CN103179378A - Video monitoring device with privacy sheltering function and privacy sheltering method - Google Patents

Abstract

The invention discloses a video monitoring device with a privacy sheltering function and a privacy sheltering method. The video monitoring device comprises a monitoring camera, a master chip of a cradle head, a video image processing unit and a monitor; the monitoring camera is used for acquiring video images; the master chip of the cradle head is used for setting sheltered area information and electronic sheltering blocks; the video image processing unit is used for superimposing the non-transparent electronic sheltering blocks at corresponding positions of each video image according to the sheltered area information; and the monitor is used for outputting the video images superimposed with the electronic sheltering blocks. The video monitoring device and the privacy sheltering method have the advantages that shortcomings in the prior art are overcome, and the cradle head can realize a privacy sheltering function without carrying a monitoring camera with a privacy sheltering function; frequent communication between a master chip of front-end equipment and the camera is omitted when the sheltering blocks are refreshed, accordingly, shortcomings that existing sheltering blocks cannot rack privacy areas timely and a sheltering effect is not perfect due to an insufficient communication rate are overcome, and the flexibility, the reliability and the practicality of the privacy sheltering function during usage are greatly improved.

Description

Have privacy and block video monitoring apparatus and the privacy occlusion method of function

Technical field

The invention belongs to field of video monitoring, relate in particular to a kind of can to adopt and video image is realized front end video monitoring apparatus and the privacy occlusion method that privacy is blocked.

Background technology

Along with the development of field of video monitoring, the function of rig camera is also more powerful, from just realizing merely the collection of video image at first, has had by now the function of the hommizations such as, automatic focus anti-shake such as image." privacy is blocked " is exactly a kind of very practical rig camera miscellaneous function that developed recently gets up.Privacy is blocked function and is referred to the user when video monitoring is carried out in certain zone, and the not monitored fixed target enforcement image of not answering that rig camera is set the monitored space intra domain user blocks.When for example certain solitary building being carried out video monitoring, the window of building is the privacy area that the user sets, and what the user finally obtained on monitor so is that privacy area has been applied the image that opaque electronics blocks piece.The user can monitor the overall picture of entire building like this, but can not see the details in window, has both reached the purpose of monitoring, has protected again monitored person's privacy.Early stage privacy blocks that function just realizes for the video camera that carries tight shot, namely blocks just to need not to change after scope that piece blocks is set again.Along with the application of zoom lens is more and more extensive, the object that carries in the video camera institute pickup image of zoom lens can be exaggerated along with the variation of lens focus or dwindle, this also will change along with the variation of objects in images size with regard to the scope that requires to block piece, to guarantee that object is in block (this function is designated hereinafter simply as " zoom interlock ") in scope of blocking piece all the time.In actual applications, camera lens and video camera majority are mounted on the front end video monitoring equipments such as The Cloud Terrace or ball machine (following all take " The Cloud Terrace " as example).The Cloud Terrace rotation on level or pitch orientation can cause the visual field direction of video camera that corresponding the variation occurs, in monitor, the position of privacy area has also just produced variation, and this just requires to block the position of piece in screen also will change (this function is designated hereinafter simply as " position interlock ") thereupon.

Present privacy is blocked function and can only be realized on integrated camera.Because camera lens and the video camera of integrated camera is packaged together, video camera can directly obtain the focal length parameter of camera lens, can independently realize easily the zoom interlock.Need video camera and The Cloud Terrace constantly to keep in communication for the position interlock, calculated by The Cloud Terrace and block the coordinate of piece and send to video camera, the position that video camera blocks piece according to the coordinate information adjustment that receives.The implementation of this position interlock requires The Cloud Terrace and the frequent communication of video camera, in fact because the processing speed of The Cloud Terrace master chip is limited, be difficult to satisfy the demand with the frequent communication of video camera, block piece and follow the tracks of privacy area and exist and postpone thereby cause, affect the effect that privacy is blocked.For application scenario split type camera lens and video camera very widely, because video camera can't be known the focal length parameter of camera lens and also just can't realize zoom interlock, common this video camera does not just support privacy to block function yet, blocks function so split type camera lens and video camera can't be realized privacy.By above analysis as can be known, the realization that present privacy is blocked function has significant limitation, be that The Cloud Terrace only has to carry and has privacy and block the integrated camera of function and could realize that privacy blocks function, and due to the restriction of The Cloud Terrace master chip communication speed, the effect that often causes privacy to block is undesirable.

