试镜头之间的距离；Set the length of the connection line between the second point mark and the third point mark, and the distance between the connection line and the lens to be tested in a static state;
通过所述镜头，获取对第一点标识至第三点标识的成像；Obtain images of the first point mark to the third point mark through the lens;
调整使所述第一点标识在所述成像中处于中心位置，以校正镜头中心；adjusting so that the first point mark is at the center of the imaging, so as to correct the center of the lens;
使所述镜头向第一点标识方向水平移动，直至所述第二点标识和所述第三点标识在所述成像中变动到正好处于左右边缘的移动终点位置，记录所述终点位置与所述连线之间的距离；Make the lens move horizontally in the direction of the first point mark until the second point mark and the third point mark change to the moving end position just at the left and right edges in the imaging, record the end point position and the the distance between the connecting lines;
根据勾股定律，计算所述终点位置分别与所述第二点标识和所述第三点标识的连线之间的夹角，得到所述镜头的视场角。According to the Pythagorean law, the included angles between the terminal position and the line connecting the second point mark and the third point mark are calculated to obtain the field of view angle of the lens.
进一步地，在校正镜头中心之前，先对获取的所述图像进行畸变校正。Further, before correcting the center of the lens, distortion correction is first performed on the acquired image.
本发明能够有效提高测试精度，并节省测试时间。The invention can effectively improve the testing precision and save testing time.
附图说明Description of drawings
图1是本发明一较佳实施例的一种测试镜头视场角的系统结构示意图。FIG. 1 is a schematic structural diagram of a system for testing the field of view of a lens in a preferred embodiment of the present invention.
图2是本发明一较佳实施例的一种测试镜头视场角的方法原理示意图。Fig. 2 is a schematic diagram of the principle of a method for testing the field of view of a lens according to a preferred embodiment of the present invention.
具体实施方式Detailed ways
下面结合附图，对本发明的具体实施方式作进一步的详细说明。The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.
需要说明的是，在下述的具体实施方式中，在详述本发明的实施方式时，为了清楚地表示本发明的结构以便于说明，特对附图中的结构不依照一般比例绘图，并进行了局部放大、变形及简化处理，因此，应避免以此作为对本发明的限定来加以理解。It should be noted that, in the following specific embodiments, when describing the embodiments of the present invention in detail, in order to clearly show the structure of the present invention for the convenience of description, the structures in the drawings are not drawn according to the general scale, and are drawn Partial magnification, deformation and simplification are included, therefore, it should be avoided to be interpreted as a limitation of the present invention.
在以下本发明的具体实施方式中，请参考图1和图2，图1是本发明一较佳实施例的一种测试镜头视场角的系统结构示意图，图2是本发明一较佳实施例的一种测试镜头视场角的方法原理示意图。如图1所示，本发明的一种测试镜头视场角的系统，可包括：直线移动模块，成像模块，标识模块(包括第一点标识a，第二点标识e’和第三点标识f’)等几个主要结构组成部分。In the following specific embodiments of the present invention, please refer to Fig. 1 and Fig. 2, Fig. 1 is a schematic structural diagram of a system for testing the field of view of a lens in a preferred embodiment of the present invention, and Fig. 2 is a preferred implementation of the present invention A schematic diagram of the principle of a method for testing the field of view of a lens. As shown in Fig. 1, a kind of system of testing lens angle of view of the present invention can comprise: linear movement module, imaging module, identification module (comprising first point mark a, second point mark e' and the 3rd point mark f') and other main structural components.
请参考图1。直线移动模块用于带动其上装载的待测试视场角的镜头(图略)水平移动。作为一可选的实施方式，直线移动模块可为一电缸。本发明不限于此。Please refer to Figure 1. The linear movement module is used to drive the lens (not shown) with the field of view to be tested loaded on it to move horizontally. As an optional implementation, the linear movement module may be an electric cylinder. The present invention is not limited thereto.
以电缸为例，电缸设有直线导轨10和与导轨10之间形成滑动配合的滑块(图略)。镜头设于滑块上。Taking the electric cylinder as an example, the electric cylinder is provided with a linear guide rail 10 and a sliding block (not shown) that slides with the guide rail 10 . The lens is set on the slider.
作为一优选的实施方式，镜头可通过一高度可调式夹具11装载于滑块上，以便可以方便地调整镜头的高度，从而能够与第一点标识a的高度相适应。As a preferred embodiment, the lens can be loaded on the slider through a height-adjustable clamp 11, so that the height of the lens can be adjusted conveniently, so as to adapt to the height of the first mark a.
