Method and device for detecting lens center
A technology for detecting the lens and the center of the lens, which is applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problems of low detection accuracy, large calculation amount, and increased error, and achieve the effect of improving detection efficiency and high accuracy
Active Publication Date: 2020-05-12
GOERTEK OPTICAL TECH CO LTD
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[0003] The existing main method for detecting the center of the lens is Hough circle detection. Since the Hough circle detection is based on the voting algorithm, and the error will increase when the radius of the image area is relatively large, even if the imaging area of the image is a relatively sharp Circle, using Hough circle detection will also detect countless circles, the detection accuracy is low
[0004] Another commonly used detection method is to use the equation of the circle to group the contour points of the imaging area into the equation of the circle, and use the equation of the circle to obtain the position of the center of the circle. This detection method requires a large amount of calculation, which leads to low detection efficiency Low
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[0076] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
[0077] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.
[0078] Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.
[0079] In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have dif...
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The invention discloses a method and device for detecting a lens center. The method comprises the following steps: acquiring an image shot by a lens module; determining the minimum brightness value of a round imaging area in the image; taking the minimum brightness value as a threshold value, and carrying out binarization processing on the image; carrying out scanning line by line on the image subjected to the binarization processing, and calculating an abscissa value of a midpoint on every line in the imaging area to obtain an abscissa sequence; carrying out scanning column by column on the image subjected to the binarization processing, and calculating an ordinate value of the midpoint on every column to obtain an ordinate sequence; and determining the position coordinates of the lens center in the coordinate system of a sensor according to the abscissa sequence and the ordinate sequence.
Description
technical field [0001] The invention relates to the field of lens module detection, and more specifically, the invention relates to a method for detecting the center of a lens and a device for detecting the center of the lens. Background technique [0002] In the optical detection of the lens module, the most basic detection is the detection of the lens center, that is, to detect whether the deviation between the lens center and the optical sensor center is within the required range. If the detection is qualified, further detection can be carried out, for example The white balance calibration of the lens, the resolution test of the lens, etc., otherwise the detection results of further detection will be meaningless. [0003] The existing main method for detecting the center of the lens is Hough circle detection. Since the Hough circle detection is based on the voting algorithm, and the error will increase when the radius of the image area is relatively large, even if the ima...
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IPC IPC(8): G01B11/00
CPCG01B11/002
Inventor 盖增园王仲楼高强
Owner GOERTEK OPTICAL TECH CO LTD