| 摘要 |
An image display station provides real time selectively zoomed direct display of a received high resolution image stored in image memory. The memory provides storage of the image input data for making available for pixel processing in each of subsequent clock intervals successive groups of adjacent pixel data values throughout a portion to be displayed of the image. User zoom control, by mouse input, selectively establishes a zoom factor for zooming of the input image. User pan control allows selecting display of desired regions of the zoomed image. User contrast control of the zoomed image is provided also by the mouse. Bilinear pixel processing of the successive groups of adjacent pixel data values is carried out throughout the displayed portion of input data within the time period of a single video display frame in accordance with the zoom factor established by the mouse input for such frame. The processing circuitry utilizes a start position in response to the user pan input for data made available from the image memory to define a displayed region of the zoomed image. The processed groups of data are pipelined and converted to analog form for on-the-fly real time video display with display contrast controlled from contrast data lookup according to the contrast input. Each of successive video frames can have a different such zoom factor and the displayed region of the zoomed image is position-shiftable by the pan input by fractional increments from one video frame to the next.
|
