Resolution conversion with simulated multi-bit gray
November 25, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesApparatus for image manipulation Enlarged pattern generator Method of and apparatus for changing the pixel density of a binary image using average values calculated from sets of reference pixels selected from the binary image Fast bitonal to gray scale image scaling Image signal processing apparatus with edge emphasis and variable magnification Method of improving CT resolution Graphics scaling method for high resolution printers Resource and memory management algorithms for electric printing and electronic reprographic systems Storage/retrieval system for document Method for making image conversions with error diffusion Patent #: 5226094 InventorsAssigneeApplicationNo. 981678 filed on 11/25/1992US Classes:358/451, Picture size conversion348/576, Selective image modification (e.g., touch up)382/299Raising or lowering the image resolution (e.g., subpixel accuracy)ExaminersPrimary: Powell, Mark R.Assistant: Nguyen, Madeleine Attorney, Agent or FirmInternational ClassH04N 001/393AbstractA method for converting a set of input image pixels having a first resolution and being represented by a set of input image signals to a set of output image pixels having a second resolution and being represented by a set of output image signals. The method is adapted for use in an electroreprographic machine having a memory for storing images and an image output terminal for printing the images. The method comprises the following steps: first, developing a set of state determination rules which govern the conversion of the set of input image pixels having the first resolution to the set of output image pixels having the second resolution; second, communicating the set of input image signals and the set output image signals to the memory, third, relating a plurality of selected input image pixels with a selected one of the output image pixels; fourth, determining respective binary states of the plurality of selected input image pixels; finally, corresponding the selected output image pixel with one of at least three output states by reference to the determined, respective binary states and one of the state determination rules. | |
