CN103442221A - Virtual PTZ system and method based on image zooming and cropping - Google Patents
Virtual PTZ system and method based on image zooming and cropping Download PDFInfo
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- CN103442221A CN103442221A CN2013103998439A CN201310399843A CN103442221A CN 103442221 A CN103442221 A CN 103442221A CN 2013103998439 A CN2013103998439 A CN 2013103998439A CN 201310399843 A CN201310399843 A CN 201310399843A CN 103442221 A CN103442221 A CN 103442221A
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Abstract
The invention discloses a virtual PTZ system and method based on image zooming and cropping. The system is composed of a control terminal and a video camera which are interconnected via a network. A user uses the control terminal to remotely control the video camera. The video camera is a high-resolution image acquisition, encoding and network transmission device with image processing capacity. The video camera uses an image processor to process original images acquired from an image sensor especially based on cropping and zooming processing so that the virtual PTZ system is realized. The control terminal receives operations from the user and transfers the operations of the user into PTZ control requests so that the range of images transmitted back from the video camera is remotely controlled. After the video camera receives the PTZ control requests, corresponding operations are performed according to PTZ control types. If one type is to move horizontally, an operation of moving horizontally is performed; and if one type is to zoom, the operation of zooming according to zooming scales is performed.
Description
Technical field:
The present invention relates to field of video monitoring, relate in particular to a kind of virtual PTZ system and method based on image scaling and reduction.
Background technology:
Along with the development of sensor technology, Image Compression, computer technology, mechanics of communication, video monitoring obtains application widely.Video monitoring system, through the development of two more than ten years, from the simulation monitoring to the digital supervision, develops into current IP (internet protocol) Network Video Surveillance, and earth-shaking variation has occurred.
The IP technology, as a kind of mechanics of communication of basis, has incorporated the every aspect of producing and living, and increasing terminal, platform, system are supported this standard, and becoming the devices interconnect field most important is also most widely used standard.
From the angle of technology, the video monitoring system development is divided into the three generations: the first generation, analog video supervisory control system (CCTV); The second generation: based on " PC+ multimedia card " digital video monitor system (DVR); The third generation: IP based network video monitoring system (IPVS), IP video camera (IP Camera).
The image perception ability strengthen continuously of imageing sensor, the transducer of high-resolution and ultrahigh resolution is widely used, and increasing handheld terminal starts to possess the function that video is checked, contradiction between the original image of large format and the trend toward miniaturization of display screen is obvious all the more, the limited bandwidth of third generation mobile (3G) and family, enterprise network, be difficult to obtain by the limited network bandwidth high definition real-time video of full full resolution, objectively need to carry out more clear and true reappearance to the regional area of remote image.
Summary of the invention:
For the global scene that can catch the camera lens of video camera with high-resolution and ultrahigh resolution transducer and the clear real reproduction of regional area, by the more clear and real reproduction in the small screen terminal under limited network bandwidth condition, the present invention is by the image processing function of image processor, particularly image cropping and zoom function, realize the virtual PTZ system and method based on image scaling and cutting.
The present invention is achieved in that a kind of virtual PTZ system and method based on image scaling and cutting, comprises following main process and step:
Described system: by control terminal, video camera, formed, and by the network interconnection;
The user, by control terminal, carries out Long-distance Control to video camera; Video camera is high-resolution IMAQ, coding, the web-transporting device with image-capable; Video camera is processed the original image collected from imageing sensor by image processor, particularly based on cutting and convergent-divergent, processes, and realizes virtual PTZ system; Control terminal is accepted user's operation, user's operation is converted to PTZ control request the image range of passing back of video camera is carried out to Long-distance Control; Video camera receives PTZ control request after, control type according to PTZ and carry out corresponding operation, if type be translation carry out translation, if type is convergent-divergent carries out zoom operations according to scaling.
Control terminal: formed by terminal hardware, terminal operating system, terminal software;
Terminal hardware: by forming with screen, central processing unit, memory, mixed-media network modules mixed-media;
Terminal software: formed by streaming media module, video decode module, Video Rendering module, control module, user's operational module; Be responsible for connecting video camera, and receive the media stream data of video camera, decoded, play up and export, accept user's operation simultaneously, and user's the PTZ that is converted to is controlled to request, this is controlled to request by the network destined video camera, carry out long-range PTZ control.
Video camera: formed by video camera hardware, camera operation system, camera software;
Video camera hardware: formed by CPU main control chip, memory ram, network interface, camera lens, imageing sensor, image processor, video encoder;
Camera operation system: the embedded OS that the embedded operating system kernel of take is core;
Camera software: by main control module, Media Stream acquisition module, Streaming Media communication module, virtual PTZ module composition.
