MareArts Computer Vision Study.: 2012.07

7/25/2012

Mesh Grid Tool, Surfer program

If you have x,y,z 3D point data.
For example ..
X Y Z
1.22 2.22 3.22
1.322 6.22 2.22
1.42 3.22 1.22
1.522 1.22 4.22
1.22 3.22 2.22
...

I want to plot 3D surface in matlab.
But It is very hart because the data is too large. The number of data is 1176764.
And The interval of data is not regular.
So to make map(matrix) for plotting is very hard.
and even when I make map(matrix), Matlab did not work because 'out of memory'.

The method to solve is using sufer 9 tool.
We can get mesh grid easy.

The method to use..
Firstly, Get Surfer 9 program.

Second...
In the menu. Select Grid -> Data
Choose your xyz.txt File.
And Open.

In Option window, normally there is no need to set up.
So just click 'OK'

Also 'OK'
then the tool will be working to make grid. After making grid, you can see report.
and then Open your grid file.
In menu, map -> new -> 3D wireframe

7/10/2012

(source code) points click on image and save the coordinate to txt file

environment: Visual C+++ 2008, openCV 2.3

This source code is to save the coordinate that you select points on image.
This is useful when you have many image to save coordinates.

Firstly, you should make image file name in number order.
0.jpg, 1.jpg 2.jpg .....

The code ask to you
1. How many file do you have ?
-
2. How many point do you click on image?
-

There are some keys.
Left button is point selection, Cancel is right button, Space key is next button.
and Ese is the button to finish the work.
After finish the work.

The coordinate is stored in "output.txt"
The format is that
x1 y1 x2 y2 x3 y3 x4 y4
x1 y1 x2 y2 x3 y3 x4 y4
x1 y1 x2 y2 x3 y3 x4 y4
x1 y1 x2 y2 x3 y3 x4 y4
...

[source code]

Thanks you.