Vidicon definition detection method based on definition test card
A detection method and resolution technology, applied in image communication, television, electrical components, etc., can solve the problems of poor reliability, time-consuming and labor-intensive detection method of resolution, etc.
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[0041] The present invention will be further described below.
[0042] A camera definition detection method based on a video definition test card, said camera definition detection method comprising the following steps:
[0043] 1) Select cameras with different sharpness levels, take images of the sharpness test card, measure the sharpness function value of the sharpness test card image, and save the corresponding relationship between the sharpness function value and the sharpness level in the database. The calculation process of the degree function value is as follows:
[0044] 1.1) Detect the gradient of the image:
[0045] Detect the gradient in the horizontal and vertical directions: First, let’s introduce the concept of the neighborhood. With the pixel point a(i, j) as the center, the set of four points above, below, left and right of the pixel point is called the pixel point a. Four-neighborhood, the set of four-neighborhood points of pixel a plus four points on the dia...
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