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Page description language to bitmap rasterization using optical imaging memory

In this paper, a technique to convert page description language (PDL) code to a bitmap color image using an optical image memory is discussed. The technique is useful in developing a low cost PDL compatible high resolution graphic printing device for desktop publishing applications. The optical image memory in this discussion is a raster scan addressable device which is write-only in the sense of electrical digital access, and its content is continually accessible by an analog optical mean. Utilizing the low cost optical image memory, the algorithm can rasterize PDL code without large amounts of expensive digital image frame memory. Since the optical image memory is a raster scan addressable device, the rasterization ofeach pixel ofthe color image must be done within the access time of each pixel writing. Some novel techniques are introduced in this algorithm. System development, performance analysis, and the application of the algorithm will be presented.