Camera Question: Steps of Gradations in One Pixel

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stangahman@aol.com Participant Join Date: Aug 2008 Posts: 4	Camera Question: Steps of Gradations in One Pixel 08/19/2008 9:20 AM
	A line chip camera having 4000 pixels with each pixel having subinformation of 256 gradations, then how can we determine how many steps of gradations are in one pixel when a area scan chip is in a camera which has 4.2 megapixels?
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Electroman Guru Join Date: Jul 2006 Location: Dunstable, England Posts: 2821 Good Answers: 45	#1 Re: Pixels ReVisited 08/19/2008 10:30 AM
	One pixel contains 256 levels of information and so it has to have 8 bits to represent that information. the area scanned is the product of the 4000 pixel line length and the linear pixel count. So for 4.2 x 10⁶so the linear distance in pixels for 4.2 million is 1050 pixels... The resulting image will be 4000 x 1050 pixels with each pixel represented by 8 bits or one byte. __________________ A little knowledge is a dangerous thing - Googling is far worse!
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aurizon Guru Join Date: Jun 2006 Location: Toronto Posts: 3968 Good Answers: 120	#2 In reply to #1 Re: Pixels ReVisited 08/20/2008 5:09 AM
	is he speaking of a chip camera with 4000 pixels in one single line, as they have in linear scanners and fax machines? In this case ~470 dots per inch would allow this to scan 8.5 inch sheets of paper line by line, as is now done by roll feed or flat top scanners? Is that the application? __________________ Per Ardua Ad Astra
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ca1ic0cat Guru Join Date: Jun 2006 Location: Rochester, NY Posts: 867 Good Answers: 11	#3 In reply to #2 Re: Pixels ReVisited 08/20/2008 8:19 AM
	I don't know what the application is but Electroman is correct in any case. __________________ Eric
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