Summary of the invention

The invention provides a kind of front end video monitoring apparatus, be intended to solve the limitation that existing implementation method exists, be that The Cloud Terrace only has to carry and has privacy and block the integrated camera of function and could realize that privacy blocks function, and due to the restriction of The Cloud Terrace master chip communication speed, the effect that often causes privacy to block is undesirable.

A kind of have a video monitoring apparatus that privacy is blocked function, comprising:

Rig camera is used for gathering video image;

The The Cloud Terrace master chip be used for to be set occlusion area (being that actual scene needs the zone of blocking) information and electronics block;

The video image processing unit is used for according to described occlusion area information, at the opaque electronics block of the relevant position of described video image stack;

Monitor is used for the video image that output is superimposed with the electronics block.

Described The Cloud Terrace master chip is circumscribed with for the input unit of setting occlusion area information and electronics block.

The privacy area rectangle that in the present invention, video image processing unit reception The Cloud Terrace master chip sends blocks the coordinate figure (be occlusion area information) of four summits of piece in the video image coordinate system, according to coordinate figure, the opaque electronics block of relevant position in rig camera gathers video image stack, thus realize that privacy blocks function.

The present invention also provides a kind of privacy occlusion method of video image, comprises the steps:

(1) the focal length parameter, occlusion area (occlusion area in actual scene) that records current monitoring camera lens in the video image coordinate system coordinate figure and monitoring camera lens towards level angle value and luffing angle value;

(2) according to the coordinate figure of occlusion area, the stack corresponding electronics block of shape and carry out video output in current video image;

(3) every the scheduled time, obtain the focal length parameter of a monitoring camera lens and monitoring camera lens towards level angle value and luffing angle value;

(4) data that obtain according to step (3), recomputate the coordinate figure of occlusion area in the current video image coordinate system, the corresponding electronics block of the shape that superposes in current video image according to this coordinate figure also carries out video output, thereby the privacy that realizes video image is blocked.

The privacy occlusion method of video image of the present invention can utilize video monitoring apparatus of the present invention to realize, concrete steps are as follows:

(1) the The Cloud Terrace master chip record current monitoring camera lens focal length parameter, occlusion area (occlusion area in actual scene) in the video image coordinate system coordinate figure and monitoring camera lens towards level angle value and luffing angle value; And the coordinate figure of occlusion area in the video image coordinate system is sent to the video image processing unit, the video image processing unit is set and be sent to wherein said occlusion area by the The Cloud Terrace master chip;

(2) the video image processing unit is according to the coordinate figure of occlusion area, the stack corresponding electronics block of shape and carry out video output in current video image, and the video image processing unit is set and be sent to this electronics block by the The Cloud Terrace master chip;

(3) every the scheduled time, the The Cloud Terrace master chip obtain the focal length parameter of a monitoring camera lens and monitoring camera lens towards level angle value and luffing angle value;

(4) data that obtain according to step (3), the The Cloud Terrace master chip recomputates the coordinate figure of occlusion area in the current video image coordinate system, send result of calculation to the video image processing unit, superpose in current video image according to this coordinate figure corresponding electronics block of shape and carry out video output of video image processing unit, thus the privacy that realizes video image is blocked.

As preferably, described occlusion area and electronics block are rectangle, are convenient to calculate and stack.The coordinate figure of described occlusion area this moment in the current video image coordinate system is the coordinate figure on occlusion area four summits in the current video image coordinate system.

The present invention overcomes the prior art deficiency, The Cloud Terrace needn't be carried have privacy to block the rig camera of function and just can realize that privacy blocks function.And need not headend equipment master chip and the frequent communication of video camera owing to blocking refreshing of piece, avoided having improved greatly privacy and having blocked flexibility, reliability and the practicality that function is used because the piece that blocks that the communication speed deficiency causes is followed the tracks of the shortcoming that privacy area is untimely, occlusion effect is undesirable.

