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Data compression method and device

A data compression and data technology, applied in the field of image processing, can solve problems such as downscaling, and achieve the effects of avoiding bad frames, ensuring quality, and preventing overflow

Inactive Publication Date: 2007-12-19
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, once the compression ratio of JPEG is increased in the prior art, there is a lack of a mechanism to reduce the compression ratio correspondingly after the transmission buffer returns to normal, so as to fully utilize the existing bandwidth to transmit images with the best possible quality

Method used

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Embodiment Construction

[0035] In the embodiment of the present invention, when it is detected that the water level of the compressed data in the transmission buffer has changed, a data compression ratio suitable for the current water level is selected, and data compression is performed according to the selected data compression ratio.

[0036] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and examples.

[0037] Fig. 1 is an overall flowchart of the data compression method of the present invention. As shown in Figure 1, the data compression method includes the following steps:

[0038] Step 101: When it is detected that the water level of the compressed data in the transmission buffer has changed, select a data compression ratio suitable for the current water level.

[0039] Before this step, a water mark is set in the transmission buffer in a...

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Abstract

This invention discloses a data compressing method including: selecting data compression ratio suitable for current water level when testing that the compressed data water level in a transmission buffer region is changed then compressing the data according to the data compression ratio. This invention also discloses a data compression device including: a transmission buffer module and a JPEG compression module, in which, the transmission buffer module is used in testing change of the currently received compressed data level and informing the change information to the JPEG module, which is used in receiving information of water level change from the buffer module to select data compression ratio of the current level and compress data and transmit the compressed data to the buffer module.

Description

technical field [0001] The invention relates to image processing technology, in particular to a method and device for compressing image data. Background technique [0002] Currently, images captured by a camera (PC camera) generally undergo an image compression process before being transmitted, and the compressed data will be sent to a transmission buffer for transmission. Since the Joint Photographic Experts Group (JPEG) image compression method has a relatively high compression ratio, currently, the JPEG image compression method is mostly used for realizing image compression. [0003] However, in the current JPEG image compression method, the compressed data is not transmitted at a constant bit rate. Sometimes, a large amount of data may be output in a short period of time, thus forming a transmission peak. In this way, if the data speed of the input transmission buffer is greater than the data output speed of the transmission buffer, the overflow of the transmission buf...

Claims

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Application Information

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IPC IPC(8): H04N7/26H04N19/152
Inventor 吴大畏
Owner VIMICRO CORP
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