JP5218484B2 - Video signal processing method - Google Patents

Description

The present invention relates to a video signal processing method , and more particularly, to a video signal processing method for protecting privacy by processing a video of an image transmission / reception system such as a surveillance system, a videophone, or a nurse call.

  In recent years, due to advances in semiconductor technology, the cost of imaging elements such as CCDs and signal processing LSIs that constitute imaging devices has been reduced, and many monitoring systems and image communication devices using the imaging devices have been used. It has become like this. When these devices are in use, the following problems arise when there is no function for limiting the shooting range. For example, in a road monitoring system, not only the situation on the road (traffic volume, traffic flow, construction situation, broken car, accident car, etc.) is monitored, but the lens is pointed at a place other than the target, for example, a private house or a condominium, and a window It becomes possible to look into the information, etc., and problems such as privacy infringement occur. Even in a video conference system, if the receiving side is equipped with a function for controlling the direction of the imaging device on the transmitting side and the zoom magnification, it is possible to photograph a place other than the speaker on the receiving side, It becomes a problem when there is a range that you do not want to show. The same applies when the imaging device is linked in the nurse call system.

  The conventional techniques deal with these problems as follows. For example, as shown in FIG. 19, in the apparatus disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 5-75995), the panning angle and tilting angle of the electric swivel head are limited, and the lens of the imaging apparatus Does not face the privacy protection range, so that the privacy protection range cannot be photographed.

In addition, in the apparatus disclosed in Patent Document 2 (Japanese Patent No. 2778320), the zoom magnification is limited within a range of a preset panning angle and tilting angle so that the subject can appear small, or the focus can be reduced. The image is not easily discriminated by blurring.
^

  In addition, in the apparatus disclosed in Patent Document 3 (Japanese Patent Laid-Open No. 8-287383), the orientation of the imaging apparatus is set to a panning angle and a tilting angle that do not cause a privacy protection problem unless necessary. When necessary, a method of taking an image of the lens of the imaging device toward the subject at a specific panning angle and tilting angle stored in advance has been adopted.

Japanese Patent Laid-Open No. 5-75995 Japanese Patent No. 2778320 JP-A-8-287383

  However, in the conventional imaging apparatus and monitoring system as described above, when the panning angle and tilting angle are restricted by the electric swivel head, the turning stops within the restricted range. It is difficult to determine whether it has entered and stopped. When trying to point the imaging device at a certain point of interest (location where an accident occurred in the road monitoring system), if there is a limited range in the middle, there is a problem that it is difficult to use.

  Shooting is also possible when the zoom magnification is limited within the preset panning angle and tilting angle range so that the subject appears small or the focus is blurred so that the image cannot be easily identified. The zoomed and enlarged image could not be obtained near the boundary between the prohibited range (hereinafter also referred to as the privacy protection area) and the shootable range.

  Also, when necessary, the orientation of the imaging device is set to a panning angle and tilting angle that does not cause privacy protection, and when necessary, the subject is imaged with a specific panning angle and tilting angle stored in advance. In the method of shooting with the lens of the apparatus facing, there is a problem that it takes time until the direction of the imaging apparatus faces the subject.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to protect privacy without deteriorating the usability of an imaging apparatus and a monitoring system.

  In order to solve the above-described problems, in the present invention, the video signal processing apparatus includes a mask video signal generating unit that generates a mask video signal, a mask pulse generating unit that generates a mask pulse for setting a mask region, Video signal masking means for masking the privacy protection area of the input video in accordance with the mask pulse, and a configuration comprising mask pulse combination control means for controlling a combination of the position, size, shape and number of the mask area. .

  With this configuration, operability can be maintained without restricting pan / tilt operation of the electric swivel head, and privacy can be protected by masking only the privacy protection area without restricting the entire screen. .

  In addition, a mask position setting restricting means having a means for restricting the mask setting position from being changed by anyone other than the administrator is provided. With this configuration, it is difficult to change the privacy protection area on the screen once set, and the level of privacy protection can be increased.

  In addition, a communication means is provided for the administrator to centrally manage the mask setting position. With this configuration, privacy protection setting and management of a large number of installed video signal processing apparatuses can be performed efficiently and centrally.

  In the present invention, the video signal processing apparatus includes a mask video signal generating means for generating a mask video signal, a mask pulse generating means for generating a mask pulse for setting a mask area, and privacy of an input video in accordance with the mask pulse. Video signal masking means for masking the protection area, and a mask pulse combination control means for controlling the combination of the position, size, shape and number of the mask area. The operability can be maintained without restricting the tilt operation, and the privacy can be protected by masking only the privacy protection area without restricting the entire screen.

  In addition, since mask position setting management means having means for restricting the mask setting position from being changed by non-administrators is provided, it is difficult to change the privacy protection area on the screen once set, and privacy protection The effect that a level can be raised is acquired.

