CN102980517A - Monitoring measurement method - Google Patents

Abstract

The invention discloses a monitoring measurement method which comprises the step as follows: (1) obtaining the distance between a video camera to a target, (2) adjusting the shooting direction and the optical zoom of the video camera, enabling the target to fill the whole screen in the horizontal direction, and recording the current zoom value of the video camera, (3) adjusting the shooting direction and the optical zoom of the video camera, enabling the target to fill the whole screen in the vertical direction, and recording the current zoom value of the video camera, (4) confirming field angles, in the horizontal direction and the vertical direction, corresponding to the camera according to zoom values, of the video camera, obtained in the step (2) and the step (3), (5) calculating the length and the height of the target according to the distance, from the video camera to the target, obtained in the step (1) and the field angles, in the horizontal direction and the vertical direction, confirmed in the step (4). The method can be used to calculate the length or the height of the target as long as the distance from the video camera to the target is obtained. Due to the fact that no hardware device needs adding, the method does not increase any system cost at the time when the functions of a monitoring system is added.

Description

A kind of method for monitoring measuring

Technical field

The present invention relates to field of video monitoring, especially a kind of method for monitoring measuring.

Background technology

Monitoring camera-shooting is monitor mode the most widely in the protection and monitor field.Camera monitoring system can be shot with video-corder field condition, and the monitor staff need not to go on patrol on the spot and can establish each by demonstration and monitor field condition, and a monitor staff can carry out Real Time Monitoring simultaneously to a plurality of monitoring place.The video information of camera monitoring system monitoring, generally be to obtain by the monitor terminal that is installed in the monitoring place, the picture at the camera acquisition scene in the monitor terminal is also sent it back to control center, for the monitor staff scene is monitored, and has demonstration directly perceived, the characteristics such as real-time.

But, the video information that video camera catches is two-dimensional signal, generally can only observe monitoring objective, and can't distance and the size of monitoring objective be judged, at this moment, the monitor staff can only rule of thumb judge monitoring objective distance and the size etc. information.But under some special screne, such as remote monitor or in some area, mountain area, the monitor staff is difficult to judge distance and the size of monitoring objective, and so just giving accurately, monitoring has brought difficulty.As camera monitoring system, the actual range and the size that obtain different target in the monitoring image are very important supplementarys.

In order to obtain this range information, some have accurately increased the auxiliary distance measuring equipment that methods such as utilizing laser or ultrasound wave is carried out range determination in a lot of camera monitoring systems of monitoring, the monitor terminal that distance measurement function is arranged in perhaps installing, distance measurement function is achieved, but the actual size that how to obtain different target in the monitoring image can only estimate roughly according to experience that still giving accurately, monitoring brings very large inconvenience.

Summary of the invention

The objective of the invention is to overcome defective of the prior art, as long as just provide a kind of obtain the video camera range-to-go can calculate target length or height or and target be in the method for monitoring measuring of distance between conplane any two points.

For addressing the above problem, a kind of method for monitoring measuring of the present invention may further comprise the steps:

1) obtains the video camera range-to-go;

2) shooting direction and the optical zoom of adjustment video camera make the target level direction be full of whole screen, record current camera zoom value;

3) shooting direction and the optical zoom of adjustment video camera make the target vertical direction be full of whole screen, record current camera zoom value;

4) according to step 2), the camera zoom value that records in the step 3) determines the horizontal and vertical direction field angle that video camera is corresponding;

5) according to the horizontal and vertical direction field angle of determining in the video camera range-to-go that obtains in the step 1) and the step 4), calculate length and the height of target.

Determine that according to the camera zoom value method of video camera horizontal and vertical direction field angle is in the described step 4): zoom value and field angle corresponding relation according to video camera self are set up form in advance, and tabling look-up according to current camera zoom value obtains.

Determine that according to the camera zoom value method of video camera horizontal and vertical direction field angle is in the described step 4): set up in advance camera zoom value and field angle correspondence table by method of testing, tabling look-up according to current camera zoom value obtains.

