filtering out letters in an image

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);

Answer 1

[Manas Meena]

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

• https://www.mathworks.com/matlabcentral/answers/49895-how-to-detect-particular-letters-in-a-binary-text-image