  In addition, since the administrator is provided with communication means for centrally managing the mask setting positions, the privacy setting and management of a large number of installed video signal processing apparatuses can be performed efficiently and centrally.

The functional block diagram of the video signal processing apparatus in the 1st Embodiment of this invention, A circuit diagram and a signal waveform diagram of a mask video signal generating means of the video signal processing device according to the first embodiment of the present invention, The block diagram and signal waveform diagram of the video signal switching means of the video signal processing device in the first embodiment of the present invention, The block diagram of the mask pulse position setting means of the video signal processing device in the first embodiment of the present invention, The block diagram and signal waveform diagram of the mask pulse generating means of the video signal processing device in the first embodiment of the present invention, Functional block diagram of another video signal processing apparatus in the first embodiment of the present invention, The functional block diagram of the another video signal processing apparatus in the 1st Embodiment of this invention, The functional block diagram of the video signal processing apparatus in the 2nd Embodiment of this invention, Explanatory drawing of operation | movement of the mask pulse combination control means of the video signal processing apparatus in the 2nd Embodiment of this invention, The functional block diagram of the mask pulse combination control means of the video signal processing apparatus in the second embodiment of the present invention, The functional block diagram of the video signal processing apparatus in the 3rd Embodiment of this invention, Explanatory drawing of the coordinate calculation in the case of zoom of the video signal processing apparatus in the 3rd Embodiment of this invention, Explanatory drawing of coordinate calculation at the time of pan / tilt of the video signal processing device in the third embodiment of the present invention, Explanatory drawing of the coordinate calculation when the zoom and pan / tilt of the video signal processing device in the third embodiment of the present invention are combined. The functional block diagram of the video signal processing apparatus in the 4th Embodiment of this invention, Explanatory drawing of the monitoring system by the remote operation of the video signal processing apparatus in the 4th Embodiment of this invention, The functional block diagram of the mask pulse position setting management means of the video signal processing apparatus in the 4th Embodiment of this invention, The functional block diagram of the communication means of the video signal processing apparatus in the 4th Embodiment of this invention, It is a schematic diagram explaining the structure of the conventional image monitoring system.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.

(First embodiment)
The first embodiment of the present invention generates a mask pulse corresponding to a set privacy protection area, and switches the input video signal and the mask video signal to protect the privacy of the input video. Device.

  FIG. 1 is a functional block diagram of a video signal processing apparatus according to the first embodiment of the present invention. In FIG. 1, a mask video signal generating means 1 is means for generating an analog luminance signal for masking. The video signal input terminal 2 is a terminal for inputting a video signal from the imaging apparatus. The video signal switching means 3 is means for switching between the mask video signal and the input video signal in accordance with the mask pulse. The video signal output terminal 4 is a terminal for outputting a video signal to a display device. The mask pulse position setting means 5 is a means for setting an area where privacy should be protected. The mask pulse generating means 6 is a means for generating a pulse corresponding to an area where privacy should be protected.

  FIG. 2 is a diagram showing the mask video signal generating means 1 and its signals. In FIG. 2, variable resistors 101 and 102 are circuits that output a predetermined DC voltage. The analog switch 103 is a changeover switch that operates with an external control signal.

  FIG. 3 is a diagram showing the video signal switching means 3 and its signals. The clamp circuits 303 and 304 are circuits for clamping the video signal. The analog switch 305 is a changeover switch that operates according to a control signal. The video amplifier 306 is an amplifier that amplifies the video signal.

  FIG. 4 is a block diagram of the mask pulse position setting means 5. The variable resistors 501, 502, 504, and 505 are variable resistors that are mechanically connected to a joystick. The position determination switch 503 is a switch for instructing position determination. The size determination switch 506 is a switch for instructing size determination. AD converters 507, 508, 509, and 510 (hereinafter referred to as ADC) are circuits that convert an analog position coordinate signal or the like into a digital signal. The latches 511, 512, 513, and 514 are level latch circuits that hold an input signal when the control terminal is at the H level and output the input signal as it is when the control terminal is at the L level. The selectors 529, 530, 531 and 532 are selection circuits for selecting an ADC-side signal or a serial / parallel converter signal. The serial / parallel converters 525, 526, 527, and 528 are circuits that convert serial data from the communication means 13 into parallel data.

  FIG. 5 is a diagram showing the mask pulse generating means and its signal. FIG. 6 is a functional block diagram of another video signal processing apparatus. It has a plurality of mask pulse position setting means and mask pulse generation means. FIG. 7 is a functional block diagram of still another video signal processing apparatus. A video signal addition / subtraction means 12 is provided instead of the video signal switching means.