A kind of method for monitoring measuring may further comprise the steps:

11) obtain the video camera range-to-go;

12) adjust shooting direction and the optical zoom of video camera, make the horizontal direction that is in two some lines in the same plane with target be full of whole screen, record current camera zoom value; Described and target are in same plane and refer to, are in the plane of vertical direction with video camera to straight line that target connects, and target and described 2 are in together in this plane;

13) shooting direction and the optical zoom of adjustment video camera make the vertical direction of two some lines described in the step 12) be full of whole screen, record current camera zoom value;

14) determine the horizontal and vertical direction field angle that video camera is corresponding according to the camera zoom value that records in step 12), the step 13);

15) according to the horizontal and vertical direction field angle of determining in the video camera range-to-go that obtains in the step 11) and the step 14), calculate described horizontal range and vertical range at 2, and calculate the distance of described point-to-point transmission.

Adopt method for monitoring measuring of the present invention, compared with prior art have following beneficial effect: the method is applied widely, degree of accuracy is high, as long as obtain the video camera range-to-go just can calculate target length or the height or and target be in distance between conplane any two points, and need not increase any hardware unit, when having increased the supervisory system function, not increase any system cost.

Description of drawings

Fig. 1 is the process flow diagram of method for monitoring measuring embodiment one of the present invention.

Fig. 2 is the process flow diagram of method for monitoring measuring embodiment two of the present invention.

Fig. 3 is that the present invention concerns synoptic diagram according to the trigonometric function between video camera range-to-go and the camera field of view angle;

Fig. 4 is the calculating synoptic diagram of distance between two points in the embodiment of the invention two.

Embodiment

In order to make those skilled in the art person understand better technical solution of the present invention, the present invention is described in further detail below in conjunction with drawings and embodiments.

Embodiment one:

As shown in Figure 1, a kind of method for monitoring measuring of the present invention may further comprise the steps:

1) obtains the video camera range-to-go;

The method of obtaining the video camera range-to-go includes but not limited to: the auxiliary distance measuring equipments such as use ultrasonic ranging or laser ranging obtain or according to camera zoom, focus on and obtain apart from triadic relation's calculating; The video camera range-to-go is more accurate, the target length of calculating or height or and target to be between conplane any two points distance just more accurate.

2) shooting direction and the optical zoom of adjustment video camera make the target level direction be full of whole screen, record current camera zoom value;

In the camera monitoring system usually all with servomechanism installation, servomechanism installation can be according to the direction of monitor staff's appointment, the direction that the angular setting video camera is taken, for example in ball-shaped cloud platform, video camera can be observed all positions below the The Cloud Terrace plane of living in by cloud platform rotation.

When monitoring objective can't make it be full of screen by adjustment shooting direction and optical zoom, should guarantee as far as possible that object area occupied in shooting picture is as far as possible large, optical zoom should be adjusted to maximum.

3) shooting direction and the optical zoom of adjustment video camera make the target vertical direction be full of whole screen, record current camera zoom value;

4) according to step 2), the camera zoom value that records in the step 3) determines the horizontal and vertical direction field angle that video camera is corresponding;

By can read the camera zoom value with camera communication, the zoom value of video camera is corresponding unique horizontal field of view angle and vertical field of view angle all.Obtain the camera zoom value the method for corresponding video camera horizontal and vertical direction field angle, the one, set up in advance form according to zoom value and the field angle corresponding relation of video camera self, table look-up and can obtain according to current camera zoom value; The 2nd, set up in advance camera zoom value and field angle correspondence table by the method for test, tabling look-up according to current camera zoom value obtains.

5) according to the horizontal and vertical direction field angle of determining in the video camera range-to-go that obtains in the step 1) and the step 4), calculate length and the height of target.

