SUMMARY This paper presents an algorithm that automatically generates outline fonts from a grey-level image of a character obtained by a scanner. Our algorithm begins by extracting contour points from the image and dividing the points into a number of segments at the corner points. The next step is fitting a piecewise cubic Bézier curve to each segment. To… (More)
SUMMARY This paper presents a method for lossy compression of digital video data by parametric line and Natural cubic spline approximation. The method estimates the variation of pixel values in the temporal dimension by taking group of pixels together as keyblocks and interpolating them in Euclidean space. Break and fit criterion is used to minimize the… (More)
The Curves primitive defined in RenderMan is useful for modelling and rendering ribbonlike objects. This paper gives a simple framework for ray-curve intersection tests in ray tracing, and provides concrete details for one form of the primitive. The form is especially important for fine objects such as hair and fur.