| 摘要 |
A method of displaying texts and graphics on a visual display device which has a screen raster with a predetermined number of pixels in the x-direction and the y-direction and an image repetition memory, the characters to be represented being loaded in contour format from a memory and the raster points (pixels) lying on the contour of each character being determined by means of a raster method (grid walk). In order to achieve a better image quality, a grey representation of the characters is performed by scanning and calculating the character positions one character after the other for the individual characters in a fine raster in which the screen raster is subdivided in the x-direction in m and in the y-direction in n fine-raster pixels (m, n > 1), and by converting each individual character in the fine raster into a run length or bit mapping coding of its outer contour and by combining the respectively m x n fine-raster pixels in each screen-raster pixel of each character by adding their bit values and by assigning the screen-raster pixel a grey value which is a function of the sum, and which is written into the image repetition memory which has a resolution in bits (bit scaling) of at least the number of provided grey values (quarter-byte, half-byte, byte-map memory). <IMAGE> |
