How to find the valley areas of the image?

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Sk
Sk 2020-1-12
评论： Sk 2020-1-20
How to calculate the depth of the letters in the given image, so that i can find the valley areas ? Please help me.1.jpg

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Image Analyst
Image Analyst 2020-1-14

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KALYAN ACHARJYA
KALYAN ACHARJYA 2020-1-12
编辑：KALYAN ACHARJYA 2020-1-12
The segmention approach for this image is already answerd, for localizing valley region please see the watershed algorithm. It would be great if you follow the Gonzalez Book (Digital Image Processing using MATLAB), where detail explanation is discussed with matlab code. Please note that here you can get the area of valley or basin, not the depth.
rgb=imread('rgb.jpg');
BW1=im2bw(rgb2gray(rgb));
BW2=bwareaopen(~BW1,60);
%% This Part @Image Analyst
windowSize=5;
kernel=ones(windowSize)/windowSize^2;
blurryImage=conv2(single(BW2),kernel,'same');
BW3=blurryImage>0.5;
%% Morpho Operation
se=strel('disk',2);
BW3=imclose(BW3,se);
rgb(~BW3)=0; % Mask Apply
imshow(rgb);
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KALYAN ACHARJYA
KALYAN ACHARJYA 2020-1-20
编辑：KALYAN ACHARJYA 2020-1-20
May be it can slightly improved by preprocessing & appropriate morpho operation.

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