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    • 4. 发明公开
    • APPARATUS FOR INTERPOLATING VIDEO DATA
    • 用于插入视频数据的装置
    • EP0208784A1
    • 1987-01-21
    • EP85900735.3
    • 1985-01-10
    • YOKOGAWA MEDICAL SYSTEMS, LTD
    • SAKAMOTO, Tomosada Yokogawa Medical Systems, Ltd.
    • G09G1/06A61B10/00G06F3/153
    • G09G5/393G06F17/175
    • A video data interpolating apparatus which is capable of readily processing a large number of interpolation data trains. The apparatus is provided with a plurality of pairs of buffer memories, each pair consisting of two buffer memories adapted to alternatively temporarily store video data trains which are successively given, and an Interpolation circuit. Video data being given is successively written into one of the buffer memories which constitute each of the first and second buffer memory pairs. Keeping pace with this writing operation, the video data train which immediately precedes the data which is being written is read out from the other buffer memory of the second buffer memory pair. Interpolation is carried out between this read data and the video data which is being given, thereby obtaining one or several interpolated video data items. This interpolated video data is written into one of the buffer memories which constitute each of the third buffer memory pral and the buffer memory pairs which are subsequent thereto. in parallel with such writing and reading operations in relation to each of the buffer memory pairs, the value stored in the other memory buffer of each of the first and third buffer memory pairs and the buffer memory pairs subsequent thereto is read out and stored in a video memory.
    • 一种视频数据内插装置,它能够容易地处理大量的内插数据串。 该装置配备有多对缓冲存储器,每一对由适于交替地临时存储连续给出的视频数据串的两个缓冲存储器和插值电路组成。 给出的视频数据被连续地写入构成第一和第二缓冲存储器对中的每一个的缓冲存储器之一。 跟随该写入操作,从第二缓冲存储器对的另一个缓冲存储器中读出正在被写入的数据之前的视频数据串。 在读取的数据和正在给出的视频数据之间进行插值,从而获得一个或多个插值的视频数据项。 该内插视频数据被写入构成第三缓冲存储器pral和随后的缓冲存储器对的每一个的缓冲存储器之一中。 与关于每个缓冲存储器对的这种写入和读取操作并行地,存储在第一和第三缓冲存储器对中的每一个的另一个存储器缓冲器中以及随后的缓冲存储器对中的值被读出并存储在 视频内存。
    • 5. 发明公开
    • Graphics display system and method
    • 用于图形表示的方法和装置。
    • EP0112942A1
    • 1984-07-11
    • EP82306987.7
    • 1982-12-30
    • International Business Machines Corporation
    • Richards, John PeterBresenham, Jack E.Gay, Adrian C.
    • G09G1/16G09G1/06
    • G09G5/42G09G5/393
    • The invention concerns a graphics display system of the kind having a refresh raster display device, a line clipping mechanism for clipping line primitives for viewing in a selected rectangular viewport having horizontal and vertical edges parallel to the X and Y axes respectively of the display area of the display device, and a vector-to raster converter for converting the clipped lines to patterns of discrete pels in a refresh buffer, the vector-to-raster converter including an incremental line drawing mechanism responsive to line information supplied by the clipping mechanism to draw the line starting at one endpoint and proceeding towards the other.
      In such a system, for at least some lines of a kind which have a first endpoint in the viewport and the second endpoint outside the viewport, the clipping mechanism is arranged to avoid calculating the intersection point of the line with the viewport edge intersected by the line, and the vector-to-raster converter is arranged to start the line drawing mechanism at the first endpoint and halt the line drawing mechanism when the currently generated coordinate along the display axis normal to the said viewport edge equals the coordinate of the viewport edge along the same axis.
      In the preferred embodiment the said lines of the kind referred to comprise lines for which the second endpoint lies in an outregion laterally adjacent the viewport and the viewport edge intersected by the line is normal to the stepping axis of the line drawing mechanism, and the vector-to-raster converter is arranged to halt the line drawing mechanism when the number of iterations performed by the mechanism equals the magnitude of the coordinate difference along the stepping axis between the first endpoint and the viewport edge, in particular by forcing the stepping loop count of the line drawing mechanism to the said magnitude.
      The invention also provides a method corresponding to the above system.