ASTR310 Lab01: Plotting FITS images
Assume that you already copied the .m files img2fits.m and rfits.m in your current directory, and you have the sample.img file in the directory images/.
Contents
Change the file format
The first step is to change the .img files (a special format valid only for this camera) into .fits files (FITS is a standard astronomical format). This can be done by simply calling the function img2fits:
img2fits('images/sample.IMG');
You will find a new file with the name sample.fits in the directory images/.
Read the FITS file
Now read in the images by using the rfits procedure:
s = rfits('images/sample.fits');
The variable s is a complex data structure. It contains a numerical data array named s.data (which is what we need), and the header information is included in other components of the s structure.
Plot the data
Now you have s.data as a data array. To visualize, you may type
imagesc(s.data);
