CA1090120A - Device for scanning adjacent profiles in stereo photographs - Google Patents
Device for scanning adjacent profiles in stereo photographsInfo
- Publication number
- CA1090120A CA1090120A CA281,058A CA281058A CA1090120A CA 1090120 A CA1090120 A CA 1090120A CA 281058 A CA281058 A CA 281058A CA 1090120 A CA1090120 A CA 1090120A
- Authority
- CA
- Canada
- Prior art keywords
- raster
- servo
- light
- scanning
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C11/00—Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
- G01C11/04—Interpretation of pictures
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Facsimile Scanning Arrangements (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A device for scanning adjacent profiles in stereo-photographs is particularly used in differential rectification operations including automatical image correlators. Such a device permits when dynamically operated a high scanning speed due to the flying spot raster control employed for scanning.
The control is effected by a d.c. tachometer which, connected to a servo-motor for performing advance operations, supplies signals proportional to the scanning direction and scanning speed. Said signal is superimposed to the voltage which deflects the raster generating cathode rays so that one is capable of additionally deflecting the raster in advance direction. The raster control permits an on-line dynamic operation between a differential rectifier and a stereo plotter.
A device for scanning adjacent profiles in stereo-photographs is particularly used in differential rectification operations including automatical image correlators. Such a device permits when dynamically operated a high scanning speed due to the flying spot raster control employed for scanning.
The control is effected by a d.c. tachometer which, connected to a servo-motor for performing advance operations, supplies signals proportional to the scanning direction and scanning speed. Said signal is superimposed to the voltage which deflects the raster generating cathode rays so that one is capable of additionally deflecting the raster in advance direction. The raster control permits an on-line dynamic operation between a differential rectifier and a stereo plotter.
Description
1 This invention concerns a device for scanning adjacent profiles in stereo photographs, including an automatic image correlator comprising at least one light source for producing two identical light paths. An optical imaging system, an image plane, a further optical imaging system and a light electric detector are subsequently arranged, considered in the direction of light propagation, in each of said light paths. The image plane is connected via respective means to three servo-motors which adjust the former with respect to height, to advance and to a direction at right angles to the advance direction.
The light electric detector is connected via the image correlator to the servo-motor which controls the height. The inventional device is used in differential rectification --operations.
Previous devices for differential rectification of aerial photographs including an automatic image correlator permit an automatic positioning of a measuring mark relative to a model surface when in static operation. -~
Static operation is to be understood throughout the - -specification as an adjustment operation with respect to the height of a measuring mark relative to a stereo-model, whereas in dynamic operation said mark is additionally dis-placed in a plane at right angles to the height coordinate.
In said devices the center of a light generated raster coincides with the measuring mark of a photogrammetric plotter.
When in dynamic operation the displacement of the measuring mark involves an offset in the image correlator.
Such an offset can be compensated for by additionally dis-placing the stored model profiles relative to each other in the event of an off-line operation between the differential 1~9~ 0 1 rectifier and the stereo plotter, that is, when the photographing of the model surface and the plotting operation are carried out separately and the model profiles obtained are temporarily stored.
This, however, requires a storage which implies considerably high costs with respect to equipment, apart from the longer time necessary for the evaluation operation.
In the event of an on-line dynamic operation between the differential rectifier and plotter the offset causes 0 distortions of neighbouring image details due to the lateral tilt. To cope with this disadvantage the scanning speed of the measuring mark has to be considerably reduced.
It is an object of the present invention to obviate the above disadvantages.
It is a further object of the present invention to provide a differential rectifier in combination with an automatic image correlator of high scanning speed concerning the com-pensation of distortions occuring when dynamically operated.
~ It is still a further object of the present invention to include a scanning control in a differential rectifier for scanning adjacent profiles in stereo photographs. These and other objects of the invention are realised in connecting an advance control servo-motor via a d.c. tachometer and via a ~ scanning generator and a deflection unit to a light source.
It is still a further object of the present invention to provide a device for scanning adjacent profiles in stereo-couples of photographs comprising at least one light source, being provided with a screen, a raster generating and controlling means for producing and controlling a flying spot raster on ~ said screen, the controlling means being connected to the light ,....
