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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  • 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 ass...

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  • High precision encoding and decoding of video images
  • High precision encoding and decoding of video images
  • 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 improving video compression quality. The picture quality from MPEG-type video encoding can be improved by saving a higher number of bits during the intermediate encoding and decoding processing steps. The inverse discrete cosine transform mismatch problem can be eliminated by exactly matching the numerical algorithm of the inverse discrete cosine transform (IDCT) function of the decoder with the numerical algorithm of the IDCT function used by the decoding part of the encoder. Also included is the application of high precision compression to wide dynamic range images by extending the range of "quantization parameters" or "QPs". The expansion of the QP can be done by directly increasing the range of the QP or indirectly by a non-linear transformation. It also includes extending the precision by applying the extended intermediate processing precision and the extended QP range to the image contrast-reduced area, and using the extended precision to compress-encode the lower-contrast portion.

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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