Loop filtering method and loop filter
A loop filter and filter technology, applied in the field of video coding, can solve problems such as unsuitable structures, and achieve the effect of improving subjective image quality and obvious subjective image quality
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[0023] In order to describe the steps of the loop filtering method and the structure of the loop filter more clearly, the position and function of the loop filter in the entire encoder are explained first.
[0024] Such as figure 1 As shown, a video signal is input to the subtractor 100, the first switch 105 and the predictive encoder 145. The subtractor 100 subtracts the forward prediction value (ie, the motion estimation error signal) from the input video signal to obtain a prediction error, and provides the prediction error to the first switch. The first switch 105 selects the input signal according to the encoding controller 120, which is either a prediction error or an original video signal. The output of the first switch enters the discrete cosine transformer 110 (DCT), and the DCT is responsible for performing discrete cosine transform on the signal, which is the most widely used coding method in image coding. The discrete cosine transformed signal is quantized in the...
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