In this paper, we propose an effective data-adaptive filtering mechanism for sharpening of noisy and moderately blurred images. We establish the connection of our proposed data-adaptive filtering procedure with the classic Difference of Gaussians (DoG) operator widely used in image processing and computer graphics. Our proposed filter renders a data adaptive and noise robust version of the clas...

Several other methods of achieving dynamic range control were also discussed in the previous chapter. These methods are typically unsharp mask filters with large kernel sizes, and multi-scale approaches such as multi scale image contrast amplification (MUSICA) developed by the Agfa-Gevaert company (Vuylsteke & Schoeters, 1999). In achieving their goal of dynamic range control, these methods alt...

Laser beams directed into the sky from astronomical observatories to generate guide beacons for adaptive optics image sharpening systems are a potential hazard to aircraft. Detection systems are needed to sense aircraft and interrupt the laser beam to prevent accidental illumination. We describe here a system designed for this task. A computer examines CCD images of the sky over a wide field of...

Linear filtering of images is usually performed in the spatial domain using the linear convolution operation. In the case of images stored in the block DCT space, the linear filtering is usually performed on the sub-image obtained by applying an inverse DCT to the block DCT data. However, this results in severe blocking artifacts caused by the boundary conditions of individual blocks as pixel v...

A B S T R A C T Masking based techniques are well known and effective for contrast enhancement applications. The conventional unsharp masking in which fixed scale value is using irrespective of the types of test images. In this paper we propose an Optimum Green Plane Masking (OGPM) using Enhanced Genetic Algorithm for the contrast enhancement of retinal images. The green plane has more details ...

The inner-surface damage of water conveyance tunnels is the main hidden danger that threatens their safety and leads to serious accidents. method based on principle acoustic reflection means inspecting water-conveyance tunnels. However, affected by tunnel environment equipment noise, obtained point cloud model inevitably suffers from which can produce erroneous results. Therefore, we proposed a...

BACKGROUND Mammography is the primary imaging technique for detection and diagnosis of breast cancer; however, the contrast of a mammogram image is often poor, especially for dense and glandular tissues. In these cases the radiologist may miss some diagnostically important microcalcifications. In order to improve diagnosis of cancer correctly, image enhancement technology is often used to enhan...