Image pickup apparatus capable of high resolution imaging

• US 5,889,553 A
• Filed: 01/21/1997
• Issued: 03/30/1999
• Est. Priority Date: 11/17/1993
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Kaneda, Naoya, Kino, Yoshiki
• Primary Examiner(s): HO, TUAN V
• Application Number:
  US08/792,920
• Time in Patent Office: 798 Days
• Field of Search: 348/218, 348/208, 348/335, 348/36, 348/294, 348/311
• US Class Current: 348/218.1
• CPC Class Codes: H04N 23/58 Means for changing the camera field of view without moving the camera body, e.g. nutating or panning of optics or image sensors
• CPC Class Codes: H04N 25/48 Increasing resolution by shifting the sensor relative to the scene

Abstract

An image pickup apparatus includes an image pickup element for photoelectrically converting an optical image formed on an image pickup plane via an image pickup optical system and outputting a picked-up image signal, a variable optical system for shifting the optical image on the image pickup plane of the image pickup element, a control part for controlling the variable optical system and the image pickup element to pickup a predetermined field of view larger than the image pickup plane of the image pickup element by causing the image pickup element to pickup a plurality of optical images at a plurality of shifting positions of the variable optical system, respectively, an A/D converter for converting picked-up image signals outputted from the image pickup element into digital image signals, a memory for storing the digital image signals outputted from the A/D converter, and a signal processor for combining the digital image signals corresponding to the plurality of the optical images stored in the memory and producing an image signal corresponding to the predetermined field of view.

Claims

1. An image pickup apparatus comprising:

(A) image pickup means for photoelectrically converting an optical image formed on an image pickup plane via an image pickup optical system and outputting a picked-up image signal;

(B) A variable optical system, arranged in said image pickup optical system, for shifting the optical image on the image pickup plane of said image pickup means by deflecting an optical axis of said image pickup optical system;

(C) control means for controlling said variable optical system and said image pickup means to pickup a predetermined field of view larger than the image pickup plane of said image pickup means by causing said variable optical system to shift to a plurality of shifting position and to deflect the optical axis corresponding to the shifting positions and causing said image pickup means to pickup a plurality of optical images at the plurality of shifting positions, respectively;

(D) A/D converting means for converting picked-up image signals outputted from said image pickup means into digital image signals;

(E) memory means for storing the digital image signals outputted from said A/D converting means; and

(F) signal processing means for combining the digital image signals corresponding to the plurality of the optical images stored in said memory means and produced an image signal corresponding to said predetermined field of view.

2. An image pickup apparatus according to claim 1, wherein said variable optical system varies an apex angle of said image pickup optical system.

3. An image pickup apparatus according to claim 2, wherein said variable optical system is a variable angle prism.

4. An image pickup apparatus according to claim 1, further comprising control means for causing said variable optical system to vibrate periodically and causing said image pickup means to pickup images relative to two different positions, as well as causing said memory means to store the images relative to the two different positions.

5. An image pickup apparatus according to claim 4, wherein said control means causes said variable optical system to vibrate periodically within limits of a distance between pixels of said image pickup means and makes it possible to pick up an image indicative of information present between the pixels of said image pickup means.

6. An image pickup apparatus according to claim 5, wherein said control means causes said image pickup means to alternately pick up an image relative to a position occupied by the pixels of said image pickup means and an image relative to a position occupied by areas between the pixels, which images are obtained by causing said variable optical system to vibrate periodically within the limits of the distance between the pixels of said image pickup means, stores the images in said memory means and combines the images to make it possible to pick up an image using pixels the number of which substantially exceeds a total number of pixels of said image pickup means.

7. An image pickup apparatus according to claim 4, wherein said control means causes said variable optical system to vibrate with an amplitude of not less than an entire length of one picture of said image pickup means and makes it possible to pick up an image for a plurality of pictures continuously obtainable in a direction of movement of said variable optical system.

8. An image pickup apparatus according to claim 7, wherein said control means causes said variable optical system to move by a distance equivalent to a total length of the plurality of pictures of said image pickup means, causes said image pickup means to pick up images for the plurality of pictures continuously obtainable in the direction of movement of said variable optical system, stores the images in said memory means and combines the images to make it possible to pick up a wide image which is long in the direction of movement.

