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A constant code rate control method based on mobile TV

A control method and mobile TV technology, applied in the field of video coding, can solve the problems of low frame rate, low code rate, and inapplicability to mobile TV

Active Publication Date: 2008-07-09
上海比程信息技术有限公司
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AI Technical Summary

Problems solved by technology

However, the existing code rate control algorithms are all aimed at standard definition images, which are not suitable for mobile TV applications, because the characteristics of mobile TV applications are low code rate, about 10-20Kbps; low frame rate, about 10fps-15fps; At the same time, the structure of the image group GOP is IPPP... so it is necessary to design a code rate control method that meets the mobile TV application

Method used

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  • A constant code rate control method based on mobile TV
  • A constant code rate control method based on mobile TV
  • A constant code rate control method based on mobile TV

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Embodiment Construction

[0033] The method for controlling the constant code rate based on the mobile phone TV of the present invention will be further described in detail below.

[0034] In this embodiment, it is required to perform encoding and transmission rate control on an image including 1 I frame and 14 P frames, the image size is 176×144, and the target frame rate is 30Kbps. A kind of control method based on the constant code rate of mobile phone TV provided by the present invention, described method realizes based on adjusting quantization parameter QP value, concrete realization steps are as follows:

[0035] Step 1, the video image is continuously divided into several GOPs in time, and the target number of bits of each GOP is recorded as Bit gop , Bit gop = ( 1 + N P ) × ( R F ...

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Abstract

The invention provides a control method of constant bit-rate based on a handset television, which divides current images into a plurality of image groups and adopts frame layer rate control and macro-block layer rate control to each image group to code an image. The constant bit-rate control method provided by the invention has high control accuracy, little fluctuation of output bit stream, good subject image quality of coding and very low computation complexity, and is suitable for the application of coding of various software and hardware.

Description

technical field [0001] The invention relates to the video coding technology of mobile phone TV, in particular to a constant code rate control method based on mobile phone TV. Background technique [0002] In real-time video communication, code streams need to be transmitted on networks with different bandwidths. In order to improve the utilization rate of network resources as much as possible while ensuring a relatively high video image quality, there is a demand for the control of the transmission bit rate of the video stream. The current code rate control technology is to control the bit occupancy in the buffer by continuously adjusting the encoding parameters to make it as stable as possible without overflow and underflow; Next, try to ensure the stability of the image quality. In various video compression standards, rate control has always played a very important role, such as: TM5 of MPEG2, TMN8 of H.263, etc. However, the existing code rate control algorithms are al...

Claims

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Application Information

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IPC IPC(8): H04N7/24H04N7/26H04N7/50
Inventor 许昌满李国平
Owner 上海比程信息技术有限公司
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