Interpolation frame generating method applied to up-conversion of video frame rate

A video frame and interpolation technology, applied in digital video signal modification, electrical components, image communication, etc., can solve problems such as wrong motion vectors and visual quality degradation of interpolated frames

Active Publication Date: 2014-04-02
ZHEJIANG GONGSHANG UNIVERSITY
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Problems solved by technology

[0007] It should be pointed out that no matter which motion estimation technique and post-processing correction are used, there will be more or less wrong motion vectors, and some local errors may also lead to a sharp decline in the visual quality of the interpolated frame

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[0040] The specific implementation of the method provided by the present invention will be described below with reference to the accompanying drawings. Let the input of three consecutive frames be I 0 , I 1 and I 2 , the frame to be interpolated is I Δt (0figure 1 A block diagram showing a specific embodiment of the present invention includes the following steps.

[0041] (1) step 101, with I 0 is the current frame, I 1 As a reference frame, forward motion estimation is used, and the motion vector field is estimated coarsely and finely with a multi-resolution block matching search algorithm

[0042] (2) Step 102, according to the reliability criterion, judge The reliability of each motion vector in .

[0043] (3) Step 103, the motion vector field The resolution is doubled, and the sub-blocks split from unreliable blocks are further searched to form a motion vector field

[0044] (4) by In the form of motion compensation, the I 0 Blocks in the interpolated fra...

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Abstract

The invention relates to the field of video image processing, in particular to an interpolation frame generating method applied to up-conversion of a video frame rate. Specific to the problems that certain wrong motion vectors are produced and that local errors can cause sharp drop of the interpolation frame quality in the conventional block matching motion estimation algorithm, the method has the characteristic of low error sensitivity degree to motion vectors, so that high robustness is achieved. The method comprises the following steps: (1) estimating a motion vector field in a rough to fine manner by adopting a multi-resolution block matching algorithm; (2) judging the reliability of motion vectors according to a reliability criterion; (3) increasing the resolution of the motion vector field, further determining the initial positions of sub-blocks split from unreliable blocks with a candidate vector, and performing block matching research in a small area; (4) projecting blocks in an input image onto an interpolation frame in a motion compensating form, recording a corresponding relation between pixels in the interpolation frame and pixels in an input frame by using a statistical chart, marking non-corresponding pixels, and weighing and filtering by using a multi-candidate time domain to calculate the values of the pixels.

Description

technical field [0001] The invention relates to the field of video image processing, in particular to an interpolation frame generation method applied to video frame rate up-conversion. Background technique [0002] Frame rate up-conversion is a video image processing technology with important application value. By interpolating some new frames in the time domain to increase the frame rate, thereby improving the performance of the display device to display dynamic images, reducing the display due to the device's display retention characteristics ( Taking LCD as an example, the smearing phenomenon introduced by each pixel keeps the brightness constant within the duration of one frame). The application of frame rate up-conversion includes: video format conversion, such as 24 frames per second movie played on a TV with 25 frames per second or 30 frames per second playback rate; low bit rate video encoding, that is, at the encoding end One or lower frame rate encoding, in order...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/577
Inventor 王勋陈卫刚时佳佳
Owner ZHEJIANG GONGSHANG UNIVERSITY
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