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Method and device for coding low-bandwidth scene change video image

A scene switching and video image technology, applied in the field of image coding, can solve problems such as poor user experience, degraded image quality, slow recovery speed, etc., to achieve the effect of enhancing experience, eliminating error diffusion, and improving recovery speed

Active Publication Date: 2012-10-31
NEW H3C TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In other words, the image quality degradation caused by the scene switching of 6-7 frames may take a long time to recover, and the recovery speed is too slow and the user experience is not good

Method used

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  • Method and device for coding low-bandwidth scene change video image
  • Method and device for coding low-bandwidth scene change video image
  • Method and device for coding low-bandwidth scene change video image

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Embodiment Construction

[0040] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] In order to increase the speed of image quality restoration when scene switching occurs, the present invention needs to solve two problems: one is how to detect scene switching; the other is how to optimize the image at the scene switching point to speed up the recovery speed from blur to clarity. These two aspects will be described in detail below.

[0042] The inventive method such as figure 1 As shown, wherein, steps 101-103 solve the problem of the first aspect above, and step 104 solves the problem of the second aspect above.

[0043] Step 101: Determine at least two frames that need to be detected immediately before the current frame according to the scene switching duration, and use the farthest frame as the distant frame t...

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Abstract

The invention provides a method and a device for coding low-bandwidth scene change video images. The method comprises: in video image coding, determining a far neighboring to-be-detected frame and a near neighboring to-be-detected frame, which are required to be detected, according to scene change time length; calculating an offset characteristic values according to the respective offsets of the frames; comparing the offset characteristic values and preset thresholds; and when the offset characteristic values are greater than the thresholds, coding an I frame and inserting the I frame as a current frame. When the scheme of the invention is used, scene change can be detected accurately in video coding, the I frame capable of eliminating error diffusion is inserted in the place where the scene change happens, and thus, the speed at which the images are restored to a clear state from a fuzzy state is increased and the user experience is enhanced.

Description

technical field [0001] The invention relates to image coding technology, in particular to a coding method and device for scene switching video images in low bandwidth. Background technique [0002] Under low bandwidth, if the video image coding maintains a high compression rate, the image prediction error will increase when scene switching or other complex situations occur instantaneously, and the quality of the video image will decrease significantly as the error spreads. On the contrary, if the scene is static or low complexity, the video image quality is relatively high. For example: In a video conference, the bandwidth allocated to the video encoder is generally relatively low. If the content of the video image is a slideshow (PPT) explained to the participants, the quality of the video image is relatively clear when the page of the slideshow is in a static state, but when the scene of the slideshow page is switched, the image quality will be reduced. It becomes blurry...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/26H04N19/142
Inventor 吴坚雷奕
Owner NEW H3C TECH CO LTD