Description of drawings

Fig. 1 is the structured flowchart of video monitoring apparatus of the present invention;

Fig. 2 is video image coordinate system schematic diagram of the present invention;

Fig. 3 is the flow chart that video monitoring apparatus of the present invention is realized the method that privacy is blocked;

Fig. 4 is the imaging schematic diagram of rig camera when lens focus is initial value;

Fig. 5 is the imaging schematic diagram of rig camera after the lens focus value changes;

Fig. 6 blocks the schematic diagram that the piece central point is offset with cloud platform rotation.

Embodiment

In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.

As shown in Figure 1, the video monitoring apparatus that the embodiment of the present invention provides comprises:

Rig camera is used for gathering video image;

The Cloud Terrace master chip (LPC2138) is used for sending occlusion area information;

Video image processing unit (MAX7456) is used for according to described occlusion area information, at the opaque electronics block of the relevant position of described video image stack;

Monitor is used for the video image that output is superimposed with described electronics block.

To adopt and video image realizes that the device of the method that privacy is blocked can adopt following hardware configuration to move: for example the The Cloud Terrace master chip is connected with the video image processing unit, the video image processing unit is under the control of The Cloud Terrace master chip, export to monitor after the video image of rig camera input is processed, the The Cloud Terrace master chip is circumscribed with for the input unit (for example keyboard) of setting occlusion area information and electronics block.

As shown in Figure 3, the privacy occlusion method of video image of the present invention comprises:

(1) the The Cloud Terrace master chip record current monitoring camera lens focal length parameter, occlusion area (need in actual scene block zone) in the video image coordinate system coordinate figure and monitoring camera lens towards level angle value and luffing angle value; The video image processing unit is set and be sent to occlusion area by the The Cloud Terrace master chip;

As shown in Figure 2, the The Cloud Terrace master chip control the video image processing unit with camera acquisition to video image respectively be divided into equidistant interval in the horizontal direction with on vertical direction, namely set up a two-dimensional coordinate system.Suppose equidistantly to be divided on horizontal direction X interval, equidistantly be divided into Y interval on vertical direction, entire image just has been divided into X * Y coordinate position (being designated hereinafter simply as " video image coordinate system ") so.

The user control The Cloud Terrace level, pitch position make the central point of privacy area move to the video image center and set block piece after, the The Cloud Terrace master chip obtains focal length value f0, level angle P0, the luffing angle T0 of The Cloud Terrace of camera lens when setting occlusion area.The The Cloud Terrace master chip obtains when setting occlusion area, and rectangle blocks piece coordinate A (x1, y1), B (x2, y2), C (x3, y3), the D (x4, y4) of four summits in the video image coordinate system.

(2) the video image processing unit is according to the coordinate figure of occlusion area, the stack corresponding electronics block of shape and carry out video output in current video image, and the video image processing unit is set and be sent to this electronics block by the The Cloud Terrace master chip;

(3) every the scheduled time, the The Cloud Terrace master chip obtain the focal length parameter of a monitoring camera lens and monitoring camera lens towards level angle value and luffing angle value;

The The Cloud Terrace master chip detects whether arrive the image refreshing time, and take pal video as example, video image refreshes 25 times each second, and namely 40ms refreshes once.The The Cloud Terrace master chip only needs every 40ms to upgrade the coordinate figure of primary occlusion piece, and controls the video image processing unit at respective regions stack electronics block, just can guarantee to block piece and video image synchronous refresh, has just guaranteed that also the privacy area piece that is blocked all the time blocks.So when arriving image refreshing after the time, the The Cloud Terrace master chip is controlled the video image processing unit opaque electronics link stopper that superposes in take ABCD as the rectangular area that the summit was surrounded, be video image after privacy area is blocked thereby make what obtain on monitor.After privacy area stack electronics block, the The Cloud Terrace master chip obtains once the focal length value f1 of current camera lens, level angle P1, the luffing angle T1 of The Cloud Terrace every a video refresh time, and whether f0, P0, the T0 of judgement and initial set point change.

(4) data that obtain according to step (3), the The Cloud Terrace master chip recomputates the coordinate figure of occlusion area in the current video image coordinate system, superpose in current video image according to this coordinate figure corresponding electronics block of shape and carry out video output of video image processing unit, thus the privacy that realizes video image is blocked.

