Image data processing apparatus for processing combined image signals in order to extend dynamic range

• US 5,801,773 A
• Filed: 10/26/1994
• Issued: 09/01/1998
• Est. Priority Date: 10/29/1993
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Ikeda, Eiichiro
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): Miller, John W.
• Application Number:
  US08/329,538
• Time in Patent Office: 1,406 Days
• Field of Search: 348/229, 348/216, 348/222, 348/239, 348/241, 348/252, 348/254, 348/257, 348/362, 348/363, 348/365, 348/364, 348/571, 348/576, 348/671, 348/674, 348/677, 348/678, 348/686, 348/207
• US Class Current: 348/229.1
• CPC Class Codes: H04N 2209/049 having three pick-up sensors
• CPC Class Codes: H04N 23/70 Circuitry for compensating brightness variation in the scene
• CPC Class Codes: H04N 23/741 by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors
• CPC Class Codes: H04N 23/84 for processing colour signals
• CPC Class Codes: H04N 5/20 Circuitry for controlling amplitude response

Abstract

An image data processing apparatus includes a controller which matches a dynamic range of image data to be outputted to an output unit to a dynamic range of data and/or to an output characteristic of the output unit so that the data may be processed in the output unit.

Claims

1. An image pickup apparatus comprising:

(a) image pickup means for forming a plurality of image signals having different exposure conditions;

(b) combining means for combining said plurality of image signals to form a combined image signal having an extended dynamic range based on a predetermined algorithm; and

(c) recording means for recording said combined image signal and information regarding said algorithm in a predetermined recording medium.

2. An image pickup apparatus according to claim 1, wherein said combining means switches over said plurality of image signals at predetermined switching points.

3. An image pickup apparatus according to claim 2, wherein said information relates to the predetermined switching points.

4. An image processing apparatus comprising:

(a) reproducing means for reproducing, from a recording medium, a combined image signal and information regarding a combining algorithm, said image signal having been combined using said combining algorithm;

(b) processing means for processing said reproduced image signal using said information to change a dynamic range of said reproduced image signal.

5. An image processing apparatus according to claim 4, wherein said information relates to switching points at which a plurality of image signals are previously switched over to form the combined image signal.

6. An image pickup apparatus comprising:

(a) image pickup means for forming a plurality of image signals having different exposure conditions;

(b) combining means for combining said plurality of image signals to form a combined image signal having an extended dynamic range based on a predetermined algorithm; and

(c) storing means for storing information regarding said algorithm; and

(d) control means for compressing a dynamic range of said combined image signal according to said information.

7. An image pickup apparatus according to claim 6, wherein said combining means switches over said plurality of image signals at predetermined switching points.

8. An image pickup apparats according to claim 7, wherein said information relates to said switching points.