Virtual PTZ method based on image scaling and cutting, step is as follows:
Step 1: after control terminal captures user's operation, user's operation is converted to PTZ control request and then mails to video camera;
Step 2: video camera detects the type that PTZ controls request after receiving PTZ control request, and the image parameter of taking out current virtual PTZ, be mainly the data of field range, according to the control type, calculates new target field range; PTZ controls the type of request: include but not limited to translation, convergent-divergent;
Step 3: according to new field range, generate new image parameter, new image parameter is set to image processor;
Step 4: after image processor is received new parameter request, image cropping and the zooming parameter of image processor is set, and the image parameter come into force is informed to video camera;
Step 5: video camera upgrades the status data of virtual PTZ, and structure PTZ controls and replys, and control is replied and beamed back control terminal.
Further, the PTZ that the type of described control request is translation controls the x axle of the parameter of request, the translational movement of y axle; Described translational movement can be the field range relative distance ratio with respect to the x axle at current picture visual angle and y axle; Described translational movement can be fixed quantisation ratio, can be also the ratio of User operation behavior Amplitude correlation.
Further, the parameter that the PTZ that the type of described control request is convergent-divergent controls request at least comprises scaling; Described scaling can be fixed quantisation ratio, can be also the ratio of User operation behavior Amplitude correlation.
Further, the PTZ that the type of described control request is translation controls field range computational methods corresponding to request, the viewfinder range x axle of current full picture is that w, y axle are h, the apex coordinate of current field range is (x1, y1), the x axle of current field range is that w1, y axle are h1; New field range apex coordinate, x axial coordinate: (x1+ (x axle translational movement * w1)), y axial coordinate: (y1+ (y axle translational movement * h1)), if check that the x axial coordinate is less than 0 be modified to 0, if then detecting the x axial coordinate is greater than (w-w1) is modified to (w-w1), be less than 0 be modified to 0 if detect the y axial coordinate, if then the y axial coordinate is greater than (h-h1) is modified to (h-h1).
Further, the PTZ that the type of described control request is convergent-divergent controls field range computational methods corresponding to request, the viewfinder range x axle of current full picture is that w, y axle are h, the apex coordinate of current field range is (x1, y1), the x axle of current field range is that w1, y axle are h1, and in required parameter, the scaling value is r, at first scaling value r is revised; New field range summit, the x axial coordinate is: (x1+ (w1/2))-(w1 * r), the y axial coordinate is: (y1+ (h1/2))-(h1 * r), x axle field range is: (w1 * r), y axle field range is: (h1 * r).
Further, modification method to described scaling value r is: if detect (x1+ (w1/2))<(r * w1) r be modified to ((x1+ (w1/2))/w1), if then detect (w-(x1+ (w1/2)))<(r * w1) r be modified to (w-(x1+ (w1/2)))/w1, if detect (y1+ (h1/2))<(r * h1) r be modified to ((y1+ (h1/2))/h1), if then detect (h-(y1+ (h1/2)))<(r * h1) r be modified to (h-(y1+ (h1/2)))/h1, be greater than the maximum ratio that allows to amplify if then detect the r value, this is modified to the maximum magnification ratio value that allows by r.
The accompanying drawing explanation:
Below in conjunction with accompanying drawing, the present invention is described in detail.
Fig. 1 is system schematic
Fig. 2 is the video camera hardware structure diagram
Fig. 3 is the virtual PTZ control flow sequential chart based on image scaling and cutting
Fig. 4 is the translation schematic diagram
Fig. 5 is the zoom operations schematic diagram
Embodiment:
The present invention, by the image processing function of image processor, particularly image cropping and zoom function, realizes the example of the virtual PTZ system and method based on image scaling and cutting, is achieved as follows:
System, as shown in Figure 1: by control terminal (120), video camera (110), formed, and by network (140) interconnected (141);
The user, by control terminal, carries out Long-distance Control to video camera; Video camera is high-resolution IMAQ, coding, the web-transporting device with image-capable; Video camera is processed the original image (101) collected from imageing sensor by image processor, particularly based on cutting and convergent-divergent, processes, and realizes virtual PTZ system; Control terminal is accepted user's operation, user's operation is converted to PTZ control request the image range of passing back (102,103,105) of video camera is carried out to Long-distance Control.
Control terminal: formed by terminal hardware, terminal operating system, terminal software;
Terminal hardware: by forming with screen, central processing unit, memory, mixed-media network modules mixed-media;
Terminal software: formed by streaming media module, video decode module, Video Rendering module, control module, user's operational module; Be responsible for connecting video camera, and receive the media stream data of video camera, decoded, play up and export, accept user's operation simultaneously, and user's the PTZ that is converted to is controlled to request, this is controlled to request by the network destined video camera, carry out long-range PTZ control.
