Active appearance model is a statistically parametrical model, which is widely used to extract human facial features and recognition. However, intensity values used in original AAM cannot provide enough information for image texture, which will lead to a larger error or a failure fitting of AAM. In order to overcome these defects and improve the fitting performance of AAM model, an improved tex...

For image estimation we use a hyperbolic penalty function. The center of a hyperbola is parabolic like `2 norm fitting. Its asymptotes are like `1 norm fitting. A transition threshold must be chosen for regression equations of data fitting and another for model regularization. We adapt the conjugate direction method to solve this problem in a manner we call the HYCD method. We present examples ...

Infrared imaging spectrometry is utilized to detect and identify targets by collecting spectral images. In some cases, the infrared images of dynamic need be detected accurately, such as during remote sensing target tracking engine tail flame detection applications. However, it difficult obtain reliable measurement results when using a traditional spectrometer with scanning structure because mo...

The problem of fitting a straight line to a planar set of pointsis &considered.; A parameter space computational approach capable offitting one or more lines to a set of points is presented. The suggestedalgorithm handles errors in both coordinates of the data points, evenwhen the error variances vary between coordinates and among pointsand can be readily made robust to outli...

nowadays, radar systems have many applications and radar imaging is one of the most important of these applications. inverse synthetic aperture radar (isar) is used to form an image from moving targets. conventional methods use fourier transform to retrieve doppler information. however, because of maneuvering of the target, the doppler spectrum becomes time-varying and the image is blurred. joi...

In this paper, we present a novel steganographic method for embedding of a secret data in still grayscale JPEG image. In order to provide large capacity of pro– posed method while maintaining good visual quality of stego-image, the embedding process is performed in quan– tized transform coefficients of Discrete Cosine transform (DCT) by modifying coefficients according to modulo function, what ...

This article deals with the problem of the determination of characteristics of imperfect circular objects in discrete images, namely the radius and center coordinates. To limit distortion, a multilevel method based on active contours was developed. Its originality is to furnish a set of geometric envelopes in one pass, with a correspondence between grayscale and a regularity scale. The adequacy...