(Nice, but without quotes...)

[x,y]=find(A==1);       or

[x,y]=find(A==255);

depending on the pixel-value of white.

you can use the imageJ plugin "point_cloud.jar" which can be downloaed from the link below. Even though it is for CT-scans, it will work with only one-stack image

http://rsbweb.nih.gov/ij/plugins/point-cloud/index.html

if you use MatLab you can use "find" function... type 'help find' for more  details

It seems to be binary images, if it is so, apply connected component algorithm. But first of all, please clarify that what you want to do with these images? Whether you want to extract a portion or doing some processing in internal part of white pixels?

Like Ruxandra said, you don't have that information. It is not present in a bmp, tiff or jpg.

You can use pixel-indices as coordinates, but you could also scale it if you want. If so, rotate the image so that the cow stands on four legs, and measure the distance from head to tail in number of pixels. If you know how big the cow is, you can derive a pixel-size. Choose an arbitrary origin and arbitrary direction of +X and +Y, and you are done!

i want the coordinates of X and Y were the value is one (1).

for example as shown below, if this is the matrix of the image, i want the coordinates of x and y were value is one (1).

0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 1 1 1 1 1 0 0

0 0 1 1 1 1 1 1 1 1 0

0 0 0 1 1 1 1 1 1 1 1

0 0 0 0 1 1 1 1 1 1 0

0 0 0 0 0 0 0 1 0 0 0

0 0 0 0 0 0 0 0 0 0 0

0 0 0 0 0 0 0 0 0 0 0

That's exactly what the plugin 'point_cloud.jar' do. It writes a txt file with a header like "Cartesian Coordinates: X Y Z"

As you only have one slice z=1 and x-y will be the coordinates of pixels with the desired values (255, for example)

http://rsbweb.nih.gov/ij/plugins/point-cloud/index.html

Umar, do you want to know the matrix coordinates of all the pixels that has value=1?

@Parul Nilesh Shah yes i want the coordinate x and y at which the pixel value is 1

By convention pixel-indices start at the upper-left corner, and start with zero. For the first 1 in your example, the pixel-index would be 4 + 2 * DimX , or -expressed as (x,y)-, (4, 2) . All in arbitrary units, because the picture is not calibrated.

if you use MATLAB you can implement this code...

a=rgb2gray(imread('PostFileLoader.tif'));

[x,y,z]=size(a);

count=0;

for i=1:x

  for j=1:y

    if a(i,j)~=0

      count=count+1;

      new_x(count)=j;

      new_y(count)=i;

    end

  end

end

You can get the coordinates values from new_x & new_y

if you are working in matlab, simply use the "Pixel List" function to extract the image coordinates.

I think what Sumi has suggested should work for you.  Basically identify the size of the image using 'size' command and then scan the matrix one pixel at a time by incrementing row and/or column index. Wherever you find pixel value = 1, the respective index is what you want.

Good luck

if A contain your binary image simply use this command in matlab

[x,y]=find(A==1);

(Nice, but without quotes...)

[x,y]=find(A==1);       or

[x,y]=find(A==255);

depending on the pixel-value of white.

Thank you Lambert for correction

% bwImage is the binary image

%Extract linear indexes of foreground pixels and then convert it to subscripts

[x,y] = ind2sub(size(bwImage),find(bwImage));

thank you all

Please, check this link

http://www.mathworks.com/help/images/getting-information-about-the-pixels-in-an-image.html