As the focal length parameter of monitoring camera lens and monitoring camera lens towards level angle value and the luffing angle value ABCD that do not have to change when controlling the video image processing unit take initial setting be the summit, the opaque electronics link stopper of stack in the rectangular area that surrounds, as change and recomputate rectangle and block four apex coordinate U (m1 of piece, n1), V (m2, n2), W (m3, n3), X (m4, n4), and take UVWX as the summit, the opaque electronics block of stack in the rectangular area that surrounds.

Recomputate detailed process as follows:

The opposite side that blocks piece due to rectangle is equal in length, so the x direction of principal axis only only calculates take the AC limit as example take the AB limit as example, y direction of principal axis.

The computing formula of AB length of side a is:

a＝x2-x1 (1)

The computing formula of AC length of side c is:

c＝y3-y1 (2)

As shown in Figure 4, length is that the object MN of H is F apart from camera lens, and camera lens is conceptualized as convex lens, MN at the distance camera lens on by the video camera of f2 the length of one-tenth image A B be h2.

The computing formula of h2 is:

$\mathrm{<figure-callout\; id="2"\; label="h"\; filenames="HDA0000124768690000041.png"\; state="\{\{state\}\}">h</figure-callout>}2=\frac{f2}{F}\&times;H---\left(3\right)$

As shown in Figure 5, after zoom lens changes focal length, length be the object MN of H at the distance camera lens on by the video camera of f3 the length of one-tenth image UV be h3.

The computing formula of h3 is:

$h3=\frac{f3}{F}\&times;H---\left(4\right)$

Formula (4) can get divided by formula (3):

$h3=\frac{f3}{\mathrm{<figure-callout\; id="2"\; label="f"\; filenames="HDA0000124768690000041.png"\; state="\{\{state\}\}">f</figure-callout>}2}\&times;h2---\left(5\right)$

Focal length value f0 when blocking piece in embodiment and set, the focal length value f1 after changing, the length c substitution formula (5) on length a, the AC limit on AB limit when blocking piece and setting, the length w that draws length u, the UW limit on UV limit after blocking piece and changing is:

$u=\frac{f1}{\mathrm{<figure-callout\; id="0"\; label="f"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">f</figure-callout>}0}\&times;(x2-x1)---\left(6\right)$

$w=\frac{f1}{\mathrm{<figure-callout\; id="0"\; label="f"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">f</figure-callout>}0}\&times;(y3-y1)---\left(7\right)$

During setting occlusion area that the The Cloud Terrace master chip reads, The Cloud Terrace level angle P0, luffing angle T0 are carried the RC level of camera field of view, luffing angle by The Cloud Terrace.Because when setting privacy area, the central point of privacy area overlaps with the video image center, and the angle value that reads so at this moment blocks the angle at piece center when namely setting occlusion area.As shown in Fig. 6 (in figure, arrow X represents the human eye direction), take horizontal direction as example, when setting occlusion area, block the some S on the corresponding actual object MN of central point Q of piece on video image.Carrying the video camera along continuous straight runs and turning clockwise after α ° when being in The Cloud Terrace that O orders, point R imaging point P on video camera on actual object MN will be in the center of video image, see that from the human eye direction original central point Q is QP in the distance that video image moves right, that is to say that whole to block the distance that piece moves right be QP.

The computing formula of horizontal direction anglec of rotation α is:

α＝|P1-P0| (8)

On video image, the computing formula of Q point displacement QP is:

QP＝f×tan(|P1-P0|) (9)

After blocking piece and setting, when the current lens focus value f1 that reads when single-chip microcomputer, level angle P1, the luffing angle T1 of The Cloud Terrace and set point are inconsistent.Suppose that the The Cloud Terrace horizontal direction angle value that turns clockwise increases, and sees that from the human eye direction piece that blocks on video image moves right; The The Cloud Terrace vertical direction rotates up angle value to be increased, and sees that from the human eye direction piece that blocks on video image moves down.

