Need help finding coordinates of an image.

Hi there,

I was just wondering if there is anyway that I can insert an image into Matlab and recieve the coordinates of the image.

The aim would be to recieve the coordinates of the image so that I could use Fouriers Transform and Epicycles in order to redraw the image.

[KSSV]

What coordinates you want to get for an image?

[Meredith van der Merwe]

The x and y coordinates, as if it were plotted onto a graph.

Answer 1

[KSSV]

The image will be plotted wrt it's indices. If I is your image.

[m, n, p] = size (I);
x = 1: n;
y = 1: m;
[X, Y] = meshgrid (x, y);

[Meredith van der Merwe]

Thank you so much, but how do i get it to give me every individual coordinate for the image? It is just displaying the image on a plot for me.

[Image Analyst]

Try this:

[rows, columns, numberOfColorChannels] = size (I);
x = 1 : columns;
y = 1 : rows;
[X, Y] = meshgrid(x, y);
xy = [X(:), Y(:)];

This will give you a 2-D array of x,y values. The x are in the first column and the y are in the second column. It will have one row for every pixel in the image.

IMPORTANT: realize that image variables are not indexed (x,y), they are indexed (row, column), which is like grayImage(y, x) if you want to retrieve the gray level of the pixel at row=y and column = x.

For what it's worth, I'm attaching a demo to turn an image into a CSV file.