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Method for accessing image data and method for accessing YUV420 image data

A technology of image data and data, applied in the field of real-time compression processing, can solve low-level problems

Inactive Publication Date: 2009-09-16
SUNPLUS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, for the use of the A / B buffer architecture, the cost required to adopt this prior art is not insignificant.

Method used

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  • Method for accessing image data and method for accessing YUV420 image data
  • Method for accessing image data and method for accessing YUV420 image data
  • Method for accessing image data and method for accessing YUV420 image data

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Embodiment Construction

[0083] Image 6 It is a flowchart of a method for accessing image data according to an embodiment of the present invention. Figure 7 is a schematic diagram of matrix A with 30 image data. For the convenience of description below, the image data in this embodiment will be set as the image data with the horizontal resolution of 640 pixels and the vertical resolution of 480 pixels (generally referred to as the image data of 640*480 pixels), and the JPEG Specification of the YUV420 compression format to illustrate this method. Please refer to the instructions as needed Image 6 and Figure 7 .

[0084] The image data of 640*480 pixels includes 30 image data matrices A, such as Figure 7 701, 702...730 are shown. Wherein, any image data matrix A includes sub-image data matrix R of 16 columns, and each sub-image data matrix R includes image unit a of 80 rows, which is expressed as:

[0085] A = R ...

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Abstract

The invention relates to a method for image data access and a method for the access of image data in YUV420 format. The method adopts two different access modes and is used in a buffer to complete access of JPEG image data; therefore, realtime compression of JPEG image data can be realized just through adopting one buffer.

Description

technical field [0001] The invention relates to a method for accessing image data, and in particular to a method for realizing real-time compression processing of JPEG image data only by using one buffer. Background technique [0002] Traditionally, in the application of digital camera or mobile phone camera, the sensor (sensor) generally adopts Charge Coupled Device (CCD for short), or Complementary Metal-Oxide Semiconductor (CMOS for short) . The output of the sensor is based on the line scan (ie Line Base) raster scan (Raster Scan) way to output the image. However, if the image data compression method of the JPEG standard is used, since the compression method of the JPEG standard is based on block scanning (ie, Block Base), for example, image data is processed in a way of scanning 8*8 pixels (pixels). Therefore, between the steps of outputting image data from the sensor and compressing the image data in JPEG format, there must be an additional processing program for con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/41H04N7/26H04N19/15
Inventor 蔡建忠
Owner SUNPLUS TECH CO LTD