1 The author was supported in part by NSC grant 94-2213-E-033-031. 2 The author was supported in part by NSC grant 94-2213-E-033-024. Abstract Fingerprint image enhancement is a common and critical step in fingerprint recognition systems. To enhance the images, most of the existing enhancement algorithms use filtering techniques that can be categorized into isotropic and anisotropic according t...

Absirac--This paper proposes a new nonlinear multiseale monslrmction method for image enhancement using dual-tree complex wavelet hansfona The enhanced image is obtained by succ&vely combining each coarser d e image with the corresponding nonlinearly modified iniersesle (detail) images. This image enhancement method reduces additive noise wbile presema the sharpnesc of the image. Simulation res...

The aim of image enhancement is to improve the perception of information in images for human viewers, or to provide better input for other automated image processing images. Image Enhancement (IE) transforms images to provide better representation of subtle details. Contrast stretching is an image enhancement technique commonly used for medical images for improving the quality of an image by re...

In this paper, we will discuss the development of the image enhancement techniques and their application in the field of image processing .The principle objective of image enhancement techniques is to process an input image so that the resultant image is more suitable than the original image for specific application. Traditional global histogram equalization usually causes excessive contrast en...

Contrast Enhancement plays an important role in digital image processing. It enables the human and automated perceiver to find out the less obvious information in the original image. Global Contrast Enhancement techniques are used in a wide range of applications to enhance the quality of an image. Local contrast enhancement also plays an important role for a detailed visibility of an image. In ...

Image enhancement is a technique to improve the quality of an image. The aim of image enhancement technique is to improve the interpretability or perception of information in images for human viewers, or to provide better input for other automated image processing techniques. This paper presents a fuzzy grayscale enhancement technique for low contrast image corrupted by Gaussian noise. The degr...

We present a realistic and dynamic simulation method of the needle implantation in brachytherapy. The needle is firstly modeled as a polygon model and then its position and orientation are dynamically and automatically located using a magnetic tracking technology. Two buffers that reserve the result of the volumetric rendering and geometric rendering are mixed in the context of image-level hybr...