CN113411494A - Method for increasing monitoring visual angle and definition - Google Patents
Method for increasing monitoring visual angle and definition Download PDFInfo
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- CN113411494A CN113411494A CN202110580750.0A CN202110580750A CN113411494A CN 113411494 A CN113411494 A CN 113411494A CN 202110580750 A CN202110580750 A CN 202110580750A CN 113411494 A CN113411494 A CN 113411494A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000012544 monitoring process Methods 0.000 title claims abstract description 18
- 230000000007 visual effect Effects 0.000 title abstract description 14
- 238000000605 extraction Methods 0.000 claims description 6
- 230000004927 fusion Effects 0.000 claims description 6
- 239000011159 matrix material Substances 0.000 claims description 6
- 230000007547 defect Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/66—Remote control of cameras or camera parts, e.g. by remote control devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/698—Control of cameras or camera modules for achieving an enlarged field of view, e.g. panoramic image capture
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/95—Computational photography systems, e.g. light-field imaging systems
- H04N23/951—Computational photography systems, e.g. light-field imaging systems by using two or more images to influence resolution, frame rate or aspect ratio
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/2624—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects for obtaining an image which is composed of whole input images, e.g. splitscreen
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/2628—Alteration of picture size, shape, position or orientation, e.g. zooming, rotation, rolling, perspective, translation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
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Abstract
The invention provides a method for increasing monitoring visual angle and definition, which comprises the following steps: the first step is as follows: arranging a plurality of far-focus lens video acquisition devices, wherein each far-focus lens video acquisition device acquires images of a phase taking range at a preset shooting distance, and the images of adjacent far-focus lens video acquisition devices are overlapped at the edge part; the second step is as follows: a set of edge-overlapped images acquired with the plurality of afocal lens video capture devices; the third step: and carrying out a splicing algorithm on the group of images with overlapped edges to obtain a picture with an increased field angle.
Description
Technical Field
The invention relates to the field of electronics, in particular to a method for increasing a monitoring visual angle and definition.
Background
The existing video monitoring camera is limited by the imaging principle of the lens, and cannot obtain good effect on both clear view and wide view, because the closer the lens is, the wider the visual range is, the farther the lens is, the narrower the visual range is. Under the condition of a single-lens camera, the aim of wide visual range and far vision cannot be achieved. In practical application, images with large visual angles need to be acquired in certain scenes, and details at far distances can be seen clearly, and the requirements are generally realized by combining a zoom camera and a wide-angle fixed-focus camera, but the mode has two defects, one is that high-definition images can only be limited in the shooting range of the zoom camera, and the details of the images cannot be seen in other ranges shot by the wide-angle camera; secondly, if a plurality of zoom cameras and a wide-angle fixed-focus camera are combined, the mechanism for realizing multi-device linkage is very complex, so that the problems of high economic cost, poor operation experience and the like are caused.
The camera has been improved to provide a panoramic camera, which can monitor and cover the scene without blind spots, and is provided with a fisheye lens, or a reflecting mirror (such as a parabola, a hyperbolic mirror, etc.), or a plurality of common lenses facing different directions, and has a 360-degree panoramic view field. One panoramic camera can replace a plurality of common monitoring cameras, and seamless monitoring is achieved. A plurality of sensors in different orientations are packaged in a plurality of common lens products in different orientations, and the panoramic effect is obtained by performing image splicing operation on split pictures. The mainstream product is structured by packaging a plurality of sensors with two million images and a short-focus lens with independent field angle in a uniform shell. The core technologies of digital processing, compression and the like are integrated on the front-end firmware, a plurality of independent pictures are integrated into a high-definition panoramic picture of 180 degrees or 360 degrees according to the requirements of users, and then the high-definition panoramic picture is transmitted to a back-end management platform through a network or a high-speed bus.
However, such products are characterized in that a single sensor combination based on 200 ten thousand pixels is adopted, the integral definition is not high, a wide-angle lens is mostly adopted as the lens, the clear shot scene is generally within the range of 20-30 meters, a specially designed software tool is required for checking and using shot image data, and a general video management system is relatively complex to utilize such an image source.
