Method of and apparatus for making video images

• US 4,652,929 A
• Filed: 10/10/1985
• Issued: 03/24/1987
• Est. Priority Date: 12/16/1981
• Status: Expired due to Fees

• Current Assignee: Agfa-Gevaert AG (Agfa-Gevaert N.V.)
• Original Assignee: Agfa-Gevaert AG (Agfa-Gevaert N.V.)
• Inventors: Stemme, Otto, Wagensonner, Eduard
• Primary Examiner(s): Lev, Robert G.
• Application Number:
  US06/786,311
• Time in Patent Office: 530 Days
• Field of Search: 358/214, 358/211, 358/54, 358/215, 358/216, 358/909, 358/213, 385/20
• US Class Current: 348/96
• CPC Class Codes: H04N 1/4092 Edge or detail enhancement
• CPC Class Codes: H04N 1/486 with separate detectors, each detector being used for one specific colour component

Abstract

A method of producing a video picture of an image comprises the steps of lighting the image at a light level equal to about a predetermined small fraction of the light level necessary to produce picture-element signals of an amplitude sufficient to process. The thus lighted image is then scanned and electrooptically reduced to a succession of sets of analog picture-element signals a predetermined number N of times, the number N being equal to the inverse of the predetermined small fraction. Thus for each portion of the image there is a respective picture-element signal in each succession. The signals of each image portion are then projected onto the same portion of a light-sensitive medium to form a picture of the image thereon. This medium is capable of adding each of the signals of each set to the signals of the other sets corresponding to the same image portion.

Claims

1. A method of producing a video picture of an image, the method comprising the steps of:

lighting the image at a light level equal to about a predetermined small fraction of the light level necessary to produce picture-element signals of an amplitude sufficient to process;

scanning the image and electrooptically reducing it to a succession of sets of analog picture-element signals a predetermined number N of times, the number N being equal to the inverse of the predetermined small fraction, whereby for each portion of the image there is a respective picture-element signal in each succession;

providing a light-sensitive medium capable of adding each of the signals of each set to the signals of the other sets corresponding to the same image portion; and

projecting the signals of each image portion onto the same portion of the light-sensitive medium to form a picture of the image thereon.

2. The video picture-producing method of claim 1 wherein N is between 10 and 100.

3. An apparatus for producing a video picture of an image, the apparatus comprising:

means for scanning the image and electrooptically reducing it to a succession of sets of analog picture-element signals a predetermined number N of times, whereby for each portion of the image there is a respective picture-element signal in each succession;

means for lighting the image at a light level equal to about 1/N times the light level necessary to produce picture-element signals of an amplitude sufficient to process;

a light-sensitive medium capable of adding each of the signals of each set to the signals of the other sets corresponding to the same image portion; and

.

4. The video picture-producing apparatus defined in claim 3 wherein the means for electrooptically reducing is a charge-coupled device.

5. The video picture-producing apparatus defined in claim 3 wherein N is equal to between 10 and 100.