Video camera: formed by video camera hardware, camera operation system, camera software;
Video camera hardware, as shown in Figure 2: by CPU main control chip (201), memory ram (202), network interface (203), camera lens (204), imageing sensor (205), image processor (206), video encoder (207), formed;
Camera operation system: the embedded OS that the embedded operating system kernel of take is core;
Camera software: by main control module, Media Stream acquisition module, Streaming Media communication module, virtual PTZ module composition.
Virtual PTZ method based on image scaling and cutting, as shown in Figure 3, step is as follows:
Step 1: after control terminal captures user's operation, user's operation is converted to PTZ control request and then mails to video camera;
Step 2: video camera detects the type that PTZ controls request after receiving PTZ control request, and the image parameter of taking out current virtual PTZ, be mainly the data of field range, according to the control type, calculates new target field range; PTZ controls the type of request: include but not limited to translation, convergent-divergent;
Step 3: according to new field range, generate new image parameter, new image parameter is set to image processor;
Step 4: after image processor is received new parameter request, image cropping and the zooming parameter of image processor is set, and the image parameter come into force is informed to video camera;
Step 5: video camera upgrades the status data of virtual PTZ, and structure PTZ controls and replys, and control is replied and beamed back control terminal.
Further, the PTZ that the type of described control request is translation controls the x axle of the parameter of request, the translational movement of y axle; Described translational movement can be the field range relative distance ratio with respect to the x axle at current picture visual angle and y axle; Described translational movement can be fixed quantisation ratio, can be also the ratio of User operation behavior Amplitude correlation.
Further, the parameter that the PTZ that the type of described control request is convergent-divergent controls request at least comprises scaling; Described scaling can be fixed quantisation ratio, can be also the ratio of User operation behavior Amplitude correlation.
Further, the PTZ that the type of described control request is translation controls field range computational methods corresponding to request, as shown in Figure 4, the viewfinder range x axle of current full picture is that w, y axle are h, the apex coordinate of current field range is (x1, y1), the x axle of current field range is that w1, y axle are h1; New field range apex coordinate, x axial coordinate: (x1+ (x axle translational movement * w1)), y axial coordinate: (y1+ (y axle translational movement * h1)), if check that the x axial coordinate is less than 0 be modified to 0, if then detecting the x axial coordinate is greater than (w-w1) is modified to (w-w1), be less than 0 be modified to 0 if detect the y axial coordinate, if then the y axial coordinate is greater than (h-h1) is modified to (h-h1).
Further, the PTZ that the type of described control request is convergent-divergent controls field range computational methods corresponding to request, as shown in Figure 5, the viewfinder range x axle of current full picture is that w, y axle are h, the apex coordinate of current field range is (x1, y1), and the x axle of current field range is that w1, y axle are h1, in required parameter, the scaling value is r, at first scaling value r is revised; New field range summit, the x axial coordinate is: (x1+ (w1/2))-(w1 * r), the y axial coordinate is: (y1+ (h1/2))-(h1 * r), x axle field range is: (w1 * r), y axle field range is: (h1 * r).
Further, modification method to described scaling value r is: as shown in Figure 5, if detect (x1+ (w1/2))<(r * w1) r be modified to ((x1+ (w1/2))/w1), if then detect (w-(x1+ (w1/2)))<(r * w1) r be modified to (w-(x1+ (w1/2)))/w1, if detect (y1+ (h1/2))<(r * h1) r be modified to ((y1+ (h1/2))/h1), if then detect (h-(y1+ (h1/2)))<(r * h1) r be modified to (h-(y1+ (h1/2)))/h1, be greater than the maximum ratio that allows to amplify if then detect the r value, this is modified to the maximum magnification ratio value that allows by r.
Claims (9)
1. the present invention is achieved in that a kind of virtual PTZ system and method based on image scaling and reduction,
It is characterized in that, the method comprises following main process and step:
A kind of virtual PTZ system and method based on image scaling and reduction: control terminal, video camera form, and by the network interconnection;
The user, by control terminal, carries out Long-distance Control to video camera; Video camera is high-resolution IMAQ, coding, the web-transporting device with image-capable; Video camera is processed the original image collected from imageing sensor by image processor, particularly based on cutting and convergent-divergent, processes, and realizes virtual PTZ system; Control terminal is accepted user's operation, user's operation is converted to PTZ control request the image range of passing back of video camera is carried out to Long-distance Control; Video camera receives PTZ control request after, control type according to PTZ and carry out corresponding operation, if type be translation carry out translation, if type is convergent-divergent carries out zoom operations according to scaling.
