Picture processing apparatus

• US 4,549,208 A
• Filed: 12/21/1983
• Issued: 10/22/1985
• Est. Priority Date: 12/22/1982
• Status: Expired due to Fees

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Yamamoto, Hiroshi, Iwamoto, Taro, Honma, Kazuo, Nakano, Yoshiyuki, Fujie, Masakatsu, Kamejima, Kohji
• Primary Examiner(s): Britton, Howard W.
• Assistant Examiner(s): Kostak, Victor R.
• Application Number:
  US06/563,789
• Time in Patent Office: 671 Days
• Field of Search: 358/108, 358/87, 358/225, 358/140, 358/88, 340/723, 340/724, 340/727, 355/47, 364/522, 354/94, 354/95
• US Class Current: 348/147
• CPC Class Codes: G06T 3/12 Panospheric to cylindrical image transformations
• CPC Class Codes: H04N 3/2335 with calculating means
• CPC Class Codes: H04N 7/18 Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast

Abstract

A picture processing apparatus for use in recognizing an ambient environment as a picture in accordance with the invention, includes a picture input for receiving a distorted picture of a wide angle of view, a picture processing unit which corrects the distorted picture of the wide angle of view from the picture input into an undistorted picture of the wide angle of view, and a display for displaying the undistorted picture of the wide angle of view produced by the picture processing unit.

Claims

1. A picture processing apparatus for processing a facsimile picture of an ambient environment which is scanned through a wide angle optical system to eliminate optical distortion in the picture that is introduced by the optical system, comprising picture input means for producing a facsimile picture comprised of a plurality of pixels of a wide angle of view of the ambient environment which contains optical distortion introduced by the wide angle optical system, said picture input means being mounted on a movable support means which moves within the ambient environment, picture processing means which corrects the distorted picture of the ambient environment into an undistorted picture of the ambient environment which does not contain the optical distortion introduced by the optical system, said picture processing means having a first picture memory means which stores the pixels of the distorted picture of the ambient environment, a computing means which produces an undistorted picture of the ambient environment by eliminating and compensating the distortion of the picture stored in said first picture memory means for each stored pixel of the distorted picture by computing an address for storage of each stored pixel which will produce the undistorted picture, and a second picture memory means which stores the undistortioned picture produced by said computing means by storing each pixel at the computed address to produce the undistorted picture, display means for displaying the undistorted picture of the wide angle of view from said picture processing means;

and said picture processing means and the display means are installed at a position which is remote from the movable support means, and said picture input means and said picture means are coupled together by communication means.

2. A picture processing system in accordance with claim 1 wherein the storage address of each pixel in the second picture memory means is defined in polar coordinates θ

and R where θ

is the angle between the optical axis and a hypotenuse of a right triangle having two additional sides with the first side extending from the center of a convex mirror which is part of the wide angle optical system to a reflective surface of the mirror which intersects the optical axis and the second side of the triangle being defined by the equation ##EQU3## wherein r is equal to r_o sin θ and

r_o is a radius of curvature of the convex mirror.

3. A picture processing apparatus according to claim 1, wherein said picture input means comprises an optical viewing means which forms a wide angle of view of the ambient environmment, and a television camera which is disposed in a manner to scan an optic axis of said optical viewing means so as to receive the picture of the wide angle of view from said optical viewing means.

4. A picture processing apparatus according to claim 3, wherein said optical viewing means is a mirror which is convex toward said television camera.

5. A picture processing apparatus according to claim 3, wherein said television camera includes means for creating relative movement between said optical viewing means and the television camera.

6. A picture processing apparatus according to claim 3, wherein said optical viewing means is stationary with respect to said television camera except for a movable lens.

7. A picture processing apparatus according to claim 3, wherein said television camera has a variable focusing means.

8. A picture processing apparatus according to claim 3, wherein said optical viewing means comprises a fisheye lens.