A method for reducing code rate of monitoring compressed video
A technology for monitoring video and bit rate, which is applied in digital video signal modification, TV, electrical components, etc., and can solve problems such as long monitoring time, high video resolution, and huge amount of monitoring video data
Inactive Publication Date: 2008-09-10
陆云昆
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The impact of the change of compression standard on surveillance video is not enough
[0005] In view of the following characteristics of surveillance video: (1) The surveillance time is relatively long and the video resolution is relatively high, resulting in a very large amount of surveillance video data
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[0019] 1. Perform contour detection on video frames, or motion detection, or both contour and motion detection
[0020] First, one or two detection methods must be selected. Compared with contour detection, the computational complexity of motion detection is much lower. Therefore, in the case of insufficient hardware conditions, only motion detection is selected. However, because motion detection can only tell whether there is an object or a person is moving, it cannot tell what object is moving, whether it is facing the camera or facing away from the camera. Therefore, if contour detection is not used, the bit rate reduction effect will definitely not be the best.
[0021] For example, if a person is moving with his back facing the monitoring equipment in a bank, the motion detection will know that something is moving at this time, but he does not know that the surveillance video is shooting the person's back. In the real surveillance video, the amount of information about...
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The invention provides a method for adjusting a code rate control parameter based on contour detection and motion detection, aiming at special videos such as monitoring videos in the field of video compression. The monitoring video is characterized by: (1) a longer time for monitoring, thus causing an ultra-large amount of monitoring video data; (2) the clearer purposiveness of the monitoring; (3) no change of images most of the time in the monitoring video. Viewing from the characteristic (1), the large amount of the monitoring video data means expensive storage devices are required, thus the increasing of the compression ratio of the monitoring video is imperative. However, the increasing of the compression ratio can cause the quality of an image in a video to become poor, thus the compression ratio can not be excessively increased, otherwise, monitoring losses the meaning. Since the existence of the characteristics of (2) and (3) causes the significant increasing of the compression ratio to be possible, the method of the invention dynamically adjusts a video compression code rate control parameter by the contour detection and the motion detection. In addition, the method of the invention can also intelligently detect whether a monitored target exists in a video, if no monitored target exists, the compression ratio of the video can be appropriately increased and if the monitored target exists, the compression ratio can be maintained or appropriately decreased to ensure that a video image is clearer. The method provided by the invention causes the monitored subject to be clearer while increasing the monitoring video compression ratio, thereby opening up a new road for the monitoring video compression. Refer to an attached map in the remark for the detailed realization process.
Description
Technical field [0001] The technical field of the invention patent is the field of surveillance video coding and compression. Background technique [0002] In this technical field, an international video compression standard with a relatively high compression ratio such as MPEG2, MPEG4 or H.264 is generally used for encoding and compression of surveillance video. [0003] If ordinary surveillance video is compressed by the latest compression method H.264, the data volume will be around 200Kb / s. This will generate an average of 720Mb of data per hour. Because the acquisition time of surveillance video is very long, the resolution is relatively high, and there are multiple surveillance points in many public places such as banks. The monitoring video data volume of such a small bank reaches 5T a month, which is really an astonishing figure. Because the price of large-capacity storage devices is very expensive, it has become a very urgent task to increase the compression rati...
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IPC IPC(8): H04N7/36H04N7/32H04N7/26H04N19/142H04N19/146
Inventor 陆云昆
Owner 陆云昆