"vislabels" detecting background as an object

Question

Abdul Hannan Qureshi 2022-4-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1699190-vislabels-detecting-background-as-an-object

评论： Image Analyst 2022-4-18

采纳的回答： Image Analyst

在 MATLAB Online 中打开

I want to detect number of lines in the image below:

However, I am getting following output:

Why it is picking background as object count. Can someone advise me what I am missing?.

"bwconncomp" outcome is shown below.

cc = 
struct with fields:
Connectivity: 8
ImageSize: [5023 5036]
NumObjects: 9
PixelIdxList: {1×9 cell}

I am using following simple code:

a = imread ('Image.png');
b = rgb2gray(a);
d=im2bw(b);
vislabels(d);
cc=bwconncomp(d)

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Answer 1

Image Analyst 2022-4-18

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1699190-vislabels-detecting-background-as-an-object#answer_945170

在 MATLAB Online 中打开

You need to call imclearborder since your image has a white frame surrounding the black background.

rgbImage = imread ('Image.png');
grayImage = rgbImage(:,:,1); % Take red channel (faster than rgb2gray).
binaryImage = grayImage > 128;
% Get rid of white frame around the lines.
binaryImage = imclearborder(binaryImage);
imshow(binaryImage)
% Count lines
[labeledImage, numLines] = bwlabel(binaryImage);
caption = sprintf('Found %d lines.', numLines);
title(caption, 'FontSize',16)