Image Load/Rotate/Crop and Collect Data

Question

Eric Hong 2012-9-25

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:

Load a scanned image to Matlab figure
Rotate the scanned image to align vertically and horizontally and crop it as necessary
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.
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