AW: Non-square pixels test

Posted by Gerhard Holst on Dec 02, 2005; 1:16pm
URL: http://imagej.273.s1.nabble.com/Non-square-pixels-test-tp3704327p3704331.html

Dear Gabriel,

even if any function would exist, allowing for measuring this, what would it mean?
In case of Interline CCDs or CMOS image sensors with microlenses on the pixels, you might find out
with special test setups if the acceptance angle varies between horizontal and vertical.
Nevertheless it is impossible to exactly find out just by the image.

I know that photogrammetry uses calibrated set-ups which are imaged and further
with a lot of calculations and the knowledge about the real dimensions of the imaged object
the image sensor can be precisely calculated.

Best approach maybe the sensor data sheet.

I am in doubt, if this information can be gained just from an image.

With best regards,
Gerhard


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Dr. Gerhard Holst
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PCO AG
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-----Ursprüngliche Nachricht-----
Von: ImageJ Interest Group [mailto:[hidden email]] Im Auftrag von Gabriel Landini
Gesendet: Freitag, 2. Dezember 2005 13:06
An: [hidden email]
Betreff: Non-square pixels test

Hi,
Can somebody point me to what is the proper way to find out in a plugin if the image is made of square pixels?

Is this testing if cal.pixelWidth() is the same as cal.pixelHeight()?

Any examples?

Many thanks,

Gabriel