Random scan system

• US 4,858,014 A
• Filed: 06/18/1987
• Issued: 08/15/1989
• Est. Priority Date: 07/21/1986
• Status: Expired due to Fees

• Current Assignee: Isight Incorporated
• Original Assignee: TECHNION RESEARCH AND DEVELOPMENT FOUNDATION, LTD.
• Inventors: Hilsenrath, Oliver, Zeevi, Yehoshua
• Primary Examiner(s): Britton, Howard W.
• Application Number:
  US07/064,088
• Time in Patent Office: 789 Days
• Field of Search: 358/209, 358/217, 358/903, 358/125
• US Class Current: 348/206
• CPC Class Codes: H04N 23/40 Circuit details for pick-up tubes
• CPC Class Codes: H04N 3/30 otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines

Abstract

A two-dimensional video data acquisition system comprising: video detector apparatus for scanning a visual scene; controller apparatus for generating scan pattern instructions; system interface apparatus for selecting at least one scan pattern for acquisition of video data from the visual scene, the scan pattern being selected from a plurality of such patterns in accordance with the scan pattern instructions; and scan-video interface apparatus comprising random scan driver apparatus for generating scan control signals in accordance with the selected scan pattern, the video detector apparatus scanning the visual scene in accordance with the scan control signals to provide an output to the system interface such that an intensity data map is stored therein, the controller apparatus performing data processing of the intensity data map in accordance with a predetermined set of video data characteristics.

Claims

1. A two-dimensional video data acquisition system comprising:

a video detector means for scanning a visual scene;

a controller means for generating scan pattern instructions;

a system interface means for selecting at least one scan pattern for acquisition of video data from said visual scene, said scan pattern being selected from a plurality of such patterns in accordance with said scan pattern instructions; and

a scan-video interface means comprising random scan driver means for generating scan control signals in accordance with said selected scan pattern,

said video detector means scanning said visual scene in accordance with said scan control signals to provide an output to said system interface such that an intensity data map is stored therein, said controller means performing data processing of said intensity data map in accordance with a predetermined set of video data characteristics,

wherein said system interface comprises a read only memory (ROM), a sample system, a random access memory (RAM), a direct memory access controller (DMA), and a serial communication interface.

2. The system of claim 1 wherein said video detector means comprises a vidicon TV cameras.

3. The system of claim 1 wherein said controller means comprises a CPU which receives a scanning strategy for generating said scanning instructions.

4. The systems of claim 1 wherein scan pattern instructions are generated in a predetermined fashion.

5. The system of claim 1 wherein said scan pattern instructions are generated in a real-time fashion.

6. The system of claim 1 wherein said ROM provides storage of a pattern library in which said scan patterns are contained.

7. The system of claim 1 wherein said sample system compares the video output intensity of said video detector to a predetermined threshold value.

8. The system of claim 1 wherein said RAM and DMA provide said intensity data map storage in accordance with the operation of said sample system.

9. The system of claim 1 wherein said serial communication interface provides communication with a host computer for transfer of a scanning strategy to said CPU.

10. The system of claim 1 wherein said scan-video interface comprises a D/A converter and deflection amplifiers for generating said scan control signals.

11. A method of acquiring two-dimensional video data from a portion of a visual scene, said method comprising the steps of:

determining the portion of the visual scene from which data is to be acquired;

selecting at least one scan pattern for a video detector from a plurality of such patterns in accordance with said determined scene portion;

scanning said video detector in accordance with said selected scan pattern;

sampling the video data received from said video detector and storing a portion thereof in accordance with a predetermined intensity threshold value; and

processing said stored video data portion in relation to a predetermined set of video data characteristics,

wherein said sampling and storing step is performed by a sampling system in cooperation with a direct memory access controller (DMA) and a random access memory (RAM).

12. The method of claim 11 wherein said determining step is performed in accordance with a scanning strategy established by a host computer.

13. The method of claim 11 wherein said selecting step is performed by a CPU which selects said scan pattern from a read only memory (ROM) in accordance with said scanning strategy.

14. The method of claim 11 wherein said selecting step is performed in a predetermined fashion.

15. The method of claim 11 wherein said selecting step is performed in a real-time fashion.

16. The method of claim 11 wherein said scanning step is performed by a D/A converter and deflection amplifiers.

17. The method of claim 11 wherein said processing step is performed by said CPU in serial communication with said host computer.