We present an extension of the classical Ambrosio-Tortorelli approximation of the Mumford-Shah approach for the segmentation of images with uncertain gray values resulting from measurement errors and noise. Our approach yields a reliable precision estimate for the segmentation result, and it allows to quantify the robustness of edges in noisy images and under gray value uncertainty. We develop ...

An efficient method for fingerprint identification is proposed. Fingerprint comparison is usually based on minutiae matching and the efficiency of the matching method is dependent on the extraction of the minutiae. In this method, a simple process has been adopted, wherein the pixel based information is used. The extraction of minutiae is based on the gray level value of pixels as well the neig...

An accurate, reproducible method for determining the infarct volumes of gray matter structures is presented for use with presently available image analysis systems. Areas of stained sections with optical densities above that of a threshold value are automatically recognized and measured. This eliminates the potential error and bias inherent in manually delineating infarcted regions. Moreover, t...

The 3D-CSC is a general segmentation method for voxel images. One of its possible applications is the segmentation of MR images of the human head. We here propose a self-contained method consisting of preprocessing steps which remove common artifacts from the input image, a 3D-CSC segmentation which partitions the input image into gray value similar, spatially connected regions and a final clas...

The local binary pattern (LBP) provides a simple and efficient approach to gray-scale and rotation invariant texture classification. However, the LBP operator thresholds P neighbors at the value of the center pixel in a local neighborhood and employs a P-bit binary pattern to encode only the signs of the differences between the gray values. Thus, the LBP operator discards some important texture...

A method for detecting human faces in color images is described that first separates skin regions from nonskin regions and then locates faces within skin regions. A chroma chart is prepared via a training process that contains the likelihoods of different colors representing the skin. Using the chroma chart, a color image is transformed into a gray scale image in such a way that the gray value ...

We show that there exists an n-bit cyclic binary Gray code all of whose bit runs have length at least n − 3 log2 n. That is, there exists a cyclic ordering of {0, 1}n such that adjacent words differ in exactly one (coordinate) bit, and such that no bit changes its value twice in any subsequence of n − 3 log2 n consecutive words. Such Gray codes are ‘locally distance preserving’ in that Hamming ...

In this paper, a new construction method of quaternary sequences of even period 2N having the ideal autocorrelation and balance properties is proposed. These quaternary sequences are constructed by applying the inverse Gray mapping to binary sequences of odd period N with the ideal autocorrelation. Autocorrelation distribution of the proposed quaternary sequences is derived. These sequences can...

This paper proposes a chaos-based image encryption scheme where one 3D skew tent map with three control parameters is utilized to generate chaotic orbits applied to scramble the pixel positions while one coupled map lattice is employed to yield random gray value sequences to change the gray values so as to enhance the security. Experimental results have been carried out with detailed analysis t...

A new BICM-ID technique that makes efficient use of a mixture of standard Gray and anti-Gray extended mapping, combined with irregular degree-allocated repetition code with check nodes. It is shown that with the proposed technique, very low rate codes that can achieve turbo cliff at a very low Es/N0 value range can well be designed, and that the EXIT chart analysis and chain simulation results ...