JP3162898B2 - Multi-screen display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-screen display device having a function of synthesizing a plurality of images input from a plurality of surveillance cameras and dividing and displaying the images on the same screen.

2. Description of the Related Art Generally, a multi-segment screen adapter is a PIP
(Pictur in Pictur) This is an apparatus for executing a system (a display system having a function of displaying a plurality of types of images on the same screen), and is provided at a plurality of locations (usually two or four locations). In some cases, the input video from the monitoring cameras individually installed at 16 locations is reduced and combined into one video, and this video is divided and displayed on the same screen, so that a plurality of monitoring videos can be combined into one location. It can be observed all together. If one wants to pay attention to one video, it is possible to switch to the original video signal before reduction and display it on the entire screen .

[0002]

However, according to the above-mentioned method of enlarging an image to be watched and displaying it on the entire display screen, it is possible to sufficiently observe one image to be watched, but to view the image at another position. Cannot be observed at the same time. For this reason, if an abnormality occurs in another monitoring location while observing an image of one location to be watched closely, there is a problem that the discovery thereof is delayed. In addition, the potential disadvantage of reduced images, in which details are difficult to see, remains unsolved. Accordingly, a first object of the present invention is to provide a modern multi-segment screen display device capable of enlarging and displaying an image of an arbitrary surveillance camera while displaying images captured by a plurality of surveillance cameras on one display screen. . A second object of the present invention is to provide a high practical value multi-segment screen display device which can perform display switching such as disparate enlargement, equal-size display, PAN / TILT, step shift, etc. for each divided screen of a display screen. is there.

[0003]

In order to achieve the above object, according to the present invention, there is provided a display having a display screen for displaying a plurality of images in different areas, and a display screen having the same number of divisions as the display screen. A video processing unit that outputs the input video to the display at a timing at which the video is displayed in a predetermined divided area of the display screen, an input video dividing unit that distributes a plurality of input videos to a predetermined processing unit, and a video processing unit. A multi-segment screen display device comprising: a display control unit for controlling and displaying a video image in a desired divided area in a zoom-up manner, wherein the video processing unit includes an image memory, and a writing unit for writing an input video image to the image memory; Reading means for reading out the video written in the memory at the timing of displaying the video in the allocated area in the display screen. The display control means controls the writing speed of the writing means to the memory and / or the reading speed of the reading means from the memory in the processing unit to be zoomed up, and displays the image in an assigned area on the display screen. A cutout frame selecting means for selecting a size of a cutout frame for cutting out an image for scanning from a scanning field, and dividing the scanning field of the input image into a plurality of fields,
It is characterized by comprising a cutout frame changing means for changing the cutout frame over time from one divided field to another divided field.

In order to achieve the above object, a second aspect of the present invention has a processing unit corresponding to the number of divisions of a display screen, and each unit processes a different input image in an assigned area on the display screen. A multi-segment screen display device, comprising means for generating a pixel clock based on an input video signal, wherein the unit includes an image memory and an input image to be displayed in an assigned area on the display screen. Display magnification selection means for selecting the size of the cutout frame, writing means for writing the image memory with a pixel density corresponding to the video signal in the selected cutout frame, and a video signal written in the image memory on a display screen. Reading means for reading at a timing displayed in an allocated area in the image signal, wherein the writing means scans a video signal at each instant. Coordinate detecting means for detecting coordinates in the field, determining means for determining whether the detected coordinates are within the range of the cutout frame, clock frequency changing means for changing the frequency of the sampling clock according to the display magnification, and sampling. Sampling means for sampling a video signal at a clock cycle, horizontal addressing means for specifying a horizontal writing address, vertical addressing means for specifying a vertical address, and the judging means are within the range of the cutout frame At each instant when it is determined that the video signal sampled by the sampling means, the horizontal address, write control means to write to the memory area specified by the vertical address specifying means,
The clock frequency changing means is capable of changing the display magnification to at least two types, ie, an enlarged display and an equal-sized display, and includes at least one frequency divider and a changeover switch. It is characterized in that the sampling clock is selected as the sampling clock, and in the case of the equal-size display, the changeover switch selects the clock obtained by dividing the pixel clock by the frequency divider as the sampling clock.