  The operation of the video signal processing apparatus according to the first embodiment of the present invention configured as described above will be described with reference to FIG. The video signal output from the imaging device is supplied to the video signal input terminal 2, and the video signal at the video signal input terminal 2 is normally output to the video signal output terminal 4 by the video signal switching means 3. The mask pulse generating means 6 for generating a pulse corresponding to the region set by the mask pulse position setting means 5 to protect privacy and temporally in the scanning acts on the video signal switching means 3 to be used as a mask video signal. The video signal of the generating means 1 is selected and output to the video signal output terminal 4 to protect privacy.

  FIG. 2a is a block diagram of the mask video signal generating means. In this embodiment, a case where only a luminance signal is generated in an analog manner will be described. Reference numerals 101 and 102 are variable resistors to which a DC voltage is applied. Reference numeral 103 denotes an analog switch. The analog switch 103 selects the A side input when the external control terminal is at the H level. When a horizontal drive pulse (hereinafter referred to as HD) is applied to the control terminal of the analog switch 103, the output signal 104 of the analog switch 103 has a waveform as shown in FIG. Here, V101 is the output voltage of the variable resistor 101, and V102 is the output voltage of the variable resistor 102. Since the output signal 104 of the analog switch 103 is clamped by the video signal switching means 3 at the subsequent stage, V101 defines the black level and V102 defines the white level. If it is desired to use black as the mask video signal, V101 = V102 may be satisfied. In addition to the luminance signal, the mask video signal generating means generates a color signal using an encoder for a color television system, such as an NTSC encoder, so that the hue and saturation can be adjusted. Also good. In addition, the signal of the video signal input terminal 2 in FIG. 1 may be processed to perform mosaic processing, negative / positive inversion, painting by dropping bits, deformation by calculation, and various filter (LPF, HPF, etc.) processing.

  FIG. 3a is a block diagram of the video signal switching means. In the present embodiment, a case where the video signal of the mask video signal generating means 1 and the video signal input terminal 2 shown in FIG. 301 is connected to the output of the mask video signal generating means 1 of FIG. 302 is connected to the video signal input terminal 2 of FIG. Reference numeral 305 denotes an analog switch that selects an input on the A side when the control terminal 308 is at the H level. Reference numeral 306 denotes an amplifier for supplying a video signal to a television monitor or VTR connected to the subsequent stage by a video amplifier. As shown in FIG. 3b, a signal on the 302 side is normally selected as the video amplifier output 307, but when an H level signal is input to 308, a signal of 301 is selected only during that period.

  FIG. 4 is a block diagram of the mask pulse position setting means. In this embodiment, a case where the position of the mask pulse is set using a joystick used in a game machine will be described. 501, 502, 504, 505 are variable resistors mechanically connected to the joystick, 503 is a position determining switch, 506 is a size determining switch, 507, 508, 509, 510 are AD converters (hereinafter referred to as ADC), 511 512, 513, and 514 are so-called level latches that hold the input signal when the control terminal is at the H level and output the input signal as it is when the control terminal is at the L level. Usually, it is L level. Reference numerals 529, 530, 531 and 532 are selectors whose control terminals are pulled up, and usually select a signal on the ADC side. The selector control terminal is connected to the communication means connection information 524. Reference numerals 525, 526, 527, and 528 denote serial-parallel converters that take in serial data from the communication means 13 shown in FIG. This is used during remote operation. The position determination SW control terminal 521 and the size determination SW control terminal 522 are normally grounded at JP1 and JP2, respectively.

  In the present embodiment, for the sake of simplicity, the mask video signal is described as a rectangle having four parameters: the X and Y coordinates of the center position, the size in the X direction, and the size in the Y direction. .

  A DC voltage is applied to the variable resistor 501, and the joystick position information is converted into voltage information by the variable resistor 501, and further converted into digital information by the ADC 507. Accordingly, the center position X coordinate is output as a digital value to 516, similarly the center position Y coordinate is output to 515, the size in the X direction to 518, and the size in the Y direction to 517. If the center position is adjusted with the joystick and the position determination SW503 is fixed to the open side, the control terminals of the latches 511 and 512 are pulled up, so the values of 515 and 516 are held and fixed by the latches 511 and 512, respectively. Value. Similarly, if the size determination SW 506 is fixed to the open side by adjusting the sizes in the X and Y directions with a joystick, the values of 517 and 518 are held by the latches 513 and 514, respectively, and become fixed values.

  FIG. 5a is a block diagram of the mask pulse generating means. In 601, the X coordinate of the center position of the mask video signal is input. In 602, the size of the mask video signal in the X direction is input. In 603, the Y coordinate of the center position of the mask video signal is input. In 604, the size of the mask video signal in the Y direction is input. 601 is connected to 516 in FIG. 4, 602 is connected to 518 in FIG. 4, 603 is connected to 515 in FIG. 4, and 604 is connected to 517 in FIG.

