Abstract: Method and apparatus for outline font character generation in dot matrix devices including a point transform engine, a parametric equation generator, an adaptive forward differencing engine, a transition detection engine, a transition processor, an intermediate storage, and a bitmap converter. The point transform engine performs a linear transformation on the input control points to produce a set of control points corresponding to the description of the scaled image. The parametric equation generator computes a set of coefficients used in generating polysegments. The adaptive forward differencing engine generates a set of controlled length vectors representing the image, while the transition detection engine determines the transition pixels by scanning the vectors both horizontally and vertically to determine whether a scanline is crossed by the vector. The transition processor enhances the image quality and alters the number and location of the previously determined transition pixel.

Abstract: Method and apparatus for outline font character generation in dot matrix devices including a point transform engine, a parametric equation generator, an adaptive forward differencing engine, a transition detection engine, a transition processor, an intermediate storage, and a bitmap converter. The point transform engine performs a linear transformation on the input control points to produce a set of control points corresponding to the description of the scaled image. The parametric equation generator computes a set of coefficients used in generating polysegments. The adaptive forward differencing engine generates a set of controlled length vectors representing the image, while the transition detection engine determines the transition pixels by scanning the vectors both horizontally and vertically to determine whether a scanline is crossed by the vector. The transition processor enhances the image quality and alters the number and location of the previously determined transition pixel.

Abstract: A fast vertical scan-conversion and filling method and apparatus for outline font character generation in dot matrix devices including a normalized polysegment generation engine for converting spline data to normalized polysegment data, a vertical scan conversion engine comprised of a decision table transitioner (DT) unit for identifying the location of a transition pixel relative to each polysegment or indicating that an identification cannot be made, intersection transition calculating unit (IT) for calculating the position of a transition pixel relative to each polysegment, and a transition pixel coordinate generating unit responsive to the normalized polysegment data and input received from the DT and IT units and operative to generate signals corresponding to the X and Y coordinates of each transition pixel, and a parity filling engine responsive to the x and y coordinate segment and operative to generate bit mapped character image data for use in driving a bit map print or display device.