Image coding and decoding using coherent codes

• US 4,118,099 A
• Filed: 08/05/1976
• Issued: 10/03/1978
• Est. Priority Date: 08/08/1975
• Status: Expired due to Term

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Weiss, Hermann, Klotz, Erhard, Tiemens, Ulf
• Primary Examiner(s): Corbin, John K.
• Assistant Examiner(s): Lee, John D.
• Application Number:
  US05/711,712
• Time in Patent Office: 789 Days
• Field of Search: 350/3.5, 350/162 SF, 250/313
• US Class Current: 359/24
• CPC Class Codes: A61B 6/025 Tomosynthesis
• CPC Class Codes: G03H 1/06 using incoherent light
• CPC Class Codes: H01F 10/147 with lattice under strain, e.g. expanded by interstitial nitrogen H01F10/26 - H01F10/30 take precedence

Abstract

A method of imaging a three-dimensional object with the aid of coding and decoding using coherent point codes, whereby the object is recorded in two steps, each with a plurality of radiation sources of different orientation on the same recording material.

Negatives of the two images are produced, after which the positive of one image is combined with the negative of the other image, the combined images being subsequently multiplied by means of point holograms formed with the aid of a reference wave and a multiplicity of light sources whose co-ordinates correspond to those of the point images of the two source arrays recorded by a pinhole camera, the two multiplied images being superposed in one plane, the coded images being decoded by changing their scale with the aid of two synchronously controlled zoom lenses whereby the coordinates of the point image function of an image of an object layer in the coded images are adapted to the points stored in the two point holograms.

Claims

1. A method of imaging a three-dimensional object with the aid of coding and decoding using coherent point codes, comprising recording the object with a plurality of radiation sources of different orientations on a recording medium, recording the object again separately with a second plurality of differently oriented radiation sources, forming the negatives of the two recorded images, separately combining the positive of each recorded image with the negative of the other image, to form two combined images, multiplying the combined images by means of point holograms formed with the aid of a reference wave and a multiplicity of light sources whose co-ordinates correspond to those of the point images of the two source arrays recorded by a pinhole camera, superimposing the two multiplied images in one plane, and decoding the coded images by changing their scale with the aid of two synchronously controlled zoom lenses whereby the co-ordinates of the point image function of an image of an object layer in the coded images are adapted to the points stored in the two point holograms.

2. A method as claimed in claim 1, wherein the two coded images are obtained by X-ray flashes on two separate films from different directions, and that the negatives are made by contact printing.

3. A method as claimed in claim 2, wherein the information contained in the X-ray images is displayed on an electron-optical image transducer and the negatives are made by reversing the polarity of the information signal of the transducer.

4. A method as claimed in claim 1, wherein the two coded images are decoded by correspondingly shifting and adding the positives and negatives on an electronic storage tube by bright-dark and dark-bright scanning, respectively.

5. A method as claimed in claim 1 characterized in that the coded images are displayed on an image intensifier tube.

6. An improved method of imaging a three-dimensional object with the aid of coding and decoding using coherent point codes, whereby the object is recorded in two steps, each with a plurality of radiation sources of different orientation on the same recording material, the improvement wherein the two superposition images are separated by means of a grating, but are recorded on a record carrier in a grating-like multiplexed manner as a multiplexed image, a negative of this multiplexed image being made and the superposition images contained in the positive and the negative being spatially separated by way of a second grating and the positive of the one image being separately combined with the negative of the other image forming two combined images, the two resulting combined images being multiplied with the aid of two point holograms stored on a photographic plate, the said holograms being made with the aid of a reference wave and a multiplicity of light sources whose co-ordinates correspond to the point images of the two source arrays recorded by means of a pinhole camera.