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High precision encoding and decoding of video images

A video image and bit stream technology, applied in image coding, color TV parts, TV system parts, etc., can solve problems such as reducing the potential quality of images

Inactive Publication Date: 2006-11-08
DOLBY LAB LICENSING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] The limited precision in MPEG-2 and MPEG-4 also limits the dynamic range (i.e., the number of image brightness levels that can be displayed) and contrast range (i.e., the number of different levels assigned to image regions of similar contrast)
Accordingly, the encoding and decoding methods used in MPEG-2 and MPEG-4 reduce the potential quality of the output, compressed image compared to the original input image

Method used

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  • High precision encoding and decoding of video images
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  • High precision encoding and decoding of video images

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Embodiment Construction

[0038] Higher precision intermediate image processing

[0039] The finite precision assumptions and techniques in MPEG-2 and MPEG-4 are designed to minimize the amount of memory required to store I, B and P frames. However, frame memories are currently quite affordable. The present invention is based in part on the discovery that significantly improved picture quality can be obtained from MPEG-style video coding by saving a higher number of bits during intermediate encoding and decoding processing steps. Surprisingly, this increase in quality does not result in a proportional increase in the total number of bits required to decode the image sequence. In fact, using the present invention generally results in a reduction in the number of bits.

[0040] image 3 is a block diagram of an MPEG-like encoding method according to the present invention. The RGB input frame 302 is applied to an RGB to YUV converter 304 . Because modem frame-generating devices (such as video cameras ...

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Abstract

Methods, systems, and computer programs for improved quality video compression. Image quality from MPEG-style video coding may be improved by preserving a higher number of bits during intermediate encoding and decoding processing steps. Problems of inverse discrete cosine transform (IDCT) mismatch can be eliminated by exactly matching the IDCT function numerical algorithm of the decoder to the IDCT function numerical algorithm used for the decoding portion of the encoder. Also included is an application of high precision compression to wide dynamic range images by extending the range of the “quantization parameter” or “QP”. The extension of QP may be accomplished either by increasing the range of QP directly, or indirectly through a non-linear transformation. Also included is an application of extended intermediate processing precision and an extended QP range to reduced contrast regions of an image to extend the precision with which the low-contrast portions are compression coded.

Description

technical field [0001] The present invention relates to video compression and, more particularly, to novel and improved quality-enhanced video compression based on MPEG-like encoding and decoding systems. Background technique [0002] MPEG background [0003] MPEG-2 and MPEG-4 are international video compression standards that define a video syntax that provides an efficient way to represent a sequence of video images in the form of a plurality of compressed coded data. The language of coded bits is "syntax". For example, several tags may represent an entire block of samples (eg, 64 samples for MPEG-2). Both MPEG standards also describe a decoding (reconstruction) process in which coded bits are mapped from a compressed representation to an approximation of the original format of the image sequence. For example, a flag in the coded bit stream signals whether the following bits were preceded by a prediction algorithm before being decoded with a discrete cosine transform (D...

Claims

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Application Information

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IPC IPC(8): H04N5/14H04N11/04G06T9/00H04N7/26H04N7/30H04N7/32H04N7/50
CPCH04N19/196H04N19/61H04N19/60H04N19/136H04N19/186H04N19/182H04N19/184H04N19/45H04N19/90H04N19/124
Inventor G·A·迪莫斯D·鲁霍夫
Owner DOLBY LAB LICENSING CORP
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