Full-color displays have become commonplace with the advent of the Web. Typically they are rendered from desktop computers equipped with 16-bit color palettes capable of generating 65K unique colors. Thus a chart or scale is needed for making informed color selections for graphics applications. In SAS, the programmer has access to both the RGB (red/green/blue) and HLS (hue/light/saturation) cod...

Digital watermarking is the field of digital image processing which deals with hiding information in a digital content. In this paper, performance analysis of DCT (Discrete Cosine Transform) based digital image watermarking using color spaces is done. Mostly, images that are taken for digital watermarking experiments are in RGB (Red, Green and Blue) color space. Eight different color spaces are...

A robust watermark should be able to withstand most image manipulation such as cropping, additive noise and JPEG compression. It is a well known fact that the watermarking of DC components of discrete Cosine transform (DCT) stand against JPEG compression. We build on this concept by inserting a watermark in the transform domain to further enhance the robustness. In this paper, a method for embe...

Steganography is one of the methods used for secret communication. Steganography attempts to hide the existence of the information. The object used to hide the secret information is called as cover object. Images are the most popular cover objects used for steganography. Different techniques have to be used for color image steganography and grey scale image steganography since they are stored i...

The objective of this paper was to develop a means of rapidly obtaining RGB image data, as part of an effort to develop a low-cost method of image processing and analysis based on Microsoft Excel. A simple standalone GUI (graphical user interface) software application called RGBExcel was developed to extract RGB image data from any colour image files of any format. For a given image file, the o...

It is proposed that a new image enhancement scheme using wavelet transform, smooth and sharp approximation of a piecewise non linear filter technique after converting the RGB (Red, Green, and Blue) values of each pixel of the original image to HSV (Hue, Saturation, and Value). Wavelet transform is then applied to the luminance value of V component, it decomposes the input image into the four su...

Computer images have three or four color channels, which are grayscale images representing the intensity of colored ink or light at particular places on the screen. These are RGB (Red-Green-Blue) for work that is intended to be shown by light emitting media such as monitors or projectors, and CMYK (Cyan-Magenta-Yellow-Black) for light absorbing media such as printed paper. An alpha channel is o...

UNLABELLED A cell viability assessment method based computer vision analysis of the uptake of neutral red dye was used to quantify cell membrane integrity in raw and processed parenchyma cells of onion tissues. The presence of stained vacuoles was used as an indicator of tonoplast membrane integrity and photomicrographs were acquired for microscopic image analysis and cell integrity quantificat...

In order to improve contrast and restore color for underwater image captured by camera sensors without suffering from insufficient details and color cast, a fusion algorithm for image enhancement in different color spaces based on contrast limited adaptive histogram equalization (CLAHE) is proposed in this article. The original color image is first converted from RGB color space to two differen...

This paper presents a subband coder for compression of color still images. The red, green, and blue (RGB) color components are rst transformed to a luminance-chrominance representation , and then each of the three image components are decomposed by an FIR analysis lter bank. The two chrominance components are decimated by a factor of 10:1 or 20:1, depending on the bit rate. The coder is based o...