1()9t~1~0 1 source, at least one light beam being emitted from the raster, in each of the light beams being arranged, there being at least one optical imaging means, a photograph, and at least one light electric detector, the optical imaging system being for imaging the flying spot upon the photograph, and the light electric detector being for scanning the photograph and for converting the light signals into electric scanning signals, -a correlator for comparing the scanning signals produced by the light-electric detectors, a first and a second servo-motor, the first servo-motor being electrically connected to the correlator and to the light electric detector and being for adjustment of the height of the raster, the second servo-motor being for displacing the raster in a first direction at right - -angles to the height adjustment direction, a d.c. tachometer for generating a directional d.c. voltage, the d.c. tachometer being electrically connected to the second servo-motor and to the raster generating means for effecting a displacement of the raster in a second direction in additional to the first direction, a third servo-motor being for displacing the raster at right angles to the height adiustment and to the first direction, the first, second and third servo-motors being for performing relative displacements between each path of rays and the respective photograph allocated thereto.
In this manner displacements of adjacent scanned profiles in differential rectification are eliminated. In order that the invention may be more readily understood reference is made to the accompanying drawings which illustrate diagrammatically and by way of example three embodiments - thereof and in which:-Fig. 1 is a schematic view of a previous art device to illustrate the mode of operation, ll)901~0 1 Fig. 2 is a schematic view of the operation of the inventional device, Fig. 3 is a schematic view of a further embodiment according to the invention, Fig. 4 is still another schematic view of an embodiment of the invention, and Fig. 5 is a block scheme of a scanning control of the present invention.
In Fig. 1 a cathode ray tube 1 is displaceably arranged about the x-, y-, z-axis of a coordinate system 3 set up on a profile of a stereo-model 2 above which a projector 4 having an image plane 5 is located. The x-axis is at right angles to the drawing plane and therefore not represented. A not shown electronic unit generates a flying spot raster 6, having a center 7 on the screen of the cathode ray tube 1, The cathode ray tube 1 is displaceable in the y-direction to scan the stereo-model 2 by means of the raster 6.
In the course of this scanning operation, an automatic height adjustment of the cathode ray tube 1, and hence of the raster 6 relative to the stereo-model, is carried out in the z-direction.
Due to the lagging error involved in the height adjustment of the cathode ray tube 1, a height difference az occurs between the raster center 7 and a measuring mark 8 of an optical evaluation device (not shown for reasons of greater simplicity), which both, center 7 and mark 8r lie one above the other upon a straight line identical with the z-axis.
Therefrom a displacement ay of neighbouring model stripes results when they are projected into the image plane 5. This evident when considering the points of impingement of the projection beams 55 and 56 in the image plane 5. In contrast to 1091~1~0 1 Fig. 1, Fig. 2 displaces the raster center 7 in the y-direction so that the raster center 7 does not any longer coincide with a measuring mark 8 but advances the latter in the scanning direction. In this manner displacement errors ~y are eliminated at the presence of displacement errors ~z.
In Fig. 3 a cathode ray tube 9 being provided with a screen 9' is displaceable about an x-, y-shaft 10, 11 which corresponds to the z-, y-axis of the coordinate system 3 of Fig. 1. For the sake of greater simplicity, the servo-motor and shaft for displacement of the cathode ray tube 9 in the x-direction are omitted.
t~ ~
B The raster 12 generated oni~ screen 9' of the cathode ray tube 9 emits corresponding rays, in one portion of which a projector 13 with an image 14 is arranged followed by a light-electric detector 15, and in the other portion of the rays a projector 16, with an image 17 followed by a light electric detector 18 is located.
The individual images 14 and 17, respectively, are -formed in the image planes of the projectors 13, 16, respectively.
The two light-electric detectors 15, 18 are connected via mechanical control means 57, 58-to the cathode-ray tube 9 and electricaL~ to an electronic correlator 19 which controls via a servo-motor 20 the shaft 10. A servo-motor 21 is connected via a d.c. tachometer 22 and an amplifier 23 to the cathode ray tube 9. A vidicon 24 is electrically connected to the electronic correlator 19. In the path of rays of the former an optical imaging system 25, a slit aperture 26 and a film reel 27 are arranged.
