Script/ Solution to Remove Black Borders from batch Images.

I have batch of images with uneven black borders. The border can be 1px left, 2px right, 1.5px up, 1 px down, so they are uneven, and are scanned so they are shades of black. Even with Batch border removed, sometimes they have a weird dirty looking black edge,left, i want script so it removes that too. End Result must be a clean image with no black border. You can provide me a solution script using irfanview, photoshop, photoscape, etc. or a custom c++ program made for this or anything that will work best! Image must be saved as same earlier image. This is for Batch Images so there is no need for oversight. Would be nice if script can do Images in Folders selected. Or drag drop works too. Price is to be Less than 20 dollars!