Correction method based on multi-distance auto focusing

Abstract

The invention discloses a correction method based on multi-distance auto focusing. Through a mode of combining coarse adjustment and fine adjustment, large and small step sampling is carried out, curve fitting is carried out, the clearest position is searched, a depth of field table of a lens is used and the clearest position in the current test distance is combined to position coarse adjustment positions in other test distances, high-frame rate small-pixel parameters are adopted, central area interception is carried out on a full-size image, the correction precision is improved, the correction time for a single distance is shortened, multi-distance test is realized, and the production efficiency of products can be effectively enhanced.

Description

technical field [0001] The invention relates to the field of automatic focus correction of camera modules, in particular to a correction method based on multi-distance automatic focus, which can realize multi-distance testing and effectively improve the production efficiency of products. Background technique [0002] With the continuous improvement of the pixels of mobile phone camera modules, the focus sensitivity of the camera module has been increased accordingly, resulting in a continuous decline in the efficiency and effect of manual focus. The efficiency of focusing, but with the continuous development and progress of technology, the current camera module has higher and higher requirements for the speed and accuracy of focusing. Since the principle of auto focus is to make the image clear by automatically moving the camera, therefore, in When performing autofocus, it usually takes about 1 second to shoot a clear scene. During the focusing process, the search for clear ...

AI Technical Summary

Problems solved by technology

[0002] With the continuous improvement of the pixels of mobile phone camera modules, the focus sensitivity of the camera module has been increased accordingly, resulting in a continuous decline in the efficiency and effect of manual focus. The efficiency of focusing, but with the continuous development and progress of technology, the current camera module has higher and higher requirements for the speed and accuracy of focusing. Since the principle of auto focus is to make the image clear by automatically moving the camera, therefore, in When performing autofocus, it usually takes about 1 second to shoot a clear scene. During the focusing process, the search for clear points is slow, and the time is mainly wasted in searching for clear points, so the focus speed is slow

[0003] In addition, the current production efficiency of key posts for Auto Focus (AF) calibration is generally low, and the existing calibration algorithms are difficult to meet the specifications for products that require high AF code calibration accuracy. The number of modules required by the customer, and due to the limitations of the existing algorithm and the limited test distance, cannot meet the customer's diverse supply requirements

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