Concern synoptic diagram according to trigonometric function shown in Figure 3:

Letter d represents the video camera range-to-go, and θ represents current video camera horizontal field of view angle, and L represents the corresponding physical size in horizontal field of view angle, i.e. the length of target so, has following relation:

$\tan \frac{\mathrm{\θ}}{2}=\frac{L/2}{d}$

Thus, the length of target can be expressed as:

$L=2d\·\tan \frac{\mathrm{\θ}}{2}$

In like manner, suppose that β represents current video camera vertical field of view angle, M representative is hung down and is looked squarely the corresponding physical size in rink corner, and namely the height of target calculates the corresponding size in vertical field of view angle, i.e. the height of target, and so, the height of target can be expressed as:

$M=2d\·\tan \frac{\mathrm{\β}}{2}$

Embodiment two:

As shown in Figure 2, a kind of method for monitoring measuring may further comprise the steps:

11) obtain the video camera range-to-go;

12) adjust shooting direction and the optical zoom of video camera, make the horizontal direction that is in two some a, b in the same plane with target be full of whole screen, record current camera zoom value; Described and target are in same plane and refer to, are in the plane of vertical direction with video camera to straight line that target connects, and target and described 2 are in together in this plane;

13) shooting direction and the optical zoom of adjustment video camera make two some vertical direction described in the step 12) be full of whole screen, record current camera zoom value;

14) determine the horizontal and vertical direction field angle that video camera is corresponding according to the camera zoom value that records in step 12), the step 13);

15) according to the horizontal and vertical direction field angle of determining in the video camera range-to-go that obtains in the step 11) and the step 14), calculate described horizontal range and vertical range at 2, and calculate the distance of described point-to-point transmission.

The horizontal range p of described 2 a, b and vertical range t can draw by the computing method among the embodiment one; As shown in Figure 4, according to Pythagorean theorem, can being expressed as apart from s of point-to-point transmission:

$s=\sqrt{p^2+t^2}$

When described 2 lines can't make it be full of screen by adjustment shooting direction and optical zoom, should guarantee as far as possible that 2 lines length in shooting picture is as far as possible large, optical zoom should be adjusted to maximum, at this moment, can according to 2 lines in screen shared level than asking according to above-mentioned formula with vertical ratio.

The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (4)

1. method for monitoring measuring may further comprise the steps:

1) obtains the video camera range-to-go;

2) shooting direction and the optical zoom of adjustment video camera make the target level direction be full of whole screen, record current camera zoom value;

3) shooting direction and the optical zoom of adjustment video camera make the target vertical direction be full of whole screen, record current camera zoom value;

4) according to step 2), the camera zoom value that records in the step 3) determines the horizontal and vertical direction field angle that video camera is corresponding;

5) according to the horizontal and vertical direction field angle of determining in the video camera range-to-go that obtains in the step 1) and the step 4), calculate length and the height of target.

2. method for monitoring measuring as claimed in claim 1, it is characterized in that: determine that according to the camera zoom value method of video camera horizontal and vertical direction field angle is in the described step 4): zoom value and field angle corresponding relation according to video camera self are set up form in advance, and tabling look-up according to current camera zoom value obtains.

3. method for monitoring measuring as claimed in claim 1, it is characterized in that: determine that according to the camera zoom value method of video camera horizontal and vertical direction field angle is in the described step 4): set up in advance camera zoom value and field angle correspondence table by method of testing, tabling look-up according to current camera zoom value obtains.

4. method for monitoring measuring may further comprise the steps:

11) obtain the video camera range-to-go;

12) adjust shooting direction and the optical zoom of video camera, make the horizontal direction that is in two some lines in the same plane with target be full of whole screen, record current camera zoom value; Described and target are in same plane and refer to, are in the plane of vertical direction with video camera to straight line that target connects, and target and described 2 are in together in this plane;

13) shooting direction and the optical zoom of adjustment video camera make the vertical direction of two some lines described in the step 12) be full of whole screen, record current camera zoom value;

14) determine the horizontal and vertical direction field angle that video camera is corresponding according to the camera zoom value that records in step 12), the step 13);

15) according to the horizontal and vertical direction field angle of determining in the video camera range-to-go that obtains in the step 11) and the step 14), calculate described horizontal range and vertical range at 2, and calculate the distance of described point-to-point transmission.

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