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How does QCIF CIF 2CIF DCIF 4CIF and D1 compare to each other?
These terms refer to different video resolutions. QCIF (176x144) is the lowest resolution, followed by CIF (352x288), 2CIF (704x288), DCIF (528x384), 4CIF (704x576), and D1 (720x576). 4CIF and D1 are commonly used for high-definition video, while QCIF is typically used for low-bandwidth applications.
What is 4CIF video type?
CIF, Common Intermediate Format, is a format used to standardize the horizontal and vertical resolutions in pixels of YCbCr sequences in video signals, commonly used in video teleconferencing systems. CIF was designed to be easy to convert to PAL or NTSC standards, as it defines a video sequence with a resolution of 352 × 288 like PAL Source Input Format, and a framerate of 30000/1001 (roughly 29.97) frames like NTSC, with colour encoded using YCbCr 4:2:0.QCIF means "Quarter CIF". To have one fourth of the area as "quarter" implies the height and width of the frame are halved. Also there is SQCIF (Sub Quarter CIF, sometimes subQCIF), 4CIF (4× CIF) and 16CIF (16× CIF).SQCIF128 × 96QCIF176 × 144SIF(525)352 x 240CIF/SIF(625)352 × 2884SIF(525)704 x 4804CIF/4SIF(625)704 × 57616CIF1408 × 1152DCIF528 × 384
What is the difference among cif hd1 and d1 resolution pal system?
D1 So-called "full resolution" for TV specs. Normally D1 can mean one of the following video resolutions: * 704x576 (TV PAL) * 704x480 (TV NTSC) * 720x576 (DVD-Video PAL) * 720x480 (DVD-Video NTSC) 4CIF (4 Common Intermediate Format) * 704x576 in PAL * 704x480 in NTSC 2CIF (2 Common Intermediate Format) * 704x288 in PAL * 704x240 in NTSC DCIF (Double Common Intermediate Format) Compared DCIF with CIF and 2CIF: under the same bit rate, the image quality and definition is greatly improved. * 528x384 in PAL * 528x320 in NTSC CIF (Common Intermediate Format) Back in history, this acronym's name comes from video conferencing tools in late 1980's and early 1990's. Nowadays the term CIF is used to mean specific video resolution: * 352x288 in PAL * 352x240 in NTSC CIF is 1/4th of "full resolution" TV, also called as D1 and is best-known because VideoCD standard uses this resolution. QCIF (Quarter Common Intermediate Format) Old video resolution name. 1/4 of CIF video resolution. Standard sizes : * 176x144 in PAL * 176x120 in NTSC
Is 352X240 a better resolution than 704x240?
Both of these are NTSC or North America video resolution formats, which is made up of 480 tv horizontal lines. 352 x 240 is CIF or 1CIF. 704 x 240 is 2CIF. CIF stands for Common Interchange Format. CIF only has 240 lines of horizontal resolution, and is really used when you want to conserve disc space on your recorder, or don't want to record large files due to a hard drive limitation. The NTSC analog signal has 480 lines, which is made up of 240 evenly spaced lines & 240 odd spaced lines. The aspect ratio is 3x4, which is 3 units high and 4 units wide. And that defines horizontal resolution as the amount of vertical space you can see in 3 out of 4 units, or how much you can measure in 75% of the width of the image. CIF designed to match the 240 lines of a field, though it only produces 75%, so you are really seeing 264 TV lines. The rest of your image is discarded, even if you use a ultra high resolution 600 tv line camera. Because of this, you are pretty much throwing away 1/2 of your image, so any camera resolution over 264 tv lines won't look any better. On the other hand, 704 x 240 matches the horizontal scan lines, and the 704 gives us 528 tv lines (704 / 4 x 3), so a 540 line camera will show pretty much all the detail. The reason it does this is because it is the lowest setting you can record, that maintains the full horizontal resolution of the camera, though the vertical resolution is shorter. This is a good step above for better quality recordings, though it will be wide & narrow. So the answer to your question is no, 352 x 240 is not a better resolution than 704 x 240. For the best recordings, you want to go with 4CIF, or 704 x 480, which supports the full 480 vertical resolution of NTSC video signals, giving you the best possible images, though consuming much more hard drive space than CIF.