[0005]

[0006]

[0007]

[0008]

The horizontal addressing means is a first counter for counting a sampling clock, the vertical addressing means is a second counter for counting a horizontal synchronization signal included in a video signal, and the first counter is The second counter is reset when the horizontal component of the coordinate detected by the coordinate detecting means coincides with the right end coordinate of the display frame in the horizontal scanning direction, and the second counter indicates that the vertical component of the coordinate detected by the coordinate detecting means coincides with the upper end coordinate of the display frame. Reset when it is performed.

An X coordinate counter for counting the pixel clock until the coordinate detection means is reset by a horizontal synchronization signal included in the video signal, and an X coordinate counter until the coordinate detection means is reset by a vertical synchronization signal included in the video signal. And a Y coordinate counter for counting the horizontal synchronizing signal.

The display magnification selecting means determines the size of the cutout frame by the coordinate value of the upper left corner and the coordinate value of the lower right corner of the cutout frame in the screen formed by the count values of the X coordinate counter and the Y coordinate counter. And an output circuit for outputting. The determination means includes the X coordinate counter, Y
The comparator is a comparator for comparing the count value of the coordinate counter with the coordinate value output from the output circuit.

The output circuit includes an X-direction start register for storing the X-direction start coordinate and the Y-direction start coordinate as the coordinate value of the upper left corner of the cutout frame, a Y-direction start register, and an X-direction coordinate for the lower right corner. An X-direction end register and a Y-direction end register for storing end coordinates and Y-direction end coordinates are included.

[0013] The multi-segment screen display device further includes a cut-out frame X-direction moving means for rewriting the stored coordinate values with the same difference between the coordinate values stored in the X-direction start register and the X-direction end register. And The cutting frame X-direction moving means includes a cutting frame positive direction movement control unit that rewrites the storage coordinates of the X-direction start register and the X-direction end register in an increasing direction at a constant speed, and in a direction in which the stored values of the two registers increase. A first comparing unit that compares the stored value of the X-direction end register with the right end coordinate of the scan field of the input video when the data has been rewritten; and X when the stored value of the X-direction end register matches the right end coordinate of the scan field. A cutout frame negative direction movement control unit that rewrites the storage coordinates of the direction start register and the X direction end register in a decreasing direction at a constant speed, and starts the X direction when the stored values of the two registers are rewritten in a decreasing direction. A second comparing unit for comparing the stored value of the register with the left end coordinate of the scan field of the input image, and storing the X direction start register There to match the left end coordinates of the scanning field, characterized in that starting the trimming frame forward movement control unit.

Further, the multi-segment screen display device further comprises
The difference between the coordinate values stored in the direction start register and the coordinate value stored in the Y direction end register is the same, and a cutout frame Y direction moving means for rewriting the stored coordinate values is included. The cutting frame Y direction moving means includes a cutting frame positive direction movement control unit that rewrites the storage coordinates of the Y direction start register and the Y direction end register at a constant speed in an increasing direction, and a direction in which the stored values of the two registers increase. Y if it has been rewritten
A first comparing unit for comparing the stored value of the direction end register with the right end coordinate of the scan field of the input video; and a Y direction start register and a Y direction end when the stored value of the Y direction end register matches the right end coordinate of the scan field. A cutout frame negative direction movement control unit for rewriting the storage coordinates of the registers in a decreasing direction at a constant speed, and a storage value of an Y direction start register and an input image when the stored values of the two registers are rewritten in a decreasing direction. And a second comparing unit that compares the left end coordinates of the scan field with the left end coordinates of the scan field.
Activating the cutout frame forward movement control unit.

In the multi-segment screen display device, the scanning field of the input image is divided into a plurality of fields, and the output circuit includes the Y-direction start register, the Y-direction start register, and the X-direction start register.
It is characterized by including a circuit for rewriting the coordinates stored in the direction end register and the Y direction end register into the start point coordinates and the end point coordinates of different divided field portions at regular time intervals.

