Method of correcting gradation and image display system employing the same
March 29, 2020. 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 ReferencesColor and brightness tracking in a cathode ray tube display system Apparatus for testing and adjusting color cathode ray tube equipment Method and system in video image reproduction Automated image quality control Imaging apparatus and method using interpolation processing Image forming apparatus Screen brightness control Color correction system of imaging apparatus Method of processing image signal Image processing method and apparatus InventorApplicationNo. 09537679 filed on 03/29/2000US Classes:345/207, Light detection means (e.g., with photodetector)345/204, DISPLAY DRIVING CONTROL CIRCUITRY345/690, Intensity or color driving control (e.g., gray scale)345/589, Color or intensity345/590, Gamut clipping or adjustment345/601, Using look up table348/180, MONITORING, TESTING, OR MEASURING348/189, Testing of image reproducer348/236, Using distinct luminance image sensor348/254, Gray scale transformation (e.g., gamma correction)348/609, Reduction of chrominance luminance cross-talk (e.g., precomb)358/521, Gradation358/525InterpolationExaminersPrimary: Tran, Henry N.Attorney, Agent or FirmInternational ClassG09G 500AbstractThe method of gradation correction of input image data to be displayed on an image display apparatus converts to logarithmic data first characteristic values which represent the display characteristics inherent in the image display apparatus and second characteristic values which represent the desired gradation to be eventually realized with the image display apparatus, respectively, and optionally interpolating both the logarithmic data, constructs a gradation correction table based on both the logarithmic data of the first characteristic values and the logarithmic data of the second characteristic values and performs gradation correction on the input image data to the image display apparatus using the gradation correction table. The image display system displays on the image display apparatus the thus corrected image data on which the gradation correction is performed by implementing the method. The method and system are capable of producing a smooth enough correction LUT (look-up table) to allow gradation correction to be performed in such a way that the image display apparatus will eventually provide the intended display characteristics. Therefore, the system can display a high quality image that has no defects such as artifacts.Other References
Field of SearchLight detection means (e.g., with photodetector)Smooth or continuous Intensity or color driving control (e.g., gray scale) Color or intensity Gamut clipping or adjustment Color processing in perceptual color space Dither or halftone Color MONITORING, TESTING, OR MEASURING Testing of image reproducer Using distinct luminance image sensor Gray scale transformation (e.g., gamma correction) Reduction of chrominance luminance cross-talk (e.g., precomb) Intensity, brightness, contrast, or shading correction Artifact removal or suppression (e.g., distortion correction) Interpolation Gradation Interpolation | |
