MATERIALS AND METHODS: An image-comparison workstation, which alternately displayed two registered and magnified versions of an image, was used to study observer detection of image degradation introduced by irreversible compression. Five observers evaluated 20 16-bit posteroanterior digital chest radiographs compressed with Joint Photographic Experts Group (JPEG) or wavelet-based trelliscoded q...

We have initiated studies towards the design and implementation of an ophthalmic augmented reality environment in order to allow for a) more precise laser treatment for ophthalmic diseases, b) teaching, c) telemedicine, and d) real-time image measurement, analysis, and comparison. The proposed system is being designed around a standard slit-lamp biomicroscope. The microscope will be interfaced ...

Bilateral filtering is widely used to enhance photographic images, but in most implementations is poorly suited to seismic images. A bilateral filter consists of two filter kernels. By replacing one of those kernels with a smoothing filter that conforms to image structures, we obtain a bilateral filter suitable for seismic image processing. Examples and comparison with conventional edge-preserv...

There is a wide range of methods for lossy compression, but among those most used we find JPEG (Joint Photographic Experts Group) for still images. In this paper we present an intelligent system which is capable of restoring a compressed JPEG image by combining the knowledge extracted from the image domain and the transformed domain. It is based on probabilistic self-organizing maps and functio...

Photomosaics are mosaics composed of photographic images instead of solid colored tiles. A Photomosaic is a multi-scale image, conveying different information when viewed up close as when seen from a distance. From a distance, only the global subject of the mosaic should be visible, appearing without discrete components, thus the photographic images chosen must be visually similar to the local ...

The topic of photo-equality in hardcopy technologies has been widely discussed from the beginning of digital printing until today. Photographic quality prints can be made on desk-top printers with little compromises in permanence and performance. The paper compares the status of ink-jet prints in professional and desktop systems with commercial photography. The gamut of typical ink-jet dye and ...

This paper demonstrates design and fabrication o f a mechatronic system for human drowsiness detection. This system can be used in multiple places. For example, in factories, it is used on some dangerous machinery and in cars in order t o prevent the operator o r driver from falling asleep. This system is composed of three parts: (1) mechanical, (2) electrical and (3) image processing system. A...

As the Joint Photographic Experts Group (JPEG) has become an international standard for image compression, we present techniques that allow the processing of an image in the "JPEG-compressed" domain. The goal is to reduce memory requirements while increasing speed by avoiding decompression and space domain operations. In each case, an effort is made to implement the minimum number of JPEG basic...