That is, if a general single-lens camera is used, there is no way to achieve the purpose of a wide visual range while looking far away. However, if a panoramic camera is used, the overall sharpness of the obtained image is not high, the wide-angle lens is mostly used as the lens, the scene which can be clearly shot is generally within the range of 20-30 meters, the clear image of the remote object can not be obtained in the real sense, a specially designed software tool is needed for checking and using the shot image data, and the image source which is used by a general video management system is complex.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for increasing the monitoring viewing angle and the definition, aiming at the above-mentioned defects in the prior art.
According to the present invention, there is provided a method of increasing a monitoring viewing angle and clarity, comprising:
the first step is as follows: arranging a plurality of far-focus lens video acquisition devices, wherein each far-focus lens video acquisition device acquires images of a phase taking range at a preset shooting distance, and the images of adjacent far-focus lens video acquisition devices are overlapped at the edge part;
the second step is as follows: a set of edge-overlapped images acquired with the plurality of afocal lens video capture devices;
the third step: and carrying out a splicing algorithm on the group of images with overlapped edges to obtain a picture with an increased field angle.
Preferably, the plurality of afocal lens video capture devices are arranged on an arc, wherein an angle formed between shooting directions of adjacent afocal lens video capture devices is a horizontal field angle.
Preferably, the third step comprises:
performing feature extraction operation on the group of images with overlapped edges, and detecting feature points in each image;
carrying out image registration on the feature points in each image obtained by the feature extraction operation to establish a geometric corresponding relation between the images;
calculating a homography matrix by utilizing the established geometric corresponding relation between the images, and deleting the contents which do not belong to the overlapping area;
image deformation and fusion are performed using the homography matrix, and the set of edge-overlapped images are transformed and fused into a consistent output image.
Preferably, the plurality of afocal lens video capture devices are configured to capture images of a range of distances outside of a predetermined distance.
Preferably, the method of increasing the monitoring viewing angle and the clarity further comprises: a video capture device utilizing a wide-angle lens captures a scene over a range of distances within a predetermined distance.
Preferably, the predetermined distance is 50 meters away.
Compared with the mode of combining an independent wide-angle camera and one or more zoom cameras, the method has the advantages that the product is convenient to install and use, the use difficulty is greatly reduced, the utilization rate of the video acquisition image is increased, and compared with the mode of a panoramic camera, the real long-distance high-definition camera shooting can be realized.
Drawings
A more complete understanding of the present invention, and the attendant advantages and features thereof, will be more readily understood by reference to the following detailed description when considered in conjunction with the accompanying drawings wherein:
fig. 1 schematically illustrates a schematic diagram of a method for increasing the viewing angle and clarity of monitoring according to a preferred embodiment of the present invention.
Fig. 2 schematically shows a flow chart of a method of increasing the monitoring perspective and clarity according to a preferred embodiment of the invention.
It is to be noted, however, that the appended drawings illustrate rather than limit the invention. It is noted that the drawings representing structures may not be drawn to scale. Also, in the drawings, the same or similar elements are denoted by the same or similar reference numerals.
Detailed Description
In order that the present disclosure may be more clearly and readily understood, reference will now be made in detail to the present disclosure as illustrated in the accompanying drawings.
In the practical requirements of video image acquisition and application, a scene needs to simultaneously observe and record the position relationship and environmental characteristics of all objects in a large range through a single image acquisition device (for example, a person stands on the left side of an east stair channel of a square, and stops a black car at the side of the east stair channel), and can quickly observe details in a certain range (for example, the facial features of the person and the license plate number of a vehicle at the side of the person) in a long distance (more than 100 meters) at any time.
To solve such a need, the present invention creates a method of capturing a clear image at a long distance (for example, 50 meters or more) by a video capture device or apparatus equipped with a telephoto lens, capturing a scene at a short distance by a video capture device with a wide-angle lens, then a plurality of video acquisition devices or devices are assembled together to obtain a group of images which can be partially overlapped, the group of images are spliced into a single image by utilizing an image fusion algorithm to obtain a video or picture with a larger overall visual angle, a distant scene and clear details, the method can overcome the defect that the common video acquisition equipment or device cannot simultaneously take into account the two key indexes of large visual angle and clear detail, for a user, details of a distant object can be quickly and accurately viewed in one-click mode, and simultaneously, the details of the object in a large scene image and all shooting ranges are completely stored.
