Foremost among the promising imaging performance characteristics of cone-beam CT using flat-panel imagers is the ability to form volumetric images with soft-tissue contrast visibility in combination with sub-millimeter 3-D spatial resolution. Each of these two essential characteristics is intimately related to the spatial-frequency-dependent signal and noise transfer characteristics of the imag...

Introduction: For dynamic studies such as functional MRI (fMRI), to achieve reasonable temporal resolution, spatial resolution and spatial coverage, it is necessary to use an under-sampling technique to speed up data acquisition. There are two effective ways to remove aliasing artifacts associated with under-sampling. One is parallel imaging (1, 2) and the other is the UNFOLD technique (3). Par...

This paper presents several novel structures for conversion between arbitrary sampling rates. The method allows arbitrary number of zeros at multiples of both input and output sampling rates, thus it has both good anti-imaging and good anti-aliasing properties. The novel structures are derived from continuous-time equivalents of CIC and modified comb filters. The implementation can be based on ...

Anti-aliasing in form factor computation and precise determination of shadow boundaries are important issires for Radiosity method. A-Buffer is a technique introduced by Carpenter f o r anti-aliasing in hidden surjiace removal. In this paper, we propose a method based on the A-Bilffer to replace the Zbtlffer in the computation of form factors using the Hemicube f o r anti-aliasing. The method d...

An adaptive amplitude distortion effect for audio production is introduced. We consider a versatile model of multiband waveshaping with a limited set of intuitive parameters. We propose a method for adaptive scaling of the characteristic amplitude distortion transfer function. A number of methods to automate other distortion parameters are explored, such as automatic balance between clean and d...

This paper presents an area-filtering algorithm for antialiasing technique of computer graphics images. It can be applied to low-resolution image, which the aliasing effect is more visible. Unlike supersampling technique, which costs too much to do well, this technique is simple and suitable for VLSI implementation. Without changing the current PC-based graphics-hardware architecture, this ‘tec...

In this paper we introduce a method for acceleration of the real time ray tracing by using characteristic traits of visual perception. Ray tracing is a demanding rendering technique which is much slower than currently dominating scanline methods. Performance hit especially arise when we use huge amount of samples for anti-aliasing or other sample-based effects. We show how to decreases number o...