How to automate the following set of commands?

Hey all! I'm fairly new to MATLAB and I'm working on a small project where I have to convert a database of images into a downsampled dataset of fixed resolution and other image properties. So for the following purpose, I am currently using the following commands in sequence for one image.

rec = db.info('filename');
img = freeviewing.analysis.getImg(rec,56.9781,32.0502,screen);
imwrite(img, 'example.png')

So before setting up the commands, I'm calling a image wrapper set up previously, which loads the downloaded image with the appropriate parameters through this command

>> db = imgdb.geisler('Directorypath');

Is there a way to automate the first three commands for every image file and save it as separate files? An example code which I can use would be much appreciated! Thanks!

Answer 1

[Image Analyst]

Sure. Just write a function. This link will probably show you how to do that:

MATLAB Academy - Free 2 hour training

maybe something like

function img = MyCustomFunction(db, fullFileName)
rec = db.info('filename');
img = freeviewing.analysis.getImg(rec,56.9781,32.0502,screen);
imwrite(img, fullFileName); % Save it to disk with the specified file name.

[Kevin Akash Rajasekaran]

Thanks for the answer! With this, wouldn't I still need to input a new file each time I call the function? Or can I do something like *.filetype when calling the function?

[Image Analyst]

You need to have fullFileName be the name of just one file, so have a loop over all filenames and in the loop pass the filename of that iteration into this function.

[Kevin Akash Rajasekaran]

That's cool! Do you have an example code I can refer to for looping?

[Image Analyst]

See the FAQ:

https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F