Compared with the mode of combining an independent wide-angle camera and one or more zoom cameras, the method has the advantages that the product is convenient to install and use, the use difficulty is greatly reduced, the utilization rate of the video acquisition image is increased, and compared with the mode of a panoramic camera, the real long-distance high-definition camera shooting can be realized.
Fig. 1 schematically illustrates a schematic diagram of a method for increasing the viewing angle and clarity of monitoring according to a preferred embodiment of the present invention. In fig. 1, a combination of image capturing apparatuses is shown, wherein reference sign C indicates a video capturing apparatus of a telephoto lens, and a plurality of video capturing apparatuses C are assembled in combination according to a certain rule, which is shown in the figure as one of horizontal combination manners, and an angle between each video capturing apparatus C is a horizontal field angle R of the telephoto lens, so that after the combination, each video capturing apparatus C forms a phase taking range D at a distance point with a distance of, for example, 50 meters, and the phase taking ranges between two adjacent phase taking ranges D form a certain degree of overlap. It can be seen from this illustration that the video capture device C can be assembled in multiple combinations, as long as images obtained on the same remote side can be formed with some degree of overlap at the edge portions.
Fig. 2 schematically shows a flow chart of a method of increasing the monitoring perspective and clarity according to a preferred embodiment of the invention. According to the invention, through the combination of image acquisition equipment and the processing of an image algorithm, the acquired images are spliced and fused, so that a single-point monitoring is realized, and meanwhile, the images with wide visual angles, high-resolution images and low-resolution images are obtained, and the requirements of users on video monitoring images are further met.
Specifically, as shown in the drawings, the method for increasing the monitoring viewing angle and the clarity according to the preferred embodiment of the present invention includes:
first step S1: arranging a plurality of far-focus lens video acquisition devices C, wherein each far-focus lens video acquisition device C acquires images of a phase taking range at a preset shooting distance, and the images of adjacent far-focus lens video acquisition devices C are overlapped at the edge part;
preferably, as shown in fig. 1, for example, a plurality of the telephoto-lens video capture devices C are arranged on an arc line, wherein an angle formed between the photographing directions of the adjacent telephoto-lens video capture devices C is a horizontal field angle R.
Second step S2: a set of edge-overlapped images acquired by the plurality of afocal lens video capture devices C;
third step S3: and carrying out a splicing algorithm on the group of images with overlapped edges to obtain a picture with an increased field angle. After that, a complete image spliced by algorithm fusion can be transmitted to an image display device for preview or storage through a wired or wireless network, a USB or an optical fiber mode, and the image can be output to other image application systems.
In addition, for example, the wide-angle lens video acquisition device can be reused to shoot a scene in a short distance range, and the scene and the far-focus lens device form a device group together, so that a wide-angle, far-distance and clear image is finally obtained.
In a specific example, the picture stitching in the third step S3 is a method for stitching a plurality of overlapped images of the same scene into a larger image, and the output of the picture stitching is a union of two or more input images, including the following steps:
performing feature extraction operation on the group of images with overlapped edges, and detecting feature points in each image;
the feature points in the individual images resulting from the feature extraction operation are registered to establish a geometric correspondence between the images for transformation, comparison and analysis in a common frame of reference. Image registration is the correlation of images with some sort or several kinds of algorithms.
Calculating homography matrix by establishing geometric correspondence between images (aiming at deleting unnecessary angles not belonging to overlapping regions);
image deformation and fusion are performed using the homography matrix, and the set of edge-overlapped images are transformed and fused into a consistent output image.
The invention obtains a clear image at a long distance (more than 50 meters) by shooting through a video acquisition device or device provided with a far-focus lens, then combines and assembles a group of partially overlapped images by a plurality of video acquisition devices or devices to obtain a group of images, splices the group of images into a single image by using an image fusion algorithm to obtain a video or picture with a large visual angle and clear details of a long-distance scene, then shoots a scene in a short-distance range by using a video acquisition device with a wide-angle lens, and forms an equipment group together with the devices with the far-focus lens to finally obtain an image with a wide visual angle, far and near clear.
