Our Federal DVR series and most of our cameras can capture and produce this rare analog image. Specifically, DCIF is the same number of pixels (168,960) as 2CIF, but DCIF is stretched horizontally.ĭ1/4CIF D1 can also represent the following video resolutions: 720×480 (TV/DVD-Video NTSC) 720×576 (TV/DVD-Video PAL) 4CIF (4 Common Intermediate Format) ĩ60H A unique, uncommon format only obtainable from a capable DVR and compatible camera. HD1 Half of a D1 resolution is 704 ÷ 2= 352 still retains the vertical line formatĭCIF DCIF (Double Common Intermediate Format). QCIF QCIF (Quarter Common Intermediate Format) – 1/4 of CIF video resolutionĬIF CIF (Common Intermediate Format) – CIF is also known as Full CIF (FCIF) to distinguish it from Quarter CIF (QCIF) This is called interlaced video.Īnalog Video Resolutions in Pixels (from least to greatest) The odd and even fields are offset one line apart, so when viewed in rapid succession (60 fields per second) they interfix into one another to contrive a complete picture, commonly referred to as a frame, which is made up of 2 x 240 (480) lines. This occurs at a rate of 60 fields (or “i’ frames) per second. When the picture is sent to the DVR the first field of 240 even-numbered lines is sent followed by the second field of 240 odd-numbered lines. This picture is composed over a 480 active horizontal lines. In a digital system, an image is made up of square pixels. As I stated before, an analog video is an image consisting of TV-lines since analog video technology is derived from the television industry. Resolution in an analog or digital picture is similar, but there are some vital differences in how it is defined. Let’s begin with first understanding the difference between a TVL line and a pixel. What’s the difference betwen a TVl and a Pixel For me to accurately describe the concept of resolution of an analog video in a simplistic manner is difficult. In the digital video recorder (DVR) world you get a type of, if you will, a cropped D1 which is a pixel ratio 704×480, also referred to as 4CIF. In the NTSC world, a true classification of “D1” entails 720×480 pixels. They are the relevant formats to network video since video encoders provide like-wise resolutions when they digitize signals from the transmissions received from analog cameras. NTSC (National Television System Committee) and PAL (Phase Alternating Line) resolutions are two respected analog video standards. CCTV systems use an analog video signal which derives from television specifications. Vertical and horizontal TVL (television lines)Ī CCTV cameras resolution is measured in vertical and horizontal TVL (television lines) dimensions and often limited by the capabilities of both the camera and the recorder.
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