MATLAB: Detect edge and remove it

edge

I need to combine the black and white colour together and left this picture with only the words and number.. can anyone show me on the right approach to solve this problem.

Best Answer

 % - Read RGB image and convert to BW.
 BW = im2bw( imread( 'TEST_7.jpg' )) ;
 % - Build vectors of logicals targeting all-black rows/cols.
 colId = ~sum( BW, 1 ) ;
 rowId = ~sum( BW, 2 ) ;
 % - Make them all white.
 BW(:,colId) = 1 ;
 BW(rowId,:) = 1 ;
 % - Show result.
 imshow(BW)

Is it what you are trying to achieve?

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MATLAB: How to filter the image for blobs of specified size

bwareaopen() removes blobs of a specified size and below. You're calling that, so that part is right. There are also related functions bwareafilt() and bwpropfilt().

Your problem is segmentation, not size filtering. You need to segment your image better. For that particular image I suggest you convert to HSV color space with rgb2hsv, then threshold the s channel to find vividly colored regions. See my demos in my File Exchange, or see the Color Thresholder on the Apps tab of the MATLAB tool ribbon.

MATLAB: I tried to find inner and outer diameter of an circle using this code but it didn’t give me outputs images like below I’ve attached

In this case, you should pick up the region, that has maximum diameter, from the output of regionprops function. Based on your original code, I have slightly modified to do that.

I = imread('8122bCXHqPL._SY463_.jpg');
Igray = rgb2gray(I);
BW = imbinarize(Igray); 
% Measure the outer radius 
BWout = ~BW; 
BWout = imfill(BWout,'holes');
statOuter = struct2table(regionprops(BWout,{'MajorAxisLength','Centroid'}));
[~,idxOuter] = max(statOuter.MajorAxisLength);
outerRadius = statOuter.MajorAxisLength(idxOuter)/2; 
% Measure the inner radius 
BWin = imclearborder(BW); 
BWin = imopen(BWin, strel('disk',5)); 
statInner = struct2table(regionprops(BWin,{'MajorAxisLength','Centroid'}));
[~,idxInner] = max(statInner.MajorAxisLength);
innerRadius = statInner.MajorAxisLength(idxInner)/2; 
% Show the result 
figure
imshow(I) 
hold on 
viscircles(statOuter.Centroid(idxOuter,:), outerRadius,'Color','r') 
viscircles(statInner.Centroid(idxInner,:), innerRadius,'Color','r')

Best Answer

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MATLAB: How to filter the image for blobs of specified size

MATLAB: I tried to find inner and outer diameter of an circle using this code but it didn’t give me outputs images like below I’ve attached

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