Video decoding device and method using inverse quantization
AssigneeNEC Corporation
InventorsHirofumi Aoki, Keiichi Chono, Yuzo Senda, Kenta Senzaki
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Abstract
In a video decoding device, a quantization step size decoding unit calculates a quantization step size that controls a granularity of the inverse quantization by, based on an image prediction, selectively using a mean value of at least a quantization step size assigned to a leftwardly adjacent neighboring image block already decoded and a quantization step size assigned to a upwardly adjacent neighboring image block already decoded or a quantization step size assigned to an image block decoded immediately before.
Claims3
A video decoding device for decoding image blocks based on inverse quantization of input compressed video data to execute a process of generating image data as a set of the image blocks, comprising
- quantization step size decoding unit which decodes a quantization step size that controls a granularity of the inverse quantization,
- wherein the quantization step size decoding unit calculates the quantization step size that controls the granularity of the inverse quantization by, based on an image prediction parameter, selectively using a mean value of at least a quantization step size assigned to a leftwardly adjacent neighboring image block already decoded and a quantization step size assigned to an upwardly adjacent neighboring image block already decoded or a quantization step size assigned to an image block decoded immediately before.
A video decoding method for decoding image blocks using inverse quantization of input compressed video data to execute a process of generating image data as a set of the image blocks, comprising
- calculating a quantization step size that controls a granularity of the inverse quantization by, based on an image prediction parameter, selectively using a mean value of at least a quantization step size assigned to a leftwardly adjacent neighboring image block already decoded and a quantization step size assigned to an upwardly adjacent neighboring image block already decoded or a quantization step size assigned to an image block decoded immediately before.
A non-transitory computer readable information recording medium storing a video decoding program for decoding image blocks based on inverse quantization of input compressed video data to execute a process of generating image data as a set of the image blocks, when executed by a processor, the program performs a method for
- calculating a quantization step size that controls a granularity of the inverse quantization by, based on an image prediction parameter, selectively using a mean value of at least a quantization step size assigned to a leftwardly adjacent neighboring image block already decoded and a quantization step size assigned to an upwardly adjacent neighboring image block already decoded or a quantization step size assigned to an image block decoded immediately before.
Dependencies are inferred from the claim text.