create mask that separates objects from white background

Hi,

I need to create a mask for fruits placed inside a white box so i can analsyse the properties of the fruit. A green apple is shown in the attached image for example but the fruits could be a range of colours (excluding black/whitish colours), so i require code to segment these different coloured fruits into a mask that seperates them from the white backgoreund, but I am struggling on how to approach this. Any help would be appreciated.

Thankyou

Answer 1

[BC]

Hi, maybe the code below can help start you off! It's not a perfect segmentation, and I'm fairly new to MATLAB so someone else might have a better method. This link may also help you too, have a look under "Functions", then "Segmentation Techniques".

apple = imread("apple.jpg"); % read in image name
grayapple = rgb2gray(apple); % convert image to grayscale

level = graythresh(grayapple); % get threshold value
BWapple = imbinarize(grayapple,level); % binarize image using the threshold value

BWopen = bwpropfilt(~BWapple,"area",1,"largest"); % filter only the 1 largest blob. The ~ inverts the mask
BWfilled = imfill(BWopen,"holes"); % fill any missing holes


finalimage = imoverlay(apple,~BWfilled,"k"); % burn the mask onto the original image, with black (k) background

imshow(finalimage) % show the final image

[Finn Hartley]

Hi BC,

Thanks for your help! thats exactly what im looking for.