Recognize some objects and delete other objects from image

How can i isolate my green '+' selected objects from the other objects.I only want to plot the green objects and want to delete others object from my image.I need an idea to do that.

Answer 1

[Samia Sanjari]

Hello Image analyst Do you have any idea how can i do that?I already selected my objects and marked them by green '+'.I only want to show these green selected objects in my image.

Thanks in advance

Answer 2

[Image Analyst]

Basically you need to find everything except squares. You can do that by adapting my attached shape recognition demo.

[Samia Sanjari]

no actually do not want to separate those objects according to their shape.I actually want to separate those objects which are indicated by green '+'.Mean shape does not matter,matter is '+' green sign.

[Image Analyst]

First find the green where the red and blue channel are low and the green value is high.

% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
greenCrosses = greenChannel > t1 & redChannel < t2 & blueChannel < t3;

Next find white where all channels are high.

whiteBackground = greenChannel > t1 & redChannel > t1 & blueChannel > t1;

Then use imclearborder() to get rid of the surround.

shapesOnly = imclearborder(whiteBackground);

Then use imreconstruct with the white image and the green image to get only those shapes with green on them.

See if you can finish the code.

[Samia Sanjari]

Thank you.I will let you know .