Various widely used radar image processing algorithms require considerable computing resources but can take advantage of a parallel implementation. We focus on the Shape-from-Shading (SfS) algorithm in its application to radar images. A given serial version of the SfS algorithm was parallelized and improved to handle large images. We experiment with parallelization techniques such as data decom...

Various widely used radar image processing algorithms require considerable computing resources but can take advantage of a parallel implementation. We focus on the Shape-from-Shading (SfS) algorithm in its application to radar images. A given serial version of the SfS algorithm was parallelized and improved to handle large images. We experiment with parallelization techniques such as data decom...

In most real world application and problems, a homogeneous product is carried from an origin to a destination by using different transportation modes (e.g., road, air, rail and water). This paper investigates a fixed charge transportation problem (FCTP), in which there are different routes with different capacities between suppliers and customers. To solve such a NP-hard problem, four meta-heur...

Received February 11, 1992; revised manuscript received July 24, 1992; accepted October 21, 1992 In previous research (Tech. Rep. 172, University of Southern California, Los Angeles, Calif., 1991) we developed an iterative shape-from-shading (SFS) algorithm that uses a single image, by combining a triangular-element surface model with a linearized reflectance map. In the current research we gen...

Non-contact 3D surface measurement is an important problem for modern industry. Shape from shading (SFS) is a convenient method because it can recover the 3D shape only from one image. But the conventional SFS research has a lot of restriction, such as Lambertian illumination model. If the object isn’t under this model, the precision will decrease quickly. We proposed an improved SFS based on n...

Shape-from-Shading (SfS) is a fundamental problem in Computer Vision. The vast majority of research in this field have assumed orthography as its projection model. This paper re-examines the basis of SfS, the image irradiance equation, under an assumption of perspective projection. The paper also shows that the perspective image irradiance equation depends merely on the natural logarithm of the...

MOTIVATION The distribution of allele frequencies across polymorphic sites, also known as the site frequency spectrum (SFS), is of primary interest in population genetics. It is a complete summary of sequence variation at unlinked sites and more generally, its shape reflects underlying population genetic processes. One practical challenge is that inferring the SFS from low coverage sequencing d...

The abilities to build precise human kinematic models and to perform accurate human motion tracking are essential in a wide variety of applications such as ergonomic design, biometrics, anthropological studies, entertainment, human computer interfaces for intelligent environments, and surveillance. Due to the complexity of the human bodies and the problem of self-occlusion, modeling and trackin...

Watermark is embedded by modifying the third level mid frequency coefficients of the host image with multiple SFs. As many combinations of SFs are possible, it is difficult to obtain optimal solutions by trial and error method. Hence, in order to achieve the highest possible transparency and robustness, optimization of the scaling factors is necessary. This task employs Genetic Algorithm (GA) t...