It should be noted that the terms "first", "second", "third", and the like in the description are used for distinguishing various components, elements, steps, and the like in the description, and are not used for indicating a logical relationship or a sequential relationship between the various components, elements, steps, and the like, unless otherwise specified.
It is to be understood that while the present invention has been described in conjunction with the preferred embodiments thereof, it is not intended to limit the invention to those embodiments. It will be apparent to those skilled in the art from this disclosure that many changes and modifications can be made, or equivalents modified, in the embodiments of the invention without departing from the scope of the invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (7)
1. A method for increasing a monitoring viewing angle and sharpness, comprising:
the first step is as follows: arranging a plurality of far-focus lens video acquisition devices, wherein each far-focus lens video acquisition device acquires images of a phase taking range at a preset shooting distance, and the images of adjacent far-focus lens video acquisition devices are overlapped at the edge part;
the second step is as follows: a set of edge-overlapped images acquired with the plurality of afocal lens video capture devices;
the third step: and carrying out a splicing algorithm on the group of images with overlapped edges to obtain a picture with an increased field angle.
2. The method according to claim 1, wherein a plurality of the telephoto lens video capture devices are arranged on an arc line, wherein an angle formed between photographing directions of adjacent telephoto lens video capture devices is a horizontal field angle.
3. Method according to claim 1 or 2, characterized in that the third step comprises:
performing feature extraction operation on the group of images with overlapped edges, and detecting feature points in each image;
carrying out image registration on the feature points in each image obtained by the feature extraction operation to establish a geometric corresponding relation between the images;
calculating a homography matrix by utilizing the established geometric corresponding relation between the images, and deleting the contents which do not belong to the overlapping area;
image deformation and fusion are performed using the homography matrix, and the set of edge-overlapped images are transformed and fused into a consistent output image.
4. The method according to claim 1 or 2, wherein the plurality of afocal lens video capture devices are used to capture images that capture a range of distances outside a predetermined distance.
5. The method of claim 4, wherein the predetermined distance is 50 meters away.
6. The method according to claim 1 or 2, further comprising: a video capture device utilizing a wide-angle lens captures a scene over a range of distances within a predetermined distance.
7. The method of claim 6, wherein the predetermined distance is 50 meters away.
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| CN202110580750.0A CN113411494A (en) | 2021-05-26 | 2021-05-26 | Method for increasing monitoring visual angle and definition |
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| US20160212338A1 (en) * | 2015-01-15 | 2016-07-21 | Electronics And Telecommunications Research Institute | Apparatus and method for generating panoramic image based on image quality |
| US20160295108A1 (en) * | 2015-04-01 | 2016-10-06 | Cheng Cao | System and method for panoramic imaging |
| US20180060682A1 (en) * | 2016-08-24 | 2018-03-01 | Electronics And Telecommunications Research Institute | Parallax minimization stitching method and apparatus using control points in overlapping region |
| CN111899158A (en) * | 2020-07-29 | 2020-11-06 | 北京天睿空间科技股份有限公司 | Image splicing method considering geometric distortion |
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- 2021-05-26 CN CN202110580750.0A patent/CN113411494A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160212338A1 (en) * | 2015-01-15 | 2016-07-21 | Electronics And Telecommunications Research Institute | Apparatus and method for generating panoramic image based on image quality |
| US20160295108A1 (en) * | 2015-04-01 | 2016-10-06 | Cheng Cao | System and method for panoramic imaging |
| CN105744239A (en) * | 2016-05-11 | 2016-07-06 | 湖南源信光电科技有限公司 | Multi-focal-length lens ultrahigh resolution linkage imaging device |
| US20180060682A1 (en) * | 2016-08-24 | 2018-03-01 | Electronics And Telecommunications Research Institute | Parallax minimization stitching method and apparatus using control points in overlapping region |
| CN111899158A (en) * | 2020-07-29 | 2020-11-06 | 北京天睿空间科技股份有限公司 | Image splicing method considering geometric distortion |
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