  In order to mask a rectangular area on the screen as shown in FIG. 5b, an X-direction mask pulse Gx and a Y-direction mask pulse Gy may be generated and ANDed. The parameters actually given are the center position coordinates (x0, y0) and the rectangle sizes Lx, Ly as shown in FIG. 5d. From these, the following relational expression is used to obtain the rising edge x1, the falling edge x2, the rising edge y1 and the falling edge y2 of the mask pulse Gx. Since the origin of the screen coordinates is described as the upper left of the screen, the numerical values and coordinates to be handled are assumed to be zero or more unless otherwise specified.

x1 = x0−Lx / 2 (1)
x2 = x0 + Lx / 2 (2)
y1 = y0−Ly / 2 (3)
y2 = y0 + Ly / 2 (4)
When these equations correspond to the block diagram of FIG. 5a, equation (1) is 625 in FIG. 5a, equation (2) is 626, equation (3) is 627, equation (4) is 628, respectively. Correspond.

  Limiters 608, 609, 616, and 617 are the maximum values that can be taken when the calculation result becomes negative or the vertical counter (hereinafter referred to as V counter) counts HD (that is, the vertical scanning line of the screen defined by the television system). Number) or the horizontal counter (hereinafter referred to as H counter) CLK for defining the position in the horizontal direction exceeds the maximum number of H counters when using a clock four times the NTSC subcarrier frequency. It is inserted for the purpose of limiting the mask video signal from being generated during the blanking period.

  The H counter 623 is a 910-based counter that counts a frequency that is four times the subcarrier (that is, 910 times the horizontal scanning frequency), and resets in HD. The V counter is a 262.5 base counter that counts HD and resets with VD.

  The comparators 610, 611, 618, and 619 have outputs that are at the H level when the two inputs match. The output of the comparator 610 becomes H level for 1 CLK period when the output of the H counter 623 matches x1. The output of the comparator 611 becomes H level for 1 CLK period when the output of the H counter 623 matches x2. If these are respectively input to the J input and K input of the JK flip-flop 612, Gx rising at x1 and falling at x2 is obtained as shown in FIG. 5c. Similarly, in the JK flip-flop 620, Gy rising at y1 and falling at y2 is obtained. A desired mask pulse 622 is obtained by ANDing Gx and Gy by an AND gate 621.

  When this mask pulse 622 is applied to the analog switch control terminal 308 in FIG. 3, the video signal switching means 3 is used for masking for a period corresponding to the area on the screen set by the mask pulse position setting means 5 in FIG. Since the video signal of the video signal generating means 1 is selected and the signal of the video signal input terminal 2 is not selected, a video signal with privacy protected is obtained at the video signal output terminal 4.

  In FIG. 1, the case where there is one area where privacy should be protected has been described. However, in the case where there are a plurality of areas, as shown in FIG. 6, a plurality of pairs of mask pulse position setting means and mask pulse generation means are output. An OR operation may be performed and added to the video switching means 3.

  As shown in FIG. 7, the video signal adding / subtracting means 12 is used instead of the video signal switching means 3 of FIG. 1, and the signal of the video signal input terminal 2 is output during the period when the output of the mask pulse generating means 6 is at the H level. Even if the video signal of the mask video signal generating means 1 is added and subtracted and the video signal is output to the video signal output terminal 4, a video signal in which privacy is protected is obtained in the same manner.

  As described above, in the first embodiment of the present invention, the video signal processing device generates a mask pulse corresponding to a set area, switches the input video signal and the mask video signal, and inputs the mask signal. Since the video privacy is protected, pan / tilt operation is not restricted and the operability is good, and privacy can be protected by masking only the privacy protection area without restricting the entire screen.

(Second Embodiment)
The second embodiment of the present invention is a video signal processing apparatus that controls a combination of the position, size, shape, and number of areas in which privacy of an input video is to be protected.

  FIG. 8 is a block diagram of a video signal processing apparatus according to the second embodiment of the present invention. In FIG. 8, a mask pulse combination control means 7 is a means for outputting a control signal corresponding to a combination of a plurality of mask pulses. The mask video signal generating means 1, video signal input terminal 2, video signal switching means 3, video signal output terminal 4, mask pulse position setting means 5, and mask pulse generating means 6 are the same as in FIG. FIG. 9 is a diagram showing an image of the patient monitoring system. FIG. 10 is a block diagram showing the configuration of the mask pulse combination control means 7.

  The operation of the video signal processing apparatus according to the second embodiment of the present invention configured as described above will be described with reference to FIGS. This will be described assuming a patient monitoring system linked to a hospital nurse call. If there are three patients, patient 1, patient 2, and patient 3 in the same hospital room, and an image such as that shown in FIG. 9a is always obtained, privacy is infringed. Therefore, an image such as that shown in FIG. Is output. When the patient 1 presses the push button 1, the image of FIG. 9 b is displayed. When the patient 2 presses the push button 2, the image of FIG. 9 c is displayed. When the patient 3 presses the push button 3, the image of FIG. In order to obtain each of them, in the configuration of FIG. 8, a mask pulse combination control means 7 is added to the configuration of FIG.

