Re: calculate magnification

Posted by John Oreopoulos on Feb 10, 2014; 5:15pm
URL: http://imagej.273.s1.nabble.com/calculate-magnification-tp5006474p5006475.html

xlancelot,

You need to know actual physical size of your camera's chip sensor pixels (probably on the order of micrometers) to do this calculation. You can probably look this up in the specification sheet for your camera on the manufacturer's website. Then you can see how big the marks measure on your camera and compare this to the known size of 3 mm.

John Oreopoulos
Staff Scientist
Spectral Applied Research Inc.
A Division of Andor Technology
Richmond Hill, Ontario
Canada
www.spectral.ca



On 2014-02-10, at 11:39 AM, xlancelot wrote:

> Hi everybody,
>
> i would like to calculate the magnification of my image
>
> i took an image of a mark with actual size 3 mm using my webcam
>
> image resolution is 1600x1200 and the webcam is using 2 MP cmos sensor  
>
> now how can i calculate the magnification between the mark real size and the
> mark shown form the image ?
>
> sorry for my bad english
>
> thank you
>
>
>
> --
> View this message in context: http://imagej.1557.x6.nabble.com/calculate-magnification-tp5006474.html
> Sent from the ImageJ mailing list archive at Nabble.com.
>
> --
> ImageJ mailing list: http://imagej.nih.gov/ij/list.html

--
ImageJ mailing list: http://imagej.nih.gov/ij/list.html