In order to achieve the above object, the invention according to claim 13 is a method for processing a plurality of images input from a plurality of surveillance cameras by the same number of units as the number of surveillance cameras and displaying the divided images on the same display screen. A split screen display device, which is inserted between a surveillance camera and each processing unit, and a connection switching means for switching a connection state between the surveillance camera and the processing unit, and a display for changing a position for cutting out a display frame in a scanning field of the surveillance camera. A frame cutout position changing unit, wherein each of the processing units includes an image memory and a display magnification for selecting a size of a cutout frame in a scan screen of the surveillance camera to be displayed in an assigned area on the display screen. Selecting means, writing means for writing to the image memory at a pixel density according to the video signal in the selected clipping frame,
Reading means for reading out a video signal written in the image memory at a timing at which the video signal is displayed in an assigned area of a display screen, wherein the connection switching means supplies the video of one monitoring camera to a number of processing units. To change the display frame cutout position of each processing unit depending on whether
Features.

[0017]

The writing means includes a coordinate detecting means for detecting coordinates in a scanning field at each instant of the video signal;
Determining means for determining whether the detected coordinates are within the range of the cutout frame; clock frequency changing means for changing the frequency of the sampling clock in accordance with the display magnification; and sampling means for sampling a video signal at the cycle of the sampling clock. A horizontal address designating means for designating a write address in the horizontal direction, a vertical address designating means for designating a vertical direction address, and a sampling means at each moment when the judging means judges that it is within the range of the cutout frame. And writing control means for writing the sampled video signal into the memory area designated by the horizontal address and vertical address designating means.

[0019]

According to the first aspect of the present invention, the display screen is divided into the same number as the number of processing units, and different images are displayed in each divided area. Then, by the function of the display control means, the video projected on an arbitrary divided area can be displayed in a zoom-up manner.

In this case, the image to be zoomed up is displayed only within the frame of the divided area on the display screen, and therefore, other images are displayed simultaneously in the other divided areas. According to the second and thirteenth aspects of the present invention, the size of the cutout frame from the scanning field of the input image can be selected by the display magnification selecting means of each processing unit. , The input video can be zoomed up.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram showing an example of a circuit configuration of a multi-segment screen adapter according to the present invention. In this apparatus, video signals transmitted from four monitoring cameras (not shown) are input through camera input terminals 1 to 4. As to whether or not to input each video signal, the microcomputer 10 controls switching of switches SW1 to SW4 provided corresponding to the input terminals 1 to 4, respectively. Next, the input video signal is input to the PIP units 1 to 4 after the corresponding decoders 1 to 4 decode the color. In the PIP units 1 to 4, each video signal is converted into a reduced video signal. And PIP units 1 to
The reduced video signal output from the D / A converter 4
After passing through a PF 6 (a low-pass filter), a color encoder 7 and an on-screen 8 (a character inserter),
Output from the divided output terminal 9.

The microcomputer 10 includes the switches SW1 to S
In addition to W4, switching control of switches SW5 and SW6 is performed, and further, the PIP units 1 to 4, the key matrix 11 and the display matrix 12 are controlled. If the input positions of the switches SW1 to SW4 are set in order from the top, the input position indicates that each video signal input from the corresponding input terminal 1 to 4 is displayed as a reduced image on one of four divided screens. Case (QUAD
OUT) and the input position (HA in the figure)
LF) are a video signal input from the input terminal 1 and an input terminal 2 on the left and right sides of the screen divided into two in the vertical direction (although it can be divided into two in the horizontal direction).
The input position (indicated by HALF in the figure) is used when displaying the video signals input from the respective sections in a reduced video display (HALF OUT). The input position is used to display a video signal input from the terminal 3 and a video signal input from the input terminal 4 in a reduced video display, respectively. Is used when displaying images at the same size (QUARTER OUT) on a full screen (the whole of the four divided screens) via.