  FIG. 10 shows the configuration of the mask pulse combination control means 7 as a block diagram. Reference numeral 71 denotes a push button 1 for the patient 1, 72 denotes a push button 2 for the patient 2, and 73 denotes a push button 3 for the patient 3. Reference numeral 701 denotes an address generation circuit for the RAM 702. (0,0) when the push button is not pressed, (0,1) when 71 is pressed, (1,0) when 72 is pressed, (1, 0) when 73 is pressed The address of 1) is output. Reference numeral 702 denotes a RAM, in which a flag indicating whether or not the output of each pair of mask position setting means and mask pulse generation means is output by AND gates 703, 704, and 705 is written in each bit of data. If 703 handles the privacy protection of the patient 1, 704 controls the privacy protection of the patient 2, and 705 controls the privacy protection of the patient 3, the AND gate 703 when the patient 1 presses the push button 71. Only on one side the input terminal becomes L level, the mask pulse is not transmitted, and an image as shown in FIG. 9B is obtained. Similarly, when the patient 2 presses the push button 2, the image of FIG. 9c is obtained, and when the patient 3 presses the push button 3, the image of FIG. 9d is obtained.

  In the present embodiment, the case where the number of inputs of the mask pulse combination control unit is three has been described. However, the present invention can be applied by expanding to n (n is a natural number) in general.

  As described above, in the second embodiment of the present invention, the video signal processing apparatus is configured to control the combination of the position, size, shape, and number of areas in which the privacy of the input video should be protected. You can protect the privacy of the required combination area when necessary.

(Third embodiment)
The third embodiment of the present invention is a video signal processing apparatus that applies a mask by calculating the position of a mask pulse in the screen according to the zoom magnification and the pan / tilt amount.

  FIG. 11 is a block diagram of a video signal processing apparatus according to the third embodiment of the present invention. In FIG. 11, the video signal processing apparatus includes a mask video signal generating unit 1, a video signal switching unit 3, a mask pulse position setting unit 5, and a mask pulse generating unit 6. Reference numeral 2 denotes a video signal input terminal, and 4 denotes a video signal output terminal. In the configuration of FIG. 11, zoom magnification detecting means 8 and mask pulse position / size normalizing means 11 are added to the configuration of FIG. FIG. 12 is a diagram for explaining the coordinates of a subject during zooming. FIG. 13 is a diagram illustrating the coordinates of the subject when panning and tilting are possible. FIG. 14 is a diagram illustrating a case where zoom and pan / tilt occur simultaneously.

  The operation of the video signal processing apparatus configured as described above will be described with reference to FIGS. The mask video signal generating means 1, video signal input terminal 2, video signal switching means 3, video signal output terminal 4, and mask pulse generating means 6 are the same as in FIG. The zoom magnification detection means 8 detects the position of the lens from the inside of the zoom lens to obtain the zoom magnification k, further converts it into a digital value, and inputs it to the mask pulse position / size normalization means 11. In the pan / tilt position detecting means 9, the rotation angle is converted into an electric signal by a variable resistor, further converted into a digital value, and similarly input to the mask pulse position / size normalizing means 11. The reason why the zoom magnification detecting means, the pan / tilt position detecting means, and the mask pulse position / size detecting means are provided will be described step by step.

  The coordinates of the subject during zooming will be described with reference to FIGS. For ease of explanation, the distance in the x and y directions from the origin to the subject center is referred to as the offset, with the origin of coordinates as the center of the image. Here, a case where a rectangular subject is photographed will be described.

The center coordinate of the subject at the zoom magnification k1 is C1 (x <k1>, y <k1>), the length in the x direction of the rectangle is Lx <k1>, and the length in the y direction is Ly <k1>. Similarly, the center coordinate of the subject at the zoom magnification k2 is C2 (x <k2>, y <k2>), the length of the rectangle in the x direction is Lx <k2>, and the length in the y direction is Ly <k2>. Then, the following relationship holds.
k2 / k1 = x <k2> / x <k1> (5)
= Y <k2> / y <k1> (6)
= Lx <k2> / Lx <k1> (7)
= Ly <k2> / Ly <k1> (8)

Therefore, when the zoom magnification is changed from k1 to k2, based on C1 (x <k1>, y <k1>), Lx <k1>, and Ly <k1> at k1, C2 (x <k2 >, Y <k2>), Lx <k2>, and Ly <k2> may be calculated as follows.
x <k2> = k2 · x <k1> / k1 (9)
y <k2> = k2 · y <k1> / k1 (10)
Lx <k2> = k2 · Lx <k1> / k1 (11)
Ly <k2> = k2 · Ly <k1> / k1 (12)

