Image blur display device

• US 5,060,007 A
• Filed: 01/22/1991
• Issued: 10/22/1991
• Est. Priority Date: 11/20/1986
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Egawa, Akira
• Primary Examiner(s): PERKEY, WILLIAM B
• Application Number:
  US07/644,408
• Time in Patent Office: 273 Days
• Field of Search: 354/430, 354/219, 354/289.1, 354/289.12, 354/471, 354/474, 358/105, 358/224, 358/222, 350/500
• US Class Current: 396/52
• CPC Class Codes: G03B 17/20 visible in viewfinder
• CPC Class Codes: G03B 2217/005 Blur detection
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/6811 based on the image signal

Abstract

The present patent application discloses an image blue display device in which the image information in a first time is compared with the image information in a second time to detect a changed place, and this place is displayed as the image blur information.

Claims

1. An image blur displaying device comprising:

(A) image signal forming means for forming an image signal of an object to be photographed;

(b) detection means for detecting a change of said image signal caused along time during an exposure time; and

(C) display means for displaying the change of said image signal along time detected by said detection means as an information of an image blur caused during said exposure time.

2. A device according to claim 1, wherein said detection means further comprises comparing means for comparing a first image signal formed in a first time by said image signal forming means with a second image signal formed in a second time by said image signal forming means.

3. A device according to claim 2, wherein said detection means includes comparing means for comparing a first image signal formed in a first time by said image signal forming means with a second image signal formed in a second time by said image signal forming means and said comparing means is arranged to repeat said comparing operation even to an image signal formed by said image signal forming means in a different time than said first and said second times.

4. A device according to claim 3, wherein said comparing means includes adding-up means for adding up the places in which said image signals have changed, and said display means presents a display responding to the output of said adding-up means.

5. A device according to claim 2, wherein said detecting means includes comparing means for comparing a first image signal formed in a first time by said image signal forming means with a second image signal formed in a second time by said image signal forming means and further comprising alarm means responsive to attainment of the output of said comparing means to a predetermined value for producing an alarm.

6. A device according to claim 2, wherein said detection means includes comparing means for comparing a first image signal formed in a first time by said image signal forming means with a second image signal formed in a second time by said image signal forming means and wherein said comparing means includes discriminating means for causing said display means to display the place where said second image signal has changed to a higher brightness than said first image signal as the image blur information.

7. A device according to claim 2, wherein said detection means includes comparing means for comparing a first image signal formed in a first time by said image signal forming means with a second image signal formed in a second time by said image signal forming means and said comparing means includes memory means for storing said first image signal.

8. A device according to claim 1, wherein said display means includes means for displaying a real-time image under a first stroke condition of a shutter release button and displays the change of the image signal along time detected by said detection means under a second stroke condition of the shutter release button.

16. A camera according to claim 7, wherein said display means includes means for displaying a real-time image under a first stroke condition of a shutter release button and displays the change of the image signal along time detected by said detection means under a second stroke condition of the shutter release button.

9. A camera having an image blur displaying device, comprising:

(A) image signal forming means for forming an image signal of an object to be photographed;

(B) detection means for detecting a change of said image signal caused along time during an exposure time; and

(C) display means for displaying the change of said image signal along time detected by said detection means as an information of an image blur caused during said exposure time.

10. A camera according to claim 9, wherein said detection means further comprises comparing means for comparing a first image signal formed in a first time by said image signal forming means with a second image signal formed in a second time by said image signal forming means.

11. A device according to claim 10, wherein said detection means includes comparing means for comparing a first image signal formed in a first time by said image signal forming means with a second image signal formed in a second time by said image signal forming means and further comprising alarm means responsive to attainment of the output of said comparing means to a predetermined value for producing an alarm.

12. A device according to claim 10, wherein said detection means includes comparing means for comparing a first image signal formed in a first time by said image signal forming means with a second image signal formed in a second time by said image signal forming means and wherein said comparing means includes discriminating means for causing said display means to display the place where said second image signal has changed to a higher brightness than said first image signal as the image blur information.

13. A device according to claim 10, wherein said detection means includes comparing means for comparing a first image signal formed in a first time by said image signal forming means with a second image signal formed in a second time by said image signal forming means and said comparing means includes memory means for storing said first image signal.

14. A device according to claim 10, wherein said detection means includes comparing means for comparing a first image signal formed in a first time by said image signal forming means with a second image signal formed in a second time by said image signal forming means and said comparing means is arranged to repeat said comparing operation even to an image signal formed by said image signal forming means in a different time than said first and said second times.

15. A camera according to claim 9, wherein said detection means includes comparing means for comparing a first image signal formed in a first time by said image signal forming means with a second image signal formed in a second time by said image signal forming means and wherein said comparing means includes adding-up means for adding up the places in which said image signals have changed, and said display means presents a display responding to the output of said adding-up means.