Image Load/Rotate/Crop and Collect Data

All,

I am completely new to Image Processing with Matlab. The following is my problem statement.

Goal

Interactively collect data points from scanned image of a test data plot (pen plotter) oftentimes misaligned.

I need to be able to:

1. Load a scanned image to Matlab figure
2. Rotate the scanned image to align vertically and horizontally and crop it as necessary
3. Tell Matlab the following information: a) where the origin is i.e. (0,0) point on the plot in x-y coordinate system; b) what each division (tick-mark)on the plot is equivalent to. For example, one division on the x axis is equivalent to 1 mA and one division on the y axis equivalent to 100 psi.
4. Collect data points by mouse-clicking on the image as many points as needed. I need to be able to zoom in and out. I’m thinking to use “ginput”, “zoom”, and “waitfor” commands.

Please, help.

Eric

Answer 1

[Thomas]

The imtool does the first two point very well. You will have to code for the rest..

 doc imtool

http://www.mathworks.com/help/images/ref/imtool.html

for alignment this answer might help

http://www.mathworks.com/matlabcentral/answers/7601