Method for automatically setting signal processing conditions in image input/output system

• US 4,792,847 A
• Filed: 10/30/1986
• Issued: 12/20/1988
• Est. Priority Date: 11/09/1985
• Status: Expired due to Term

• Current Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Shimazaki, Osamu, Urabe, Hitoshi, Shigaki, Takao
• Primary Examiner(s): Groody, James J.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/924,818
• Time in Patent Office: 782 Days
• Field of Search: 358/80, 358/75, 358/76
• US Class Current: 358/521
• CPC Class Codes: H04N 1/4074 using histograms
• CPC Class Codes: H04N 1/4092 Edge or detail enhancement
• CPC Class Codes: H04N 1/60 Colour correction or control H04N1/54 takes precedence
• CPC Class Codes: H04N 1/6027 Correction or control of colour gradation or colour contrast H04N1/6058 takes precedence

Abstract

A method for automatically setting signal processing conditions for respective colors in an image input/output system where a color original is read for color separation by an image input device and input density signals from the input device are then inputted to a signal processing section to be processed in gradation for each color. Then, the process density signals are inputted to an image output device such that the conditions of the original in the form of optional parameters are selected from a set of options and characteristic point parameters which are selected by designating characteristic points on the original to be processed are selected as auxiliary input parameters. Prescanned data from the image input device is processed together with the auxiliary input parameters so as to thereby determine the processing conditions for respective color output density signals.

Claims

1. A method for automatically setting signal processing conditions for respective colors in an image input/output system where a color original is read for color separation by an image input device, input density signals from the input device are inputted to a signal processing section to be processed in gradation for each color, and then the processed density signals are inputted to an image output device, wherein conditions of said original in the form of optional parameters are selected from a set of options and characteristics point parameters which are selected by designating characteristic points on the original to be processed are selected as auxiliary input parameters, and pre-scanned data from said image input device is processed together with said auxiliary input parameters, so as to thereby determine processing conditions for respective color output density signals.

2. A method for automatically setting signal processing conditions to an image input/output system as claimed in claim 1, wherein said auxiliary input parameters have present levels, a level being selected for the original.

3. A method for automatically setting signal processing conditions in an image input/output system as claimed in claim 1, wherein said optional parameters are the tone of said original, the exposure of said original, presence/absence of high-light points, presence/absence of shadow points, types of picture patterns and user preferred finish.

4. A method for automatically setting signal processing conditions in an image input/output system as claimed in claim 1, wherein said characteristic point parameters are the coordinates of high-light points, the coordinates of shadow points, the coordinates of gray points, the coordinates of skin color points, and the coordinates of color designated points.

5. A method for automatically setting signal processing conditions in an image input/output system as claimed in claim 1, wherein said pre-scanned data is processed by preparing cumulative histograms of pixel data.

6. A method for automatically setting signal processing conditions in an image input/output system as claimed in claim 1, wherein said pre-scanned data and said characteristic point parameters are used to obtain the density of the characteristic points.

7. A method for automatically setting signal processing conditions in an image input/output system as claimed in claim 6, wherein color correction coefficients are calculated from said characteristic point density for use as an output parameter.

8. A method for automatically setting signal processing conditions in an image input/output system as claimed in claim 1, wherein sharpness coefficients are used as output parameters based upon said optional input parameters.

9. A method for automatically setting signal processing conditions in an image input/output system as claimed in claim 1, wherein cumulative histograms of pixel data are prepared based upon said pre-scanned data, characteristic point density is obtained based upon said pre-scanned data and said characteristic point parameters, and gradation is calculated based upon said cumulative histograms, said optional input parameters and said characteristic point density to use a gradation tables as output parameters.

10. A method for automatically setting signal processing conditions in an image input/output system as claimed in claim 9, wherein sharpness coefficients are further determined based upon said optional input parameters.

11. A method for automatically setting signal processing conditions in an image input/output system as claimed in claim 10, wherein color correction coefficients are determined from said characteristic point density.