The switch SW5 selects one of the video signals input from the input terminals 1 to 4 according to an instruction from the microcomputer 10, and switches the switch SW1 through the ATT 13 (attenuator). 3 input positions (in the figure,
QUARTER) and the switch SW6. Also, switch SW
6 outputs one video signal output from the switch SW5 and one of four reduced video signals (outputted QUAD OUT) output from the on-screen 8 from the video output terminal 14 according to an instruction from the microcomputer 10. It is supposed to.

As shown in FIG. 2, the PIP units 1 to 4 generally include an image memory 21 and a writing circuit 22 for writing an image (hereinafter, referred to as an original screen or an original image) photographed by a surveillance camera into the memory 21. A reading circuit 23 for reading an image written in the memory 21 and a circuit 24 for converting information from the microcomputer 10 into a logic signal handled by the PIP unit.

The conversion circuit section 24 converts a display instruction for enlargement, equal-magnification, or reduction input from the key matrix 11 to the microcomputer and designation information as to which monitor camera image is to be written into a predetermined logic signal. Data conversion circuit 24
1 and an X-axis start point coordinate XSTART and an X-axis end point coordinate XSTO for specifying which area of the original image is to be written to the memory 21 based on the signal from the data conversion circuit 241.
P, Y axis start point coordinates YSTART, Y axis end point coordinates YSTO
Circuits 242 and 243 for outputting each signal of P, and a circuit 2 for switching the switches SW7 and SW9 on the writing circuit side and the reading circuit side to the enlarged display position when the enlarged display is designated.
44, and an output selection circuit 245 for switching the selectors 1 to 3 on the readout circuit side depending on which monitor camera image is displayed. The X-axis start point XSTAR
T, X axis end point coordinate XSTOP, Y axis start point coordinate YSTAR
The T and Y axis end point coordinates YSTOP indicate the range of the image cut out from the original screen. For example, the original screen is changed to F in FIG.
In the case of 0, in the case of the same size display, the shaded area F1 in the figure is the range of the image to be cut out. Therefore, in this case, XSTART and YSTART are the coordinates of the position of the upper left corner of the area F1, XSTOP, YSTOP means the coordinates of the position of the lower right corner of the area F1. Similarly, at the time of enlarged display, the shaded area F2 in the figure is the range of the image to be cut out, XSTART and YSTART are the coordinates of the upper left corner of the area, and XSTOP and YSTOP are the coordinates of the position of each lower right corner. In reduced display, the coordinates of the upper left corner of the original screen F0 are XSTART and YSTART, and the coordinates of the lower right corner are XSTOP and YSTOP. Incidentally, the same size display means a display when the writing speed to the memory 21 is equal to the reading speed, the enlarged display is a display when the writing speed is faster than the reading speed, and the reduced display is a reading speed. On the other hand, it means a display when the writing speed is low.

The writing circuit section 22 is a circuit for writing the video signal output from the surveillance camera or the luminance signal Y thereof (only the luminance signal is used in the illustrated example) into the memory 21, and the synchronization separation circuit 2201 , Horizontal and vertical counters 2204 and 2205, comparators 2206 and 22
07, horizontal and vertical address counters 2208 and 2209
And so on. The synchronization separation circuit 2201 separates and extracts the horizontal synchronization signal HD and the vertical synchronization signal VD included in the luminance signal Y of the monitoring camera. As is well known, one horizontal synchronizing signal is generated per one scanning line, and therefore, in one field, more than 200 dozens are generated. On the other hand, one vertical synchronization signal is generated per field.

The vertical counter 2205 outputs a horizontal synchronizing signal HD.
, And reset by the vertical synchronizing signal VD, so that the final value is the total number of horizontal synchronizing signals per field, and the count value at each instant indicates the scanning line number being scanned at that instant. The horizontal synchronizing signal HD is counted by a vertical counter 2205, and after being frequency-multiplied by a PLL frequency synthesizer 2202, is divided by a frequency divider 2203.
, The frequency is divided to the frequency that generates one clock during the time of scanning one pixel on the screen. The pixel clock is counted by the horizontal counter 2204. Since the horizontal counter 2204 is reset by the horizontal synchronizing signal HD, the horizontal counter 2204 indicates the total number of pixels in one scan line immediately before the reset, and the count value at each instant is the value on the horizontal scan line of the monitoring camera at that instant. Indicates the scanning position.

