Image processing system and correlated image processing method

Abstract

The invention provides an image processing system which includes: a film color detecting module that is used for detecting a composite signal whether corresponding to a film color area; an image processing module that is coupled with the film color detecting module. The image processing module includes: a comb filter that is used for filtering to the composite signal and generating a first filtered signal; a first and second band-pass filter that is coupled with the comb filter and processes filtering to the first filtered signal for generating a second filtered signal and a third filtered signal, wherein, bandwidth of the second band-pass filter is greater than bandwidth of the first band-pass filter, when the composite signal corresponds to film color area, the image processing module generates output signal according with the second filtered signal, and when the composite signal does not correspond to film color area, the image processing module generates output signal according with the third filtered signal.

Description

technical field [0001] The present invention provides an image processing system and its related image processing method, especially an image processing system for performing luminance and chrominance separation (Y / C separation) and its related image processing method. Background technique [0002] Generally, image data is transmitted via a composite signal, see here figure 1 , figure 1 is a schematic diagram of the frequency spectrum of a composite signal. Such as figure 1 As shown, the composite signal mainly includes luminance information and chrominance information, and the chrominance information is added to the high-frequency signal of the luminance information in a modulated manner. [0003] After receiving the composite signal, the video decoder needs to separate the luminance information and chrominance information carried by the composite signal for subsequent image processing, and such an operation is called luminance-chrominance separation (Y / C separation). ...

AI Technical Summary

Problems solved by technology

[0004] Usually, the operation of Y / C separation is to filter the synthetic signal through a filter to separate the chrominance information from the high-frequency information of the brightness; but the filtering frequency band of different filters will also lead to different filtering results.

For example, if the selected filter has a narrow filter frequency band (such as figure 1 As shown in W1), because it cannot separate all the chroma information through filtering, when displaying images, the performance of the color boundary will be blurred; on the other hand, if the selected filter has a wider filtering frequency band (such as figure 1 As shown in W2), although all the chrominance information can be separated by filtering, the obtained filtered signal not only contains the chrominance information, but also contains high-frequency information of luminance at the same time, so it will cause For the misjudgment of chrominance information, such a situation is called cross-color effect (cross-color effect). Therefore, when displaying an image, although a sharper color boundary can be obtained, the aforementioned cross-color effect will cause the image Distortion, which makes the display performance of the image low

Images