Method of deriving quantization parameter with differential and predicted quantization parameters

Patent metadata

Field	Value
Publication number	US-9204151-B2
Application number	US-201514592809-A
Country	US
Kind code	B2
Filing date	Jan 8, 2015
Priority date	Nov 4, 2011
Publication date	Dec 1, 2015
Grant date	Dec 1, 2015

Abstract

Provided is a method that restores a differential quantization parameter of a current coding unit, generates a quantization parameter predictor of the current coding unit using one or two quantization parameters of a left quantization parameter, an above quantization parameter and a previous quantization parameter and generates a quantization parameter of the current coding unit using the differential quantization parameter and the quantization parameter predictor, wherein a minimum size of quantization unit is adjusted per picture. Therefore, the complexity of the encoding and decoding apparatus is reduced by adjusting the minimum size of the quantization unit. Also, coding efficiency is improved by encoding the quantization parameter using neighboring quantization parameters and by signaling the minimum size of the quantization unit per picture.

First claim

The invention claimed is:

1. A method of inversely quantizing a quantized block, the method comprising:
restoring a differential quantization parameter;
generating a quantization parameter predictor;
generating a quantization parameter using the differential quantization parameter and the quantization parameter predictor; and
inversely quantizing the quantized block using the quantization parameter and a quantization matrix,
wherein the differential quantization paramete…

Assignees

• Infobridge Pte Ltd

Inventors

• Oh Soo Mi
• Yang Moonock

Classifications

• H04N19/11 Primary

  Electricity · mapped topic

• H04N19/593

  Electricity · mapped topic

• H04N19/61

  Electricity · mapped topic

• H04N19/176

  Electricity · mapped topic

• H04N19/157

  Electricity · mapped topic