Method, device and system for protecting trial witness picture and video motion picture

Abstract

The invention discloses a method for protecting a trial witness picture. The method comprises the following steps of taking a witness room picture before a witness enters a witness room as a reference frame, taking a witness room picture after the witness enters the witness room as a current frame, and executing an encoding process; calculating the sum of brightness absolute differences between macro blocks corresponding to the reference frame and the current frame; determining a witness rectangular region in the current frame according to a macro block whose sum of brightness absolute differences is greater than or equal to a threshold, and setting the witness rectangular region as a region of interest in the current frame; setting an H.264 coding quantization parameter of the region of interest in the current frame to be larger than H.264 coding quantization parameters of other regions except the region of interest in the current frame; performing H.264 encoding on the current frame and then sending out the current frame; and taking the current frame as the reference frame, taking the next frame of the current as the current frame, and repeating the encoding process circularly. The invention further discloses a trial witness picture protection device and system, and a video motion picture protection method and device. The method, the device and the system for protecting the trial witness picture and the video motion picture provided by the invention can realize the dynamic protection of the witness picture in motion, and ensure real-time and fast trial live streaming.

Description

technical field [0001] The present invention relates to the field of video technology, in particular to a method, device and system for protecting court witness pictures, and a method and device for protecting video moving pictures. Background technique [0002] During the trial process of the digital court, the trial video needs to be broadcast live in real time and recorded for backup. In the actual trial process, there will be situations where witnesses do not want their own testimonial images to be exposed, so it is necessary to protect the witness images. A digital trial witness collection and protection system is provided in the prior art to realize the protection of the witness picture. [0003] The witness collection and protection system consists of the witness room video collection and video display system, the court trial host, and the court video display equipment. The witness room generally consists of a single room, separate from the courtroom. The video col...

AI Technical Summary

Problems solved by technology

[0010] 6. After the trial started, the mosaic images of the witnesses were displayed on the video display equipment of the court, and the personnel in the court could not clearly see the physical characteristics of the witnesses;

[0013] 1. When the witness is testifying, the area covered by the mosaic is fixed. When the body of the witness moves out of the area of ​​the mosaic, the mosaic cannot cover the body of the witness, resulting in the exposure of the physical characteristics of the witness;

[0014] 2. The court trial video is live broadcasted in real time through the network, which has high requirements for real-time performance. Additional image processing is required between witness picture collection and encoding, and mosaicing the witness picture will consume a lot of performance of the court trial host, which will lead to video The live broadcast produces a large delay, which increases the system burden of the court trial host

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