A quantitative determination device and method for focusing accuracy

Abstract

The invention relates to a method for quantitative determination of focus accuracy. The method includes: 1) acquiring a focus card image placed in its viewing area through an image acquisition device; 2) performing image processing on the focus card image to remove external interference, and obtain A uniformly exposed focus card image; 3) Obtain the sharpness information of the obtained uniformly exposed focus card image, and determine whether the image acquisition device is accurately focused based on the sharpness information. The method of the present invention can objectively evaluate the focus quality, thereby comprehensively, quickly and objectively grasping the focus situation. It can not only be used as a reference for focus adjustment, but also as a basis for judging whether the focus is qualified.

Description

technical field [0001] The invention belongs to the field of image processing, and relates to a quantitative judging device and method for focusing accuracy. Background technique [0002] An image acquisition device containing a fixed-focus lens, usually used to capture images at a fixed distance. For equipment manufacturers, how to ensure the pass rate of products is very important. Usually, in order to reduce maintenance costs and prevent unqualified products from flowing into the market to users, resulting in increased support costs in the later stage, it is necessary to check whether the focus is qualified for each machine that leaves the factory. [0003] At present, the method used by various manufacturers is to place cards marked with various fine lines in the shooting area, and then human eyes can distinguish whether the captured images can be clearly distinguished. The disadvantage of this method is that it relies too much on the subjective factors of the detector...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it relies too much on the subjective factors of the detector, which is more eye-consuming, and can only focus on the local characteristics of the imaging, which is very inconvenient to grasp the overall situation of the imaging

On the other hand, since the judgment of the human eye inevitably has subjective factors, the manual detection method cannot be quantified specifically, and the accuracy of the detection cannot be judged.

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