也可以反过来，将镜头固定安装在滑块上，而通过调整第一点标识a的高度，来与镜头的高度相适应。Alternatively, the lens can be fixedly installed on the slider, and the height of the mark a at the first point can be adjusted to adapt to the height of the lens.
为了测量镜头与第二点标识e’和第三点标识f’连线e’f’(图示线段e’f’)之间的垂直距离，可在导轨10上沿移动方向设置具有一定精度的标尺101(图中下方虚拟显示了该标尺101，单位例如为米，可精确到毫米)。同时，在第二点标识e’和第三点标识f’正下方一定高度的投影位置上，还可以在第二点标识e’和第三点标识f’的两个投影点e和f之间设置另一个标尺(如图2中下方显示的横向标尺，单位例如为米，可精确到毫米)，并使得上述两个标尺保持正交。从而可以直观地了解镜头与第二点标识e’和第三点标识f’连线e’f’之间的垂直距离，以及第二点标识e’和第三点标识f’连线e’f’的长度(第二点标识e’和第三点标识f’的距离)。其中，第二点标识e’和第三点标识f’的距离是可以根据其与镜头初始位置之间的距离进行预先设定的，即第二点标识e’和第三点标识f’的距离是固定已知的。In order to measure the vertical distance between the lens and the line e'f' connecting the second point mark e' and the third point mark f' (the line segment e'f' in the figure), a certain accuracy can be set on the guide rail 10 along the moving direction. The ruler 101 (the ruler 101 is virtually shown at the bottom of the figure, and the unit is, for example, meters, which can be accurate to millimeters). At the same time, at the projection position at a certain height directly below the second point mark e' and the third point mark f', it is also possible to place the second point mark e' and the third point mark f' between the two projected points e and f Set another scale between them (the horizontal scale shown at the bottom of Figure 2, the unit is, for example, meter, and can be accurate to mm), and keep the above two scales orthogonal. In this way, we can intuitively understand the vertical distance between the lens and the line e'f' between the second point mark e' and the third point mark f', as well as the line e' between the second point mark e' and the third point mark f' The length of f' (the distance between the second point marking e' and the third point marking f'). Wherein, the distance between the second point mark e' and the third point mark f' can be preset according to the distance between it and the initial position of the lens, that is, the distance between the second point mark e' and the third point mark f' The distance is fixed and known.
镜头在导轨10上正对着其移动的方向进行设置，即镜头面对第一点标识a布置。The lens is set on the guide rail 10 facing its moving direction, that is, the lens is arranged facing the first point mark a.
成像模块用于通过镜头获得对第一点标识至第三点标识a、e’、f’的观察用成像。作为一可选的实施方式，成像模块可为一个包括镜头在内的相机，通过对第一点标识至第三点标识a、e’、f’进行成像，即可在相机上得到针对第一点标识至第三点标识a、e’、f’的图像。因而，本发明的系统可以用于对各类相机上配置的镜头的视场角进行测试。The imaging module is used to obtain imaging for observation of the first point mark to the third point mark a, e', f' through the lens. As an optional implementation, the imaging module can be a camera including a lens. By imaging the first to third point marks a, e', f', the first Point ID to third point identify images of a, e', f'. Therefore, the system of the present invention can be used to test the field angles of lenses configured on various cameras.
在相机上得到的针对第一点标识第三点标识a、e’、f’的图像(成像)，在镜头朝向第一点标识a方向移动时，是呈动态变化的。因为第二点标识e’和第三点标识f’将不断变化其在成像中的位置，具体是由相对位于成像图像的中部，逐渐向两侧的边缘位置移动。The image (imaging) obtained on the camera for the first point marking and the third point marking a, e', f' is dynamically changing when the lens moves towards the direction of the first point marking a. Because the second point mark e' and the third point mark f' will constantly change their positions in the imaging, specifically, they are relatively located in the middle of the imaging image and gradually move to the edge positions on both sides.
请参考图1并结合参考图2。标识模块包括第一点标识a，第二点标识e’和第三点标识f’等。其中，第一点标识a设于镜头的正前方，并位于获得的成像的中心，即第一点标识a设于相对于镜头中心的位置。换言之，是通过第一点标识a来校正镜头的中心。Please refer to Figure 1 in conjunction with Figure 2. The identification module includes the first point identification a, the second point identification e' and the third point identification f' and so on. Wherein, the first point mark a is set directly in front of the lens, and is located at the center of the obtained image, that is, the first point mark a is set at a position relative to the center of the lens. In other words, the center of the lens is corrected by the first point marked a.