9. An image pickup apparatus comprising:

(A) image pickup means for photoelectrically converting an optical image formed on an image pickup plane via an image pickup optical system and outputting a picked-up image signal;

(B) a variable optical system, arranged in said image pickup optical system, for varying an image forming position in the image pickup plane of the optical image made incident on said image pickup means by deflecting an optical axis of said image pickup optical system;

(C) A/D converting means for converting the picked-up image signal outputted from said image pickup means into a digital picked-up image signal;

(D) memory means for storing the digital picked-up image signal outputted from said A/D converting means;

(E) control means for causing said variable optical system to deflect the optical axis in a predetermined direction to pickup a predetermined field of view larger than the size of the image pickup plane and causing said image pickup means to pickup images corresponding to a plurality of different positions of said variable optical system, as well as causing said memory means to store the images corresponding to the plurality of different positions; and

(F) signal processing means for combining picked-up image signals corresponding to a plurality of optical images stored in said memory means to produce an image signal corresponding to said predetermined field of view.

10. An image pickup apparatus according to claim 9, wherein said variable optical system is a variable angle prism for varying an apex angle of said image pickup optical system.

11. An image pickup apparatus according to claim 9, wherein said control means causes said variable optical system to vibrate periodically and causes said image pickup means to pickup images relative to two different positions, as well as causes said memory means to store the images relative to the two different positions.

12. An image pickup apparatus according to claim 11, wherein said control means causes said variable optical system to vibrate periodically within limits of a distance between pixels of said image pickup means and makes it possible to pick up an image indicative of information present between the pixels of said image pickup means.

13. An image pickup apparatus according to claim 12, wherein said control means causes said image pickup means to alternately pick up an image relative to a position occupied by the pixels of said image pickup means and an image relative to a position occupied by areas between the pixels, which images are obtained by causing said variable optical system to vibrate periodically within the limits of the distance between the pixels of said image pickup means, stores the images in said memory means and combines the images to make it possible to pick up an image using pixels the number of which substantially exceeds a total number of pixels of said image pickup means.

14. An image pickup apparatus according to claim 11, wherein said control means causes said variable optical system to vibrate with an amplitude of not less than an entire length of one picture of said image pickup means and makes it possible to pick up an image for a plurality of pictures continuously obtainable in a direction of movement of said variable optical system.

15. An image pickup apparatus according to claim 14, wherein said control means causes said variable optical system to move by a distance equivalent to a total length of the plurality of pictures of said image pickup means, causes said image pickup means to pick up images for the plurality of pictures continuously obtainable in the direction of movement of said variable optical system, stores the images in said memory means and combines the images to make it possible to pick up a wide image which is long in the direction of movement.

16. An image pickup apparatus comprising:

(A) image pickup means for photoelectrically converting an optical image formed in an image pickup plane via an image pickup optical system and outputting a picked-up image signal;

(B) a shake correcting optical system for correcting a shake of an image by varying an image forming position in the image pickup plane of the optical image made incident on said image pickup means by deflecting a direction of an optical axis of said image pickup optical system;

(C) A/D converting means for converting the picked-up image signal outputted from said image pickup means into a digital picked-up image signal;

(D) memory means for storing the digital picked-up image signal outputted from said A/D converting means;

(E) control means for causing said shake correcting optical system to deflect the optical axis in a predetermined direction to pickup a predetermined field of view larger than the size of the image pickup plane and causing said image pickup means to pickup images relative to a plurality of different positions, as well as causing said memory means to store the images relative to the plurality of different positions; and

(F) signal processing means for combining picked-up image signals corresponding to a plurality of optical images stored in said memory means to produce an image signal corresponding to said predetermined field of view.

17. An image pickup apparatus according to claim 16, wherein said shake correcting optical system is a variable angle prism for varying an apex angle of said image pickup optical system.

18. An image pickup apparatus according to claim 16, wherein said control means causes said shake correcting optical system to vibrate periodically within limits of a distance between pixels of said image pickup means and makes it possible to pick up an image indicative of information present between the pixels of said image pickup means.

19. An image pickup apparatus according to claim 18, wherein said control means causes said image pickup means to alternately pick up an image relative to a position occupied by the pixels of said image pickup means and an image relative to a position occupied by areas between the pixels, which images are obtained by causing said shake correcting optical system to vibrate periodically within the limits of the distance between the pixels of said image pickup means, stores the images in said memory means and combines the images to make it possible to pick up an image using pixels the number of which substantially exceeds a total number of pixels of said image pickup means.

20. An image pickup apparatus according to claim 16, wherein said control means causes said shake correcting optical system to vibrate with an amplitude of not less than an entire length of one picture of said image pickup means and makes it possible to pick up an image for a plurality of pictures continuously obtainable in a direction of movement of said shake correcting optical system.

21. An image pickup apparatus according to claim 20, wherein said control means causes said shake correcting optical system to move by a distance equivalent to a total length of the plurality of pictures of said image pickup means, causes said image pickup means to pick up images for the plurality of pictures continuously obtainable in the direction of movement of said shake correcting optical system, stores the images in said memory means and combines the images to make it possible to pick up a wide image which is long in the direction of movement.