Abstract: From a display memory, an image scaler retrieves display data representing an image, and produces a data stream representing a scaled version of the image. Based on the data stream, a digital-to-analog converter produces display signals suitable for displaying the scaled version on as a full-screen image on a display screen. Optionally, the scaled version is displayed in a window on the display screen. Characteristics of the scaled version are based on input signals intercepted from a keyboard and a pointing device by an input interception program. For a pointer displayed on the display screen for the pointing device, logical and visual pointer positions are determined based on the input signals and the characteristics of the scaled version.

Abstract: An initial magnified image is generated using a lowpass magnification filter. The resulting image will generally have smaller image data gradients than the original image. Portions of the image that the user, or an application, want to sharpen are selected, and the corresponding portions of the original image data are highpass filtered by one or more highpass filters to generate sharpening data. The initial magnified image data and the sharpening data are combined to generate a sharpened magnified image. In a preferred embodiment, two highpass filters are used, and a distinct sharpening parameter is used to scale the coefficients in each of the two highpass filters. The sharpening parameters are user selectable. This gives the user greater control over the image sharpening process than use of a single highpass filter.

Abstract: An image display apparatus has a synchronizing signal decimation circuit for performing decimation of vertical synchronizing signals, an image decimation circuit for performing decimation of image data, an image scale-up circuit for scaling up the decimated image data, a display panel for displaying an image, a driving circuit for causing the display panel to sequentially display individual frames of image according to the scaled-up image data in synchronization with the decimated vertical synchronizing signals, and a controller having information of a scaling factor of the image scale-up circuit, vertical synchronizing signals to be discarded by the synchronizing signal decimation circuit, and image data to be discarded by the image decimation circuit. The controller controls operation of the synchronizing signal decimation circuit, the image decimation circuit, the image scale-up circuit, and the driving circuit according to the information.

Abstract: An image magnifying method and apparatus magnifies a portion of an image displayed on a computer display device. The user of the computer selects a first region (called a magnification window) of the displayed image, for instance using a mouse or trackball pointer device. Image data from the screen buffer for the user selected magnification window is copied to a first buffer. A magnified image is generated from the copied image data and the magnified image is stored in the screen buffer so as to replace the copied image data. When the user moves the screen cursor, or otherwise selects a second magnification window that overlaps with the first, the magnification application copies image data for a combined window, covering both the first and second magnification windows, from the screen buffer to a second buffer.

Abstract: A video signal processing circuit includes an input processor configured to modify an input video signal in accordance with image magnification data and a buffer memory for storing the modified video signal. The processing unit also includes a write control unit configured to control a write function to the buffer memory by generating a write control signal in accordance with the image magnification data. The write control unit includes a calculating circuit configured to calculate image size data on the basis of the write control signal in response to a change in the image magnification data. The write control unit also includes an inhibition circuit configured to inhibit the write function to the buffer memory at least while the calculation circuit calculates the image size data. The processing unit further includes a read control unit for controlling reading from the buffer memory in accordance with the calculated image size data. A method of processing a video signal also is disclosed.

Abstract: A method of displaying a zoomed version of stored image on a display, where the stored image is defined by a set of data entries mapped to respective pixels of the display. The stored image is first scaled relative to the display in accordance with the desired zooming ratio. The scaled image is then located at an initial position relative to the display and the extent to which each display pixel is overlapped by features of the scaled image is determined. A color tone is assigned to each display pixel in accordance with the extent of the overlap. The scaled image is then shifted relative to said initial position one or more times and, for the or each shift, the overlap of each display pixel is recalculated and a new color tone assigned. The sets of assigned color tones are then displayed cyclically on the display to produce a displayed image.

Abstract: There is disclosed a resolution conversion apparatus for converting an original digital image into a digital image having a different number of pixels in accordance with an instructed conversion magnification factor. In the apparatus, a determination circuit determines the number of pixels to be interpolated in each block of the original image and positions where they are interpolated in accordance with the conversion magnification factor. The block includes a predetermined number of pixels of the original image. A converted image generation circuit generates pixel data for the interpolation pixels at the positions where they are interpolated in accordance with a predetermined interpolation equation whose coefficients are determined with the positions and data values of the pixels in the block, and combines the pixel data for the digital original image and the generated pixel data to output a converted digital image. The interpolation equation includes spline functions and Bezier functions.

Abstract: A method comprising constructing virtual (Discrete Wavelet Transform) DWT sub-bands from an image by performing the DWT and then applying an inverse DWT upon the virtual sub-bands, the result of the inverse DWT representing an up-sampled version of the image. In an alternate embodiment, an apparatus comprising a computer readable medium having instructions which when executed perform constructing virtual (Discrete Wavelet Transform) DWT sub-bands from an image by performing a DWT upon the image, applying an inverse DWT upon the virtual sub-bands, the result of the inverse DWT representing an up-sampled version of the image.

