A quality criterion for digitized images with varying coherence of illumination
Josep Arasa, Santiago Vallmitjana, F Abbad, J. Ramón de Francisco Moneo · Journal of Optics · 1990
The process of comparing analogous images digitally obtained by means of a TV camera is studied. These images suffer degradation owing to defocusing, variation in the degree of coherence or because of later application of digital smoothing filters. A numerical quality criterion based on the transfer function, the degree of coherence and a similarity coefficient is developed which put the images in the same order as established by several observers. The application of this criterion permits the automatic comparison and ordering of these images.