Steve Mitchell. Carl might be talking about QCIF? QVGA should be x Wikipedia has a nice reference chart: Display resolution - Wikipedia Note that CCTV resolutions the resolutions we image, encode, record, etc.
Rukmini Wilson. Agree: 1. Alex K. Disagree: 2. John Honovich. Agree: 2. Top Comment Votes - Past 3 Months 1. John Honovich - 2. Chris Dearing - 3. Brian Karas - 4. Marty Major - 5. Shannon Davis - 6. Michael Miller - 7. Hans Kahler - 8. At present, digital surveillance requires that the video stream cannot be too high; 2.
The video transmission bandwidth is also limited; 3. At this stage, there are many D1 products, but the market share is very small; 4.
CIF resolution is adopted, and the signal-to-noise ratio is above 32db, which is acceptable to general users, but it is not ideal for video image quality.
However, with the capacity of a single hard disk reaching GB or even GB, and most domestic DVRs can already connect eight GB hard disks, D1 will gradually become the mainstream. Note: Quarter Quarter; Quad Quartet. In the protocol cluster, the standard capture resolution of the video capture device is specified. The DCIF resolution is the origin of the video image.
Why choose DCIF resolution? The digital surveillance industry puts forward two requirements for digital surveillance products: first, it requires low data volume to ensure that the system can record for a long time and stable real-time network transmission; secondly, it requires high playback image clarity to meet the requirements for details.
The DCIF resolution can meet the above two requirements on the current hardware and software platform. Half D1 resolution has been adopted by some products to solve the disadvantages of insufficient CIF resolution, high storage capacity and high price of D1.
However, since he is only improving the horizontal resolution compared to CIF, the improvement in image quality is not particularly obvious, but the code stream is greatly increased. After testing a large number of video signals, based on the current video compression algorithm, DCIF resolution is better than Half D1 to solve the shortcomings of insufficient clarity of CIF and high storage capacity and high price of D1.
It is used to solve CIF and 4CIF, especially Between Kbps bit rate, stable and high-quality images can be obtained to meet users' requirements for higher image quality and provide better choices for video encoding. The resolution of CIF is not high enough and the storage resolution of D1 is high and the price is high.
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