How to vertically and horizontally scan an image to store a coordinates (positions) of the elements having values other than 255.

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kanika bhalla 2021-6-4

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回答： kanika bhalla 2021-6-5

I want to identify or locate the coordinates of the multi-colored blob present on the white background i.e. (255) as shown in the figure.

For this purpose, I want to scan the attached image image both horizontally and vertically. Scanning should stop and display the coordinates where it finds the pixels value other than 0. The same procedure should be continued for whole image to identify all the coordinates having values other than 255.

I have tried to code it but unable to do so. Code is attached for your reference.

I=imread(Image2); % Read input image
[height, width, plane] = size(I);
 Coordinates = zeros(height,width);
for i=1:height
 for j=1:width
x=i;
y=j;
if I(i,j)~=0
    Coordinate(x,y)=I(i,j)
    end
    end
end

I have attached the two images for your reference. Image1 is manually described multi-colored blob with rectangle. And Image2 is the originlal image.

Any help is much appreciated. Thank you!!!

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Answer 1

Joseph Cheng 2021-6-4

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在 MATLAB Online 中打开

do you need to "scan" in a for loop or are you just looking for the positions of the colors? if you don't need to scan in a for loop the function find() will get the values for you

img = imread('pears.png');

bwimg = rgb2gray(img);

x = linspace(-1,1,size(img,2));

y = linspace(-1,1,size(img,1));

[X,Y]=meshgrid(x,y);

bwimg(sqrt(X.^2+Y.^2)>=.1)=255;

figure,image(bwimg),colormap gray

[r,c,V]=find(bwimg~=255);

hold on

k = boundary(c,r); %just for easier plotting to show points collected

plot(c(k),r(k),'r')

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kanika bhalla 2021-6-4

Thank you so much @Joseph Chengfor your answer. Actually i want to scan so as to get the positions of the colored part with row and column number. So that later I will acess those rows and column easily.

I have also tried the code given by you but it is giving error. Error is described below:

Error using linspace

Too many input arguments.

Thank you for your time.

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Answer 2

kanika bhalla 2021-6-5

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Sir @Walter Roberson, Could you please help me reagrding my query.

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How to vertically and horizontally scan an image to store a coordinates (positions) of the elements having values other than 255.

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How to vertically and horizontally scan an image to store a coordinates (positions) of the elements having values other than 255.

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