Image signal interface system

• US 5,359,702 A
• Filed: 10/29/1992
• Issued: 10/25/1994
• Est. Priority Date: 08/31/1988
• Status: Expired due to Term

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation)
• Inventors: Mukai, Hachiro
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): MOHAMED, AYNI Y
• Application Number:
  US07/968,476
• Time in Patent Office: 726 Days
• Field of Search: 395/106, 395/109, 395/131, 358/80
• US Class Current: 358/1.9
• CPC Class Codes: G06T 2207/10081 Computed x-ray tomography [CT]
• CPC Class Codes: G06T 2207/10088 Magnetic resonance imaging [MRI]
• CPC Class Codes: G06T 2207/30004 Biomedical image processing
• CPC Class Codes: G06T 5/40 using histogram techniques
• CPC Class Codes: G06T 5/50 using two or more images, e.g. averaging or subtraction
• CPC Class Codes: G06T 5/92 based on global image properties

Abstract

An image signal interface system includes an A/D converter for converting an analog image signal from one, at a time, of a plurality of image signal sources to digital image data, a table memory for storing as a device table attribute data on the analog image signal from the one of the image signal sources, and a control unit for reading the attribute data from the table memory and controlling the A/D converter based on the attribute data.

Claims

1. An image signal interface system for use between a plurality of image signal sources having different γ

characteristics and a single image output device for producing a hard copy based on an image signal produced by one of the image signal sources at a time, said image signal interface system comprising;

a plurality of selectable γ

correcting tables for converting the image signals from the image signal sources to image signals which match the γ

characteristics of the image output device;

at least one density coefficient table for varying at least the maximum density and contrast of the image signals from the image signal sources;

a lookup table setting unit for converting the image signals from one of the image signal sources according to correction data from said γ

correcting table and said density coefficient table corresponding to said one of the image signal sources such that γ

correction and gradation correction occur simultaneously in said lookup table setting unit; and

control means for initiating transmission of said image signals from said one of the image signal sources and for supplying information from said plurality of γ

correcting tables and from said at least one density coefficient table to said lookup table setting unit.

2. An image signal interface system according to claim 1, wherein said image output device comprises a laser beam printer.

3. An image signal interface system according to claim 1, wherein each of said image signal sources comprises a medical image diagnostic apparatus.

4. An image signal interface system according to claim 1, wherein said image output device comprises a laser beam printer and each of said image signal sources comprises a medical image diagnostic apparatus.

5. An image signal interface system for use between a plurality of image signal sources having different γ

characteristics and a single image output device for producing a hard copy based on an image signal produced by one of the image signal sources at a time, said image signal interface system comprising;

a communication interface for receiving control signals from said image signal sources;

an A/D converter;

a first switch for selectively connecting each of said image signal sources to said A/D converter;

a plurality of device tables containing attribute data corresponding to each of the image signal sources;

a plurality of selectable γ

correcting tables for converting the image signals from the image signal sources to image signals which match the γ

characteristics of the image output device;

at least one density coefficient table for varying at least the maximum density and contrast of the image signals from said one of the image signal sources;

a lookup table setting unit for converting the image signals from one of the image signal sources according to correction data from said γ

correcting table and said density coefficient table corresponding to said one of the image signal sources such that γ

correction and gradation correction occur simultaneously in said lookup table setting unit;

control means for receiving information from said communication interface and said memory means and for controlling said A/D converter with said attribute data and supplying said lookup table setting unit with data from said γ

correcting table and said density coefficient table; and

an output means for reproducing an image based on the image signal from said one of the image signal sources.