Non-Photo-Realistic Rendering (NPR) is becoming increasingly important research topic in computer graphics and image processing. This paper puts forward a novel method for automatically generating a pencil sketch from a real 2D color image in non-photo-realistic rendering. First of all, the edge of the color image is detected by Sobel operator. Secondly, the color image is sharpened by Unsharp ...

Observational tests of open-loop ground-layer wave front recovery have been made using a constellation of four natural guide stars at the 1.55 m Kuiper telescope in Arizona. Such tests explore the effectiveness of wide-field seeing improvement by correction of low-lying atmospheric turbulence with ground-layer adaptive optics (GLAO). The wave fronts from the four stars were measured simultaneou...

Denoising the CT images removes noise from the CT images and so makes the disease diagnosis procedure more efficient. The denoised images have a notable level of raise in its PSNR values, ensuring a smoother image for diagnosis purpose. In the previous work, a CT image denoising technique using window-based Multi-wavelet transformation and thresholding has been proposed. The performance of the ...

Image enhancement is used to improve the poor quality of an image to make it useful for human and for machine use. This paper suggests two methods for contrast image enhancement to preserve brightness of an image. This method is applied on 2D histogram. In 2D histogram preserving color value is very important part. Local feature enhancement technique is used to improve local features of an imag...

Bumps, components, clusters and atypical structures from real data often lead to scientific discoveries or reveal interesting phenomena of a population. They are important in astronomy, biology, data mining, bioinformatics and in applications to virtually all natural and social sciences. The wide interest in such structures has in the last decade led to significant developments in each of these...

A strong earthquake of magnitude 6.8 struck the Mediterranean coast of Algeria on 21 May 2003 and the city of Zemmouri in Boumerdes province was most heavily damaged. QuickBird satellite observed the Zemmouri area on 23 May 2003. By image sharpening, buildings, cars and even debris can clearly be identified in a natural colour image. Preliminarily, the present authors performed visual damage in...

Cloud-related shadows represent areas with low illumination conditions that affect remote sensing image quality. In this research, a wavelet-based image sharpening algorithm was developed to enhance shadow areas independently using the defected cloudy image information. The developed algorithm is applied locally by boosting the image high frequency content in the shadow areas using the defected...

Capturing live motion has gained considerable attention in computer animation as an important motion generation technique. Canned motion data comprise both position and orientation components. Although a great deal of signal processing methods are available for manipulating position data, the majority of these methods cannot be generalized easily to orientation data due to the inherent non-line...

Following the discovery of spiral structure in IC3328 (Jerjen et al. 2000), we present further evidence that a sizable fraction of bright early-type dwarfs in the Virgo cluster are genuine disk galaxies, or are hosting a disk component. Among a sample of 23 nucleated dwarf ellipticals and dS0s observed with the Very Large Telescope in B and R, we found another four systems exhibiting non-axisym...

In this contribution I wish to pose a question that emerged from discussions with Dennis Dieks regarding my talk at the Utrecht Workshop. The question is whether a variant of a modal interpretation is conceivable that could accommodate property ascriptions associated with nonorthogonal resolutions of the unity and nonorthogonal families of relative states as they occur in imperfect or genuinely...