The computing formula of newly blocking the horizontal coordinate ml of piece summit U is:

$m1=\&lsqb;\frac{\mathrm{<figure-callout\; id="2"\; label="X"\; filenames="HDA0000124768690000041.png"\; state="\{\{state\}\}">X</figure-callout>}}{2}+\left(\frac{\mathrm{P1}-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0}{|P1-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0|}\right)\&times;\mathrm{QP}\&rsqb;-\frac{u}{2}---\left(10\right)$

Bring formula (6) and formula (9) into formula (10):

$m1=\&lsqb;\frac{\mathrm{<figure-callout\; id="2"\; label="X"\; filenames="HDA0000124768690000041.png"\; state="\{\{state\}\}">X</figure-callout>}}{2}+\left(\frac{P1-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0}{|P1-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0|}\right)\&times;f1\&times;\tan \left(\right|P1-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0\left|\right)\&rsqb;-\frac{(x2-x1)\&times;f1}{2\&times;f0}---\left(11\right)$

In formula, X is the interval number that MAX7456 divides in the horizontal direction to video image; F0 and P0 are focal length value and the The Cloud Terrace level angle of camera lens when setting privacy area; F1 and P1 are focal length value and the The Cloud Terrace level angle of current camera lens; X1 and x2 are that rectangle blocks the coordinate figure of two summits of piece on video image coordinate system x axle.

The computing formula of newly blocking the vertical coordinate n1 of piece summit U is:

$n1=\&lsqb;\frac{\mathrm{<figure-callout\; id="2"\; label="Y"\; filenames="HDA0000124768690000041.png"\; state="\{\{state\}\}">Y</figure-callout>}}{2}+\left(\frac{T1-\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">T</figure-callout>}0}{|T1-\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">T</figure-callout>}0|}\right)\&times;f1\&times;\tan \left(\right|T1-\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">T</figure-callout>}0\left|\right)\&rsqb;-\frac{(y3-y1)\&times;f1}{2\&times;f0}---\left(12\right)$

In formula, Y is the interval number that MAX7456 divides in the vertical direction to video image; F0 and T0 are focal length value and the The Cloud Terrace vertical angle of camera lens when setting privacy area; F1 and T1 are focal length value and the The Cloud Terrace vertical angle of current camera lens; Y1 and y3 are that rectangle blocks the coordinate of two summits of piece on video image coordinate system y axle.In like manner can calculate V (m2, n2), W (m3, n3), X (m4, n4) each point coordinate figure, computing formula is as follows:

$\mathrm{<figure-callout\; id="2"\; label="m"\; filenames="HDA0000124768690000041.png"\; state="\{\{state\}\}">m</figure-callout>}2=\&lsqb;\frac{\mathrm{<figure-callout\; id="2"\; label="X"\; filenames="HDA0000124768690000041.png"\; state="\{\{state\}\}">X</figure-callout>}}{2}+\left(\frac{P1-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0}{|P1-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0|}\right)\&times;f1\&times;\tan \left(\right|P1-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0\left|\right)\&rsqb;+\frac{(x2-x1)\&times;f1}{2\&times;f0}---\left(\text{13}\right)$

$\mathrm{<figure-callout\; id="2"\; label="n"\; filenames="HDA0000124768690000041.png"\; state="\{\{state\}\}">n</figure-callout>}2=\&lsqb;\frac{\mathrm{<figure-callout\; id="2"\; label="Y"\; filenames="HDA0000124768690000041.png"\; state="\{\{state\}\}">Y</figure-callout>}}{2}+\left(\frac{T1-\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">T</figure-callout>}0}{|T1-\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">T</figure-callout>}0|}\right)\&times;f1\&times;\tan \left(\right|T1-\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">T</figure-callout>}0\left|\right)\&rsqb;-\frac{(y4-y2)\&times;f1}{2\&times;f0}---\left(14\right)$

$m3=\&lsqb;\frac{\mathrm{<figure-callout\; id="2"\; label="X"\; filenames="HDA0000124768690000041.png"\; state="\{\{state\}\}">X</figure-callout>}}{2}+\left(\frac{P1-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0}{|P1-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0|}\right)\&times;f1\&times;\tan \left(\right|P1-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0\left|\right)\&rsqb;-\frac{(x4-x3)\&times;f1}{2\&times;f0}---\left(15\right)$

$n3=\&lsqb;\frac{\mathrm{<figure-callout\; id="2"\; label="Y"\; filenames="HDA0000124768690000041.png"\; state="\{\{state\}\}">Y</figure-callout>}}{2}+\left(\frac{T1-\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">T</figure-callout>}0}{|T1-\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">T</figure-callout>}0|}\right)\&times;f1\&times;\tan \left(\right|T1-\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">T</figure-callout>}0\left|\right)\&rsqb;+\frac{(y3-y1)\&times;f1}{2\&times;f0}---\left(16\right)$

