After research, we have found a more effective monitor video coding resolution (DCIF) with pixels of 528×384. The DCIF resolution is based on the history of the video image. The two HALF D1s, odd and even, are deinterlaced to form a D1 (720*576). D1 is processed as a boundary and becomes 4CIF (704×576). The level of 4CIF is 3 /4 reduction, vertical 2/3 reduction, the number of pixels converted into 528 × 384.528 × 384 is exactly twice the number of CIF pixels, in order to distinguish from the often-called 2CIF (704 * 288), we call it DOUBLE CIF, referred to DCIF. Obviously, DCIF is more balanced than Half D1 in both horizontal and vertical directions.
Why DCIF resolution?
The digital surveillance industry puts forward two requirements for digital surveillance products: Firstly, it requires low data volume to ensure that the system can record for a long time and stabilize the real-time network transmission; secondly, it requires high-resolution playback images to meet the requirements for details. The DCIF resolution on the current hardware and software platforms can well meet the above two requirements.
Half D1 resolution has been adopted by some products to solve the shortcomings of high CIF resolution, high D1 storage, and high cost. However, since he only improves the horizontal resolution relative to CIF, the image quality improvement is not particularly noticeable, but the code stream increases greatly.
After testing a large number of video signals, based on the current video compression algorithm, the DCIF resolution is better than the Half D1 can solve the shortcomings of the CIF definition is not high enough and the D1 storage is high, the price is high, used to solve the CIF and 4CIF, especially In the 512Kbps code rate, can obtain stable high-quality images, meet the user's requirements for higher image quality, and provide better choices for video coding.
CIF sharpness is not high enough and D1 storage is high, the price is high, the disadvantages of the resolution, static playback resolution theoretically up to 360TVline image quality, exceeds the analog monitor standard VHS tape recorder 280TVline image level, to the Ministry of Public Security security industry The clarity requirements of the video standard Level 2 and Level 3 projects meet most video surveillance requirements.
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