MATLAB: How to remove the black regions in the holes of the letters

remove the black region

I have detected and cropped the license plate.But the image looks like this.I have to remove the black colur area in the holes in letter"B" and numbers "6" and"9".How can I do so?Anyone please help me. Screenshot (38).png

Best Answer

Looks like you need to improve your segmentation algorithm. Were the white spots ever there in a binary image earlier in the process? Then figure out which step got rid of them. Perhaps it was a bwareaopen() or bwareafilt().

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See my Image Segmentation Tutorial at my File Exchange

Basically you said you've already thresholded your image to create the binary image. so now you just call regionprops():

% Threshold this frame of the video.
binaryImage = grayImage > someThreshold;
binaryImage = bwareafilt(binaryImage, 1); % Take the largest blob ONLY to get rid of noise.
props = regionprops(binaryImage, 'Centroid');
% Now if you're on frame #k of the video
xCentroid(k) = props.Centroid(1);
yCentroid(k) = props.Centroid(2);

MATLAB: Hi, is there a way to detect irregular shapes, then select the ones that are closest to circles and use those for analysis

Then I would not use imfindcircles. Just threshold and find the blobs. Then ask regionprops to give you the area and perimeter. Then calculate the circularities and keep the ones that you think are round enough. Here's some untested code just off the top of my head.

binaryImage = grayImage > 128; % or whatever.
labeledImage = bwlabel(binaryImage);
measurements = regionprops(labeledImage, 'Area', 'Perimeter');
allAreas = [measurements.Area];
allPerimeters = [measurements.Perimeter];
circularities = (allPerimeters .^ 2) ./ (4 * pi * allAreas);
isRoundEnough = circularities < 4; % or whatever value you want.
% Get new labeled image with only the round blobs.
keeperLabels = find(isRoundEnough);
labeledImage = ismember(labeledImage, keeperLabels);
% Re-measure only the round blobs.
measurements = regionprops(labeledImage, 'Area', 'Perimeter');

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