UnschärfeEntfernung

UnschärfeEntfernung is a term used in optics and image processing to describe a metric for the ability to remove blur from a scene through digital restoration or optical design. It refers to the depth-dependent range within a scene for which blur caused by defocus, motion, or aberrations can be effectively compensated under given conditions. The concept is related to, but distinct from, traditional depth of field, because it incorporates post-processing performance and sensor characteristics.

Definition and measurement: For a specified deblurring algorithm and noise level, UnschärfeEntfernung is defined as the maximum scene distance at which recovered image regions meet a predefined quality criterion (for example a perceptual sharpness threshold or SSIM). It is determined empirically using calibrated test scenes and point spread function models; it depends on the PSF, sampling rate, and noise.

Applications and limitations: It is used to compare imaging systems and restoration methods, characterize the effective depth range of deblurring, and guide camera design and post-processing workflows. Limitations include dependence on scene content, motion patterns, and the assumption that the PSF is known or estimable. In practice, blur removal is challenging in regions with strong depth variation, complex motion, or low signal-to-noise ratios.

See also: deblurring, depth of field, point spread function, image restoration.