Image error hidding method
An error concealment and image technology, which is applied in the direction of error prevention, image communication, digital transmission system, etc., can solve the problems of unsatisfactory error concealment effect, large frame difference, high computational complexity, etc., and achieve excellent subjective image evaluation, Satisfy real-time requirements and enhance the effect of practical value
Inactive Publication Date: 2003-04-09
ZTE CORP
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Temporal interpolation and spatial interpolation methods can obtain better error concealment effects in the case of small motion or static frames, but in large motion video sequences, due to the larger frame difference, satisfactory visual effects cannot be obtained
In recent years, many new error concealment schemes have emerged, among which the patent No. 99122818 is "Error Concealment or Correction of Voice, Image and Video Signals". Stability under group and group errors, but not applicable to error concealment of real-time video on the Internet; US Patent No. 6,175,597 "Methods and apparatus for error concealment", this patent method uses image interpolation method for error concealment, suitable for still Or the error concealment of the macroblock in the small motion image frame, but in the large motion image frame, the compensation to the error macroblock will not get a satisfactory error concealment effect; A method and device for compensating errors in video signals", the patented method has high computational complexity and is not suitable for real-time video decoding, and the increase in computational complexity is acceptable for decoding static images, but it is not suitable for decoding static images. The decoding of real-time video cannot tolerate
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[0015] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0016] The error concealment control method of the present invention can be specifically divided into three parts: error concealment control when large motion frames are lost, error concealment control when small motion frames are lost, and error concealment control when still frames are lost. Such as figure 1 Shown:
[0017] The first step is to receive data packets from the channel, detect packet loss and determine the attributes of the previous frame. Attributes are customized by the inventor: big motion frame, small motion frame, still frame. Specifically include the following steps:
[0018] 1) After the decoding of the previous frame is completed, the average motion vector of the macroblock of the frame is counted;
[0019] The specific implementation is as follows: MV x ‾ ...
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This invention is to resolve the problem of controlling image error concealment, including first receiving data packet from the channel and detecting if there is lost packet, and judging the attribute of the last frame. According to the judged attribute of frame, when a packet is lost, if the last frame is a large motion one, the image if frozen and renewed quickly, and if it's small one, the receiving end uses the last frame pel value MV to replace the pel value of the harmful macroblock, among which MV is the middle value of that of the macroblock adjacent to it, if it's a satatic frame, the receiving end uses the macroblock pel value at the same position with the last frame to replace that of macroblock harmed due to the lost in this frame final image data afer error concealment and decoding are sent to the buffer storage display and returned.
Description
technical field [0001] The invention belongs to the field of image information transmission and processing, and in particular relates to an image error concealment method. Background technique [0002] Transmitting real-time video streams on the Internet has become an important part of Internet multimedia applications, but the current Internet does not provide any QoS guarantee, so when the network is congested, video data packets may be lost. According to the fact that the human eye can tolerate a certain degree of video signal distortion, if a packet loss occurs, the receiver must use an error concealment method to cover up the image damage caused by the data loss, so that the human eye cannot feel the existence of the error. [0003] There are two types of traditional error concealment methods: temporal interpolation and spatial interpolation. Spatial interpolation uses adjacent spatial information to reconstruct lost pixel values, while temporal interpolation uses data ...
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IPC IPC(8): H04L1/00H04N19/895
Inventor 王宁周蓉吕远
Owner ZTE CORP