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720P, 1080P, 4K, 8K, etc. are often used to indicate the resolution of the video, but so many names are often confusing and confusing, so today I will make the video resolution clear.
'P'
720P, 1080P, etc., mean "the total number of lines of video pixels". For example, 720P means that the video has 720 lines of pixels, while 1080P means that the video has a total of 1080 lines of pixels. A 1080P resolution camera usually has 1920*1080 pixels. "P" itself means "progressive scanning", which is the abbreviation of Progressive, as opposed to interlaced scanning (Interlaced)
'K'
2K, 4K, etc., mean "the total number of columns of video pixels". For example, 4K means that the video has 4000 columns of pixels, specifically 3840 or 4096 columns. 4K resolution cameras usually have 3840*2160 or 4096*2160 pixels.
"P" has the worst meaning, because "P" expresses the pixel measurement in the "vertical direction", which is not applicable in the video surveillance industry. Because, the commonly used "pixel density" calculation (PPF/PPM) is measured in the "horizontal direction".
In this way, the expression "K" is relatively more meaningful, because the pixel measurement in the horizontal direction is directly given, which is very convenient for the calculation and comparison of PPF.