- The two images 14, 17 with the projectors 13, 16 are oriented relative to each other to form a stereo-couple. The light pulses emitted from the cathode ray tube 9 raster 12 and, 10~01'~0 ¦~ 1 directed via the projectors 13, 16 and the image planeq ~, 17 to impinge upon light electric detectors 15 and 18 are con-verted by the latter into corresponding electric pulses. These are compared as to their phase position in the electronic correlator 19, where a differential signal is formed, if any, which in turn is fed into the servo-motor 20 to effect by operation of the latter via the shaft 10 a displacement of the cathode ray tube 9 along the z-direction, until the two phases are balanced. The scanned terrain surface section, that is, the image section, is reproduced on the vidicon 24 connected to the - electronic correlator 19. The reproduced image section is projected via the optical imaging system 25 and through the slit aperture 26 on to the film reel 27 or any other suitable recording means.
A servo-motor 21 automatically displaces the cathode -ray tube 9 along the spindle 11 in the y-direction which corresponds to an automatic scanning of the image planes 14, 17. The film reel 27 is synchronously rotated. The d.c.
tachometer 22, connected to the servo-motor 21, supplies a directional d.c. voltage proportional to the scanning speed in the y-direction via the amplifier 23. The voltage is applied to the cathode ray tube 9 where the former is superimposed to the deflection voltage which is necessary to generate the!raster.
This d.c. voltage serves to advance the raster in the y-direction, as explained in connection with Fig. 2.
In Fig. 4, the cathode ray tubes 28, 29 are non-displaceable light sources, each of which produces a light path (not shown) so that in the resulting two light paths the following components are arranged; first optical imaging systems 30 and 31 respectively, stereo-couple of photographs 32, 33 in 10901~() 1 the corresponding image planes and second optical imaging systems 34, 35.
The projectors 32 and 33 are displaceable about a coordinate system x', y' and x", y" respectively. The light beams emitted from the cathode ray tube 28, 29 are detected by the respectively coordinated light electric detectors 36, 37 which in turn are connected to an electronic correlator 38 to control a servo-motor 39.
The displacements of the stereo-couple of photographs 32, 33 are accomplished in cooperation with mechanical dis-placement means 42 by operation of servo-motors 40, 41 and as mentioned hereinabove by servo-motor 39. An electric connection is established between the servo-motor 40 and the cathode ray tubes 28, 29 via a d.c. tachometer 43 and a raster generating and deflection unit 44.
The path of light beams originating from the cathode ray tubes 28, 29 and arriving at the photodetectors 36, 37 are indicated by the axes 59 and 60 respectively. The rasters 45, 46 produced by operation of the raster generating unit 4 upon the respective cathode ray tube 28, 29 screens are imaged through the imaging systems 30, 31 into the projector image planes 32, 33 to scan the latter, and from whence to the respective light electric detectors 36, 37 via the second optical imaging systems 34, 35.
The light pulses which have been modulated by the stereo-couple of photographs 32, 33 impinging upon the light electric detectors are converted into corresponding electric pulses which are compared as to their relative phase shifts in the correlator 38 to form a differential signal which in turn effects corresponding mechanical displacements by actuating ..;, 10~ 0 1 the servo-motor 39. The latter operates the mechanical dis-placement means 42 to displace the image planes 32, 33 relative to each other until the correlator 38 signals are balanced.
The servo-motors 40 and 41, also via the mechanical displacement means 42, automatically displace the image planes 32, 33 about the transformed y-, x~axes of the terrain surface coordinate system.
The d~c. tachometer 43 connected to the servo-motor 40 supplies a directional d.c. voltage, proportional to the advance 1~ speed in y-direction, which is superimposed to the deflection voltage of the cathode ray tubes 28, 29 in the raster de-flection unit 44. Depending on the size of the d.c. voltage the rasters 45, 46 are subject to an additional displacement in the y-direction. In Fig. 4 the means for recording the recti-fication obtained are omitted for the sake of simplicity. The means can be, for example, a further image connected to one of the stereo photographs 32 or 33 which is rectified by suitable means to be imaged upon a cylindrical recording means. When in static operation the raster control via the d.c. tachometer 20 22 (Fig. 3) and 43 (Fig. 4j are in a non-operative mode.
