Focus accuracy quantifying judgment device and method

Abstract

The invention relates to a focus accuracy quantifying judgment device and method. The method comprises the steps of (1) obtaining a focus card image arranged in a framing area of an image acquisition device through the image acquisition device; (2) processing the focus card image to remove outside interference and obtain the uniformly exposed focus card image; (3) obtaining acutance information of the obtained uniformly exposed focus card image, and judging whether the image acquisition device is accurate in focusing according to the acutance information. By means of the quantifying judgment method, focusing quality can be objectively evaluated so that focusing can be comprehensively, fast and objectively grasped. The method not only can be used for reference of focus adjustment, but also can be used as criterion for judging whether focusing 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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