SU553444A1 - Device for automatic identification of identical points on color images of a stereo pair - Google Patents

Description

FIG. 1 shows a block diagram of the proposed device; in fig. 2- construction of the four-dimensional vector of the analyzing block from the input signals.

A device for automatic identification of identical points on color photographs of a stereo pair contains two identical transmitting photovoltaic assemblies, each of which contains transmitting cathode ray tubes 1 and 2, in front of which are installed projection optical systems 3 and 4 and carriages 5 and 6, which serve to reinforce color photographs stereo pair. Two versions of the device are possible. For processing images taken on a transparent basis and for processing images taken on an opaque basis. In the case of processing color images taken on an opaque basis, the device provides a rotating optical information reading system that operates in reflected light. FIG. 1, an embodiment of a device for processing images taken on a transparent basis is considered.

Behind the carriages 5 and 6 there are optical systems 7 and 8, consisting of a collimator and a focusing lens, which are optically connected (placed along the optical rays; with dispersion elements (naniviviep, prisms; Y and iU, which have the ability to decompose the rays falling on them F and F ia beams of primary colors F, F, F and F., F, F

corresponding photosensitive layers of photographic material, since colored photographic materials are a three-layer composition, each layer of which is sensitive only to a specific (primary) color, such as red, blue, or green.

Dispersion elements 9 and 10 are optically coupled through appropriate interference filters And, 11, And, and 12, 12, 12, which serve to increase the noise immunity of the device, with photomultipliers 13, 13, id and 14, 14, whose outputs are respectively connected to normalizing amplifiers 15, 15, and 16, 1Ь, 16, respectively, which exclude the influence of the nonlinearity of the spectral characteristics of the scanning cathode ray tubes and photomultipliers. For this, the gain of each normalizing amplifier X is determined from the relation:

Ap; -Q: COnst,

where P is the sensitivity of the cathode ray tube at long wavelengths A;

C - sensitivity of the photomultiplier for long waves K.

The outputs of the normalizing amplifiers 15, 15, and 16, 16, 16 are connected to the inputs of the analyzing device 17, the output of which is connected to the device for relative movement of the scanning raster and the carriages 18,

which, in turn, is associated with the carriages and control outputs of the scanning cathode ray tubes.

The device works as follows. 5 Light points from the screens of the cathode ray tubes are projected by optical systems onto the plane of the arrangement of color images fixed in the carriages. After passing (reflecting) the light beam through the stereopair snapshots, they fall on optical systems consisting of a collimator and a focusing lens, and then on dispersion elements, which decompose the rays of primary colors falling on them corresponding to the photosensitive layers of the photo material that pass through appropriate interference filters and fed to photomultipliers, where they are converted into electrical signals, which

0 through the normalizing amplifiers enter the analyzer.

The input signals of the analyzing device contain information about the color characteristic of a point in the form of three components of the primary colors and information about the optical density of this point, which is determined by the sum of the signals coming from the normalizing amplifiers, each of which is divided by the gain

0 normalizing amplifier. This information can be represented in the form of a four-dimensional vector defined in the coordinate space J- (, - / 2, h, where D is the optical density of the image point, and УЬ - / 2 з, are the primary colors of the photo5 material.

This vector can also be interpreted in three-dimensional space if we set it in an orthonormal color space, i, 2, h, and take the modulus of the vector to be equal to the optical density of the points (see Fig. 2). The analyzing device 17, on the basis of the received information, generates an identification signal, which is fed to the device relative movement of the scanning element and

5 of the color snapshot 18, which shifts the scanning element relative to the snapshot until reading is performed at identical points.

Claims (1)

Invention Formula A device for automatic identification of identical points on color photographs of a stereo pair, containing two identical transmitting photovoltaic nodes, each of which is made in the form of a cathode ray tube and image carriage, are made with the possibility of mutual movement, between an optical design system and a photoelectric receiving unit, analyzing a unit whose input is connected to the outputs of the photovoltaic receiver units, and the output is connected with the system of relative movement of the image carriages and electronically -beam tubes, different In order to improve the accuracy and reliability of the identification of points, in each of the transmitting photovoltaic nodes the photoelectric receiving unit is designed as a focusing optical system, an optical dispersion element connected to it and a three-channel photoelectric converter installed behind it, each of which contains a photomultiplier set before him the interference a filter and a normalizing amplifier whose input is connected to a photomultiplier, and an output to an analyzing unit, the gain of each of the normalizing amplifiers being determined from the ratio. A.p.qmconst, where K is the gain; P is the sensitivity of the cathode-ray tube at the wavelength / V. Blue 1 (Pi)