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An efficient image compression scheme to minimize storage and bus bandwidth requirements

An image and memory technology used in the field of digital video

Inactive Publication Date: 2010-08-04
QUALCOMM INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these previous attempts suffered from various disadvantages

Method used

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  • An efficient image compression scheme to minimize storage and bus bandwidth requirements
  • An efficient image compression scheme to minimize storage and bus bandwidth requirements
  • An efficient image compression scheme to minimize storage and bus bandwidth requirements

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[0079] Two alternative implementations are presented in this section to take advantage of the encoders and / or compression schemes described above. These implementations include tightly packed implementations and loosely packed implementations.

[0080] A. Tightly packed tiles in the framebuffer

[0081] The first implementation requires that the compressed tiles be packed together tightly in one long bitstream. Tightly packed tiles are stored tightly in the framebuffer. Tile storage in the framebuffer tightly packed uses memory resources efficiently and, additionally, achieves the most efficient use of the bus. For example, in the case of a tightly packed framebuffer, the data fetcher unit in the decoder can use the maximum burst size for each transaction on the bus. This tightly packed implementation also uses memory efficiently and is especially useful for applications that do not need to randomly access tiles in the framebuffer. A liquid crystal display (LCD) controller...

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Abstract

A method of encoding receives an image and tiles the image into a set of tiles. Each tile includes a set of pixels. The method selects a first tile and determines a first set of values for the pixels in the first tile. The method separates the determined values of each pixel in the first tile into several streams. For a first stream, the method determines a bias value, and subtracts the bias value from each value within the stream, thereby generating a set of subtracted values. Typically, the subtracted values have one or more leading zeros, and the method preferably removes one or more of the leading zeros, thereby reducing the number of bits required to represent the subtracted values within the first stream. Thus, one or more of the values within the first stream is advantageously represented with fewer bits. Additional embodiments include an encoder for encoding data by using a reduced number of bits, and a system, and decoder, for transmission, reception, display, storage and / or retrieval.

Description

[0001] This application claims priority to US Provisional Application No. 60 / 946,972, filed June 28, 2007, which is hereby incorporated by reference in its entirety. technical field [0002] The present invention relates to the field of digital video, and more particularly, to an efficient encoding scheme to minimize storage and bandwidth requirements. Background technique [0003] There has been a wireless electronics revolution in recent years due to the rapid advancement and adoption of many new digital wireless communication protocols. For example, Code Division Multiple Access (CDMA) and Global System for Mobile Communications (GSM) have greatly increased the popularity of digital cellular phones, and Wi-Fi local area network (LAN) protocols such as 802.11b, 802.11g, 802.11a have revolutionized wireless computer networking, and Bluetooth has provided a very useful short-range wireless digital protocol to many different digital devices. [0004] Advances in wireless pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26
CPCH04N19/00278H04N19/0049H04N19/00127H04N7/26244H04N19/00309H04N7/26122H04N19/00139H04N7/26712H04N7/26287H04N7/26111H04N19/176H04N19/132H04N19/136H04N19/184H04N19/426
Inventor 维贾伊·苏布拉马尼亚姆
Owner QUALCOMM INC
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