Stereo mensuration method

• US 4,849,912 A
• Filed: 08/03/1987
• Issued: 07/18/1989
• Est. Priority Date: 08/03/1987
• Status: Expired due to Fees

• Current Assignee: Vexcel Imaging Corporation
• Original Assignee: Vexcel Corporation (Microsoft Corporation)
• Inventors: Lee, Scott, Leberl, Franz W., Henrot, Denis, Curry, Sean, Karspeck, Milan, Johns, Bryan
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): Gonzalez, Frank
• Application Number:
  US07/081,144
• Time in Patent Office: 715 Days
• Field of Search: 364/525, 364/524, 364/526, 382/30, 382/34, 382/41, 382/42, 358/88, 358/109, 358/107, 358/93, 358/225, 358/903, 358/285, 358/294, 354/65, 354/106, 354/203
• US Class Current: 702/189
• CPC Class Codes: G01C 11/06 by comparison of two or more pictures of the same area

Abstract

An image digitizing and stereo mensuration system for analyzing hard copy photographic, transparency, paper drawing, radar, and other images, features an improved mensuration frame grabbing system utilizing a reseau grid location reference system in which individual reseau detection and location is automatic. One or more specific sub-areas of a large macro-area stereo image, or an entire large format macro-area stereo image can be digitized, correlated and displayed as a stereo image, such as a three-dimensional display or other stereo overlapping images, on a CRT, graphic display device or the like.

Claims

1. The method of stereo mensuration of a first image on a first object and a second similar image on a second object, comprising the steps of:

positioning said first object under a first solid state camera that has a first two-dimensional array of light sensing elements and first focus lens means for focusing light rays from the image on said first object onto said first array of light sensing elements;

positioning said second object under a first solid state camera that has a second two-dimensional array of light sensing elements and second focus lens means for focusing light rays from the image on said second object onto said second array of light sensing elements;

feeding first image data comprising light intensity sensed by each light sensing element in said first array along the position in said array where each such light intensity is sensed to computer means for storing and processing said first image data;

feeding second image data comprising light intensity sensed by each light sensing element in said second array along the position in said array where each such light intensity is sensed to computer means for storing and processing said second image data;

correlating said first image data with said second image data in the computer means in such a manner as to create a combination data set for creating a composite stereo image comprised of both said first image and said second image data together;

feeding said combination data set to display means connected to said computer means for displaying a composite stereo visual image formed from said combination data set.

2. The method of claim 1, including the steps of positioning first adjustable magnifying lens means between said first object and said first solid state camera for adjusting the magnification of the image from said first object focused on said first array of light sensing elements, positioning second adjustable magnifying lens means between said second object and said second solid state camera for adjusting the magnification of the image from said second object focused on said array of light sensing means, and adjusting said first and second magnification means to obtain size and image matching of the images from said first and second objects in said display of said composite stereo visual image.

3. The method of claim 2, including the step of creating a movable and scaled measuring mark display superimposed on said composite visual image, and moving said measuring mark within said composite stereo visual image display while holding said composite stereo visual image stationary on said display means for mensuration of the composite stereo visual image.

4. The method of claim 3, including the steps of positioning a first transparent reseau plate having a first array of grid marks on said object, positioning a second reseau plate having a second transparent reseau plate having a second array of grid marks on said second object, detecting the spatial positions of grid marks of said first reseau plate in relation to said first array of light sensing elements and feeding said first reseau grid mark image data to said computer means, correlating said spatial positions of said first reseau grid marks with scale distances on the image of said first object, and correlating the spatial position and mensuration scale of said measuring mark with the positions and scaled spatial distances of said first reseau grid marks.

5. The method of claim 4, including the steps of positioning a first transparent reseau plate having a second array of grid marks on said object, positioning a second reseau plate having a second transparent reseau plate having a second array of grid marks on said second object, detecting the spatial positions of grid marks of said second reseau plate in relation to said second array of light sensing elements and feeding said second reseau grid mark image data to said computer means, correlating said spatial positions of said second reseau grid marks with scale distances on the image of said second object, and correlating the spatial position and mensuration scale of said measuring mark with the positions and scaled spatial distances of said second reseau grid marks.

6. The method of claim 5, including the step of making the images on said first and second objects invisible to said light sensors while detecting the spacial positions of said first and second reseau grid marks.

7. The method of claim 6, including the step of making said first and second reseau grid marks invisible to said light sensors while said first and second image data of said first and second objects are being fed into the computer means.

8. A method of stereo mensuration of a first image on a first object and a second similar image on a second object that is a conjugate of the first object image, comprising the steps of:

positioning said first object under a first solid state camera that has a first two-dimensional array of light sensing elements and first focus lens means for focusing light rays from the first image onto said first array of light sensing elements;

positioning said second object under a second solid state camera that has a second two-dimensional array of light elements and second focus lens means for focusing light rays from the second image onto said second array of light sensing elements;

illuminating said first object and feeding first image data comprising light intensity sensed by each light sensing element in said first array along with the position in said array where each such light intensity is sensed to computer means for storing and processing said first image data;

processing said first image data and feeding the processed data from said computer means to display means connected to said computer for displaying a visual image of the portion of the first object image from which light rays are focused onto said first array of light sensing elements moving the first camera over the first object while continuing to display the sequential portions of the first object image focused onto said first array of light sensing elements as the camera moves;

stopping the first camera over a desired portion of the first object, fixing the digital data of the image of the desired portion in the computer memory, and displaying the image of the desired portion on the display means;

illuminating said second object and feeding second image data comprising light intensity sensed by each light sensing element in said second array along with the position in said array where each such light intensity is sensed to said computer means for storing and processing said second image data;

processing said second image data in the computer means merging said second image data together with the image data of said desired portion of the first object, feeding the merged data from said computer means to said display means for displaying a composite visual image comprised of the portion of the second object image from which light rays are focused onto said second array of light sensing elements superimposed on the image of said desired portion of the first object;

moving the second camera over the second object while continuing to display the sequential portions of the second object image focused onto said second array of light sensing elements superimposed on the image of said desired portion of the first object until the second camera becomes positioned over the portion of the second object that is the conjugate of said desired portion of the first object;

stopping the second camera where the image focused on the second camera and the image of said desired portion of the first object come together in a clear conjugation display of the corresponding conjugate of the desired portions of the first and second objects.