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Frame field self-adaptive detection method

A self-adaptive detection and frame field technology, which is applied in the direction of television, electrical components, image communication, etc., can solve the problems of reducing coding efficiency, selecting coding mode, reducing coding quality, etc., and achieving the effect of high accuracy and high efficiency

Active Publication Date: 2006-02-22
上海比程信息技术有限公司
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Problems solved by technology

The encoder encodes each image according to the preset mode, and it does not have the function of adaptively selecting the encoding mode according to the characteristics of the sequence, which may cause the image that is originally suitable for field encoding to be frame encoded, or originally suitable for frame encoding The image is coded by field, which reduces the coding quality due to the wrong choice of coding mode; in H.264 / MPEG-4 AVC and AVS, the encoder first performs frame coding and field coding on the video signal, and then according to the The encoding cost of the operator determines whether to use frame encoding or field encoding, that is to say, H.264 / MPEG-4 AVC and AVS adopt the method of encoding twice to realize the image-level frame-field adaptive encoding of the interlace sequence, so The coding efficiency is reduced by half, so this method is difficult to apply to occasions with high real-time requirements

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  • Frame field self-adaptive detection method
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  • Frame field self-adaptive detection method

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Embodiment approach

[0046] Such as figure 1 , figure 2 As shown, the present invention provides a frame field adaptive detection method, comprising the following steps:

[0047] Step 1. Calculate the eigenvalue C of the input image 1 :

[0048] If the size of the input image is Width pixels×Height pixels, and the brightness value of the pixel point (x, y) is I(x, y), then:

[0049] C frame _ top = Σ y = 0 Height 2 - 1 Σ x = 0 Width - 1 | I ( x , y ) - I ( x ...

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Abstract

The invention provides a frame-field self-adaptive detecting method, which calculates the characteristic value C1 of input image according to the input image; finding the detecting threshold Tn of present frame according to the first N frames of input image; when C1 H04N 7 / 32 1 7 2 2005 / 9 / 8 1738431 2006 / 2 / 22 100407795 2008 / 7 / 30 2008 / 7 / 30 2008 / 7 / 30 Central Academe of SVA (Group) Co., Ltd. Shanghai 200233 Li Ping Hou Gang Wang Guozhong Li Guoping Chen Yong zhong chengxuan 31213

Description

technical field [0001] The invention relates to a frame field adaptive detection method, in particular to an image-level frame field adaptive detection method for Interlace (interlaced) sequences in the technical field of audio and video encoding and decoding in signal processing. Background technique [0002] Interlace scan (Interlace scan) is a scanning format often used in television systems. It decomposes a frame of image into two fields, of which the top field only contains the odd lines of the image, and the bottom field only contains the even lines of the image. Relying on the persistence of vision of the human eye and some characteristics of the display, the scanning lines of the two fields will appear to be intertwined and become a complete image. The biggest advantage of this scanning format is that it can be used Progressive scanning half of the amount of data achieves a higher refresh rate, so that the picture does not feel flickering, but it also has a big disad...

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Application Information

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IPC IPC(8): H04N7/32H04N19/159H04N19/172H04N19/189
Inventor 李萍侯钢王国中李国平陈勇
Owner 上海比程信息技术有限公司