Cropping a black area?

Question

I´ve seen there are some scripts here for Cropping and straighten photos from a scanner. But i have a particular problem where i need to remove the black border and leave the black area as transparency for a large number of photos, but leaving the photos unstraightened. I wonder if anyone can give me an idea on how to do this. For reference i post the script i found before for Straightening and cropping.
#target Photoshop
app.bringToFront;
var inFolder = Folder.selectDialog("Please select folder to process");
if(inFolder != null){
var fileList = inFolder.getFiles(/\.(jpg|tif||psd|)$/i);
var outfolder = new Folder(decodeURI(inFolder) + "/Edited");
if (outfolder.exists == false) outfolder.create();
for(var a = 0 ;a < fileList.length; a++){
if(fileList[a] instanceof File){
var doc= open(fileList[a]);
doc.flatten();
var docname = fileList[a].name.slice(0,-4);
CropStraighten();
doc.close(SaveOptions.DONOTSAVECHANGES);
var count = 1;
while(app.documents.length){
var saveFile = new File(decodeURI(outfolder) + "/" + docname +"#"+ zeroPad(count,3) + ".tif");
SaveTIFF(saveFile);
activeDocument.close(SaveOptions.DONOTSAVECHANGES) ;
count++;
function CropStraighten() {
function cTID(s) { return app.charIDToTypeID(s); };
function sTID(s) { return app.stringIDToTypeID(s); };
executeAction( sTID('CropPhotosAuto0001'), undefined, DialogModes.NO );
function SaveTIFF(saveFile){
tiffSaveOptions = new TiffSaveOptions();
tiffSaveOptions.embedColorProfile = true;
tiffSaveOptions.alphaChannels = true;
tiffSaveOptions.imageCompression = TIFFEncoding.TIFFLZW;
activeDocument.saveAs(saveFile, tiffSaveOptions, false, Extension.LOWERCASE);
function zeroPad(n, s) {
n = n.toString();
while (n.length < s) n = '0' + n;
return n;

Answer 1

I have similar data, but a different scripting/action need. I need to label each scanned image with it's filename and place it on the photo, within the photo frame (in some cases, old aerial photos that have been scanned) or within the bounds on new digital photography. Basically, the script I have now is putting it in the black area either completely or partially depending on how much the image is rotated. It's the simple AddFileName.jsx and places the text based off the percent from the left and top values that I put in. The problem I'm running into is that the rotation of the photos changes with each one due to the flight path of the aircraft that took the photos and I'd like a script or an action set that I can use to get PS to detect the pixels immediately within the black area (i.e. on the actual image) and then place the text layer based off that "edge" and the parameters (size, color, etc.) I've set. If there is a way to get the script to determine the first "non-black" pixel and base the placement of the text off of that, then that would probably work. I'm not as concerned with the angle of the text, although it would be great if I could get it to align with the edge of the actual photo and not the bounding box.
My scripting skills are novice at best. I'm comfortable with recording actions and wouldn't mind a combo of the two automation capabilities. For image examples, you can use the ones already provided in this post. We're dealing with similar imagery.
Any assistance you can provide would be greatly appreciated!