IJ Question: Area Calibration from a Second Picture

[Stephanie Huang]

Hi,

I'm working for the USDA Center for Urban Forest Research, and I'm trying
to implement the use of ImageJ for leaf area analysis.

Is there a possible way to calibrate area from a thresholded region of
known area on a second picture to find the thresholded area of the first
picture? I understand how to use the set scale method (thanks to Larry
Reinking for the PDF), but the two image method would be preferred.

Thanks!

Stephanie Huang
UCD AIChE EJE Representative
UCD EJC VP Of Outreach
UCD SWE President

[hidden email]
[phone]

[Justin McGrath]

If both objects are parallel to the focal plane of the camera and the
same distance from the camera, then the scales are the same as well.

Justin

On 1/30/07, Stephanie Huang <[hidden email]> wrote:

> Hi,
>
> I'm working for the USDA Center for Urban Forest Research, and I'm trying
> to implement the use of ImageJ for leaf area analysis.
>
> Is there a possible way to calibrate area from a thresholded region of
> known area on a second picture to find the thresholded area of the first
> picture? I understand how to use the set scale method (thanks to Larry
> Reinking for the PDF), but the two image method would be preferred.
>
> Thanks!
>
> Stephanie Huang
> UCD AIChE EJE Representative
> UCD EJC VP Of Outreach
> UCD SWE President
>
> [hidden email]
> [phone]
>