Edge Detection

Edge Detection is a simplistic piece of software capable of detecting the corners of objects within pictures, encasing them in rectangles.
It doesn't include special options or customization settings, making it ideal for users looking for a straightforward method to detect edges without worrying about complex features.

No setup required, besides .NET Framework

The program's not packed in a setup kit. Instead, you can copy the downloaded items to a custom directory on the disk or to a removable storage unit, in order to launch it on any machine with as little effort as possible.
It doesn't modify system registry settings. However, it auto-updates one of its files on exit to remember you settings and depends on .NET Framework to work properly, so you must have this platform installed.

Detect image corners and make adjustments

As far as the interface goes, Edge Detection adopts a standard window with a minimalistic look that contain only two buttons for image loading and edge detection. It doesn't put emphasis on graphical elements, preferring to focus on functionality instead.
You can resort to the built-in file browser to locate and open a graphic file, view its contents in the window, as well as click the button to trigger the automatic edge detection.
The tool displays four blue circles that mark the corners of the picture, giving you the possibility to adjust them by clicking and dragging. The area enclosed by them is highlighted in yellow. Moreover, it shows a circular magnifier to help you spot the margins and fine-tune the selection. There are no other notable options provided by this app.

Evaluation and conclusion

As expected from such a compact utility, it had minimal impact on the machine's performance in our testing, running on a low amount of CPU and RAM. No error dialogs popped up and it didn't hang or crash.
On the other hand, Edge Detection doesn't come bundled with additional features for image processing. It's not even explicit concerning the supported file types. We've noticed that it works with JPEG, PNG, BMP and GIF, among other extensions.