第二点标识e’和第三点标识f’与第一点标识a的高度相等，且第二点标识e’和第三点标识f’对称位于第一点标识a的前侧。即以镜头移动方向为参照，第一点标识a位于第二点标识e’和第三点标识f’的后侧位置。The height of the second mark e' and the third mark f' is equal to that of the first mark a, and the second mark e' and the third mark f' are located symmetrically on the front side of the first mark a. That is, taking the lens moving direction as a reference, the first point mark a is located behind the second point mark e' and the third point mark f'.
当第二点标识e’和第三点标识f’之间的距离(线段e’f’)确定后，第一点标识a与第二点标识e’和第三点标识f’连线e’f’之间的距离远近(或者图示第一点标识a和第二点标识e’的连线ae’与第一点标识a和第三点标识f’的连线af’之间的夹角γ大小)，即决定可以支持镜头的视场角ω的大小。其中，第一点标识a与第二点标识e’和第三点标识f’连线e’f’之间的距离越远(或者第一点标识a和第二点标识e’的连线ae’与第一点标识a和第三点标识f’的连线af’之间的夹角γ越小)，系统可以支持测试的镜头的视场角ω就越大。When the distance (line segment e'f') between the second point mark e' and the third point mark f' is determined, the first point mark a and the second point mark e' and the third point mark f' connect the line e The distance between 'f' (or the connection line ae' between the first point mark a and the second point mark e' and the line af' between the first point mark a and the third point mark f' in the diagram The size of the included angle γ), which determines the size of the field of view ω that can support the lens. Wherein, the farther the distance between the line e'f' between the first point mark a and the second point mark e' and the third point mark f' is (or the line connecting the first point mark a and the second point mark e' The smaller the angle γ between ae' and the line af' connecting the first point a and the third point f', the larger the field of view ω of the lens that the system can support for testing.
当驱动导轨10上安装的镜头向第一点标识a方向移动时，第二点标识e’和第三点标识f’将不断变化其在成像中的位置，由相对位于成像图像的中部，逐渐向两侧的边缘位置移动。When the lens installed on the driving guide rail 10 moves to the direction of the first point mark a, the second point mark e' and the third point mark f' will constantly change their positions in imaging, from being relatively located in the middle of the imaging image, gradually Move toward the edges on both sides.
当第二点标识e’和第三点标识f’在成像中变动到正好处于左右边缘的终点位置时，可根据终点位置b(b’)与第二点标识e’和第三点标识f’连线e’f’之间的距离(即图中线段bc的长度)，以及第二点标识e’和第三点标识f’连线e’f’的长度，来确定终点位置b’和第二点标识e’的连线b’e’与终点位置b’和第三点标识f’的连线b’f’之间的夹角ω(θ)，从而得到镜头的视场角ω。图中角θ与视场角ω相等，即角θ是视场角ω的垂直投影角。When the second point mark e' and the third point mark f' change to the end position just at the left and right edges during imaging, according to the end position b(b') and the second point mark e' and the third point mark f The distance between the 'connection e'f' (that is, the length of the line segment bc in the figure), and the length of the second point identification e' and the third point identification f' connection line e'f' to determine the end position b' The included angle ω(θ) between the line b'e' of the second point mark e' and the line b'f' of the end position b' and the third point mark f', thus obtaining the field of view angle of the lens omega. In the figure, the angle θ is equal to the angle of view ω, that is, the angle θ is the vertical projection angle of the angle of view ω.
请参考图1。作为一可选的实施方式，可将第二点标识e’和第三点标识f’分设于两个平板12和13上；并将两个平板12、13相交成一定夹角γ，使第二点标识e’和第三点标识f’分别位于两个相交平板12、13的外侧位置上，例如位于两个相交平板12、13的外侧边缘上。同时，可将第一点标识a设于两个平板12、13的交线位置上，例如位于两个相交平板12、13的内侧接缝处，即第一点标识a理论上处于为两个平板12、13所共享的交线位置。Please refer to Figure 1. As an optional implementation, the second point mark e' and the third point mark f' can be separately arranged on the two flat plates 12 and 13; and the two flat plates 12, 13 intersect to form a certain angle γ, so that the The second mark e' and the third point mark f' are located on the outer positions of the two intersecting flat plates 12, 13, for example, on the outer edges of the two intersecting flat plates 12, 13. At the same time, the first point mark a can be set at the position of the intersection line of the two flat plates 12, 13, for example, at the inner seam of the two intersecting plates 12, 13, that is, the first point mark a is theoretically located at two The intersection line shared by the plates 12, 13.
