image analysis of specified area in the image

Hallo everyone,

I have a question about image analysis. I have this following picture.

I only would like to know the specified part(the part surrounded by the green line) which i want to investigate.

Picture size is 64*48.

How i could know that part position and take all that matrix value from that area out?

Thanks so much in advance

JL

Answer 1

[Image Analyst]

That picture has more resolution than 64x48.

To get a mask for the green encircled regions in your starting image, you can do

[rows, columns, numberOfColorChannels] = size(rgbImage)
[r, g, b] = imsplit(rgbImage);
greenMask = r == 0 & g == 255 & b == 0;
% Fill to make solid
greenMask = imfill(greenMask, 'holes');
% Get mean values inside mask
meanR = mean(r(greenMask))
meanG = mean(g(greenMask))
meanB = mean(b(greenMask))
% Get mean values outside mask
meanRout = mean(r(~greenMask))
meanGout = mean(g(~greenMask))
meanBout = mean(b(~greenMask))

We don't know what to do next because what you said you want to do is so vague. Like exactly what does " take all that matrix value from that area out" mean? Do you want to crop the bounding box out to a new image? Do you want the mean R, G, and B in the regions? Do you want to mask the original image, blackening inside the green outlines? Do you want to measure areas or perimeters? Something else? I have no idea.

Please read

TUTORIAL: How to ask a question (on Answers) and get a fast answer

and clarify your request.

[Jialin Men]

Thanks so much for your reply.

Matrix value that i use is not RGB value. I did EDX analysis, get values from it, and the values form is also 64*48.

As you see, similar like this picture. i just want to get all the values which inside of the red lines. therefore i need to know its positions(x,y) and then i could take values from it.