$m4=\&lsqb;\frac{\mathrm{<figure-callout\; id="2"\; label="X"\; filenames="HDA0000124768690000041.png"\; state="\{\{state\}\}">X</figure-callout>}}{2}+\left(\frac{P1-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0}{|P1-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0|}\right)\&times;f1\&times;\tan \left(\right|P1-\mathrm{<figure-callout\; id="0"\; label="P"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">P</figure-callout>}0\left|\right)\&rsqb;+\frac{(x4-x3)\&times;f1}{2\&times;f0}---\left(17\right)$

$n4=\&lsqb;\frac{\mathrm{<figure-callout\; id="2"\; label="Y"\; filenames="HDA0000124768690000041.png"\; state="\{\{state\}\}">Y</figure-callout>}}{2}+\left(\frac{T1-\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">T</figure-callout>}0}{|T1-\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">T</figure-callout>}0|}\right)\&times;f1\&times;\tan \left(\right|T1-\mathrm{<figure-callout\; id="0"\; label="T"\; filenames="HDA0000124768690000021.png"\; state="\{\{state\}\}">T</figure-callout>}0\left|\right)\&rsqb;+\frac{(y4-y2)\&times;f1}{2\&times;f0}---\left(18\right)$

In sum, as long as the master chip of front end watch-dog gets the focal length value of camera lens that watch-dog carries when setting privacy area, level angle value and luffing angle value, the rectangle of the camera field of view that carries blocks the coordinate figure on four summits of piece, just can be by controlling connected video image processing unit at the opaque electronics block of the relevant position of video image that video camera gathers stack.The master chip of front end watch-dog is by the focal length value that obtains current time camera lens that watch-dog carries, level angle value and the luffing angle value of the camera field of view that carries, just can block the new coordinate figure on four summits of piece by the calculative determination current rectangle, can the level and smooth smooth privacy that realizes block function by controlling connected video image processing unit at the opaque electronics block of the relevant position of video image that video camera gathers stack.

The present invention overcomes the prior art deficiency, makes headend equipment to carry to have privacy to block the rig camera of function and just can realize that privacy blocks function.And need not headend equipment master chip and the frequent communication of video camera owing to blocking refreshing of piece, having avoided the piece that blocks that causes due to the communication speed deficiency, to follow the tracks of privacy area untimely, the shortcoming that occlusion effect is undesirable.Improve greatly privacy and blocked flexibility, reliability and the practicality that function is used.

The above is only preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.

Claims (4)

1. one kind has the video monitoring apparatus that privacy is blocked function, it is characterized in that, comprising:

Rig camera is used for gathering video image;

The The Cloud Terrace master chip is used for setting occlusion area information and electronics block;

The video image processing unit is used for according to described occlusion area information, at the opaque electronics block of the relevant position of described video image stack;

Monitor is used for the video image that output is superimposed with the electronics block.

2. as claimed in claim 1 have a video monitoring apparatus that privacy is blocked function, it is characterized in that, described The Cloud Terrace master chip is circumscribed with for the input unit of setting occlusion area information and electronics block.

3. the privacy occlusion method of a video image, is characterized in that, comprises the steps:

(1) the focal length parameter, occlusion area that records current monitoring camera lens in the video image coordinate system coordinate figure and monitoring camera lens towards level angle value and luffing angle value;

(2) according to the coordinate figure of occlusion area, the stack corresponding electronics block of shape and carry out video output in current video image;

(3) every the scheduled time, obtain the focal length parameter of a monitoring camera lens and monitoring camera lens towards level angle value and luffing angle value;

(4) data that obtain according to step (3) recomputate the coordinate figure of occlusion area in the current video image coordinate system, and the corresponding electronics block of the shape that superposes in current video image according to this coordinate figure also carries out video output.

4. the privacy occlusion method of video image as claimed in claim 3, it is characterized in that, described occlusion area and electronics block are rectangle, and the coordinate figure of described occlusion area in the current video image coordinate system is the coordinate figure on occlusion area four summits in the current video image coordinate system.

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