In Fig. 5 a raster generating unit 47 supplies de-flection voltages Ux and Uy for the cathode ray tubes 48, 49.
A d.c. tachometer 51 connected to a servo-motor 50 feeds a d.c.
- voltage signal proportional to the motor operation speed and direction into a summation unit 53 via an amplifier 52. The summation unit 53 superimposes the voltage Uy to the d.c.
tachometer 51 voltage and varies the deflection voltage of the cathode ray tubes 48, 49 in the y-direction in accordance with the fed-in voltage.
Although the description of the invention has been given with respect to particular embodiments, it is not to be 10901'~0 1 construed in a limiting sense. Many variations and modifications will now occur to those skilled in the art. For a definition of the invention reference is made to the appended claims.
` 20 _ g _
The light electric detector is connected via the image correlator to the servo-motor which controls the height. The inventional device is used in differential rectification --operations.
Previous devices for differential rectification of aerial photographs including an automatic image correlator permit an automatic positioning of a measuring mark relative to a model surface when in static operation. -~
Static operation is to be understood throughout the - -specification as an adjustment operation with respect to the height of a measuring mark relative to a stereo-model, whereas in dynamic operation said mark is additionally dis-placed in a plane at right angles to the height coordinate.
In said devices the center of a light generated raster coincides with the measuring mark of a photogrammetric plotter.
When in dynamic operation the displacement of the measuring mark involves an offset in the image correlator.
Such an offset can be compensated for by additionally dis-placing the stored model profiles relative to each other in the event of an off-line operation between the differential 1~9~ 0 1 rectifier and the stereo plotter, that is, when the photographing of the model surface and the plotting operation are carried out separately and the model profiles obtained are temporarily stored.
This, however, requires a storage which implies considerably high costs with respect to equipment, apart from the longer time necessary for the evaluation operation.
In the event of an on-line dynamic operation between the differential rectifier and plotter the offset causes 0 distortions of neighbouring image details due to the lateral tilt. To cope with this disadvantage the scanning speed of the measuring mark has to be considerably reduced.
It is an object of the present invention to obviate the above disadvantages.
It is a further object of the present invention to provide a differential rectifier in combination with an automatic image correlator of high scanning speed concerning the com-pensation of distortions occuring when dynamically operated.
~ It is still a further object of the present invention to include a scanning control in a differential rectifier for scanning adjacent profiles in stereo photographs. These and other objects of the invention are realised in connecting an advance control servo-motor via a d.c. tachometer and via a ~ scanning generator and a deflection unit to a light source.
It is still a further object of the present invention to provide a device for scanning adjacent profiles in stereo-couples of photographs comprising at least one light source, being provided with a screen, a raster generating and controlling means for producing and controlling a flying spot raster on ~ said screen, the controlling means being connected to the light ,....
1()9t~1~0 1 source, at least one light beam being emitted from the raster, in each of the light beams being arranged, there being at least one optical imaging means, a photograph, and at least one light electric detector, the optical imaging system being for imaging the flying spot upon the photograph, and the light electric detector being for scanning the photograph and for converting the light signals into electric scanning signals, -a correlator for comparing the scanning signals produced by the light-electric detectors, a first and a second servo-motor, the first servo-motor being electrically connected to the correlator and to the light electric detector and being for adjustment of the height of the raster, the second servo-motor being for displacing the raster in a first direction at right - -angles to the height adjustment direction, a d.c. tachometer for generating a directional d.c. voltage, the d.c. tachometer being electrically connected to the second servo-motor and to the raster generating means for effecting a displacement of the raster in a second direction in additional to the first direction, a third servo-motor being for displacing the raster at right angles to the height adiustment and to the first direction, the first, second and third servo-motors being for performing relative displacements between each path of rays and the respective photograph allocated thereto.
