RU2389154C1 - Device for panoramic television observation - Google Patents

Abstract

FIELD: physics.

SUBSTANCE: invention relates to panoramic television observation which is realised by a television system through a television camera with all-round view in a region closer to a hemisphere, i.e. in a spatial angle of 360 degrees on the azimuth and tens of degrees on the angle of elevation. In the plane of the output image of the panoramic catadioptic lens there is a fibre optic cap having n light guide branches (bundles). The television signal unit has n video signal sensors, the target of each of which is docked through a fibre optic joint with one of the n bundles, and the outputs are connected to corresponding inputs of the image reconstruction unit whose output is the output of the television camera. The number n of bundles and video signal respectively satisfy the relationship:

where γ_h is the horizontal angle of view of the image observed by the operator in degrees.

EFFECT: increased photoelectric conversion frame frequency due to paralleling of the photodetector target.

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Description

The present invention relates to panoramic television surveillance, which is performed by a television system using a television circular camera in an area close to the hemisphere, i.e. in a spatial angle of 360 degrees in azimuth and tens of degrees in elevation.

The closest in technical essence to the claimed invention should be considered a panoramic television surveillance device [1], containing a television camera connected in series and a server, which is a node of the local area network, while the television camera consists of sequentially located and optically connected panoramic mirror-lens and block digital television signal, the video signal sensor of which registers on the target all the ring optical image formed panoramic lens, and a server connected to two or more personal computers, each of which includes a system unit, the manipulator "mouse" and a video monitor.

The disadvantage of the prototype is the low frame rate of the photoelectric conversion due to physical and technological limitations of the maximum sampling rate of an image element in a megapixel video signal sensor, which causes distortion of dynamic scenes of a panoramic image.

The objective of the invention is to increase the frame rate of photoelectric conversion by parallelizing the target of the photodetector.

The problem is solved in that in the inventive device for panoramic television monitoring, containing a series-connected television camera and a server that is a node of a local area network, the television camera consists of sequentially located and optically connected panoramic mirror-lens lens and a digital television signal unit, and two or more personal computers are connected to the server, each of which contains a system unit, a mouse and video monito p, according to the invention, a fiber optic nozzle having n optical waveguides (bundles) is inserted into the output image plane of a panoramic mirror-lens lens, and the digital television signal unit contains n video signal sensors, each of which targets are connected via a fiber optic articulation with one of n nozzle harnesses, and the outputs are connected to the corresponding inputs of the image recovery unit, the output of which is the output of a television camera, and the number n ootvetstvenno tows nozzle and video sensors satisfies the relation:

,

,

where γ _g is the horizontal angle of the field of view in degrees observed by the operator of the image.

Comparative analysis with the prototype shows that the inventive device is characterized by the presence of new features, including:

- new elements in the television camera, which are: fiber optic nozzle, video signal sensors and image recovery unit;

- the relative position of the input window of the fiber optic nozzle relative to the image plane of the output image of the panoramic lens and the output bundles of the nozzle relative to the targets of the video signal sensors;

- new electrical connections between the video sensors and the image recovery unit;

- a parameter relating, respectively, the number of nozzle bundles and the number of video signal sensors with the horizontal field of view of the image observed by the operator.

The combination of known and new features of the claimed device is not known from the prior art, therefore, the proposed technical solution meets the criterion of novelty.

In the claimed solution, the light-to-signal conversion is performed not on one sensor target with a large number of useless (unused) pixels and a huge (megapixel) number of total number of photodetector elements, but in parallel on n sensor targets providing the desired image clarity for the operator. Due to this, the frame rate of the photoelectric conversion can be increased n times, and therefore, dynamic scenes of the panoramic image will be reproduced for the operator with less loss of fusion.

Therefore, according to the technical result and the method of its achievement, the proposed solution meets the criterion of the presence of an inventive step.

Figure 1 shows the structural diagram of the inventive device for panoramic television surveillance; figure 2 shows an example of the placement of areas of television recording (capture) in the plane of the output image of the panoramic lens; figure 3 schematically presents a panoramic image formed by a television camera, which in the form of a sequence of 6 frames is offered to the operator of a personal computer.

The inventive device for panoramic television surveillance, see figure 1, contains a television camera 1, which consists of sequentially located and optically connected panoramic lens 1-1, fiber optic nozzles 1-2 with n light guide branches (bundles), each of which is connected through a fiber-optic joint with a target of one of n video signal sensors (1-3), the outputs of which are connected to the corresponding inputs of the image recovery unit 1-4, the output of which is the output of a television camera and Inonii entry to server 2, which are connected to the outputs of two or more personal computers, each of which comprises a system unit 3, the manipulator "mouse" video monitor 4 and 5.

