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Image filtering of the frames taken from old motion pictures–color version

Skonieczny S.

Przegląd Elektrotechniczny

2009

R. 85, nr 7

78-83

In this paper a concept of Color Multistage Median Filters (CMMF’s) for denoising purpose is presented. These filters are generalization of well-known MMF, which have been originally designed to process gray scale images. Classically (i.e for gray level images) this is an approach that uses the composition of the basic subfilters. These subfilters operate at the first stage of a cascade filtering substructure in such a way as to match the structure (e.g. lines or contours formed by pixels of the same geometric direction) of the filtering window. By incorporating several subfilters a basic image feature oriented in any direction can be preserved by the filters.

W artykule tym przedstawiono koncepcję Kolorowych Kaskadowych Filtrów Medianowych stosowaną w celu odszumiania obrazów. Filtry te są uogólnieniem zwykłych Kaskadowych Filtrów Medianowych stosowanych do obrazów szarościowych. W przypadku klasycznym podejscie to polega na złożeniu podstawowych podfiltrów działających na pierwszym stopniu kaskady filtrującej w taki sposob, aby dopasować się do struktury (linie lub kontury o określonych kierunkach geometrycznych) okna filtrującego. Dzięki zastosowaniu wielu podfiltrów możliwe jest zachowanie podstawowych cech obrazu w dowolnym kierunku.

Image processing for old movies by filters with motion detection

Skonieczny S.

International Journal of Applied Mathematics and Computer Science

2005

Vol. 15, no 4

481-491

Old movies suffer from various types of degradation: severe noise, blurred edges of objects (low contrast), scratches, spots, etc. Finding an efficient denoising method is one of the most important and one of the oldest problems in image sequence processing. The crucial thing in image sequences is motion. If the motion is insignificant, then any motion noncompensated method of filtering can be applied. However, if the noise is significant, then this approach gives most often unsatisfactory results. In order to increase the quality of frames, motion compensated filters are usually applied. This is a very time consuming and awkward approach due to serious limitations of optical flow methods. In this paper, a review of various filters with motion detection when applied to the processing of image sequences coming from old movies is presented. These filters are nonlinear and based on the concept of multistage median filtering or mathematical morphology. Some new filters are proposed. The idea of these new filters presented here is to detect moving areas instead of performing full estimation of motion in the sequence and to apply exclusively 2D filters in those regions while applying 3D motion noncompensated filters in static areas, which usually significantly reduces the computational burden.