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Emergent JPEG compression bit rate control device and method thereof

A bit rate control and buffer technology, applied in pulse modulation TV signal transmission, TV, electrical components and other directions, can solve the problems of poor compression effect and slow effect, and achieve the effect of reducing the amount of data and avoiding overflow.

Inactive Publication Date: 2008-04-09
VIMICRO CORP
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose an emergency JPEG compression bit rate control device and method, which solves the problems of poor compression effect and slow effect in the video transmission mode of JPEG compression in the prior art, and can compress the amount of data close to infinite and quick effect

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  • Emergent JPEG compression bit rate control device and method thereof
  • Emergent JPEG compression bit rate control device and method thereof

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Embodiment Construction

[0030] The core idea of ​​the present invention is: according to the need, directly discard the AC (alternating current) coefficient of the image data quantized in the JPEG module to reduce the amount of data.

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] As shown in Figure 1, in the prior art, after the data is input into the JPEG module in the form of 8×8 data blocks, the information in the spatial domain is transformed by the discrete cosine transform (DCT) through the forward discrete cosine transform (FDCT) unit to the frequency domain. After the original image data block is transformed by DCT, 64 DCT transform coefficients are output, the low-frequency components are concentrated in the upper left corner, and the high-frequency components are distributed in the lower right corner. The low frequency component contains the main information of the image (such as brightness)....

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Abstract

The invention discloses a lash-up JPEG bit rate reduction control device, which includes a JPEG module and a buffer module, as well as a buffer management module. The JPEG module is used to compress input data block and output data stream to the buffer module. The buffer management module is used to control JPEG module whether to discard quantified AC coefficient and the discard number, according to the buffer filling state of the buffer module. The invention also discloses a lash-up JPEG bit rate reduction control method. The invention can greatly reduce data volume in video stream compression, and avoid transfer buffer overflow, with no image quality change sensed by users.

Description

technical field [0001] The present invention relates to the field of image transmission processing, in particular to an emergency JPEG (Joint Photographic Experts Group, standard for joint photographic experts group, still image coding standard) compression bit rate control device and method. Background technique [0002] In the compressed image transmission of PC camera (digital camera), since the compressed data of JPEG is not transmitted at a constant bit rate, sometimes a large amount of data may be output in a short period of time, forming a peak transmission. High requirements are put forward for the buffer design of the latter stage processing module. If the data speed of the input buffer is higher than the output speed, the buffer will be full after a certain period of time, causing buffer overflow. [0003] Buffer overflows are intolerable for PC camera applications, as they directly cause the user to observe bad frames in the video stream. [0004] In order to sup...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/26H04N7/24H04N19/129H04N19/132H04N19/152H04N19/625H04N19/91
Inventor 吴大畏
Owner VIMICRO CORP
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