Image resolution conversion using a plurality of image registrations
October 31, 2014. 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 ReferencesStatistical resolution conversion technique Apparatus and method for scaling facsimile image data Method for expansion of a digital image Resolution conversion of bitmap images using error term averaging Image processing method and apparatus therefor 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 Pel resolution addressing conversion Method of and apparatus for converting the resolution of an image represented by a pattern of bivalent pixels Graphics scaling method for high resolution printers InventorsAssigneeApplicationNo. 333083 filed on 10/31/1994US Classes:382/299, Raising or lowering the image resolution (e.g., subpixel accuracy)358/451, Picture size conversion382/237Gray level to binary codingExaminersPrimary: Boudreau, Leo H.Assistant: Anderson, Harold D. International ClassG06K 009/42AbstractAn image processing apparatus in a reproduction system includes an image input terminal having a device resolution of K pixels per unit length by L pixels per unit length (K x L). Each pixel is defined at a depth b representing one of b optical densities. The image input terminal emits an input image at the device resolution and depth (KxLxb). A memory is provided for receiving and storing as electrical signals the input image emitted from the image input terminal. A first processing means converts the resolution of the input image to a plurality of output images at a second resolution of M pixels per unit length by N pixels per unit length (M x N). Each pixel is defined at depth d representing one of d optical densities. The first processing means converts the input image to the plurality of output images by spatially offsetting a periodically repeating mapping defining the conversion between the input image and the output image. A second processing means forms a distribution of the plurality of output images. The second processing means selects a composite output image from the distribution of output images and stores the composite output image in the memory. An image output terminal having a device resolution and depth of M x N x d, is adapted for reproducing the composite image stored in the memory.Other References
Field of SearchMinimize discontinuities at boundaries of image blocks (i.e., reducing blocking effects or effects of wrap-around)Minimize jaggedness in edges (e.g., anti-aliasing) Raising or lowering the image resolution (e.g., subpixel accuracy) Gray level to binary coding Quantization Image reproduction system Plural images combined into a single image Picture size conversion Involving both line number and field rate conversion (e.g., PAL to NTSC) Changing number of lines for standard conversion Changing number of fields for standard conversion Window signal generator (e.g., rectangle) | |
