Need help finding coordinates of an image.

Question

Meredith van der Merwe 2020-11-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/657153-need-help-finding-coordinates-of-an-image

编辑： Image Analyst 2020-11-22

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.

2 个评论
显示无隐藏无

KSSV 2020-11-22

What coordinates you want to get for an image?

Meredith van der Merwe 2020-11-22

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

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

KSSV 2020-11-22

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/657153-need-help-finding-coordinates-of-an-image#answer_552203

在 MATLAB Online 中打开

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);

2 个评论
显示无隐藏无

Meredith van der Merwe 2020-11-22

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 2020-11-22

编辑：Image Analyst 2020-11-22

在 MATLAB Online 中打开

RGBXY_to_CSV.m

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.

请先登录，再进行评论。