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Image processor principle and classification
Screen processing equipment can be divided into two categories:
One is a picture splitter (mostly Quad), and the quad is a digital processing of four video signals at the same time, and each single picture is compressed into a 1/4 picture size by a pixel compression method. Placed in the signal 1/4 position, on the monitor combined into a four-screen display. The screen is divided into four frames and the video recorder simultaneously captures four frames in real time. The VCR treats it as a single screen. In this method, only the encoding processing program does not need to go through the decoder during playback. Although there are many quadrants that allow the screen to be sent back in full screen during playback, this is only electronic amplification, ie, the 1/4 screen is enlarged to a single screen. Because all operations are performed in four divisions, the resolution and quality of the screen will be sacrificed. When the demand for the entire action is higher than the requirement for the sharpness of the picture, quad splitting is a good choice. Such as industrial process control and gambling. The screen divider has four divisions, nine divisions, and sixteen divisions. It can display the images of 4, 9 and 16 cameras simultaneously on one monitor, and can also be sent to the recorder for recording. Quadrisection is one of the most commonly used devices, and its performance and price ratio are also better. The quality and continuity of the image can meet most of the requirements. Nine and sixteen segments are more expensive, and the resolution and continuity of each image after segmentation are reduced, and the video is not good. There are also six-, eight-, and quad-segment devices, but image ratios, sharpness, and continuity are not ideal, and market usage is even smaller.
The other type is Multiplexers, which also become picture frame compression processors. They are based on the smallest unit of image - field or frame, ie 1/60 second (field switching) or 1/30 second (æ¡¢ switching). The image time is coded individually and processed individually, recorded on the tape in turn according to the order of the cameras, and the identification code is edited. When the video is played back, the images with the same identification code are stored in the corresponding image memory, and then the pixels are compressed and sent to the monitor. Multi-picture mode display. This technology allows the video recorder to sequentially record the images entered by each camera. Each frame is a full frame (if the system only takes a single field, its resolution will be reduced to half), so there will be no loss in the quality of the picture. However, the update rate of the screen is divided by the number of cameras, so there will be a delay in the screen. If you want to record 10 cameras, each camera can only take 3 frames per second. Although there are still 30 frames per second during playback, it is not a 30 different frame. When using a multiplexed processor, the number of frames that can be recorded per second decreases. On the market, it is easy to see the frame processor connected to more than 16 cameras, and connected with 960 hours of long-term video recorder. This combination will result in the recording of one picture every few minutes, which is inefficient compared to other methods.