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Code rate controlling method with scene change detection

A bit rate control and scene change technology, applied in the direction of pulse modulation TV signal transmission, etc., can solve the problem of unstable change of bit rate

Inactive Publication Date: 2005-07-20
SHIDAI INTION MEDIA TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But there is a problem, the change of code rate becomes unstable, the average code rate of the whole image sequence may be far from the expected value, and the range of code rate change is likely to exceed the bandwidth limit

Method used

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  • Code rate controlling method with scene change detection
  • Code rate controlling method with scene change detection
  • Code rate controlling method with scene change detection

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Embodiment Construction

[0007] 1. A quantization coefficient is selected for the entire image sequence

[0008] (1) Calculate the statistical difference between the brightness signal of the current frame image and the previous frame image.

[0009] Diff n = Σ i = 0 lu | f n ( i ) - f n - 1 ( i ) |

[0010] lu is the maximum value in the value range of the luminance signal. f n (i) Calculated according to the following formula:

[0011] For i=0; i

[0012] For j=0; j

[0013] f n (image n (i,j))++;

[0014] M, N is the width and height of the image; image n (i, j) is the brightness value of the ...

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Abstract

The invention is a code rate control method with scene conversion detection, using picture sequence group as a unit to properly adjust quantization coefficient of picture, and thus controlling relative stability of the code rate and assuring the stability of picture quality, and keeping the advantage of variable code rate. As dividing picture sequence groups, it also considers the character of scene conversion, gives a method for detecting scene conversion and makes it more reasonable to divide the picture sequence groups. The invention can remedy corresponding defects of a traditional code rate control method by a code rate control method for two-pass picture coding.

Description

technical field [0001] The technical field of the present invention is the technical field of code rate control for video coding and compression. Background technique [0002] In this technical field, there are generally two code rate control methods: a constant code rate control method and a variable code rate control method. [0003] The former is characterized by first fixing the total number of bits that can be occupied by an image sequence group GOP (Group of Pictures), and then when compressing each frame image in the image sequence, according to the bits allocated by the previously compressed image Number to continuously adjust the quantization coefficient of the current image to control the number of bits allocated to the current image, so as to ensure a relatively constant bit rate. In this code rate control strategy, the division of image sequence groups is to pre-set how many frames of images each image sequence group contains, without considering the scene chang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N7/24
Inventor 徐荣杰
Owner SHIDAI INTION MEDIA TECH BEIJING
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