image processing - Determining resolution -

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i read this:

today digital ip camera resolution defined horizontal (h) , vertical (v) number of pixels (i.e. 640 x 480) or total number of pixels in sensor (h x v = 336k pixels).

how calculation of hxv=336k pixels?

is h = 640 , v = 480? if yes doesn't calculation suppose 307200 =~ 307k?


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