  These formulas are simply expressed in a block diagram as shown in FIG. 12b. In FIG. 12b, the relationship between x <k1> and x <k2> is shown, but the relationship between y <k1> and y <k2>, the relationship between Lx <k1> and Lx <k2>, and Ly <k1> The relationship of Ly <k2> can be expressed similarly. However, since FIG. 12b requires two latches, if x <k1> is divided by k1 and data is latched by normalization immediately, the number of latches is one and the circuit amount can be reduced. . Actually, k1 and k2 are information obtained by the zoom magnification detection means, and are latched and held at the time of k1, so they can be obtained from the same zoom magnification detection means just by moving around in time. The final circuit is as shown in FIG.

  With reference to FIGS. 13a to 13d, description will be given of the nature of the coordinates of the subject when the zoom magnification is 1 and the imaging apparatus is installed on the electric swivel head and panning and tilting are possible. The pan position θp and the tilt position θt are three-dimensional angles as shown in FIG. 13a. Hereinafter, all the coordinates on the screen are considered as solid angles. The center of the screen 1 in FIG. 13b is (θp, θt). The center of the rectangle located at a distance (x, y) from the center of the screen 1 is (θp + x, θt + y). It can be considered that the center of the screen 2 has a rectangular center and the center of the screen 2 is (θp + x, θt + y). If the position of the rectangle is managed in this state, two pieces of four pieces of data are sufficient as compared with the case where the center position of the screen 1 plus the offset is considered, so that the circuit is reduced.

Next, let us consider a case where the angle of view moves and the screen 3 is displayed as shown in FIG. 13d, and the center position of the screen is (θp ′, θt ′). If the offset at this time is (x ′, y ′), θp + x = θp ′ + x ′
X ′ = (θp + x) −θp ′ (13)
θt + y = θt ′ + y ′
And
y ′ = (θt + y) −θt ′ (14)
It becomes. This can be expressed as a circuit as shown in FIG. 13c. At this time, the sizes Lx and Ly of the rectangle are not changed because they are not zoomed, and are the same value.

  Next, a case where zoom and pan / tilt occur simultaneously will be described with reference to FIGS. 14a to 14d. In this case, as shown in FIG. 14a, zooming occurs on a screen whose solid angle at the center of the screen is (θp, θt). First, the size of the rectangle will be described. Since there was no effect on the size at the time of pan / tilt, if zoom and pan / tilt occur simultaneously, only equations (11) and (12) should be considered. Therefore, if expressed in terms of a circuit, it can be expressed by the lower two in FIG.

Next, the center position of the rectangle will be described. In FIG. 14B, a rectangle A having an offset (x, y) from the center (θp, θt) of the screen 1 at zoom k1 is considered. Since the zoom magnification k1 is multiplied by the offset, the center of the rectangle B at the normalized position has an offset (x ′, y ′) viewed from the screen center (θp ′, θt ′) after the view angle is moved. If it ’s a position,
θp + x / k1 = θp ′ + x ′
X ′ = (θp + x / k1) −θp ′ (15)
And similarly,
θt + y / k1 = θt ′ + y ′
Y ′ = (θt + y / k1) −θt ′ (16)
It becomes. Since the rectangle B is normalized, the offset (x ″, y ″) of the actual rectangle C is obtained by multiplying the offset by the actual zoom magnification k2 after moving the angle of view. Therefore,
x ″ = k2 · x ′ (17)
y ″ = k2 · x ′ (18)
It becomes. If the expressions (15) and (17), and the expressions (16) and (18) are combined and expressed in a circuit form, they become the upper half of FIG. 14c. This is a circuit format in which the number of latches is reduced, as in the case of FIGS. 12b to 12d. If it is expressed including connections with other blocks, it is as shown in FIG. 14d.

  The above describes the nature of the subject when zoom and pan / tilt occur simultaneously.However, the privacy protection area must change its position and size following the subject's zoom and pan / tilt. The property of coordinates can be applied as it is. Therefore, if the mask pulse position / size normalizing means 11 having the configuration shown in FIG. 14c is inserted between the mask pulse position setting means 5 and the mask pulse generating means 6 in FIG. It will follow and pan / tilt.

  As described above, in the third embodiment of the present invention, the video signal processing apparatus is configured to apply the mask by calculating the position of the mask pulse in the screen according to the zoom magnification and the pan / tilt amount. Therefore, when setting the mask pulse position, the mask pulse position can be easily set without worrying about the offset value of the mask pulse position.

(Fourth embodiment)
In the fourth embodiment of the present invention, the mask setting position is restricted so that only the administrator can change it, the administrator centrally manages the mask setting position, sets the level of authority of the administrator, and manages the lowest level. The person who can change only the setting of his / her own video signal processing apparatus is the video signal processing apparatus whose upper manager can change the setting of a plurality of video signal processing apparatuses.

