Method and device for detecting chromatic aberration in imaging device

Abstract

The present invention is to provide a chromatic aberration detection method and a chromatic aberration detection device; the chromatic aberration of a whole picture can be detected precisely according to the image data output by a pick-up element. As a solution measure, a test pattern which has the alternate first pick-up pattern and second pick-up pattern with different brightness in parallel isshot; in S411, detecting the crossing point of the first pick-up pattern and the second pick-up pattern, next, in S412 to S416, detecting the edge positions of the first pick-up pattern and the second pick-up pattern around the crossing point according to each colour of RGB, and then, in S417, calculating the difference value of the detected edge positions R and B relative to G, and detecting thedifference value as chromatic aberration (delta R, delta B).

Description

technical field [0001] The present invention relates to a chromatic aberration detection method and a chromatic aberration detection device for detecting the chromatic aberration of a lens using an image signal obtained by an imaging element such as a CCD in an imaging device. Background technique [0002] In the past, in imaging devices such as digital cameras, such as Figure 9 As shown in (a), it is known that the imaging deviation on the CCD occurs in each color component of RGB due to the chromatic aberration of magnification of the lens. Furthermore, along with the imaging deviation, color deviation appears in the edge portion of the image, which has the problem of impairing the quality of the image quality. [0003] Therefore, there is an imaging device that detects the amount of chromatic aberration corresponding to the distance from the reference position in the color image based on the color image signal obtained by imaging, and uses the detected amount of chromati...

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Problems solved by technology

[0005] However, according to the conventional method for detecting the amount of chromatic aberration, the amount of aberration in the vertical direction is ignored in the scanning area in the horizontal direction at the center of the screen, and the amount of aberration in the horizontal direction is ignored in the scanning area in the vertical direction at the center of the screen. Therefore, there is room for further improvement in order to increase the detection accuracy of the amount of aberration

That is, in the image area other than the central area, instead of actually scanning the image area to detect the amount of aberration, the amount of aberration in the horizontal direction and the vertical direction of the central area is used to calculate the amount of aberration. Therefore, the actual amount of aberration and the calculated There may be an error between the calculated aberration amounts, and there is room for improvement to eliminate this error

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