Image processing system

• US 5,610,726 A
• Filed: 06/01/1995
• Issued: 03/11/1997
• Est. Priority Date: 10/27/1986
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Cho, Kenjiro, Saito, Seiji, Nonoshita, Hiroshi, Shigehara, Yasuhisa
• Primary Examiner(s): Harvey, David E.
• Application Number:
  US08/456,717
• Time in Patent Office: 649 Days
• Field of Search: 358/164, 358/403, 358/406, 358/408, 358/455, 358/458, 358/460, 358/518, 358/519, 358/521, 358/523, 358/443, 358/448, 358/442, 358/296, 395/109, 395/114
• US Class Current: 358/442
• CPC Class Codes: H04N 1/407 Control or modification of tonal gradation or of extreme levels, e.g. background level

Abstract

There is disclosed an image processing system with variable gamma characteristic, in which gamma correction is not conducted in the image processing but conducted for the output equipment when the result of image processing is released outside.

Claims

1. An image processing system comprising:

input means for entering information including image information of multivalue digital data into said image processing system;

correction means for correcting the image information entered by said input means,

wherein said correction means compensates for an input-output characteristic of said input means being different from substantially 1;

memory means for storing the corrected image information;

transferring means for transferring image information between said memory means and said correction means,

wherein said correction means is provided between said input means and said transferring means, and

wherein the compensation is effected prior to transfer of said image information.

2. A system according to claim 1, further comprising process means for editing the image information stored in said memory means.

3. A system according to claim 1, further comprising processing means for processing the image information stored in said memory means.

4. A system according to claim 1, wherein said system is constituted by a plurality of apparatuses.

5. An image processing system according to claim 1, further comprising:

output means for the output of image information; and

means for effecting a further variation, according to the output characteristic of said output means, on said image information stored in said memory means, for the output of said image information by said output means.

6. An image processing system comprising:

input means for entering tonal image information of multivalue digital data to said image processing system;

output means for outputting image information;

transferring means for transferring image information;

first correction means provided between said input means and said output means for correcting the image information entered by said input means in response to input-output characteristics of said input means and of said output means when said image processing system is in a first state;

second correction means provided between said input means and said transferring means for delivering image information independent of said input-output characteristic of said input means to said transferring means when said image processing system is in a second state; and

third correction means provided between said output means and said transferring means for correcting image information on said transferring means to reflect an input-output characteristic suitable for said output means,

wherein said transferring means connects said second correction means and said third correction means.

7. An image processing system according to claim 6, further comprising:

instruction means for generating an instruction that the image information entered by said input means should be delivered to said output means outside of said transferring means when said image processing system is in one of the first and second states; and

switch means for switching between said first correction means and said second correction means to switch from the first state to the second state, and vice versa so as to deliver the image information entered by said input means in response to the instruction.

8. A system according to claim 6, wherein said system is constituted by a plurality of apparatuses.

9. A system according to claim 6, further comprising process means for editing the image information stored in said memory means.

10. A system according to claim 6, further comprising process means for processing the image information stored in said memory means.