With HoughCam you can watch live footage from your camera transformed into hough space in realtime. Also you can save these transformed images with high resolution to your photo-library.
UPDATE: Some people report, that the app crashes immediately after launch. I testest it on both an iPhone 4 and iPhone 3GS and worked fine. I couldnt test it on an iPhone 3G, so it could be, that it doesnt work with it. If the app doesnt work for you, but you have an iPhone 4 or 3GS, or if the app does work, but you have an iPhone 3G, then please send me a mail, to help me clarifing this issue! Thank you!