  FIG. 15 is a block diagram of a video signal processing apparatus according to the fourth embodiment of the present invention. FIG. 16 is a diagram showing a monitoring system including three districts A, B, and C and a central monitoring room. In the present embodiment, description will be made assuming a monitoring system including three areas A, B, and C and a central monitoring room as shown in FIG. 15 and 16, the video signal processing apparatus includes a mask video signal generation unit 1, a video signal switching unit 3, a mask pulse position setting unit 5, a mask pulse generation unit 6, a mask pulse position setting management unit 10, and a communication unit 13. It is composed of Reference numeral 2 denotes a video signal input terminal, and 4 denotes a video signal output terminal. 1, 2, 3, 4, and 6 are collectively described as the video signal processing apparatus main body 16. The mask pulse position setting means 5 and the mask pulse position setting management means 10 will be described collectively as a video signal processing device control unit. Reference numeral 14 denotes an imaging device, and 15 denotes a television monitor.

  In FIG. 16, the operator of the central monitoring room is an administrator and has the authority to set and change the privacy protection area, and knows the password of the mask pulse position setting management means 10 in each of the A district, B district, and C district. The operators in districts A, B, and C do not know the password. In the configuration of FIG. 15, mask pulse position setting management means 10 and communication means 13 are added to the configuration of FIG. The mask video signal generation means 1, video signal input terminal 2, video signal switching means 3, video signal output terminal 4, and mask pulse generation means 6 are the same as in FIG. FIG. 17 is a block diagram showing the configuration of the mask pulse position setting management means 10. FIG. 18 is a block diagram showing the configuration of the communication means 13.

  The operation of the video signal processing apparatus configured as described above will be described with reference to FIGS. In the fourth embodiment, the mask pulse position setting means 5 of FIG. 4 is connected to the mask pulse position setting management means of FIG. 17 with the JP1 and JP2 of FIG. 4 removed. The relay contacts 1008 and 522 are connected to the relay contact 1009, respectively.

  FIG. 17 shows the configuration of the mask pulse position setting management means 10 as a block diagram. It is assumed that the control terminal 1007 of the normal selector 1003 selects the data on the password input means 1001 side at the L level.

  First, the operation at the time of device introduction and the rewriting of the password will be described. The personal identification number is written and stored in the personal identification number storage means 1002 from the personal identification number input means 1001. Next, a case where the mask pulse position setting unit is operated will be described. The personal identification number input from the personal identification number input means 1001 is collated with the personal identification number previously stored in the personal identification number storage means 1002 by the personal identification number collating means 1004.

  If the passwords match, the relay contacts 1008 and 1009 of the relay circuit 1005 are closed and 521 and 522 are grounded. 521 is connected to the position determination SW 503 for controlling the latches 511 and 512 in FIG. 4, and the position determination SW 503 can be grounded with the relay contact closed instead of JP1. At that time, the control terminals of the latches 511 and 512 become L level, and the changes of the variable resistors 501 and 502 are output to 515 and 516 so that the position adjustment is possible. If the position determination SW is restored, the control terminals of the latches 511 and 512 become H level, and new position coordinates are written. Similarly, 522 is grounded in a state where the code numbers match, and the operation of the size determination SW 506 in FIG. 4 is made valid. If the PINs do not match, the relay contacts 1008 and 1009 are not closed, and the control terminals of the latches 511, 512, 513, and 514 in FIG. 4 remain pulled up and the previous data is held to set the mask pulse position. Information in the privacy protection area of the means cannot be rewritten.

  Next, the operation during remote control will be described. FIG. 18 shows the configuration of the communication means 13 as a block diagram. In this embodiment, a case where a modem is used as the communication means will be described. 1301 is a telephone line, 1303 is transmission data, 1304 is reception data, 1305 is communication means connection information output, and becomes H level when communication is established. As shown in FIG. 15, the reception data 1304 of the communication means 13, the communication means connection terminal 1006 of the mask pulse position management means 10, and the communication means connection terminal 523 of the mask pulse position setting means 5 are connected. Is received by the mask pulse position management means 10 and the mask pulse position setting means 5. Further, a communication means connection information output 1305 of the communication means 13, a communication means information input terminal 1007 of the mask pulse position management means 10, and a communication means connection information input 524 of the mask pulse position setting means 5 are connected. A communication means connection information output 1305 that becomes H level when communication is established between them is input to the mask pulse position management means 10 and the mask pulse position setting means 5. Therefore, in the state where 1305 is at the H level, in FIG. 17, the selector 1003 connects the data of 1006 to the personal identification number collating means 1004 so that the personal identification number can be input by remote operation. Also, in FIG. 4, the selectors 529, 530, 531 and 532 select the data of the serial / parallel conversions 525, 526, 527 and 528 in the same way. become able to.

