Shielding method and apparatus for image frame
An image frame and equation technology, applied in image communication, television, electrical components, etc., can solve the problems of small calculation amount, mismatch between sub-pixel accuracy and integer pixel, obvious block effect, etc. Satisfy the effect of real-time and high practical value
Active Publication Date: 2009-02-18
ZTE CORP
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The above-mentioned second method is simple and effective when the image motion is severe, the signal-to-noise ratio is also high, and the amount of calculation is not large, but the block effect is more obvious
The above third method has a better masking effect when the image motion is small, and the block effect is also small. However, in the encoding standard using sub-pixel precision motion vectors, there is a mismatch between sub-pixel precision and integer pixels, and overlapping of mapped pixels. Some pixels are not mapped
[0006] Although the above three full-frame masking methods can achieve full-frame masking, each has its own shortcomings, and the frame masking effect is not good.
Method used
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[0039] The core idea of the present invention is: for the current situation where the entire frame is lost and the recovery is not good, the present invention determines its mapping method according to the motion vector of the macroblock in the image frame, and uses block-based mapping when the motion vector of the macroblock exceeds the set threshold. The macroblock is mapped in a mapping manner; if the threshold is not exceeded, the macroblock is mapped in a pixel-based mapping manner. The invention selects a suitable mapping mode according to the motion vector of the macro block, which can ensure the quality of the restored image. After the macroblock mapping is completed, interpolation compensation is performed on the unmapped area, and pixel averaging is performed on the overlapping mapped area, which further improves the quality of the restored image. The present invention will be described in detail below in conjunction with the accompanying drawings.
[0040] figur...
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The invention discloses a covering method of an image frame, relating to the whole-frame covering technology in the frame process. the invention is provided to solve the bad effect of the whole frame covering; in order to solve the problems, the following solutions are adopted: covering method of image frame, comprising: calculating the mobile vector for each macroblock for the previous frame of the lost frame while detecting the lost image frame; judging whether the mobile vector of the macroblock is beyond the threshold value; if the vector is beyond the value, the block is mapped to the lost frame according to the mobile vector in the macroblock; otherwise, calculating the front mobile vector of all the pixel points in the macroblock; and mapping the pixel points to the lost frame according to the front mobile vector of the pixel point. The invention also discloses a device for achieving the method. The method of the invention can restore the image quality; the calculating complication is low, which can satisfy the real-time requirement; and the invention can be applied to mobile television, cell phone television, video conference, video television, which has a high practical value.
Description
technical field [0001] The invention relates to an entire frame masking technique in image frame processing, in particular to an image frame masking method and device. Background technique [0002] Now widely used image and video compression standards compress image data very effectively and save image transmission bandwidth. When compressed data is transmitted in an actual channel, it will inevitably encounter various noises and interferences, and transmission errors often occur. In order to eliminate and reduce the impact of transmission errors on the reconstructed image quality, various technical means can be used to eliminate errors, such as forward error correction coding, error control coding, error retransmission, error masking, etc. . Among them, the bit error concealment based on the image post-processing technology is a technology that only uses the information of the decoding end to conceal the error. When the decoder finds a bit error, it uses the various spat...
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Login to View More IPC IPC(8): H04N7/68H04N7/64H04N19/895H04N19/89
Inventor 左雯陈睿王宁刘峰朱秀昌睢世晨
Owner ZTE CORP