SU1278581A1 - Device for automatic identifying identical points on double images - Google Patents

Abstract

The invention relates to photogram metrics and allows for an increase in the accuracy of automatically identifying identical points of photographs by reducing the effect of a nonlinear change in the speed of movement of the 5th scanning beam. The beam generated by the scanner 1 is divided by a translucent mirror 2 into two luminous fluxes, one of which is transmitted by two identical optical channels by a translucent mirror 3 of the beam-splitting unit. With lenses 7 and 7, the streams are focused in the image plane on carriages 8 and 8, on the image of which a scanning raster is formed. The second stream from mirror 2 is focused by the objective 13 of the additional electro-optical channel onto the plane of the optical grating 14, made in the form of a transparent plate with strokes applied at regular intervals modulating the light rays at time points corresponding to the conversion of the photo images scan signals. The output signals of the photoreceiver (L kov 10,10 and 16 arrive through the blocks 11 and and into the block 12, which compares the signals according to the specified algorithms. 1 or 00 SP SP

Description

The invention relates to photogrammetry, in particular, to devices for the automatic processing of stereo photographs.

The purpose of the invention is to improve the accuracy of automatically identifying identical points of photographs by reducing the effect of a non-linear change in the speed of movement of the scanning beam.

The drawing shows a diagram of the device.

The device contains a scanner 1, a beam-splitting unit consisting of translucent mirrors 2 and 3 and mirrors 4 and 6, two readings, their electro-optical channels and one reference channel. Each read channel includes a focusing lens 7 (7) located along the rays,

"ABOUT

meters rasters scan images of photographs. The light rays are modulated by the strokes of the optical lattice and are further collected by the lens 15 and fed to a photodetector 16, in which the light rays are converted into electrical signals. The output signals of the photodetector 16 through the amplifier 17, in which the signals corresponding to the strokes are extracted, are fed to the control inputs of the quantization blocks 11 and 11. Thus, the conversion of signals from scanning images of photographs occurs at times corresponding to the passage of the scanning beam Ф | through the strokes of the optical lattice.

  JJ - - - - J -. - j -, -,. - 11I

a carriage with photographs fixed on it - as well as the spatial position

20

25

com 8 (8), collecting lens 9 (9) and photodetector 10 (10). The outputs of the photodetectors 10 and 10 are connected to the inputs of the quantization units 11 and 11, the outputs of which are connected to the signal comparison unit 12.

The reference channel includes a focusing lens 13 arranged along the optical rays, an optical lattice 14, which is a transparent plate with strokes applied at regular intervals, collecting lens 15 and a photo detector 16, the output of which through amplifier 17 is connected to the control inputs of the blocks 11 and 11 quantization of signals.

The device works as follows.

Scanner I generates a scanning beam, ° which is divided with the help of semi-transparent mirrors 2 and 3 into three streams Ф |, and Фз. The light fluxes Ф2 and Фз (reading) with the help of mirrors 4-6 and lenses 7 and 7 are focused in the plane of the images fixed on the carriages 8 and 8, on the image of which they form a scanning raster. Rays of light modulated by optical densities of photographic cells are collected by lenses 9 and 9 and directed at a photodetection. Lines 10 and 10, in which light signals are converted into electrical ones. The output signals of the photoreceivers 10 and 10 enter the quantization blocks 11 and 11, and from there to the signal comparison block 12, which compares the signals according to specified algorithms.

Reference luminous flux f | focusing on the lens 13 on the plane of the optical lattice 14, on the image of which a scanning raster is formed, the parameters of which are rigidly connected to the para35

40

45

the stroke is rigidly connected with the coordinates of the scanning raster, then the reading of the image of the photograph occurs at the fixed points of the scanning raster whose coordinates are known with high accuracy.

Claims (1)

Invention Formula A device for automatic identification of identical points on images of a stereo pair, containing a scanner, a beam-splitting unit and two electro-optical channels, each of which sequentially accommodates a focusing lens, a carriage with a photograph, a collecting lens and a photodetector, the output of which is the output of the entire channel, quantization blocks signals with two inputs, the second of which is control, and a signal comparison unit, with the output of each of the electro-optical channels connected to the first input of the corresponding The quantization unit, the output of which is connected to the input of the signal comparison unit, is characterized in that, in order to improve the identification by reducing the influence of the nonlinear change in the speed of movement of the scanning beam, a semitransparent mirror located between the scanner and the beam-splitting node and the third are inserted into it. An electro-optical channel, in which an optical lattice is installed instead of a carriage with a photograph, is made in the form of a transparent plate coated on it through equal pro-interstitial strokes, moreover A photodetector through an amplifier is connected with control inputs of quantized signal blocks. Compiled by V. Podgornov Editor M. BlanarTehred I. VeresKorrektor .M. Demchik Order 6818/34 Draw 670 Subscription V11IIGI State Committee ((but in the cases of inventions and openings 1 13035, Moscow. G -35, Raun1ska nab., 4/5 Productively. 1I | -raficheskie non-indriny. Uzhgorod, st. Design. four meters rasters scan images of photographs. The light rays are modulated by the strokes of the optical lattice and are further collected by the lens 15 and fed to a photodetector 16, in which the light rays are converted into electrical signals. The output signals of the photodetector 16 through the amplifier 17, in which the signals corresponding to the strokes are extracted, are fed to the control inputs of the quantization blocks 11 and 11. Thus, the conversion of signals from scanning images of photographs occurs at times corresponding to the passage of the scanning beam Ф | through the strokes of the optical lattice. . - 11I as well as the spatial position 0 five ° five 0 five the stroke is rigidly connected with the coordinates of the scanning raster, then the reading of the image of the photograph occurs at the fixed points of the scanning raster whose coordinates are known with high accuracy. Invention Formula A device for automatic identification of identical points on images of a stereo pair, containing a scanner, a beam-splitting unit and two electro-optical channels, each of which sequentially accommodates a focusing lens, a carriage with a photograph, a collecting lens and a photodetector, the output of which is the output of the entire channel, quantization blocks signals with two inputs, the second of which is control, and a signal comparison unit, with the output of each of the electro-optical channels connected to the first input of the corresponding The quantization unit, the output of which is connected to the input of the signal comparison unit, is characterized in that, in order to improve the identification by reducing the influence of the nonlinear change in the speed of movement of the scanning beam, a semitransparent mirror located between the scanner and the beam-splitting node and the third are inserted into it. An electro-optical channel, in which an optical lattice is installed instead of a carriage with a photograph, is made in the form of a transparent plate coated on it through equal pro-interstitial strokes, moreover A photodetector through an amplifier is connected with control inputs of quantized signal blocks.