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.
This paper presents a new hybrid scheme for image data compression using quadtree decomposition and para-metric line fitting. In the first phase of encoding, the input image is partitioned into quadrants using quadtree decomposition. To prevent from very small quadrants, a constraint of minimal block size is imposed during quadtree decomposition.… (More)
In this paper, we propose a framework of " fractal deformation " using displacement vectors based on " extended Iterated Shuffle Transformation (ext-IST) ". An ext-unit-IST is a one-to-one and onto mapping that is extended from a unit-IST, which we have proposed, and is basically defined on a code space. When the mapping is applied on a geometric space, a… (More)