METHOD OF PROCESSING A VIDEO SIGNAL USING QUANTIZATION STEP SIZES DYNAMICALLY BASED ON NORMAL FLOW

摘要

There is described a method of processing a video input signal (50) in a data processor (20) to generate corresponding processed output data (40, 200). The method includes steps of: (a) receiving the video input signal (50) at the data processor (20), the input signal (50) including a sequence of images (100) wherein said images (100) are each represented by pixels; (b) grouping the pixels to generate several groups of pixels per image; (c) transforming the groups to corresponding representative transform parameters; (d) coding the transform parameters of the groups to generate corresponding quantized transform data; (e) processing the quantized transform data to generate the processed output data (40, 200) representative of the input signal. The method involves coding the transform parameters in step (d) using quantization step sizes which are dynamically variable as a function of spatio-temporal information conveyed in the sequence of images (100). The method enhances image quality in images regenerated from the output data (40, 200).