Picture for testing shooting die set and method thereof

Abstract

The invention provides a picture for testing shooting die set. The picture is quadrate and comprises a white squares which have the same size and are distributed at intervals; one white square is positioned in the center of the picture, and other white squares are uniformly arranged around the center of the picture; each white square is surrounded with a black area. According to the picture, the shooting die set is used for shooting the image to obtain an image; a plurality of selecting square frames are selected for the image; two ends of each sampling square frame are positioned in the black area, and the middle is positioned in the white square, so that the plurality of sampling square frames are the black-white-black graphics; the MTF value of pixel points in the sampling square frames can be calculated according to the black-white-black graphics; if the MTF value is close to 1, the performance of the tested shooting die set is high; the central area of the picture can be selected through the sampling square frame; the selected sampling square frames are not purely white and can be used for sampling determining, so that the evaluation accuracy of the whole image quality can be improved. The invention further provides a method for testing the shooting die set.

Description

technical field [0001] The invention relates to the technical field of testing camera modules, in particular to a picture for testing camera modules and a method thereof. Background technique [0002] When testing the camera module (Compact Camera Module, CCM), it is generally carried out in the light box. A test chart is pasted on the top of the light box, and the CCM is placed in the jig on the desktop at the bottom of the light box. The desktop and the chart are required To maintain parallelism, the image acquisition device of the CCM captures charts in a specific bright environment, and transmits the collected image data to the test software. The test software analyzes the collected image information, processes it through a specific algorithm, and judges whether the resolution of the CCM is good or not. Since the resolution is different in different positions where the CCM shoots the image, it is usually necessary to select different areas (such as the center and four si...

AI Technical Summary

Problems solved by technology

[0004] but figure 1 In the chart in , if the sampling box is selected in the center of the image, the sampling box will be all white, and this sampling box cannot be used for sampling judgment, so it is easy to cause inaccurate evaluation of the overall image quality

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