Geometric match extraction

[KrzysztofSzewczyk]

Hello,

Im wondering how i can extract from image only area that are in geometric match. I want to measure light intensity of LCD area, but to be precise i dont want to measure whole box but only area of geometric match. 

In attachment you can see that i want to extract only area inlcuded inside green line.

 

Can anyone help me?

Thanks

[Hockeyjim07 · Accepted solution]

You're still going to have a 2D array of information so you can't necessarily get rid of that "black" area. However if you created a binary image from threshold you could then multiply the arrays together and then you would end up with a 2D array that had the original pixel values for the "green area" and then everything else would be a 0 value. This should make whatever calculation you are using for light intensity fairly easy to apply by ignoring 0 values.