Digital Computer Transformations for Irregular Line Drawings
NEW YORK UNIV BRONX DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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The report describes a parametric quantization scheme for irregular line drawings. With this scheme, different quantized versions of the same drawing can be obtained by changing the values of the parameters. Three figures of noise are proposed for evaluating the quality of quantized drawings and design formulae are developed for the parameters of the quantization scheme as functions of bounds on the figures of noise. The degradation of the quality of a quantized drawing resulting from a coordinate transformation and requantization is studied in terms of transformed figures of noise. Also, it is shown theoretically and by means of a number of examples how to choose the parameters of the quantization scheme in order to meet the requirements on the transformed figures of noise. This enables one to quantize a preprocessed satellite picture so that after computation of a Mercator projection, the resulting geographic map will have the required quality. The theory presented in this report is applicable to any irregular line drawing and to any transformation defined by a pair of functions that are continuous together with their partial derivatives.
- Computer Programming and Software
- Computer Hardware