In this paper, we introduce a novel two-stage denoising method for the removal of random-valued impulse noise (RVIN) in images. The first stage of our algorithm applies an impulse-noise detection routine that is a refinement of the HEIND algorithm and is very accurate in identifying the location of the noisy pixels. The second stage is an image inpainting routine that is designed to restore the...

Image-based Relighting (IBRL) has recently attracted a lot of research interest for its ability to relight real objects or scenes, from novel illuminations captured in natural/synthetic environments. Complex lighting effects such as subsurface scattering, interreflection, shadowing, mesostructural self-occlusion, refraction and other relevant phenomena can be generated using IBRL. The main adva...

Most signal processing systems are based on discrete-time signals although the origin of many sources of information is analog. In this work we consider the task of signal representation by a set of basis functions. Presently, without prior knowledge of the signal beyond its samples, no bound on the potential representation error is available. The question raised in this paper is to what extent...

The problem of supervised classification of the satellite image is considered to be the task of grouping pixels into a number of homogeneous regions in space intensity. This paper proposes a novel approach that combines a radial basic function clustering network with a growing neural gas include utility factor classifier to yield improved solutions, obtained with previous networks. The double o...

one of the most famous horticultural exporting products of iran is saffron. at present, the main region for the production of saffron is the northeast region of iran (khorasan-e razavi and southern khorasan provinces). the present research intends to survey the suitable areas for cultivation of saffron in the west of iran (kermanshah and kurdistan provinces) which, in the climatic conditions, i...

Each Discrete Cosine Transform uses N real basis vectors whose components are cosines. In the DCT-4, for example, the jth component of v k is cos(j + 1 2)(k + 1 2) N. These basis vectors are orthogonal and the transform is extremely useful in image processing. If the vector x gives the intensities along a row of pixels, its cosine series P c k v k has the coeecients c k = (x; v k)=N. They are q...

Locally linearly independent bases are constructed for the spaces S r d (4) of polynomial splines of degree d 3r + 2 and smoothness r deened on triangulations, as well as for their superspline subspaces. x1. Introduction Given a regular triangulation 4 of a set of vertices V, let S r d (4) := fs 2 C r (() : sj T 2 P d for all triangles T 2 4g; where P d is the space of polynomials of degree d, ...

This paper presents a method for using objects in a scene to define the reference frame for 3-D reconstruction. We first present a simple technique to calibrate an orthographic projection from four non-coplanar reference points. We then show how the observation of two additional known scene points can provide the complete perspective projection. When used with a known object, this technique per...

In this paper we present a new method to reconstruct reflectance functions for image-based relighting. A reflectance function describes how a pixel in a photograph is observed depending on the incident illumination on the depicted object. Additionally we present a compact representation of the reconstructed reflectance functions. The reflectance functions are sampled from real objects by illumi...

In this paper, we propose a physics-based method to synthesize facial images in visible wavelengths from multi-band near infrared (NIR) images. The study on photometric properties of human skin shows that melanin and hemoglobin components are dominant factors that affect the skin appearance under different light spectrum. Specifically, a set of intensities observed at a certain surface point wi...