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From: arasv@tplrd.tpl.oz.au (Aras Vaichas)
Subject: Re: scanner sensor physical structure
Message-ID: <1995Feb14.173837.9196@sydrd15.tplrd.tpl.oz.au>
Originator: arasv@sydrd24
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Organization: Telectronics Pacing Systems
References: <3hmqri$qbn@csgrad.cs.vt.edu>
Date: Tue, 14 Feb 95 06:28:23 GMT
Xref: glinda.oz.cs.cmu.edu comp.graphics:70746 sci.image.processing:12627 comp.sys.hp.hardware:6873 comp.sys.hp.misc:4853 comp.sys.hp.apps:3022


In article <3hmqri$qbn@csgrad.cs.vt.edu>, liu@csgrad.cs.vt.edu (Xiangdong Liu) writes:
|> Hello!  Does anyone know the geometric shape of the (probably CCD) sensors
|> of commonly used scanners, such as HP ScanJet XX, in terms of coverage of
|> the picture being scanned?  Is it circular, square, irregular?

Linear. DIP package.
Depends on the lens systems used.
Probably a line.

|> Does this shape affect what a sensor sees, therewith what a scanned
|> pixel represent?  What are the common sizes of such sensors, in terms
|> of sensor spacing?  If the diameter of sensors is smaller than the
|> sensor spacing, should the sensor output be scaled?  Where can I find
|> such information?  Thanks!

Yes, yes - really depends on the lens used.
Sensor spacing is around 10um. Therefore sensor line length = 
No. of elements x 10um
Sensors usually touch each other.
TI catalog on OPTELECTRONICS AND IMAGE SENSORS is v.good.

No problem.

|> 
|> Xiangdong Liu


  Typical DIP Linear CCD
	 _______
PINS--> <       >   
	<   | <------ elements
	<   |   >	
	<   |   >
	<   |   >
	<       >
	 -------
-- 
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  The spelling mistakes expressed here are the author's opinions and 
  do not necessarily reflect the opinions of a dictionary.
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