  As described above, in FIG. 16, an operator who does not know the PIN numbers of the A, B, and C districts cannot perform 17 operations and cannot rewrite the privacy protection area. In addition, the administrator who knows the security code of the central monitoring room can set and change each privacy protection area by inputting the security code of A, B, and C area remotely from the central monitoring room. is there. In the present embodiment, three locations have been described as examples. However, the present embodiment can be applied by expanding to n locations (n is a natural number).

  As described above, in the fourth embodiment of the present invention, the video signal processing apparatus is restricted so that only the administrator can change the mask setting position, and the administrator centrally manages and manages the mask setting position. The level of the authority of the administrator is set so that the lowest level administrator can change only the settings of his / her video signal processing device, and the higher level administrator can change the settings of multiple video signal processing devices. The level of protection can be increased, and the setting and management of privacy protection for many installed video signal processing apparatuses can be performed efficiently and centrally.

DESCRIPTION OF SYMBOLS 1 Mask video signal generation means 2 Video signal input terminal 3 Video signal switching means 4 Video signal output terminal 5 Mask pulse position setting means 6 Mask pulse generation means 7 Mask pulse combination control means 8 Zoom magnification detection means 9 Pan / tilt position detection means
10 Mask pulse position setting management means
11 Mask position / size normalization means
12 Video signal addition / subtraction means
13 Communication means
14 Imaging device
15 TV monitor
16 Video signal processor
17 Video signal processor control unit
20 Pan / tilt control unit (remote control device)
21 Control unit
22 Electric swivel head
23 Zoom lens
71 Push button 1
72 Push button 2
73 Push button 3
101 Variable resistor
102 Variable resistor
103 Analog switch
104 Analog switch output
301 Clamp circuit input (mask signal generator)
302 Clamp circuit input (Video signal input terminal side)
303 Clamp circuit
304 Clamp circuit
305 Analog switch
306 video amplifier
307 video amplifier output
308 Analog switch control terminal
501 Variable resistor
502 Variable resistor
503 Position determination switch
504 variable resistor
505 variable resistor
506 Size switch
507 AD converter
508 AD Converter
509 AD Converter
510 AD Converter
511 latch
512 latch
513 Latch
514 Latch
515 Center position Y coordinate
516 Center position X coordinate
517 Y size
518 Size in X direction
519 Positioning information
520 Sizing information
521 Position determination SW control terminal
522 Size determining SW control terminal
523 Communication connection terminal
524 Communication means connection information input
525 serial parallel conversion
526 serial parallel conversion
527 Serial to parallel conversion
528 serial parallel conversion
529 selector
530 selector
531 selector
532 selector
601 Center position X coordinate
602 Size in X direction
603 Center position Y coordinate
604 Y size
605 1/2 calculator
606 subtractor
607 adder
608 limiter
609 limiter
610 comparator
611 comparator
612 JK flip-flop
613 1/2 calculator
614 subtractor
615 Adder
616 limiter
617 Limiter
618 comparator
619 Comparator
620 JK flip-flop
621 AND gate
622 Mask pulse generator output
623 H counter
624 V counter
625 subtractor output
626 Adder output
627 Subtractor output
628 Adder output
701 RAM address generation circuit
702 RAM
703 AND gate
704 AND gate
705 AND gate
706 OR gate
1001 PIN code input method
1002 PIN code storage means
1003 selector
1004 PIN verification method
1005 Relay circuit
1006 Communication connection terminal
1007 Communication method connection information input
1008 Relay contact
1009 Relay contact
1101 Center position Y coordinate
1102 Center position X coordinate
1103 Y size
1104 Size in X direction
1105 Divider
1106 Divider
1107 Divider
1108 Divider
1109 Latch
1110 Latch
1111 Latch
1112 Latch
1113 multiplier
1114 multiplier
1115 multiplier
1116 multiplier
1117 Relative center position Y coordinate
1118 Relative center position X coordinate
1119 Relative Y direction size
1120 Relative X direction size
1121 Subtractor
1122 Subtractor
1123 subtractor
1124 Subtractor
1125 Zoom magnification
1126 Pan position
1127 Tilt position
1301 Telephone line
1302 modem
1303 Transmission data
1304 Received data
1305 Communication connection information output

Claims (2)

A video signal processing method for protecting privacy by processing input video,
Generating a mask video signal for masking the input video;
Generating a plurality of mask pulses for setting a mask region for masking the input video using the mask video signal ;
Wherein by combining a plurality of mask pulse to control the position and size and shape and number of the mask region for masking the input image, image signal processing method for setting the privacy protection area. The video signal processing method according to claim 1, wherein the change of the setting position of the mask area is restricted so that only an administrator can perform the change.

Images