第一点标识至第三点标识a、e’、f’和两个相交平板12、13共同组成了标识模块的主要结构。The first to third point marks a, e', f' and the two intersecting plates 12, 13 together constitute the main structure of the mark module.
第一点标识至第三点标识a、e’、f’可以通过刻印方式制作在两个平板12、13上；或者，第一点标识至第三点标识a、e’、f’可以通过粘贴方式形成在两个平板12、13上；或者，第一点标识至第三点标识a、e’、f’还可以采用激光照射在两个平板12、13上。等等。即第一点标识a，第二点标识e’，第三点标识f’的中心点分别为图示的点a，e’，f’。The first point mark to the third point mark a, e', f' can be made on the two flat plates 12, 13 by engraving; or, the first point mark to the third point mark a, e', f' can be made by The sticking method is formed on the two flat plates 12, 13; or, the first to third point marks a, e', f' can also be irradiated on the two flat plates 12, 13 by laser light. and many more. That is, the center points of the first point marked a, the second point marked e', and the third point marked f' are the points a, e', and f' shown in the figure respectively.
上述两个平板12、13可采用任意适用的形状，只须保证第一点标识至第三点标识a、e’、f’在其上的相对位置即可。其中，图示两个矩形平板12、13的底边长度可以是任意的长度，但将其长度设置得较长时，精度将会更高。The above-mentioned two flat plates 12, 13 can adopt any applicable shape, as long as the relative positions of the first to third point marks a, e', f' on them are guaranteed. Wherein, the lengths of the bases of the two rectangular plates 12 and 13 shown in the figure can be any length, but if the lengths are set longer, the accuracy will be higher.
作为其他可选的实施方式，也可将第一点标识a设于一个第一竖尺上，将第二点标识e’设于一个第二竖尺上，将第三点标识f’设于一个第三竖尺上。第一竖尺至第三竖尺面对镜头垂直设置，并相互平行。As other optional implementations, the first point mark a can also be set on a first vertical ruler, the second point mark e' can be set on a second vertical rule, and the third point mark f' can be set on a on a third vertical foot. The first vertical ruler to the third vertical ruler are vertically arranged facing the lens and are parallel to each other.
第一点标识至第三点标识a、e’、f’和第一竖尺至第三竖尺共同组成了标识模块的主要结构。The first to third point marks a, e', f' and the first vertical ruler to the third vertical ruler together form the main structure of the marking module.
下面通过具体实施方式及附图，对本发明的测试镜头视场角的方法进行详细说明。The method for testing the field of view of a lens according to the present invention will be described in detail below through specific embodiments and accompanying drawings.
请参考图2并结合参考图1。本发明的一种测试镜头视场角的方法，可使用上述的测试镜头视场角的系统。Please refer to Figure 2 in conjunction with Figure 1. A method for testing the field of view of a lens according to the present invention can use the above-mentioned system for testing the field of view of a lens.
如图1所示，角ω即为所需求解的镜头视场角，其与角θ是相等的。在移动镜头时，当镜头移动到超过ef两点构成的直线时，说明镜头的视场角是大于180度的广角镜头。As shown in Figure 1, the angle ω is the angle of view of the lens to be solved, which is equal to the angle θ. When moving the lens, when the lens moves beyond the line formed by the two points ef, it means that the field of view of the lens is a wide-angle lens greater than 180 degrees.
如图2所示，方法可包括以下步骤：As shown in Figure 2, the method may include the following steps:
首先，设定好第二点标识e’和第三点标识f’的连线e’f’长度，以及连线e’f’与静止状态(初始状态)的待测试镜头之间的距离。可在例如上述的两个相交平板12、13的交线上标明用于校正镜头中心的第一点标识a，以及在两个相交平板12、13的边缘位置上标明用于测试视场角ω大小的第二点标识e’和第三点标识f’。First, set the length of the line e'f' between the second point mark e' and the third point mark f', and the distance between the line e'f' and the lens to be tested in the static state (initial state). For example, the first point mark a for correcting the lens center can be marked on the intersection line of the above-mentioned two intersecting plates 12, 13, and can be marked on the edge position of the two intersecting plates 12, 13 for testing the angle of view ω The second point of size identifies e' and the third point identifies f'.
然后，可在相机上通过镜头获取对第一点标识至第三点标识a、e’、f’的成像。Then, the images of the first to third point marks a, e', f' can be captured on the camera through the lens.
