The ORB (Oriented fast and rotated brief, ORB) algorithm is limited by its inability to extract feature points or only a small number of when fixed threshold used in complex lighting conditions. To address this issue, study proposes method that combines image enhancement with truncated adaptive improve the extraction algorithm. Firstly, original converted grayscale. Secondly, enhanced applying ...

Zusammenfassung. Heutige digitale Radiographiesysteme benutzen zur Verbesserung der Bilddarstellung meist Algorithmen, die auf der unscharfen Maske (\unsharp masking") basieren, wobei die zu lternde Radiographie in zwei bis drei Frequenzbander zerlegt wird. Dies ermoglicht sowohl eine Verbesserung des Sch arfeeindrucks der Radiographie (Verst arkung des hochfrequenten Bandes) als auch eine ...

ABSTRACT In this paper, we describe a new method to select globular cluster (GC) candidates, including galaxy subtraction with unsharp masking, template fitting techniques, and the inclusion of Gaia’s proper motions. We report use 12-band photometric system used by S-PLUS determine radial velocities stellar populations GCs around nearby galaxies. Specifically, assess effectiveness identifying m...

Mammogram is important for early breast cancer detection. But due to the low contrast of microcalcifications and noise, it is difficult to detect microcalcification. This paper presents a comparative study in digital mammography image enhancement based on three different algorithms: homomorphic filtering, unsharp masking and our proposed methods. This latter uses a hybrid method Combining conto...

An approach for contrast enhancement utilizing multi-scale analysis is introduced. Sub-band coefficients were modified by the method of adaptive histogram equalization. To achieve optimal contrast enhancement, the sizes of sub-regions were chosen with consideration to the support of the analysis filters. The enhanced images provided subtle details of tissues that are only visible with tedious c...

Diabetic retinopathy is an eye disease that is caused by damaging of the retinal blood vessels due to long term diabetes. It is important to automatically detect the DR lesions at early stage in order to prevent the further vision loss. Exudates are bright lesions that are considered as primary sign of this disease. In this paper, a hybrid approach is proposed for automatic detection of exudate...

A complete system for old picture restoration is described: in particular, a frame alignment method, a simple deblotching algorithm and a nonlinear approach for contrast enhancement are proposed. The frame alignment uses a global motion compensation, with a logarithmic search for the correction vector. The blotch removal step consists of two stages. Blotches are rst detected using two suitable ...