Method and apparatus for detection of chromatic aberration

摘要

Method and apparatus for analysing an image to determine the presence of chromatic aberration comprising: applying an edge mask to the image to produce a colour edge image; producing a histogram of the hues in the colour edge image and a histogram of the hues in the original image; determining a mean ratio of the two histograms in a range of hues; and asserting the presence of chromatic aberration if the mean ratio is above a threshold. The mean ratio may be found by determining a ratio at each hue in the range and then calculating the mean of these ratios. The range of hues may comprise pink hues. Edge detection may be carried out by applying a Sobel filter to the luminance component of a YUV image. The centre of the image may be masked, or a pixels contribution to the histograms may be weighted based on its distance from the centre, to improve the detection of transverse chromatic aberration.