Pattern processor controlled illuminator

• US 4,742,555 A
• Filed: 09/30/1986
• Issued: 05/03/1988
• Est. Priority Date: 09/30/1986
• Status: Expired due to Term

• Current Assignee: Pattern Processing Technologies, Inc. (Datalogic S.p.A.)
• Original Assignee: Pattern Processing Technologies, Inc. (Datalogic S.p.A.)
• Inventors: Tonkin, Steven W.
• Primary Examiner(s): Broome, H.
• Assistant Examiner(s): DONOVAN, LINCOLN D
• Application Number:
  US06/913,233
• Time in Patent Office: 581 Days
• Field of Search: 382/50, 382/65, 382/68, 250/222.1, 250/223 R, 250/574, 250/205, 250/221, 358/107, 364/134
• US Class Current: 382/274
• CPC Class Codes: G06K 2207/1018 Source control
• CPC Class Codes: G06K 7/10851 Circuits for pulse shaping, amplifying, eliminating noise signals, checking the function of the sensing device basic electronic circuitry H03
• CPC Class Codes: G06V 10/145 Illumination specially adapted for pattern recognition, e.g. using gratings

Abstract

A controller for operating an illumination source to illuminate selected objects to provide an image to an image transducer so that the illumination occurs at, or approximately at, the moment of time that the image of the object is desired to be acquired. An image signal manipulator receives signals corresponding to the image from the transducer.

Claims

1. A controller for controlling operation of an illumination source for use in intermittently illuminating selected objects to form images thereof on an image reception surface in an image transducer means which in response provides image signals representing said images with said image signals formed on a basis of being able to be used to reconstruct an image therefrom through periodic scanning by reconstructing means of an image reconstruction surface in a predetermined manner under control of said image signals, said image signals having corresponding first direction scanning and second direction scanning marking pulses therein to coordinate such scanning which marking pulses can be represented by a first scanning direction marking signal and a second scanning direction marking signal, respectively, said image signals being provided to an image signal manipulation system for storage and for manipulation therein with there also being an illuminating request signal provided to said controller which provides an indication in each instance that said illumination source is desired to provide illumination, said image transducer means having at least one predetermined portion of each scanning period during which said image transducer means can fail to properly provide said image signals in response to an image occurring on said image reception plane and during which illumination by said illumination source is to be prevented, said controller comprising:

a controller entry means for receiving a first direction controller signal representing at least some parts of said first scanning direction marking signal, for receiving a second direction controller signal representing at least some parts of said second scanning direction marking signal, and for receiving said illumination request signal;

a preventive delay means for receiving from said controller entry means a first entry signal representing at least some parts of said first direction controller signal and for receiving a second entry signal representing at least some parts of said second direction controller signal, said preventive delay means providing a first prevention signal for indications of any occurrances of any said predetermined portions in said scanning periods, and further providing a second prevention signal containing an indication of any occurrance of any said predetermined portions in said scanning periods that has yet to have occur thereafter a corresponding selected change in said first entry signal; and

a decision and directing means for receiving from said preventive delay means said first and second prevention signals and for receiving from said controller entry means a third entry signal representing at least some parts of said illuminating request signal including said indications therein, said decision and directing means providing an illumination initiation signal at a terminal means thereof adapted for connection to said illumination source, said illumination initiation signal indicating that said illumination source is to provide illumination in a substantially immediate response to said indications in said third entry signal but to do so only after any delay imposed as a result of said indication in said first prevention signal, should any such indication in said first prevention signal be occurring coincident with a said indication in said illumination request signal, and said decision and directing means also providing a storage initiation signal to said image signal manipulation system indicating that said image signal manipulation system is to store said image signals from said image transducer means resulting from such illumination in response to said indication in said third entry signal but only after any delay imposed as a result of any said indication in said second prevention signal, should any such indication in said second prevention signal be occurring coincident with a said indication in said illumination request signal.

2. The apparatus of claim 1 wherein said controller entry means further comprises a synchronizing means for receiving said first and second direction controller signals and said illumination request signal, said synchronizing means providing as said first entry signal a synchronized first direction controller signal, as said second entry signal a synchronized second direction controller signal, and as said third entry signal a synchronized illumination request signal, said synchronizing means being capable of having said synchronized first direction controller signal, said synchronized second direction controller signal, and said synchronized illumination request signal each have any logic state changes occurring therein occur only in substantial coincidence with logic state changes occurring in a controller clocking signal.

3. The apparatus of claim 1 wherein said image transducer means has its image reception surface formed by an integrated circuit having photodetectors which can store charges generated by said illumination forming images thereon.

4. The apparatus of claim 1 wherein said illumination is provided by visible light.

5. The apparatus of claim 1 wherein said illumination is provided by infrared radiation.

6. The apparatus of claim 1 wherein said controller provides a signal to said image signal manipulation system after said indication in said storage initiation signal indicating that said image signal manipulation system is to then discontinue storing image signals received from said image transducer means.

7. The apparatus of claim 1 wherein said controller provides a signal to said image signal manipulation system indicating where in said scanning for image reconstruction said indication in said storage initiation signal occurred.

8. The apparatus of claim 2 wherein said controller clocking signal is formed based on signals supplied by said image signal manipulation system.