A new algorithm for image quality assessment based on entropy of Gabor filtered images is proposed. A bank of Gabor filters is used to extract contours and directional textures. Then, the entropy of the images obtained after the Gabor filtering is calculated. Finally, a metric for the image quality is proposed. It is important to note that the quality of the image is image content-dependent, so...

More and more low level vision algorithms are being carried out in the spatial frequency domain, using Gabor lters. There are two basic problems concerned with Gabor lterings we will address in this paper. One is the window size problem, in which we will adopt a set of 2D variable window Gabor lters, and compare its performance with those of xed window lters. We will show that the variable wind...

We describe a model for capturing the statistical structure of local amplitude and local spatial phase in natural images. The model is based on a recently developed, factorized third-order Boltzmann machine that was shown to be effective at capturing higher-order structure in images by modeling dependencies among squared filter outputs [1]. Here, we extend this model to Lp-spherically symmetric...

Fingerprint matching is one of the most important problems in Fingerprint Identification System (AFIS). In this paper a new method of the reference point alignment has been presented. A new approach of reference point localization is based on so-called identification masks which have been composed on the basis of analysis of biometric characteristic of human finger. Construction of such masks h...

Gabor representations have been widely used in facial analysis (face recognition, face detection and facial expression detection) due to their biological relevance and computational properties. Two popular Gabor representations used in literature are: 1) Log-Gabor and 2) Gabor energy filters. Even though these representations are somewhat similar, they also have distinct differences as the Log-...

Face location under the environment of illumination chagne is a serious problem, in order to reduce illumination effect, in this paper, we propose a facial feature location method based on improved active shape model (IASM) and Gabor filter to reduce the intensity contrast and to enhance edge information. First, face images are preprocessed by the proposed illumination normalization method usin...

This paper proposes a biologically-inspired feature extraction method, which consists of coarse region segmentation by a resistive-fuse network and feature extraction by Gabor wavelet transforms. Their pixel-parallel VLSI implementation based on the pulse modulation circuit architecture is described, and measurement results of Gabor filter operation by a test LSI chip with 1-D 20-pixels are pre...