Retinal images of three-dimensional scenes often contain regions that are spatially blurred by different amounts, owing to depth variation in the scene and depth-of-focus limitations in the eye. Variations in blur between regions in the retinal image therefore offer a cue to their relative physical depths. In the first experiment we investigated apparent depth ordering in images containing two ...

Depth estimation is a classical problem in computer vision, which typically relies on either a depth sensor or stereo matching alone. The depth sensor provides real-time estimates in repetitive and textureless regions where stereo matching is not effective. However, stereo matching can obtain more accurate results in rich texture regions and object boundaries where the depth sensor often fails....

Texture plays an important role in visual information processing since texture provides useful information about shape, orientation, and depth of the objects. The human visual system utilizes texture without difficulty as one of the visual cues for image interpretation, scene analysis and object recognition. However, to extract and to analyze texture are difficult tasks in machine perception in...

Among the urban societal burdens rolling noise generation from tire pavement interaction and waste stand apart. Many materials can be used in pavements with comparable mechanical performance. Noise-related characteristics such as porosity, sound absorption surface texture, were measured for semi-dense low mixtures using namely: recycled concrete aggregates, crumb rubber, polyethylene terephthal...

In this paper we investigate low-bitrate compression of scalar textures such as alpha maps, down to one or two bits per pixel. We present two new techniques for 4× 4 blocks, based on the idea from ETC to use index tables. We demonstrate that although the visual quality of the alpha maps is greatly reduced at these low bit rates, the quality of the final rendered images appears to be sufficient ...

In this study, some habitat characteristics of Iranian rose (Hulthemia persica) were studied in Gonbad watershed in Hamedan providence, Iran. Soil samples were taken by a systematic randomized method at elevation 2000-2400 m above sea level. Samples were taken from 0-30 cm depth. In the laboratory, N, P, K% and organic matter (OC%), soil acidity (pH), conductivity (EC) and soil texture were det...

Introduction Texture filtering is a critical part in many rendering and post-processing methods. If we do it naively, the fragment shader needs to access the texture memory many times to fetch values in the neighborhood of the processed texel. This article presents an efficient filtering algorithm that minimizes the number of texture fetches. The algorithm is based on importance sampling and al...

This paper presents a novel dynamic terrain multiresolution rendering method by utilizing the capabilities of current generation GPUs. Firstly, the terrain depth offset map texture that represents the appropriate offset values is generated through rendering to texture, which is used to deform terrain in vertex shader. Then in order to accurately represent the fine terrain detail created by defo...

The accurate estimation of soil organic carbon (SOC) storage and determination of its pattern-controlling factors is critical to understanding the ecosystem carbon cycle and ensuring ecological security. The Sanjiang Plain, an important grain production base in China, is typical of ecosystems, yet its SOC storage and pattern has not been fully investigated because of insufficient soil investiga...

medicinal species of mountain’s kelavs, scientifically named (kelussia odoratissmia mozaffar.) is an endemic species in iran. kelussia odoratissima is a perennial species and belongs to the umbelliferae. from the ancient times, the local and nomad societies had believed that the species traditionally have anti-ache, anti-inflation and anti-cough effects. seed and root of this species are boiled...