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Apparatus for self-adaptive control of data transmission rate according to network bandwidth

A technology of data network and bandwidth, applied in the direction of pulse modulation TV signal transmission, digital video signal modification, electrical components, etc., can solve problems such as the inability to use TM-5

Inactive Publication Date: 2006-07-05
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, TM-5 cannot be used in a variable bit rate (VBR) environment

Method used

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  • Apparatus for self-adaptive control of data transmission rate according to network bandwidth
  • Apparatus for self-adaptive control of data transmission rate according to network bandwidth
  • Apparatus for self-adaptive control of data transmission rate according to network bandwidth

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Experimental program
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Embodiment Construction

[0014] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0015] figure 1 is a block diagram of an MPEG encoder employing the present invention.

[0016] Input image data in units of a group of pictures (GOP) is encoded into intra (I) frames, predictive (P) frames, and bidirectional (B) frames. The I, P and B frames are selectively input to a discrete cosine transform (DCT) unit 120 . The DCT unit 120 performs discrete cosine transform (DCT) of 8x8 blocks to obtain spatial redundancy from selectively input I, P and B frames. The quantizer (Q) 130 removes spatial redundancy of the image data output from the DCT unit 120 . The inverse quantizer 150 performs inverse quantization on the quantized image data output from the Q 130 . An inverse DCT (IDCT) 160 performs an inverse discrete cosine transform on the image data output from the inverse quantizer 150 . A frame memory (FM) 170 stores image data out...

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Abstract

The inveniton provides a transmission rate controller for video data adaptive a network bandwidth that makes temporal changes. This transmission rate device is provided with a video compression means, that quantizes received video data according to a prescribed quantized value to compress the video data, a transmission means that buffers the compressed video data produced from the video compression means to transmit the buffered data to the network, a complexity prediction means that predicts the level of complexity of the video data to be coded from the received video data, and a control means that decides the quantization value of the video compression means, on the basis of the quantity of the data buffered by the transmission means, the level of complexity predicted by the complexity level prediction device and the bandwidth provided from the network and adjusts the quantization value, so that the quantity of the data buffered within the range of the bandwidth matches with a predetermined target value.

Description

technical field [0001] The invention relates to a device for effectively controlling the transmission rate of image data in an image transmission system, in particular to a device for adaptively controlling the transmission rate of image data according to the network bandwidth that changes over time. Background technique [0002] Generally, in an image encoder, an image must be encoded so as to minimize the degradation of picture quality and to maximize the utilization of the available bandwidth when transmitting the image. In "TEST Model 5 (hereinafter referred to as TM-5)" of the standard "ISO / IEC 13818-2: Video" specified by the "ISO / IEC MPEG Working Group", a method used in image encoders is described. Related technologies to control the transmission rate. [0003] TM-5 specified by the MPEG Working Group is basically used to generate image sequences with a constant bit rate (CBR). The amount of transferable data is allocated for each group of pictures (GOP) and assign...

Claims

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Application Information

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IPC IPC(8): H04N7/24H04N19/126H04J3/00H04N19/136H04N19/14H04N19/152H04N19/177H04N19/196H04N19/423H04N19/50H04N19/625H04N19/91
CPCH04N19/152H04N19/164H04N19/177H04N19/61H04N21/238
Inventor 朴相度
Owner SAMSUNG ELECTRONICS CO LTD