Tag: Video Resolution DVR Monitoring Card
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The main principle of DVR technology is to use the high-speed data processing capability of the computer to collect, process and store the video, and realize the multi-picture display of the image by using the high resolution of the display.
As mentioned above, once the case occurs, the video file will be forwarded to the police as the basis for investigation. Currently, many DVRs will be *. Convert dvr or other file formats to *. The avi format is broadcast via a VCD player or media player, but this approach has a big drawback and will be *. The principle of dvr to *avi format is to decompress *dvr into original video, and then recompress the video by using MPEG-1 algorithm, which causes the image quality to be damaged again. In the eyes of the police, the video file is not blurred. Clearly, the validity of the evidence is greatly reduced.
Be aware that the main purpose of installing a DVR is to prevent or provide clear pictures to the police afterwards. When the video file arrives at the police, it is already a blurred picture, then the meaning of the DVR is lost. In response to this situation, Shenzhen Wave Granules invented an EXE video file, converting *dvr to *exe without loss, without installing any player software. , you can directly play HD video without 2 loss.
The most important function of the DVR is to play back the historical video. The playback quality is one of the most important performance indicators of the DVR. When testing the DVR, the camera should be aimed at the close-up moving object video, so that the DVR picture changes more, then observe the recording. Like the effect of playback, if the camera monitors moving objects or stationary objects from a distance, it is impossible to measure the DVR video. Because almost all DVRs are good for a small amount of motion or still picture recording. Finally check the video file size and calculate how much hard disk space is needed per hour.
The resolution is divided into display resolution, preview resolution, video resolution, and display resolution. It only refers to the display resolution of the WINDOWS system desktop. Due to the current upgrade of the display, most of the market is 19" widescreen and their resolution. Generally it is 1400×900 or more, and some are already 1920×1080. Even with a 4:3 display, the optimal resolution is already 1280×1024. It is almost difficult to find a 1024×768 display, and the DVR on the market. A large part still can only support 1024×768. If the large screen is 1024×768, it will cause the screen to be deformed or squeezed, which will greatly reduce the clarity of the WINDOW window text and picture. Install DVR software under this window. Of course, the clarity of the monitoring picture should also be reduced. If we encounter monitoring above 9 divisions, let's calculate 352×3=1056, 288×3=864, 1056×864 is greater than 1024×768, so we can see 8 channels. (Using 9 separate) DVR monitoring screen has been squeezed by the image, and the natural image quality is reduced by the WINDOWS desktop and DVR interface twice. If it is 16 or 24, 32 channels, then 1024× 768 The resolution of the resolution monitoring will be higher and the picture quality will be lower. Careful engineering companies will go to the security exhibition, often see some booths, use large LCD TVs to do DVR card monitoring, far from obvious, go At a glance, the pixel mosaic on the display is exposed and the picture quality is very poor.
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