In this manner displacements of adjacent scanned profiles in differential rectification are eliminated. In order that the invention may be more readily understood reference is made to the accompanying drawings which illustrate diagrammatically and by way of example three embodiments - thereof and in which:-Fig. 1 is a schematic view of a previous art device to illustrate the mode of operation, ll)901~0 1 Fig. 2 is a schematic view of the operation of the inventional device, Fig. 3 is a schematic view of a further embodiment according to the invention, Fig. 4 is still another schematic view of an embodiment of the invention, and Fig. 5 is a block scheme of a scanning control of the present invention.
In Fig. 1 a cathode ray tube 1 is displaceably arranged about the x-, y-, z-axis of a coordinate system 3 set up on a profile of a stereo-model 2 above which a projector 4 having an image plane 5 is located. The x-axis is at right angles to the drawing plane and therefore not represented. A not shown electronic unit generates a flying spot raster 6, having a center 7 on the screen of the cathode ray tube 1, The cathode ray tube 1 is displaceable in the y-direction to scan the stereo-model 2 by means of the raster 6.
In the course of this scanning operation, an automatic height adjustment of the cathode ray tube 1, and hence of the raster 6 relative to the stereo-model, is carried out in the z-direction.
Due to the lagging error involved in the height adjustment of the cathode ray tube 1, a height difference az occurs between the raster center 7 and a measuring mark 8 of an optical evaluation device (not shown for reasons of greater simplicity), which both, center 7 and mark 8r lie one above the other upon a straight line identical with the z-axis.
Therefrom a displacement ay of neighbouring model stripes results when they are projected into the image plane 5. This evident when considering the points of impingement of the projection beams 55 and 56 in the image plane 5. In contrast to 1091~1~0 1 Fig. 1, Fig. 2 displaces the raster center 7 in the y-direction so that the raster center 7 does not any longer coincide with a measuring mark 8 but advances the latter in the scanning direction. In this manner displacement errors ~y are eliminated at the presence of displacement errors ~z.
In Fig. 3 a cathode ray tube 9 being provided with a screen 9' is displaceable about an x-, y-shaft 10, 11 which corresponds to the z-, y-axis of the coordinate system 3 of Fig. 1. For the sake of greater simplicity, the servo-motor and shaft for displacement of the cathode ray tube 9 in the x-direction are omitted.
t~ ~
B The raster 12 generated oni~ screen 9' of the cathode ray tube 9 emits corresponding rays, in one portion of which a projector 13 with an image 14 is arranged followed by a light-electric detector 15, and in the other portion of the rays a projector 16, with an image 17 followed by a light electric detector 18 is located.
The individual images 14 and 17, respectively, are -formed in the image planes of the projectors 13, 16, respectively.
The two light-electric detectors 15, 18 are connected via mechanical control means 57, 58-to the cathode-ray tube 9 and electricaL~ to an electronic correlator 19 which controls via a servo-motor 20 the shaft 10. A servo-motor 21 is connected via a d.c. tachometer 22 and an amplifier 23 to the cathode ray tube 9. A vidicon 24 is electrically connected to the electronic correlator 19. In the path of rays of the former an optical imaging system 25, a slit aperture 26 and a film reel 27 are arranged.
- The two images 14, 17 with the projectors 13, 16 are oriented relative to each other to form a stereo-couple. The light pulses emitted from the cathode ray tube 9 raster 12 and, 10~01'~0 ¦~ 1 directed via the projectors 13, 16 and the image planeq ~, 17 to impinge upon light electric detectors 15 and 18 are con-verted by the latter into corresponding electric pulses. These are compared as to their phase position in the electronic correlator 19, where a differential signal is formed, if any, which in turn is fed into the servo-motor 20 to effect by operation of the latter via the shaft 10 a displacement of the cathode ray tube 9 along the z-direction, until the two phases are balanced. The scanned terrain surface section, that is, the image section, is reproduced on the vidicon 24 connected to the - electronic correlator 19. The reproduced image section is projected via the optical imaging system 25 and through the slit aperture 26 on to the film reel 27 or any other suitable recording means.
A servo-motor 21 automatically displaces the cathode -ray tube 9 along the spindle 11 in the y-direction which corresponds to an automatic scanning of the image planes 14, 17. The film reel 27 is synchronously rotated. The d.c.
tachometer 22, connected to the servo-motor 21, supplies a directional d.c. voltage proportional to the scanning speed in the y-direction via the amplifier 23. The voltage is applied to the cathode ray tube 9 where the former is superimposed to the deflection voltage which is necessary to generate the!raster.
