Electronic imaging camera utilizing EPROM memory

• US 4,803,554 A
• Filed: 09/30/1987
• Issued: 02/07/1989
• Est. Priority Date: 09/30/1987
• Status: Expired due to Term

• Current Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Original Assignee: Polaroid Corporation (PLR IP Holdings LLC)
• Inventors: Pape, David D.
• Primary Examiner(s): NOT, DEFINED
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/102,859
• Time in Patent Office: 496 Days
• Field of Search: 358/209, 358/906, 358/909, 358/44
• US Class Current: 348/231.6
• CPC Class Codes: G11C 16/08 Address circuits; Decoders; Word-line control circuits
• CPC Class Codes: G11C 8/12 Group selection circuits, e.g. for memory block selection, chip selection, array selection
• CPC Class Codes: H04N 1/2112 using still video cameras
• CPC Class Codes: H04N 1/2137 with temporary storage before final recording, e.g. in a frame buffer
• CPC Class Codes: H04N 2101/00 Still video cameras
• CPC Class Codes: H04N 2201/0077 Types of the still picture apparatus
• CPC Class Codes: H04N 5/907 using static stores, e.g. storage tubes or semiconductor memories H04N5/91 takes precedence

Abstract

Apparatus and method for electronically recording in rapid succession high resolution still images in digital format utilizing a nonvolatile electronically programmable read only memory (EPROM) module for storing the still images. Digitally formatted image data may be rapidly transferred for storage in the EPROM module by simultaneously transferring binary bit data from a plurality of latches to corresponding ones of a plurality of EPROM circuits which collectively form one of a plurality of groups of EPROM circuits which comprise the EPROM module.

Claims

1. An electronic still image camera comprising:

an image sensing array having a predetermined number of discrete image sensing elements each of which is responsive to incident illumination from a subject to provide an analog information signal corresponding to the intensity of the illumination incident thereto;

an analog-to-digital converter for converting the analog electronic information signals received from said image sensing array to digital electronic information signals such that a separate and distinct digital electronic information signal comprising a plurality of binary bits corresponds to the intensity of illumination incident to each of said image sensing elements;

a buffer memory for temporarily storing the digital electronic information signals received from said analog-to-digital converter;

an electronically programmable read only memory (EPROM) module comprising a plurality of discrete EPROM semiconductor circuits arranged so that each of said discrete EPROM semiconductor circuits may be individually addressed and controlled to receive select binary bits of the digital electronic information signals; and

means for addressing and controlling selected groups of said discrete EPROM semiconductor circuits in an ordered sequence so that the digital electronic information signals which define each still image are stored, respectively, in selected ones of said groups, said means operating to address and control each one of said discrete EPROM semiconductor circuits in said selected group to simultaneously store a different plurality of the binary bits of the digital electronic information signal.

2. The electronic still image camera of claim 1 wherein said EPROM module comprises a plurality of latch circuits connected with respect to said buffer memory to receive therefrom in an ordered sequence the binary bits of the digital electronic information signals, said latch circuits each connecting to a different respective one of said discrete EPROM semiconductor circuits in each of said groups in said module so as to simultaneously input each discrete EPROM semiconductor circuit of said select group with a different plurality of the binary bits of the digital electronic information signals.

3. The electronic still image camera of claim 1 further comprising a regulated voltage supply for providing a regulated output supply voltage to energize said discrete EPROM semiconductor circuits at the maximum allowable programming voltage.

4. The electronic still image camera of claim 3 wherein said regulated voltage supply comprises a non-regulated voltage supply, a precision reference diode serially connected by way of a resistor to said non-regulated voltage supply for providing a precise reference voltage, and means for amplifying said precise reference voltage to provide said maximum allowable programming supply voltage.

5. The electronic still image camera of claim 1 further comprising means for imposing a select data compression algorithm to the digital electronic information signals prior to transmission to said EPROM memory.

6. The electronic still image camera of claim 5 wherein said select data compression algorithm includes a cosine transform.

7. The electronic still image camera of claim 1 further comprising a digital-to-analog converter for converting the digital electronic information signals received from said buffer memory to analog electronic information signals, and a display monitor for converting the analog electronic information signals received from said analog-to-digital converter to a visually discernible display of the still image sensed by said image sensing array.

8. The electronic still image camera of claim 1 wherein said EPROM semiconductor circuits are erasable.

9. A process for electronically sensing and storing a still image comprising the steps of:

sensing scene light with a predetermined number of discrete image sensing elements and providing an analog information signal corresponding to the intensity of illumination incident to each of the discrete image sensing elements;

converting the analog electronic information signals to digital electronic information signals so that a separate and distinct digital electronic information signal comprising a plurality of binary bits corresponds to the intensity of illumination incident to each of the image sensing elements;

temporarily storing the digital electronic information signals; and

finally storing the digital electronic information signals which define each still image in a select one of a plurality of different groups of electronically programmable read only memories (EPROM'"'"'s) in a manner whereby a different plurality of the binary bits of the digital electronic information signals are simultaneously stored in respective ones of the EPROM'"'"'s in the selected group.

10. The process of claim 9 further including the step of latching different binary bits of the digital electronic information signals subsequent to the temporary storage thereof in an ordered sequence and thereafter transferring the latched different binary bits of the digital electronic information signals simultaneously to the EPROM'"'"'s of a select group respectively.

11. The process of claim 9 further comprising the step of energizing the EPROM'"'"'s with a supply voltage regulated at the maximum allowable programming voltage.

12. The process of claim 11 further comprising the steps of regulating the supply voltage to the EPROM'"'"'s by providing a precision reference voltage and subsequently amplifying the precision reference voltage.

13. The process of claim 9 further comprising the step of compressing the digital electronic information signals prior to storage in the EPROM'"'"'s.

14. The process of claim 13 wherein said compressing step includes a cosine transformation.

15. The process of claim 9 further comprising the steps of converting the digital electronic information signals back to analog electronic information signals subsequent to said temporary storage and subsequently converting the analog electronic information signals to a visually discernible display.

16. The process of claim 9 further including the step of erasing the digital electronic information signals stored in said EPROM'"'"'s.