Device for the designation of an image

• US 3,996,582 A
• Filed: 07/02/1975
• Issued: 12/07/1976
• Est. Priority Date: 07/08/1974
• Status: Expired due to Term

• Current Assignee: Compagnie industrielle des télécommunications CIT-ALCATEL
• Original Assignee: Compagnie Industrielle des Telecommunications Cit-Alcatel SA
• Inventors: Sinobad, Dusan
• Primary Examiner(s): Trafton, David L.
• Application Number:
  US05/592,776
• Time in Patent Office: 524 Days
• Field of Search: 340/324 A, 340/324 AD, 445/1, 315/367
• US Class Current: 345/16
• CPC Class Codes: G06F 3/04842 Selection of displayed objects or displayed text elements G06F3/0482 takes precedence

Abstract

The invention relates to a device for designating an element of an image in a display assembly. The device comprises a system providing the coordinates of a marked element of the displayed image, comparator receiving the coordinates of the marked element and receiving from a vector generator the moving coordinates of successive elements of the image while refreshed, and a register controlled for load by simultaneous coincidence the two pairs of coordinates for receiving the address of the marked element from an address counter associated with a memory recording the data that define the image. The invention also relates to an assembly for displaying information from a data processor on a scanned display screen.

Claims

1. A device for designating an element of an image, by the address of the information defining this element, in a display assembly which is controlled by a data processor receiving information that defines the image and which includes a processing unit and a cathode-ray unit having a screen, for converting digital signals received from said processor into suitable voltages for displaying the image;

said processing unit including a memory for the image, an address counter for information recorded in said memory, and a vector generator controlled by the latter, said generator producing coordinates of successive elements of the image while refreshed on said screen;

the designating device comprising communicating means between an operator and said processor, for furnishing X and Y coordinates of a datum-marked element of the displayed image, first and second comparators receiving respectively, on the one hand, the coordinates defined by said communicating means and, on the other hand, the coordinates from said generator; and

a register connected to the output of said address counter and controlled for load by the detection of the simultaneous coincidence of the two pairs of coordinates applied to said comparators.

2. An assembly for displaying information from a data processor on a scanned display screen and having an interface for designating an element of the displayed image, comprising a digital processing unit having a memory for storing the information relating to the image to be displayed, an address counter for the information recorded in said memory, a scan control circuit having outputs for controlling the scanning of said screen in dependence upon the stored information, wherein said interface is operative to produce signals representative of the coordinates of an element designated by an operator, the assembly further comprising comparator means for detecting coincidence between the coordinates and said outputs of the scan control circuit, and a register for storing the address in said address counter at the time when the coincidence is detected by said comparator means.