This d.c. voltage serves to advance the raster in the y-direction, as explained in connection with Fig. 2.
In Fig. 4, the cathode ray tubes 28, 29 are non-displaceable light sources, each of which produces a light path (not shown) so that in the resulting two light paths the following components are arranged; first optical imaging systems 30 and 31 respectively, stereo-couple of photographs 32, 33 in 10901~() 1 the corresponding image planes and second optical imaging systems 34, 35.
The projectors 32 and 33 are displaceable about a coordinate system x', y' and x", y" respectively. The light beams emitted from the cathode ray tube 28, 29 are detected by the respectively coordinated light electric detectors 36, 37 which in turn are connected to an electronic correlator 38 to control a servo-motor 39.
The displacements of the stereo-couple of photographs 32, 33 are accomplished in cooperation with mechanical dis-placement means 42 by operation of servo-motors 40, 41 and as mentioned hereinabove by servo-motor 39. An electric connection is established between the servo-motor 40 and the cathode ray tubes 28, 29 via a d.c. tachometer 43 and a raster generating and deflection unit 44.
The path of light beams originating from the cathode ray tubes 28, 29 and arriving at the photodetectors 36, 37 are indicated by the axes 59 and 60 respectively. The rasters 45, 46 produced by operation of the raster generating unit 4 upon the respective cathode ray tube 28, 29 screens are imaged through the imaging systems 30, 31 into the projector image planes 32, 33 to scan the latter, and from whence to the respective light electric detectors 36, 37 via the second optical imaging systems 34, 35.
The light pulses which have been modulated by the stereo-couple of photographs 32, 33 impinging upon the light electric detectors are converted into corresponding electric pulses which are compared as to their relative phase shifts in the correlator 38 to form a differential signal which in turn effects corresponding mechanical displacements by actuating ..;, 10~ 0 1 the servo-motor 39. The latter operates the mechanical dis-placement means 42 to displace the image planes 32, 33 relative to each other until the correlator 38 signals are balanced.
The servo-motors 40 and 41, also via the mechanical displacement means 42, automatically displace the image planes 32, 33 about the transformed y-, x~axes of the terrain surface coordinate system.
The d~c. tachometer 43 connected to the servo-motor 40 supplies a directional d.c. voltage, proportional to the advance 1~ speed in y-direction, which is superimposed to the deflection voltage of the cathode ray tubes 28, 29 in the raster de-flection unit 44. Depending on the size of the d.c. voltage the rasters 45, 46 are subject to an additional displacement in the y-direction. In Fig. 4 the means for recording the recti-fication obtained are omitted for the sake of simplicity. The means can be, for example, a further image connected to one of the stereo photographs 32 or 33 which is rectified by suitable means to be imaged upon a cylindrical recording means. When in static operation the raster control via the d.c. tachometer 20 22 (Fig. 3) and 43 (Fig. 4j are in a non-operative mode.
In Fig. 5 a raster generating unit 47 supplies de-flection voltages Ux and Uy for the cathode ray tubes 48, 49.
A d.c. tachometer 51 connected to a servo-motor 50 feeds a d.c.
- voltage signal proportional to the motor operation speed and direction into a summation unit 53 via an amplifier 52. The summation unit 53 superimposes the voltage Uy to the d.c.
tachometer 51 voltage and varies the deflection voltage of the cathode ray tubes 48, 49 in the y-direction in accordance with the fed-in voltage.
Although the description of the invention has been given with respect to particular embodiments, it is not to be 10901'~0 1 construed in a limiting sense. Many variations and modifications will now occur to those skilled in the art. For a definition of the invention reference is made to the appended claims.
