filtering out letters in an image

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kandlev
kandlev 2020-11-18
回答： Manas Meena 2021-3-25
For %A, I only showed all the periods.
For %B, I only showed all the i's and j's
For %C, I want to only show all the o's
For %D, I want to only show all the p's
I'm having a lot of trouble with C and D where I can't figure out how to only show the o's and p's
Please only suggest morphological operations, that's what I know right now.
originalBW = imread('text.png');
originalBW = logical(originalBW);
figure;
imshow(originalBW);
se1 = strel('square',9);
B1 = imerode(originalBW, se1);
B2 = imreconstruct(B1, originalBW);
C1 = logical(originalBW - B2);
C2 = bwareafilt(originalBW,[10,15]);
figure
imshow(C2);
%B
SE1 = strel('rectangle', [15,1]);
dilateBW = imdilate(C1, SE1);
reconBW = imreconstruct(dilateBW, originalBW);
BW2 = logical(reconBW-C1);
dilateBW2 = imdilate(BW2, SE1);
C2 = imreconstruct(dilateBW2, originalBW);
figure;
imshow(C2);
%C
BW3 = imfill(originalBW, 'holes');
SE2 = strel('disk', 4);
BW4 = imerode(BW3, SE2);
C3 = imreconstruct(logical(BW4),originalBW);
figure;
imshow(C4);
%D
C4 = bwareafilt(C3,12);
figure;
imshow(C4);

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回答（1 个）

Manas Meena
Manas Meena 2021-3-25
To filter out and detect specific letters from a binary image you'll need to define characteristics that define the particular letter you are interested in.
Please refer to the following link for the same

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