We propose a novel video colorization method based on sparse optical flow and edge-oriented color propagation. Colorization is a process of adding color to monochrome images or videos. In our video colorization method, it is assumed that key frames are appropriately selected out of a grayscale video stream and are properly colorized in advance. Once key frames are colorized, our method colorize...

BACKGROUND Diabetes mellitus is rapidly increasing in the Indian population. The purpose of this study was to identify changes in the retinal vasculature of diabetic people, ahead of visual impairments. Grayscale Fractal Dimension (FD) analysis of retinal images was performed on people with type 2 diabetes from an Indian population. METHODS A cross-sectional study comprising 189 Optic Disc (O...

This paper describes new capabilities of ImageRefiner, an automatic image enhancement system based on machine learning (ML). ImageRefiner was initially designed as a pre-OCR cleanup filter for bitonal (black-and-white) document images. Using a single neural network, ImageRefiner learned which image enhancement transformations (filters) were best suited for a given document image and a given OCR...

Multifractal box counting analysis has been widely applied to study the scaling characteristics of grayscale images. Since bit depth is an important property of such images it is desirable know the impact of varying bit depths on the estimation of the generalized dimensions (Dq). We generated random geometrical multifractal grayscale fields, which were then transformed from double precision to ...

Digital images are used to safeguard confidential & important information. But the problem is providing authentication, integrity and data security to these digital images. In existing techniques of security and authentication conventional watermarking schemes are used. In these techniques cryptography is the basic method adopted which has problem of tampering of information easily by hackers. ...

A color video always conveys more vivid sentiments than a grayscale one. Obtaining a grayscale video from a color video is almost trivial but the converse is known to be hard. Nowadays, digital camcorders come equipped with an infrared device for night shot that enables one to shoot home videos in the dark. Unfortunately, the infrared lighting device used generates a “green-scale” video which i...

The interpretation of diagnostic grayscale images by human beings relies on luminance discrimination at photopic levels. The observer in his search for abnormality relies on luminance modulation. If this hypothesis is valid, then the color of a monochrome presentation should not affect diagnostic performance when the image luminance is equivalent to grayscale levels. Does observer preference fo...