2. control terminal as claimed in claim 1: formed by terminal hardware, terminal operating system, terminal software;
Terminal hardware: by forming with screen, central processing unit, memory, mixed-media network modules mixed-media;
Terminal software: formed by streaming media module, video decode module, Video Rendering module, control module, user's operational module; Be responsible for connecting video camera, and receive the media stream data of video camera, decoded, play up and export, accept user's operation simultaneously, and user's the PTZ that is converted to is controlled to request, this is controlled to request by the network destined video camera, carry out long-range PTZ control.
3. video camera as claimed in claim 1: formed by video camera hardware, camera operation system, camera software;
Video camera hardware: formed by CPU main control chip, memory ram, network interface, camera lens, imageing sensor, image processor, video encoder;
Camera operation system: the embedded OS that the embedded operating system kernel of take is core;
Camera software: by main control module, Media Stream acquisition module, Streaming Media communication module, virtual PTZ module composition.
4. the virtual PTZ method based on image scaling and cutting as claimed in claim 1, step is as follows:
Step 1: after control terminal captures user's operation, user's operation is converted to PTZ control request and then mails to video camera;
Step 2: video camera detects the type that PTZ controls request after receiving PTZ control request, and the image parameter of taking out current virtual PTZ, be mainly the data of field range, according to the control type, calculates new target field range; PTZ controls the type of request: include but not limited to translation, convergent-divergent;
Step 3: according to new field range, generate new image parameter, new image parameter is set to image processor;
Step 4: after image processor is received new parameter request, image cropping and the zooming parameter of image processor is set, and the image parameter come into force is informed to video camera;
Step 5: video camera upgrades the status data of virtual PTZ, and structure PTZ controls and replys, and control is replied and beamed back control terminal.
5. the control request that type as claimed in claim 1 is translation, further:
The PTZ that the type of described control request is translation controls the translational movement that the parameter of asking at least comprises x axle, y axle;
Described translational movement can be the field range relative distance ratio with respect to the x axle at current picture visual angle and y axle;
Described translational movement can be fixed quantisation ratio, can be also the ratio of User operation behavior Amplitude correlation.
6. the control request that type as claimed in claim 1 is convergent-divergent, further:
The parameter that the PTZ that the type of described control request is convergent-divergent controls request at least comprises scaling;
Described scaling can be fixed quantisation ratio, can be also the ratio of User operation behavior Amplitude correlation.
7. the control request that type as claimed in claim 1 is translation, further:
The PTZ that the type of described control request is translation controls field range computational methods corresponding to request, the viewfinder range x axle of current full picture is that w, y axle are h, the apex coordinate of current field range is (x1, y1), and the x axle of current field range is that w1, y axle are h1; New field range apex coordinate, x axial coordinate: (x1+ (x axle translational movement * w1)), y axial coordinate: (y1+ (y axle translational movement * h1)), if check that the x axial coordinate is less than 0 be modified to 0, if then detecting the x axial coordinate is greater than (w-w1) is modified to (w-w1), be less than 0 be modified to 0 if detect the y axial coordinate, if then the y axial coordinate is greater than (h-h1) is modified to (h-h1).
8. control request as claimed in claim 1, further:
The PTZ that the type of described control request is convergent-divergent controls field range computational methods corresponding to request, the viewfinder range x axle of current full picture is that w, y axle are h, the apex coordinate of current field range is (x1, y1), the x axle of current field range is that w1, y axle are h1, in required parameter, the scaling value is r, at first scaling value r is revised; New field range summit, the x coordinate is: (x1+ (w1/2))-(w1 * r), the y coordinate is: (y1+ (h1/2))-(h1 * r), the x wheelbase is from being: (w1 * r), the y wheelbase is from being: (h1 * r).
9. the described scaling of control request as claimed in claim 1, further:
Modification method to described scaling value r is: if detect (x1+ (w1/2))<(r * w1) r be modified to ((x1+ (w1/2))/w1), if then detect (w-(x1+ (w1/2)))<(r * w1) r be modified to (w-(x1+ (w1/2)))/w1, if detect (y1+ (h1/2))<(r * h1) r be modified to ((y1+ (h1/2))/h1), if then detect (h-(y1+ (h1/2)))<(r * h1) r be modified to (h-(y1+ (h1/2)))/h1, be greater than the maximum ratio that allows to amplify if then detect the r value, this is modified to the maximum magnification ratio value that allows by r.
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Application publication date: 20131211 |