SU800640A2 - Method and apparatus for choosing equal-height areas - Google Patents

Description

(54) METHOD FOR ISOLATION OF SITES OF EQUAL HEIGHT AND DEVICE FOR ITS IMPLEMENTATION

The purpose of the invention is to eliminate the influence of the slope of the imaged area in the direction of the shooting basis.

The goal is achieved by taking into account the different scales of the corresponding parts of the images by processing the superimposed holograms of the transformed images of the first snip of the stereo pair, the projection of the oriented first snapshot of the stereo pair and the plane of the correction plate is divided into narrow bands perpendicular to the direction of shooting.

The method is carried out with the help of a device in which a cylindrical raster optical system is inserted between the planes of the correction plate and the hologram carrier with a generator, perpendicular to the direction of the shooting basis, and an anamorphic lens.

The drawing shows a diagram of an apparatus for carrying out the proposed method.

In the path of coherent light beams in projectors 1 and 2, the first and second pictures of stereo pairs 3 and 4 are installed, respectively. The projectors are installed on the exterior orientation device terrain model 5. Each of the projectors and gkestko have filters 6 and 7 of high spatial frequencies placed in Fourier spectrum planes. In the space of the terrain model formed by the projectors, in space, which is taken to be horizontal in the geodetic coordinate system, there is a correction plate 8 (photographic plate.). In the plane, optically conjugated by means of a translucent beam splitter 9 with the plane of the correction plate 8, the visual control unit 10 is located. An electro-optical light modulator 11 is installed in front of the first projector to measure the polarization of the coherent light beam. The correction plate is located in the object plane of the cylindrical raster optical system 12 located along the beam, consisting, for example, of three cylindrical rasters 13-15 having the same pitch. The forming cylindrical rasters are perpendicular to the direction of the design basis, and the focal distances of the elements of these rasters are related

f -fs °° 14 Each of the three co-op elements of the rasters forms an optical system in which the raster element 13 forms a reverse image of a narrow strip of the projection of the first stereopair image. on the correction plate, this image being formed in the plane into which the raster element 14 is placed, performs the function of the collective objective. The raster element 15 forms a direct image of a narrow projection strip. The focal length of the raster element 14 is selected from the condition of maintaining a parallel path of rays behind a cylindrical raster optical system. The cylindrical rasters 13-15 can independently translate; they can be aligned along the optical axis. The imaging lens 16 transfers the image formed by the cylindrical raster optical system into the carrier plane of the hologram 17. In order to combine images into two mutually perpendicular pnc planes, the lens 16 is made anamofortable. In front of the carrier of the hologram at a certain angle to the optical axis there is a node changing the angle of incidence of the reference beam 18. A lens 19 is located behind the carrier of the hologram along the center direction of the reference beam when recording the holographic and the front focal plane coincides with the holographic l 17, and in its back the focal plane of the filter 20 low spatial frequency 20. The plane of the filter coincides with the front focal plane of the lens 21, the back focal plane of which coincides with The measuring plane of the pancritical lens 22, in the image plane of which the photodetector 23 is located, for example a photographic plate.

In the initial position before the beginning of orientation, there are no high frequency spatial filters b and 7 and a correction plate 8. For orientation, the plane of polarization of the beam of light going through the first projector is rotated by an electro-optical modulator 11 90 degrees relative to the plane of polarization of the beam of light going through second projector. The relative orientation of the images is performed using the visual inspection unit 10 in the usual manner by alternately turning the projectors. The exterior orientation and scaling of the model are performed on the reference points plotted on the Tablet in the visual control unit using the rotation and change in the size of the design base, carried out by means of the exterior orientation model of the terrain model 5.

Claims (1)

When recording holograms, the modulator 11 is turned off, restoring the initial polarization of the light in the first projector, and filtering the 6 high spatial frequencies into the plane of the Fourier spectrum of the first projector 1. During the exposure, the first picture of the stereo pair 3 installed in the projector 1 is illuminated with a coherent light beam diffracting in the picture, the constant component of the amplitude transmission is removed from it by the filter 6 of high spatial frequencies and by means of a cylindrical blocking optical fiber. transform with some scale the image of the projection of the first image of the stereo pair on the plane of the correction plate. The transformation is concluded in that the image of the projection is divided into narrow stripes, perpendicular to the direction of the shooting basis, and change for all images within the obtained bands a longitudinal scale relative to the original one, retaining the original values of the longitudinal coordinates of the centers of these bands. Then, during the exposure, an transformed image is formed in the plane of the hologram carrier 17 by means of an anamorphic imaging lens 16 and a picture of the interaction of the light beam with a parallel reference beam forming the transformed image is recorded on a hologram carrier. Then, other holograms of images transformed with scales overlapping the entire range of possible scale changes are recorded on the carrier 17. Prior to each subsequent exposure, displacing the transformed NIIA- by the cylindrical rasters 13-15 along the axis is changed, and the angle of the reference beam is changed by the node 18. After the exposure, the carrier is subjected to photographic processing. To record the correction plates, images are taken from the oriented projectors 1 and 2, the high spatial frequency filter 6 is removed, the correction plate 8 (photographic plate) is set, and during the exposure a picture of interference of coherent light beams transmitted along the optically axes of the oriented projectors is recorded on it. After exposure, the correction plate is subjected to photographic processing. When allocating areas equal to the cells, the second image from the reopar 4 is installed in the oriented projector 2, the filter 7 of high spatial frequencies is inserted into the plane of the Fourier spectrum of the second projector, and rasters 13-15 of the cylindrical raster optical system 12 are set in a position corresponding to their longitudinal the scale of this system. The second image of the stereo pair is illuminated by a beam of coherent light that diffracts in the image, the amplitude-transmission constant component is removed from the beam by filter 7 of high spatial frequencies This modulated beam is modulated with a correction plate 8. After the correction plate, this beam propagates in the direction of the beam from the first projector, and the cylindrical raster optical system 12 and the anamorphic lens 16 depicting are transferred without changing the image formed in the plane of the correction plate to the plane of the carrier 17 holograms that modulates this beam. The reference waves are restored from the sections with the desired height value, which are focused by the lens 19 into the plane of the low-pass filter 20, attenuating the noise. Lens 21, the focal length of which is equal to the focal length of lens 19, forms in its back focal plane on a 1: 1 scale image of those sections of the carrier of the hologram from which the reference waves were reconstructed. These will be the sections with the desired height 3Ha4eHtr that are selected by brightness and depicted in the central projection, as in aerial photographs. A pancreatic lens 22, which is used to transition from a central projection to a rectangular one, forms in the plane of the photodetector 23 images of selected areas at a certain defined scale. This image is used to create contour lines. To select areas with a different height value, the second projector is shifted along the projection basis to the corresponding position and, accordingly, changes the image scale in the plane of the photodetector. Thus, on the photodetector 23, after processing, an image of contour lines is obtained, which are used in the preparation of topographic maps. Claims 1. A method for isolating areas of equal height according to the author. No. 690290, characterized in that, in order to eliminate the influence of the slope of the imaged area in the direction of the shooting basis, taking into account the different scales of the respective image areas by processing the superimposed holograms of the transformed images of the first picture of the stereo pair, the projection of the oriented first picture of the stereo pair on the plane of the correction plate is divided into narrow strips, perpendicular to the direction of shooting 2. A device for carrying out the POP.1 method, which means that a cylindrical raster optical system with a generator perpendicular to the direction of the shooting basis and an anamorphic lens are inserted between the planes of the correction plate and the carrier of the hologram. Sources of information taken into account during the examination 1. USSR author's certificate in application No. 2497364 / 18-10, 13.06.77.