接着，可先对获取的图像进行畸变校正，以保证测量精度。畸变校正可采用业内相应的算法执行。Next, distortion correction can be performed on the acquired image first to ensure measurement accuracy. Distortion correction can be performed using corresponding algorithms in the industry.
然后，调整使第一点标识a在成像中处于中心位置，以校正镜头中心。Then, adjust so that the first point mark a is in the center of the imaging, so as to correct the center of the lens.
接下来，即可进行测试。使镜头慢慢向第一点标识a方向水平移动，同时对相机中出现的成像进行观察。Next, it's time to test. Slowly move the lens horizontally in the direction marked by the first point a, and at the same time observe the imaging that appears in the camera.
当第二点标识e’和第三点标识f’在摄像头的成像中变动到正好处于左右边缘的视野范围内时，停止对镜头的移动，并将该位置标记为终点位置b(b’)。此时，可根据导轨10上的刻度，记录终点位置b与连线ef之间的垂直距离(或点b’与线段e’f’之间的垂直距离)，即点b与点c之间的距离，也就是图中线段bc所代表的长度。When the second point mark e' and the third point mark f' change to just within the field of view of the left and right edges in the imaging of the camera, stop moving the lens, and mark this position as the end position b(b') . At this time, according to the scale on the guide rail 10, the vertical distance between the end position b and the line ef (or the vertical distance between point b' and line segment e'f') can be recorded, that is, the distance between point b and point c The distance, that is, the length represented by the line segment bc in the figure.
之后，可根据勾股定律，计算终点位置b’和第二点标识e’连线b’e’与终点位置b’和第三点标识f’连线b’f’之间的夹角ω，从而得到镜头的视场角ω。Afterwards, according to the Pythagorean law, the angle ω between the line b'e' between the end position b' and the second point mark e' and the line b'f' between the end position b' and the third point mark f' can be calculated , so as to obtain the field of view ω of the lens.
下面将视场角ω使用FOV代替，计算方法具体如下：In the following, the field of view ω is replaced by FOV, and the calculation method is as follows:
(1)当FOV＜180°时，例如镜头移动到图2中位于ef这条直线上方一侧的b点，使用以下公式测得视场角：(1) When FOV<180°, for example, the lens moves to point b on the side above the line ef in Figure 2, and the field of view angle is measured using the following formula:
tanα＝ec/bctanα=ec/bc
FOV＝2αFOV=2α
此时测得的镜头视场角约为90度。The measured field angle of the lens at this time is about 90 degrees.
(2)当FOV＝180°时，即当镜头刚好停留在ef这条直线上的c点时，视场角即为180°；(2) When FOV=180°, that is, when the lens just stops at point c on the line ef, the field of view is 180°;
(3)当FOV＞180°时，镜头将移动到ef这条直线的另一侧，例如位于图示的g点，则使用以下公式测得视场角：(3) When FOV>180°, the lens will move to the other side of the line ef, for example, at point g in the figure, then use the following formula to measure the field of view angle:
tanβ＝ec/gctanβ=ec/gc
FOV＝360°-2βFOV＝360°-2β
此时测得的镜头视场角约为213.4度。The measured field angle of the lens at this time is about 213.4 degrees.
利用本发明的上述系统及方法，能够有效提高测试镜头视场角时的精度，并节省测试时间。The system and method of the present invention can effectively improve the accuracy of testing the field angle of the lens and save testing time.
以上的仅为本发明的优选实施例，实施例并非用以限制本发明的保护范围，因此凡是运用本发明的说明书及附图内容所作的等同结构变化，同理均应包含在本发明的保护范围内。The above are only preferred embodiments of the present invention, and the embodiments are not intended to limit the protection scope of the present invention. Therefore, all equivalent structural changes made by using the description and accompanying drawings of the present invention should be included in the protection of the present invention in the same way. within range.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910662020.8ACN110426183B (en) | 2019-07-22 | 2019-07-22 | System and method for testing field angle of lens |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910662020.8ACN110426183B (en) | 2019-07-22 | 2019-07-22 | System and method for testing field angle of lens |
| Publication Number | Publication Date |
|---|---|
| CN110426183Atrue CN110426183A (en) | 2019-11-08 |
| CN110426183B CN110426183B (en) | 2021-05-18 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910662020.8AActiveCN110426183B (en) | 2019-07-22 | 2019-07-22 | System and method for testing field angle of lens |
| Country | Link |
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| CN (1) | CN110426183B (en) |
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