Image processing system and correlated image processing method
A technology of image processing and filtering processing, applied in the direction of luminance and chrominance signal processing circuits, etc., can solve the problems of blurred color boundaries, different filtering results, low image display performance, etc., to achieve the elimination of pan-color effect and the best image quality Effect
Active Publication Date: 2009-05-13
REALTEK SEMICON CORP
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[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 (W1 as shown in Figure 1), since it cannot separate all the chrominance information through filtering, when displaying an image, the performance of the color boundary will be relatively On the other hand, if the selected filter has a wider filtering frequency band (W2 as shown in Figure 1), although all the chrominance information can be separated by filtering, the obtained filtered signal is not only In addition to the chromaticity information contained, it also contains high-frequency information of brightness, so it will cause misjudgment of chromaticity information. This situation is called cross-color effect. Therefore, when displaying an image , although a sharper color boundary can be obtained, the aforementioned flooding effect will cause image distortion, making the display performance of the image low
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[0019] The present invention will be described in detail below with reference to the accompanying drawings.
[0020] Please refer to FIG. 2 , which is a functional block diagram of a first embodiment of an image processing system 200 of the present invention. As shown in FIG. 2 , the image processing system 200 includes a flood detection module 210 and an image processing module 220 . The coupling manner of each component is shown in FIG. 2 , so it will not be repeated; and the function and operation of each component will be described in detail in the following disclosure.
[0021] In this embodiment, the panchromatic detection module 210 includes a two-dimensional bandpass filter 211 and a judgment module 212; please also refer to FIG. 3 here. FIG. 3 is a two-dimensional bandpass filter 211 shown in FIG. 2 A schematic diagram of an embodiment of the filtering frequency band. As shown in FIG. 3 , the two-dimensional bandpass filter 211 performs filtering processing on the s...
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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 through a composite signal. Please refer to FIG. 1 , which is a schematic diagram of a frequency spectrum of a composite signal. As shown in FIG. 1 , the synthesized 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). [...
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IPC IPC(8): H04N9/78
Inventor 熊家豪
Owner REALTEK SEMICON CORP