# US 10,771,790 B2 · Video decoding device and method using inverse quantization

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- Number: US 10,771,790 B2
- Document ID: US10771790B2
- Status: Granted
- Kind: B2
- Application number: 16/371,161
- Filed: 2019-04-01
- Published: 2019-07-25
- Granted: 2020-09-08
- Earliest claimed: 2011-03-09
- Assignees: NEC Corporation
- Applicants: Hirofumi Aoki; Keiichi Chono; Yuzo Senda; Kenta Senzaki
- Inventors: Hirofumi Aoki; Keiichi Chono; Yuzo Senda; Kenta Senzaki
- Web page: https://patentgrep.com/patent/US10771790B2

## CPC

- H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
- H04N 19/124: Quantisation
- H04N 19/157: Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter
- H04N 19/196: being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters (processing of motion vectors H04N19/513)
- H04N 19/593: involving spatial prediction techniques
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## 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.

## Claims

### Claim 1

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.

### Claim 2

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.

### Claim 3

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.