Patent ID: 8139155

Claim:
An image processing device, comprising: a dynamic estimating unit, for estimating a dynamic motion degree of a video composite signal, so as to output a motion factor, wherein the motion factor has a respective value for each pixel at the same location of a plurality of successive frames; a first low pass filter, for receiving a chrominance signal and performing a low pass filtering to generate a first filtered signal, wherein the chrominance signal represents a chrominance component of the video composite signal after a luminance/chrominance separation and a demodulation, wherein the first low pass filter comprises: a first re-sampler, for re-sampling the chrominance signal, so as to obtain a plurality of sampling results; a plurality of first addition units, for respectively summing up a part of the plurality of sampling results obtained from the first re-sampler; a plurality of first multiplication units, for receiving summing results of the first addition units to generate a plurality of multiplying results; and a second addition unit, for summing up the multiplying results of the first multiplication units to generate the first filtered signal; a second low pass filter, for receiving the chrominance signal and performing a low pass filtering to generate a second filtered signal, wherein a bandwidth of the first low pass filter is different from that of the second low pass filter; and a weighting unit, for weighting the first filtered signal and the second filtered signal according to the motion factor, so as to determine how much high frequency component of the chrominance signal is reserved.