A large number of color image enhancement methods are based on the methods for grayscale image enhancement in which the main interest is contrast enhancement. However, since colors usually have three attributes, including hue, saturation and intensity of more than only one attribute of grayscale values, the naive application of the methods for grayscale images to color images often results in u...

The goal of this paper is to evaluate several extensions of Wei and Levoy’s algorithm [1] for the synthesis of laminar volumetric textures constrained only by a single 2D sample. Hence, we shall also review in a unified form the improved algorithm proposed by Kopf et al.[2] and the particular histogram matching approach of Chen and Wang [3]. Developing a genuine quantitative study we are able t...

A new model-based method is presented for real-time tracking a person’s head in gray image sequences. Multidimensional receptive field histogram and ellipse shape model is used to describe the tracking object (head). A robust nonparametric technique called mean shift algorithm is adopted to estimate the most probable head location in the current frame, in which histogram matching is used during...

As the aerospace industry grows, images obtained from Earth observation satellites have been successfully used in various fields. Specifically, the demand for a high-resolution (HR) optical images is gradually increasing, and hence the generation of a high-quality mosaic image is being magnified as an interesting issue. In this paper, we have proposed an efficient mosaic algorithm for HR optica...

Previous work in our group has described a face recognition technology based on Gabor wavelets based representation and Elastic Graph Matching..4] We here describe a summary of our eeorts towards the Face Recognition Technology (FERET) Phase III test held in February 1997. One of our goals in this test was to improve recognition performance for duplicate facial images. We proposed a model of cu...

Fruit detachment and on-line classification is important for the development of harvesting robot. With the specific requriements of robot used for harvesting strawberries growing on the ground, a fruit detachment and classification method is introduced in this paper. OHTA color spaces based image segmentation algorithm is utilized to extract strawberry from background; Principal inertia axis of...

Based on a local spatial/frequency representation, the spectral histogram of an image is defined as the marginal distribution of responses from a bank of filters. We propose the spectral histogram as a quantitative definition for textons. The spectral histogram model avoids rectification and spatial pooling, two commonly assumed stages in texture discrimination models. By matching spectral hist...

The purpose of this project is to test High Resolution Stereoscopic (HRS) data of SPOT5. This project is done in the framework of the “HRS study Team” international test, supported by ISPRS-CNES. The Digital Elevation Model (DEM) was derived from the HRS data and was evaluated by using a 3D reference data set. The study site for HRS data is located in Manosque, France. It is a countryside lands...

In this paper we propose an image enhancement algorithm that is based on utilizing histogram data gathered from transform domain coefficients that will improve on the limitations of the histogram equalization method. Traditionally, classical histogram equalization has had some problems due to its inherent dynamic range expansion. Many images with data tightly clustered around certain intensity ...

In urban aerial images, shadows cast by culture features due to solar orientation are usually homogenous and among the darkest regions in images and they make the feature under them unrevealed. This paper presents automatic procedures for shadow detection and radiometric restoration of features under cast shadows in color aerial images for solving problems caused by cast shadows in digital imag...