Abstract: A method and apparatus is provided for interpolating a digital image in response to a requested degree of sharpness. An adjusting signal representing the requested degree of sharpness will then be generated. The interpolated pixel data are computed based on a two-order interpolation function for two sampling input pixels with an adjustable weight coefficient representing the selected degree of sharpness. The apparatus of the present invention mainly includes: a control interface, a control unit, a vertical interpolation computation module, and a horizontal interpolation module. The vertical interpolation computation module and the horizontal interpolation module are implemented according to an interpolation function derived by the present invention. The control unit comprises a lookup table built according to a scaling function of the present invention.

Abstract: An image display system includes a host side for executing an application and transmitting image data having a P dot width in a block unit with the number of m dots as the width of the block. A panel side is connected through a digital I/F line to the host side, which converts the image data having a P dot width by using magnification to produce data having an R dot width and then displays the image data. The panel side executes scaling by using a block having an integral value obtained by a R×m/P set as a dot width and a block having a dot width of an added integral value obtained by adding 1 to the integral value, and converts by magnification the image data received from the host side in block unit based on the executed scaling and displays the image data on a panel.

Abstract: A method of expanding an image stored in a first array including the steps of separating the first array into a plurality of rows, each row having a first plurality of data elements, each element having a value, and separately expanding each row from a first plurality of data elements in the first array to a second plurality of data elements in a second array including the steps of correlating each of the first plurality of data elements to at least one of the second plurality of data elements, and distributing the value of selected elements of the first plurality of data elements to correlated data elements of the second plurality of data elements.

Abstract: An image display device includes a display panel having predetermined numbers of pixels defined in horizontal and vertical directions, respectively, and an interpolated-data generation circuit whereby an expanded image data is produced in such a manner that when the number of pixels in the horizontal direction of the display panel is greater than the number of pixels in the horizontal direction of a given image signal, the interpolated-data generation circuit directly stores a plurality of image data A, B, C, D, E of the original image signal along one horizontal line at data storage locations closest to the original locations, and data at data storage locations remaining after storing all original data are given the results X, Y, and Z obtained by calculation from two original image data at locations adjacent to the respective remaining data storage locations thereby expanding the original image signal to have a resolution well matched to the resolution of the display panel without causing a reduction in con

Abstract: As various objects, images, etc. are selectively enlarged or reduced in size on a screen using a zooming operation, at least three marks are displayed to provide a visual indication of the limits for zoom-in and zoom-out operations. The first and second marks indicate limits for enlarging and decreasing a picture, respectively, while the third mark indicates a position of the current screen display with respect to the displayed limits for the zoom-in and zoom-out operations.

Abstract: A method for selecting a graphics primitive in a drawing prepared on a computer includes steps of setting an enlargement display area wherein enlarged display is provided and a compression display area wherein compressed display is provided in a graphics primitive display area, extracting graphics primitive data present in the set enlargement and compression display areas, dividing the-extracted graphics primitive data into a plurality of vector data for the set respective enlargement and compression display areas, and subjecting the divided vector data to coordinate transformation to enlarge or compress the graphics primitive data, thereby displaying graphics primitive data on an enlargement display area.

Abstract: A method for enlarging a digital image includes selecting an initial image having a size N×N; determining a low frequency portion and a high frequency portion of the initial image; defining a model image having fixed bounds for each pixel therein; estimating a final image having a size pN×pN; determining a low frequency portion and a high frequency portion of the estimated final image; determining a pN×pN FFT; replacing the low frequency portion of the estimated final image with the low frequency portion of the initial image to form an intermediate estimated image; and modifying the intermediate estimated image by I-FFT to form a modified estimated image, correcting each pixel in the modified estimated image by a corresponding pixel in the model image to limit variation from the model image until the pixels of a final image are within the bounds of the model image.

Abstract: Displaying a set of characters in a size larger than characters already accepted and displayed in the system. A method for accepting input in a system. The method includes receiving a set of user inputs associated with a set of characters. The set of characters is displayed in size larger than characters already accepted and displayed in the system. A user selection of at least a character from the set of characters is received. In response to the user selection, the character is displayed in a size generally corresponding to characters already accepted and displayed by the system. According to one embodiment of the invention, the set of characters comprises kanji. An embodiment of the invention includes a computer system including a display, a user input device, a memory including a data structure that associates sets of user inputs with respective sets of characters, and a computer executable code.