Automatically Determining and Correcting Lens Blurring in Cameras

R. Kutka (Germany)


Blurring, inverse filtering, video phone


Future mobile terminals such as video mobile phones and multimedia PDAs will incorporate small, inexpensive lens systems with a focal length capable of neither manual nor automatic adjustment that will inevitably offer inferior imaging quality. The technique presented here measures blurring during operation and corrects this where possible by means of adapted inverse filtering. It entails detecting lines and edges in any image material and using these as test image structures for calculating the impluse response. Lens blurring can be constantly determined from these and corrected during use. This method functions independently of the make of the camera and incidental lens defects.

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