The panoramic mirror-lens 1-1 of the television camera is designed to form an optical image of a circular view (annular image). The technical solution of the panoramic mirror-lens lens has been patented in Russia by Russian specialists [2]. The angular field in the space of objects for this lens is 360 ° in azimuth and can reach (75 ÷ 80) ° in elevation, depending on the design.

Fiber optic nozzle 1-2 is designed to select n capture areas in the plane of the output annular image of the panoramic lens 1-1 and design these optical images on the target sensors 1-3.

Block 1-4 image recovery is intended for digital recording n frame sequence and transmitting it via a high-speed interface to server 2.

The purpose and technical solution of each of the sensors 1-3 video signal corresponds to similar blocks according to the publication [3].

The technical solution of fiber-optic nozzles 1-2 is borrowed from the publication [3], but is implemented with significant structural differences in terms of the choice of branches from the side of articulation with the lens. For comparison, figure 4 shows the placement of the television recording areas in the plane of the input window of the fiber optic nozzles 1-2 according to the solution [3], when the number of bundles n = 4.

The technical solution of the block 1-4 image recovery is also borrowed from the application [3], but with a partial use of its operational capabilities. In particular, the electronic combination of several images in one frame performed by this unit in the application [3] is not required in this decision. For illustration, figure 5 shows a frame sequence of four images combined in each frame, which is formed by the block 1-4 at the output with reference to the solution [3].

The purpose and technical solution of blocks 2, 3, 4 and 5 corresponds to computer devices of the same name.

Device panoramic television surveillance (see figure 1) works as follows.

Assume that the horizontal angle of the field of view (γ _g ) of the image observed from the screen of the video monitor 5 is sixty degrees. Then the number n = 6, and the annular image at the output of the panoramic lens 1-1 using the nozzle 1-2 must be divided into six areas of capture (see figure 2).

Optical images of these areas are projected, respectively, on the target of six sensors 1-3 video signal, which in parallel form six television signals for their registration. The dots in figure 2 mark the beginning of the first line of registration of the video sensor.

In block 1-4, digital recording of a panoramic image is carried out according to the criterion, when one "circular" frame corresponds to six "rectangular" frames in the sequence: "Region 1" - "Region 2" - "Region 3" - "Region 4" - "Region 5 "-" Region 6 "(see figure 3) while performing the correction of geometric distortions of each of the sections of the optical panoramic image.

From the output of the television camera 1, this digital signal via a high-speed interface, for example USB 2.0, is sent to server 2 and is provided to users of personal computers at the “network” output.

The local computer network connected to server 2 is formed by personal computers, each of which is equipped with a system unit in position 3, a mouse manipulator in position 4, and a video monitor in position 5. Each operator of a personal computer can select using the mouse manipulator 4 the proposed image and its output to the screen of the video monitor 5.

Assume that the horizontal field of view angle (γ _g ) of the image observed from the screen of the video monitor 5 is 22.5 °. Then the number n = 16, and the annular image at the output of the panoramic lens 1-1 using the nozzle 1-2 will need to be divided into sixteen capture areas. The operator will be offered a 16-frame sequence of panoramic images.

The technical result of the invention is that, in relation to the prototype, the frame rate of the light-signal conversion can be increased n times. An increase in the frame rate of photoelectric conversion means an increase in the unity of perception of the television image of a moving object when it is played on a standard computer video monitor.

Currently, all elements of the structural diagram of a panoramic television monitoring device are mastered or can be mastered by domestic industry. Therefore, the present invention should be considered as meeting the requirement for industrial applicability.

INFORMATION SOURCES

1. Smelkov V.M. On the question of constructing a television camera for panoramic observation / Special equipment and communications, No. 1, July-August 2008, pp. 12-17.

2. Kurtov A.V., Solomatin V.A. Panoramic mirror lens. Russian patent No. 2185645, G02B 13/06, G02B 17/08, filed December 22, 1999, published October 20, 2001.

3. A device for receiving television images using charge-coupled matrices and a transmission system with a similar device. Description to the application of France No. 2476949, H04N 5/32, АВВ 6/00, H04N 3/15, H05G 1/60, claimed on 02.22.1980, published on 08.28.1981.

Claims (1)

A panoramic television surveillance device comprising a television camera and a server in series that is a local area network node, the television camera consisting of sequentially located and optically coupled panoramic mirror-lens lenses and a digital television signal unit, and two or more personal computers are connected to the server , each of which contains a system unit, a mouse manipulator and a video monitor, characterized in that in the plane of the output image To provide a panoramic mirror-lens objective, a fiber-optic nozzle has been introduced, having n light-guide branches (bundles), and a digital television signal unit consists of n video signal sensors, each of which targets are connected via a fiber-optic joint with one of the n nozzle bundles, and the outputs connected to the corresponding inputs of the image recovery unit, the output of which is the output of the television camera, and the number n, respectively, of the nozzle harnesses and the video signal sensors satisfies th

where γ _g is the horizontal angle of the field of view of the image observed by the operator, deg.

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