Video image encoding and decoding device using adaptive pseudo random noise injection during planar mode filtering

Patent metadata

Field	Value
Publication number	US-9288485-B2
Application number	US-201113810586-A
Country	US
Kind code	B2
Filing date	Sep 12, 2011
Priority date	Sep 17, 2010
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

When injecting pseudo random noise to an area centered on a block boundary, a video encoding device and a video decoding device prevent injection of pseudo random noise to an area including a reference image for subsequent planar mode filtering, in order to suppress linear artifacts. The video encoding device includes: an inverse quantization unit for inverse-quantizing a quantization index to obtain a quantization representative value; an inverse frequency transform unit for inverse-transforming the quantization representative value obtained by the inverse quantization unit, to obtain a reconstructed image block; and an adaptive distortion removal filter unit for injecting pseudo random noise to an area centered on a boundary of the reconstructed image block, wherein the adaptive distortion removal filter unit does not inject pseudo random noise to an area including a reference image for planar mode filtering.

First claim

The invention claimed is:

1. A video encoding device comprising:
an inverse quantization unit which inverse-quantizes a quantization index to obtain a quantization representative value;
an inverse frequency transform unit which inverse-transforms the quantization representative value obtained by the inverse quantization unit, to obtain a reconstructed image block; and
a noise injection unit which injects pseudo random noise to a noise injection area when planar mode filtering occurs and wherein the noise injection area is centered on a boundary of the reconstructed image block and excludes a basic image area.

2. A video decoding device comprising:
an inverse quantization unit which inverse-quantizes a quantization index to obtain a quantization representative value;
an inverse frequency transform unit which inverse-transforms the quantization representative value obtained by the inverse quantization unit, to obtain a reconstructed image block; and
a noise injection unit which injects pseudo random noise to a noise injection area when planar mode filtering occurs and wherein the noise injection area is centered on a boundary of the reconstructed image block and excludes a basic image area.

3. A video encoding method comprising:
inverse-quantizing a quantization index to obtain a quantization representative value;
inverse-transforming the obtained quantization representative value to obtain a reconstructed image block; and
injecting pseudo random noise to a noise injection area when planar mode filtering occurs, wherein the noise injection area is centered on a boundary of the reconstructed image block and excludes a basic image area.

4. A video decoding method comprising:
inverse-quantizing a quantization index to obtain a quantization representative value;
inverse-transforming the obtained quantization representative value to obtain a reconstructed image block; and
injecting pseudo random noise to a noise injection area when planar mode filtering occurs, wherein the noise injection area is centered on a boundary of the reconstructed image block and excludes a basic image area.

5. A non-transitory computer readable information recording medium storing a video encoding program, when executed by a processor:
inverse-quantizing a quantization index to obtain a quantization representative value;
inverse-transforming the obtained quantization representative value to obtain a reconstructed image block; and
injecting pseudo random noise to a noise injection area when planar mode filtering occurs, wherein the noise injection area is centered on a boundary of the reconstructed image block and excludes a basic image area.

6. A non-transitory computer readable information recording medium storing a video decoding program, when executed by a processor:
inverse-quantizing a quantization index to obtain a quantization representative value;
inverse-transforming the obtained quantization representative value to obtain a reconstructed image block; and
injecting pseudo random noise to a noise injection area when planar mode filtering occurs, wherein the noise injection area is centered on a boundary of the reconstructed image block and excludes a basic image area.

Assignees

• Chono Keiichi
• Senda Yuzo
• Tajime Junji
• Aoki Hirofumi
• Senzaki Kenta
• Nec Corp

Inventors

• Chono Keiichi
• Senda Yuzo
• Tajime Junji
• Aoki Hirofumi
• Senzaki Kenta

Classifications

• H04N19/117 Primary

  Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635) · CPC title

• H04N19/80

  Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation (H04N19/635, H04N19/86 take precedence) · CPC title

• H04N19/159

  Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction · CPC title

• H04N19/182

  the unit being a pixel · CPC title

• H04N19/00018 Primary

  Electricity · mapped topic