The image irradiance of a three-dimensional object is known to be the function of three components: the distribution of light sources, the shape, and reflectance of a real object surface. In the past, recovering the shape and reflectance of an object surface from the recorded image brightness has been intensively investigated. On the other hand, there has been little progress in recovering illu...

The relationships between lightness and brightness responses under the condition that achromatic "surface color " appears and the relationships between perceived illumination and brightness were examined. The Ss were required to make categorical judgments upon both lightness and brightness of the test patches presented on black and white backgrounds and upon the over-all illumination in the vis...

A model of brightness coding is presented which is shown to predict the appearance of a number of classical brightness phenomena. The model is known as MIDAAS which stands for Multiple Independent Descriptions Averaged Across Scale. In common with many other approaches to brightness perception MIDAAS imputes to local feature detectors a central role in the computation of brightness. It also exp...

Most of us are faced overexposing of sunlight problem when it directly hits our cell phones. We cannot see anything and try to block the sunlight to use it. Why not our cell phones do identifying the amount of the light and changing the screen brightness? It’s just an example. There are lots of situations such that constrain users. Since the project contains processing the images according to s...

In this note we describe a method for recursively estimating the depth of a scene from a sequence of images. The input to the estimator are brightness values at a number of locations of a grid in a video image, and the output is the relative (scaled) depth corresponding to each image-point. The estimator is invariant with respect to the motion of the viewer, in the sense that the motion paramet...

In this paper, we present a very accurate algorithm for computing optical flow with nonuniform brightness variations. The proposed algorithm is based on a generalized dynamic image model (GDIM) in conjunction with a regularization framework to cope with the problem of non-uniform brightness variations. To alleviate flow constraint errors due to image aliasing and noise, we employ a reweighted l...

Satellite images are playing a major role in region structure planning, change detection which is used in defense for protection and also used for study and analysis of geographical structures of earth and space. Clouds are challenging issue in most of the satellite imaging based applications since appearance of cloud on input image will be treated as noise. Accurate detection and removal of cl...

One goal of scene understanding is to find the shape and color of surfaces in a scene given a single image. This goal is complicated by the fact that given a particular distribution of illumination sources, local variations of image brightness may be due to local change in surface orientation with respect to the light source (shading), variation of the natural color (albedo) of the surface, or ...

Interoduction: Ultrasound images have often low contrast due to small differences in acoustic impedance between different tissues. Air or gas microbubbles that surrounded by membrane are most of the contrast agents in ultrasound imaging. Problems such as instability in sound pressure and inability in penetrating from the blood vessel into body tissues limited the use of microbubbles into the in...

Charge-transfer effects in photometry with Wide Field Planetary Camera 2 aboard the Hubble Space Telescope are investigated by a comparison of WFPC2 observations with groundbased photometry for the Galactic globular clusters ω Centauri and NGC2419. Simple numerical formulae describing the fraction of lost signal as functions of position on the detector, stellar brightness, and the diffuse sky b...