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Low noise encoding and decoding method

A technology of encoding and encoding signals, applied in television, electrical components, image communication, etc., can solve the problems that terrestrial broadcasting suppliers are unwilling to provide, difficult to receive, and channels are not enough to use

Inactive Publication Date: 2003-12-31
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compressing an HD program sufficiently to fit two programs at the same time in one satellite channel (e.g., 24MHz 4-PSK modulation) has thus far resulted in unacceptable picture quality for viewers
Hence, satellite broadcast providers are reluctant to broadcast HDTV due to insufficient channels
Likewise, terrestrial broadcast providers are reluctant to take on the responsibility of providing full HD programming when one program completely occupies the channels where several SD programming can exist

Method used

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  • Low noise encoding and decoding method
  • Low noise encoding and decoding method

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Embodiment Construction

[0022] MPEG2, which incorporates an arrangement according to the principles of the present invention, includes two-dimensional (eg vertical and horizontal) filters in front of the encoder. The encoders, output buffers and filters each produce information that can be used by other units to improve overall efficiency. Such information relates to, for example, image motion, image contrast, quantization matrix selection, scale factor selection, bit rate and image texture from individual units. Information is communicated between units controlled by a controller that oversees the coding process, or by individual controllers residing in each unit.

[0023] The controller evaluates the incoming information and identifies commonalities across the group of pictures, a frame, or a portion of a frame, which can be advantageously used to modify the operation of filters and / or encoders to effectively integrate the group of pictures, frame, or portion of a frame into Frames are encoded to ...

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Abstract

An adaptive digital image processor precedes an MPEG2 encoder. The processor receives a high definition (1920 by 1080 pixels per image) video signal intended for broadcast or storage, and adaptively low-pass filters the signal. The signal is subjected to low-pass two-dimensional filtering to eliminate encoding artifacts and related noise. The video signal is then horizontally down-sampled to create a lower resolution hybrid signal (1280 by 1080 pixels per image). A receiver decodes and decompresses the hybrid signal. The hybrid signal is upsampled to its original resolution using existing hardware and software with a software modification.

Description

technical field [0001] The present invention relates to image compression techniques for reducing the bandwidth requirements of digital video encoders. Background technique [0002] The US Federal Communications Commission (FCC) has approved the digital high-definition television (HDTV) standard proposed by the Grand Alliance (GA), thereby clearing the way for terrestrial digital television broadcasting in the United States. The GAHDTV system uses the Moving Picture Experts Group (MPEG2) video compression standard. For details in this regard, please refer to "Information Technology-Generic Coding of Moving Picture and Associated Audio Information: Video," (Information Technology-Generic Coding of Moving Picture and Associated Audio Information: Video," ISO / IEC13818-2: 1996 (E ).) Using modern and well-established video compression techniques such as source processing, motion estimation and compensation, transmission representation and statistical coding, MPEG compression ca...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/117H04N19/80H04N19/86
Inventor 俞豪平戴维・L・麦克尼利小比利・W・拜尔斯
Owner THOMSON LICENSING SA