how do i segment the attached image based on color?

i need to select the only fruit region and extract various color feature. That is why i need to segment the image and select only fruit region. Please give me your suggestion in this regard.

[Md. Motiur Rahman]

I have done the segmentation and able to select the fruit region. i also get the Pixel Id list of the selected fruit region here thisBlobsPixels = blobMeasurements(k).PixelIdxList; Now how can i use this pixel id list to compute various color channel (red channel, green channel, blue channel) of the selected region. The attached image is gray scale image. Thanks in advance.

Answer 1

[KALYAN ACHARJYA]

    % code
input_image=imread('banana.png');
pattern=repmat(all(~input_image,3),[1 1 3]); 
%convert to white pixels
input_image(pattern)=255; 
imshow(input_image);

[KALYAN ACHARJYA]

By doing loop, you can find the R,G,B of any pixels.

input_image(i,j,1) % gives R value of respective pixel;
input_image(i,j,2) % gives G value of respective pixel;
input_image(i,j,3) % gives B value of respective pixel;

[Md. Motiur Rahman]

i only have pixel id list not x, y coordinates of pixel.

thisBlobsPixels = blobMeasurements(k).PixelIdxList;

it returns all pixel id list in one dimensional array.