` 20 _ g _
Claims
1. A device for scanning adjacent profiles in stereo-couples of photographs comprising at least one light source, being provided with a screen, a raster generating and controlling means for producing and controlling a flying spot raster on said screen, the controlling means being connected to the light source, at least one light beam being emitted from the raster, in each of the light beams being arranged, there being at least one optical imaging means, a photograph, and at least one light electric detector, the optical imaging system being for imaging the flying spot upon the photograph, and the light electric detector being for scanning the photograph and for converting the light signals into electric scanning signals, a correlator for comparing the scanning signals produced by the light-electric detectors, a first and a second servo-motor, the first servo-motor being electrically connected to the correlator and to the light electric detector and being for adjustment of the height of the raster, the second servo-motor being for displacing the raster in a first direction at right angles to the height adjustment direction, a d.c. tachometer for generating a directional d.c.
voltage, the d.c. tachometer being electrically connected to the second servo-motor and to the raster generating means for effecting a displacement of the raster in a second direction in additional to the first direction,
Claim 1 continued:
a third servo-motor being for displacing the raster at right angles to the height adjustment and to the first direction, the first, second and third servo-motors being for performing relative displacements between each path of rays and the respective photograph allocated thereto.
a third servo-motor being for displacing the raster at right angles to the height adjustment and to the first direction, the first, second and third servo-motors being for performing relative displacements between each path of rays and the respective photograph allocated thereto.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD19347276A DD126404B1 (en) | 1976-06-21 | 1976-06-21 | Differential equalization device with automatic image correlator |
| DDWPG01C/193472 | 1976-06-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1090120A true CA1090120A (en) | 1980-11-25 |
Family
ID=5504897
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA281,058A Expired CA1090120A (en) | 1976-06-21 | 1977-06-21 | Device for scanning adjacent profiles in stereo photographs |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA1090120A (en) |
| DD (1) | DD126404B1 (en) |
| DE (1) | DE2722505A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102354220A (en) * | 2011-07-18 | 2012-02-15 | 李劲松 | Multi-axis motion control system for image measurement |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3548210A (en) * | 1965-08-30 | 1970-12-15 | Bendix Corp | Automatic stereoplotter |
-
1976
- 1976-06-21 DD DD19347276A patent/DD126404B1/en unknown
-
1977
- 1977-05-18 DE DE19772722505 patent/DE2722505A1/en not_active Ceased
- 1977-06-21 CA CA281,058A patent/CA1090120A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DD126404B1 (en) | 1982-12-29 |
| DD126404A1 (en) | 1977-07-13 |
| DE2722505A1 (en) | 1977-12-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5081353A (en) | Combined scanning electron and scanning tunnelling microscope apparatus and method | |
| US4423959A (en) | Positioning apparatus | |
| US3742495A (en) | Drone guidance system and method | |
| US3783294A (en) | Automated stereo-photogrammetric instrument | |
| GB1598735A (en) | Corpuscular beam apparatus | |
| US4390788A (en) | Electron beam patterning method and apparatus with correction of deflection distortion | |
| JPS60501277A (en) | cathode ray tube display device | |
| US2964644A (en) | Method and apparatus for locating corresponding areas of two similar images | |
| US3627918A (en) | Multiple image registration system | |
| US4017891A (en) | Method and equipment for line-by-line recording of color component images on a reproduction carrier | |
| US4221965A (en) | Scanning type electron microscope | |
| US3371161A (en) | Method of electronic stabilization of the image obtained with a television camera rigidly installed on a moving support | |
| US3678190A (en) | Automatic photo comparision system | |
| US2581589A (en) | Position indicating system | |
| EP0817155A3 (en) | Target projector automated alignment system | |
| CA1090120A (en) | Device for scanning adjacent profiles in stereo photographs | |
| US5500886A (en) | X-ray position measuring and calibration device | |
| US3595995A (en) | Automatic stereo instrument for registration of similar stereo photographs | |
| US5051599A (en) | Device for recognizing the impact site of a charge carrier beam on a target | |
| JP2883236B2 (en) | Three-dimensional shape measurement device for structures around railway tracks | |
| US4349732A (en) | Laser spatial stabilization transmission system | |
| US3554645A (en) | Automatic mapping system having a mechanically and electronically controlled scanning means for providing faster response | |
| EP0307906A1 (en) | Compensating eddy current effects in charged particle beam systems | |
| US3636254A (en) | Dual-image registration system | |
| US3674369A (en) | Automatic orthophoto printer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |