KR101398934B1 - Wide field of view infrared camera with multi-combined image including the function of non-uniformity correction - Google Patents

Abstract

A multi-section view image acquisition type infrared wide-angle camera with a function of non-uniformity correction according to the present invention includes: a scanning mirror (70) which acquires a field of view more than an angle of 95 degrees by forming an image of each frame with six scanning images (a-1, a-2, a-3, a-4, a-5, a-6) through rotation divided into six stages; a re-imaging optical system which allows the scanning mirror (70) and a cold stop (11) to make an image to enable the effective blocking of adjacent column spill light and the optimization of the size of the scanning mirror; a field stop (60) which is provided on an infrared path to enable the blocking of spill light and the adjustment of transmittance; and a black body corrector which allows the scanning mirror to face the reference plane of a black body (85) while the scanning mirror returns to a starting point after a front image is acquired by rotating the scanning mirror (70). Thus, a clear image to which non-uniformity correction on a detector is applied can be obtained without securing a separate optical path for non-uniformity correction or applying an optical/mechanical mechanism. In particular, an optical system with a long focal distance can be realized while providing a wide-angle field of view to eliminate the disadvantages of a fish-eye type wide-angle optical system, thereby easily detecting and identifying a target.

Description

[0001] The present invention relates to a method for securing a multi-segment clock image in which a non-uniformity correction function is provided,

The present invention relates to a surveillance infrared camera, and more particularly, to a non-uniformity correction function capable of obtaining a clear image by simultaneously performing non-uniformity correction using a blackbody reference plane while providing a wide angle horizontal clock of 95 구성 or more, The present invention relates to an infrared wide angle camera.

In general, infrared optical systems used for surveillance or detection purposes are required to provide wide clocks and to provide resolution for detection and identification of targets.

Therefore, the infrared optical system adopts a wide-angle optical system of the fish-eye type that provides a wider range of 60 ° or more, and employs a physical or algorithmic correction method to improve the detector nonuniformity correction Is performed.

As an example of such a physical or algorithmic correction method, a blurring correction method and a blackbody reference plane correction method are exemplified. The blurring correction method is a method in which a uniform amount of light is incident on a top surface of an optical system so that no specific image is formed on the top surface of the optical system. The black body reference surface correction method provides a black body surface, .

By applying these functions, the infrared optical system used for detection purposes performs the monitoring function and obtains clear images.

Korean Registered Patent No. 10-0969522 (July 05, 2010)

However, a fish-eye type optical system has a limitation in that the focal length of the optical system is shortened in order to provide a wide-angle clock, thereby degrading the resolution. As a result, the surveillance or detection area can be provided as a wide clock of 60 ° or more, but the detection and identification ability of the infrared camera for surveillance or detection can not be reduced.

In addition, a blurring correction method for non-uniformity correction of an infrared image requires a separate driving mechanism for providing a blurred image, and thus the size of the infrared camera can not help but increase. Another method, the blackbody reference plane correction method, requires a separate optical path for the infrared ray detector to look at the blackbody surface, so that the optical system configuration is complicated and it is necessary to secure a separate space for the blackbody and the optical path.

In view of the above, the present invention provides a wide-angle horizontal clock of 95 degrees or more in a six-section scan mode, thereby eliminating the disadvantages of the fish-eye type wide-angle optical system. In particular, The present invention provides an infrared wide angle camera capable of providing a non-uniformity correction function capable of obtaining a clear image by automatically correcting non-uniformity of a detector when a reference plane is installed.

According to an aspect of the present invention, there is provided a multi-segment clock image securing infrared ray wide angle camera including a scan mirror for acquiring every frame of a scan image of six sections for securing a forward image of 95 degrees or more; A re-imaging optical system for making a cold stop for blocking the scanning mirror and the peripheral thermal misalignment into a pair-phase image; A field stop provided on the infrared ray path so as to implement the light blocking and transmittance control; And a black body for providing a black body reference surface for viewing a non-uniformity of the image while returning after obtaining the forward image by rotating the scanning mirror.

Wherein the re-optical system functions as a cold stop image of the detector so as to correspond to the scanning mirror and is constituted as a module by an image-forming lens and a connecting lens, and the field stop is constituted by a transmission filter placed at a position to be imaged by the objective lens And the scanning mirror is constituted by an objective lens and the black body as a module.

Wherein the infrared detector is located in front of the imaging lens including a cold stop, the first mirror is located behind the imaging lens, the connection lens is located below the first mirror, Is positioned below the connection lens together with the field stop, the objective lens is located in front of the second mirror, and the scanning mirror is located in front of the objective lens.

Each of the scan images of the six sections is formed with an overlapped section for matching with the adjacent scan images of 5 degrees or more.

The blackbody is placed in a position where the scanning mirror can be seen during the return, and the correcting lens, which lies between the black body and the scanning mirror, allows the infrared detector to be viewed with the collimated beam when viewing the blackbody through the scanning mirror. And a collimating optical system. Further, the outer wall space between the scanning mirror and the black body is enclosed by an anti-reflection baffle and is installed to block external light.

In the present invention, the infrared wide-angle camera forms an image in a scan form of six sections to provide a wide-angle horizon of 95 ° or more while providing a sufficient long focal distance, thereby providing resolution for detection and identification of a target, fish-eye type wide-angle optical system is solved, the effect of realizing the monitoring or detecting function of the infrared wide angle camera can be sufficiently realized.

In addition, the present invention is advantageous in that a clear image to which detector nonuniformity correction is applied at the time of acquiring every frame image is obtained by automatically performing the blackbody reference plane correction method during scanning of an image.

Further, according to the present invention, when the scanning mirror returns to the origin after the image scanning, it is necessary to secure the optical path for the non-uniformity correction optical system by observing the blackbody reference plane for correcting the detector nonuniformity and to provide a light / mechanical mechanism There is an effect that the surveillance infrared camera system is configured more simply and compactly.

FIG. 1 is a block diagram of an infrared wide-angle camera in which a non-uniformity correction function according to the present invention is provided. FIG. 2 is a block diagram of a multi- FIG. 3 is an example of an image configuration using six sections of an infrared wide-angle camera and an image clock of 95 ° or more provided with a non-uniformity correction function according to the present invention, and FIG. A method for securing a multi-segment clock image in which a non-uniformity correction function according to the present invention is provided is a black body reference plane correction state using a scanning mirror of an infrared wide angle camera.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which illustrate exemplary embodiments of the present invention. The present invention is not limited to these embodiments.

1 shows a configuration of an infrared wide-angle camera in which a non-uniformity correction function according to the present embodiment is provided.

As shown in the figure, the infrared wide-angle camera includes an infrared ray detector 10, an image forming lens 20, a connecting lens 30, an objective lens 40, first and second mirrors 50-1 and 50-2, (70), and a blackbody corrector (80).

The infrared detector 10 further includes a cold stop 11 so that the cold stop 11 and the scan mirror 70 are configured in a re-image form in which the scan mirror 11 and the scan mirror 70 are mated to each other, thereby minimizing the size of the scan mirror.

The image forming lens 20 is positioned behind the infrared ray detector 10 and is connected to the connecting lens 30 through the first mirror 50-1 and then through the second mirror 50-2 to the objective lens 40. [ Lt; / RTI > At this time, a filter-type field stop 60 is provided on the infrared path of the connection lens 30 and the second mirror 50-2 so that the blocking of the light and the transmission rate can be easily controlled.

In the present embodiment, the image forming lens 20 is configured in units of modules together with the infrared ray detector 10, and the connection lens 30 is mounted on the module unit together with the first and second mirrors 50-1 and 50-2. And the objective lens 40 is configured on a module basis together with the scanning mirror 70 and the blackbody corrector 80. [

By using such a module unit configuration, it is possible to more easily implement the entire optical system, and to more effectively perform focus control according to the monitored target position and focus control according to the environmental change.

The scan mirror 70 is composed of six sections of clocks and provides an image of 95 ° or more. In this case, the scan image of six sections provides more than 5 degrees of overlapped section for matching with each adjacent scan image, so that it is possible to achieve a sufficient image matching in stabilization driven by the disturbance.

The black body corrector 80 places the black body surface at a position where the black body surface can be viewed while rotating the scan mirror 70 and returning to the origin after acquiring the forward image, Can be provided.

To this end, the black body corrector 80 is provided with a correction lens 81 for allowing all the pixels of the infrared detector to see the same black body surface through the scanning mirror 70, a baffle 83 for blocking off the peripheral mis- And a black body 85 which provides a black body 85.

FIG. 2 is a diagram illustrating a photograph of a forward image of 95.degree. Or more while the scanning mirror 70 rotates, and FIG. 3 shows an example of an image of six sections taken by the scanning mirror 70. FIG.

As shown, the scanning mirror 70 provides a wide-angle clock of 95 ° or more by photographing the front monitored region divided into regions of 95 ° or more. Therefore, the entire clock of the infrared wide angle camera is divided into the first scan image a-1, the second scan image a-2, the third scan image a-3, the fourth scan image a- (A-5), and a sixth scan image (a-6).

The scan images a-1, a-2, a-3, a-4, a-5 and a-6 of six sections can be matched with overlapping sections of 5 degrees or more, Thereby enabling a sufficient image registration.

Meanwhile, FIG. 4 shows the flow of light during correction of a blackbody reference plane using a scanning mirror of a multi-zone clock image acquisition type infrared wide angle camera provided with a nonuniformity correction function according to the present embodiment.

As shown in the figure, the scan mirror 70 acquires six scan images (a-1, a-2, a-3, a-4, a- So that the blackbody 85 surface providing a uniform temperature is used as a reference surface for non-uniformity correction of the infrared detector.

Such a combination of the scanning mirror 70 and the blackbody corrector 80 can provide a clear image with improved infrared image irregularity without any additional space or mechanism.

A-2, a-3, a-4, a-4, and so on are provided in the infrared wide-angle camera in the multi-segment clock image securing method provided with the non-uniformity correction function according to the present embodiment, 5, a-6) every frame, a re-imaging optical system that provides an optimal blockage of ambient light and optimization of the scan mirror size by mating with the scan mirror 70, A field stop 60 provided on the infrared path so that the transmittance control is realized, a scan mirror 70 which rotates and provides a uniform temperature surface so that the scan mirror 70 can look after the section in which the image of the front is acquired The black body 85 is included to facilitate the detection and identification of the target with a sufficient long focal length distance which eliminates the disadvantages of the fish-eye type wide-angle optical system. In particular, Without applying mechanical mechanisms, It is possible to obtain a clear image based nonuniformity correction applied.

10: infrared detector 11: cold stop
20: image forming lens 30: connecting lens
40: objective lenses 50-1, 50-2: first and second mirrors
60: Field stop 70: Injection mirror
80: Blackbody compensator
81: Correcting lens 83: Baffle
85: Black body

Claims (5)

A scanning mirror for acquiring a clock of 95 ° or more by constituting six frames of the image of each frame through six divided rotations;
A re-imaging optical system that enables the scan mirror and the cold stop to be in phase-by-phase to effectively block the thermal misfit around the scan mirror and optimize the scan mirror size;
A field stop provided on the infrared ray path so as to implement the light blocking and transmittance control;
And a black body corrector for viewing the reference surface of the black body while returning to the origin after obtaining the forward image after the scanning mirror rotates,
The black body is placed at a position where the scanning mirror can be viewed while returning, and is provided with a correction lens arranged in an anti-reflection baffle along the outer wall between the black body and the scanning mirror and providing a collimated light beam in the space therebetween Multi-segment clock image acquisition method with non-uniformity correction function. Infrared wide angle camera.
[Claim 2] The method according to claim 1, wherein the cold stop is constituted as a module by an infrared ray detector and an image forming lens, the field stop is composed of a module by a first mirror, a connecting lens and a second mirror, Wherein the non-uniformity correction function is provided by a black body.

[3] The apparatus according to claim 2, wherein the infrared detector includes a cold stop and is positioned in front of the imaging lens, the first mirror is positioned behind the imaging lens, and the connection lens is positioned below the first mirror , The second mirror is located below the coupling lens together with the field stop, the objective lens is located in front of the second mirror, and the scanning mirror is located in front of the objective lens Multi-segment clock image acquisition method with non-uniformity correction function Infrared wide angle camera.
The infrared wide-angle camera according to claim 1, wherein the overlapping section for matching the six scan images with the adjacent scan images is formed at 5 degrees or more.
delete

Images