In this paper, we address the shape-from-shading problem by training deep networks with synthetic images. Unlike conventional approaches that combine deep learning and synthetic imagery, we propose an approach that does not need any external shape dataset to render synthetic images. Our approach consists of two synergistic processes: the evolution of complex shapes from simple primitives, and t...

Open circuit voltage of a silicon solar cell is around 0.6V. A solar module is constructed by connecting a number of cells in series to get a practically usable voltage. Partial shading of a Solar Photovoltaic Module (SPM) is one of the main causes of overheating of shaded cells and reduced energy yield of the module. The present work is a study of harmful effects of partial shading on the perf...

Shape from shading is an ill-posed inverse problem for which there is no completely satisfactory solution in the existing literature. In this paper, we address shape from shading as an energy minimization problem. We first show that the deterministic approach provides efficient algorithms in terms of CPU time, but reaches its limits since the energy associated with shape from shading can contai...

For over thirty years researchers have been trying to solve the shape from shading problem of determining 3D shape from a single image with a single light source. The basic problem of determining shape from shading is made more difficult due to challenges of light orientation, camera type, ambiguity, multiple materials, and specular highlights. This paper shows how some of these challenges can ...

In this paper we address the problem of retrospective shading correction, which is a necessary pre-processing step in many tasks of image analysis. Eight algorithms are implemented and compared. The performance of the algorithms was analysed firstly; on three sets of differently structured synthetic shaded and shading-free images, and secondly; on two sets of real microscopical images acquired ...

This TR is a review of shading based shape recovery (shape from shading, photometric stereo methods). It reports about advances in appliedwork and about results in theoretical fundamentals. 1 CITR, Tamaki Campus, University Of Auckland, Auckland, New Zealand 2 Computer Science Department, University of Western Australia, Perth, Australia 3 Pathology Institute, Charite, Humboldt University, Berl...

---------------------------------------------------------------------***--------------------------------------------------------------------Abstract Color and texture data have been the primitive image or picture descriptors in substance or content based picture recovery frameworks. In this article, a technique is introduced for image or picture mining taking into account examination of shading...

This paper describes a new architecture for generating smoothly shaded two dimensional images of volume data. This architecture ts into an image synthesis pipeline and uses only simple arithmetic operations and a look-up table to generate two dimensional images in real time. The shading algorithm is an extension of the grey-level gradient algorithm for shading volume data. The shading technique...

Shading information in satellite imagery will give user an immediate appreciation for the surface topography. In this paper, an attempt has been made to reconstruct 3D shape or Depth elevation model (DEM) of satellite imagery using Shape from Shading approach. Three widely used shape from shading algorithms – Pentland‟s Linear approach, Lee and Rosenfeld‟s approach and Horn‟s approach were used...

This paper presents a new system for the generation of video rate images from voxel based volume data, in which novel approaches have been applied to the problems of shading and lighting. The shading algorithm combines a three dimensional 3 3 3 window of voxels with look up table based shading. A restricted lighting and viewing model reduces calculation complexity without greatly affecting medi...