The instantaneous count value of the horizontal counter 2204 is compared by a comparator 2206 with the start point XSTART and the end point coordinate XSTOP output from the start point and the end point output circuit 242 of the X axis (referred to as the horizontal scanning line coordinate axis). You. FIG. 4 is a circuit showing the comparator 2206 in detail. The XSTAR output from the start point / end point output circuit 242 is shown in FIG.
Registers R1 and R2 for storing the values of T and XSTOP,
Each binary output of the horizontal counter 2204 is compared with each binary output of the registers R1 and R2.
AND elements A10 to A18, A20 for generating level outputs
To A28, an AND element XS that outputs an H level output when the count value of the horizontal counter 2204 matches the value XSTART stored in the register R1, and the horizontal counter 2
204 and the value XST stored in the register R2
AND element X that outputs an H-level output that matches OP
E and the logical sum of the two AND elements XS and XE are input to the clock terminal cl, and the H output of the AND element XE is applied to the reset terminal, as shown in FIG. 5, from the coordinates XSTART to XSTOP. , H level W
And a D flip-flop DF that emits an E signal. D
The output of the flip-flop DF is applied to the AND circuit 2210 as one input.

The output of the AND element XS is applied as a reset signal to a horizontal address counter 2208 in FIG. The horizontal address counter 2208 counts a pixel clock output from the switch SW7 or a frequency-divided output thereof, and starts counting from a point in time when the reset signal is reset to coincide with the coordinate XSTART. The count value of the counter 2208 specifies the horizontal address of the memory.

Although not shown, the comparator 2207 has the same circuit configuration as the comparator 2206 described above. Therefore, an H-level output is given to the AND circuit AND1 until the scanning line reaches the coordinates YSTART to TSTOP.
A reset signal is supplied to the vertical address counter 2209 when the scanning line coincides with the coordinate YSTART. After the reset, the vertical address counter 2209 counts the horizontal synchronization signals HD one by one, and specifies a vertical address in the memory 21 by the count value at each time.

SW7 is a switch for selecting the sampling clock of the AD converter 2214 and the clock of the horizontal address counter 2208. The terminals t1 and t0 are connected at the time of enlarged display, and the terminals t2 to t0 are displayed at the time of equal magnification display.
However, the terminals t3 to t0 are connected at the time of reduced display.
When the terminals t1 -t0 are connected, the output clock coincides with the pixel clock. Therefore, the AD converter 2214 digitizes and outputs the luminance signal Y for each pixel, and the horizontal address counter 2208 outputs the address every one pixel clock. 1
Increase. When the terminals t2 -t0 are connected, a clock obtained by dividing the pixel clock by the frequency divider 2211 becomes an output clock. Therefore, the AD converter 2214 digitizes the luminance signal Y by skipping one pixel and outputs the result. The horizontal address counter 2208 increases the address by one each time the AD converter 2214 outputs a digital signal. When the terminals t3 to t0 are connected, the frequency divider 221
The clock divided by 1 is further divided by the divider 2212 to output one clock every four pixel clocks. Therefore, the AD converter 2214 performs digitization at a rate of one pixel for every four pixels of the surveillance camera. The horizontal address counter 2208 increases the address by one each time a digital signal is output from the AD converter 2214.

The switch SW8 is a switch for switching the frequency of the horizontal synchronizing signal HD by the frequency divider 2213 and adding it to the AND circuit 2210 only when the image is reduced and displayed. Therefore, in the display other than the reduced display, the connection of the switch SW7 is in the illustrated state, and the two horizontal synchronization signals H
In each period between D and HD, the gate of the AND circuit 2210 is opened. In the case of reduced display, the gate is opened once every two periods.

Next, the operation for writing the luminance signal Y into the memory 21 will be described. For convenience of explanation, it is assumed that the operator has selected the same size display. When the luminance signal Y is input from the surveillance camera, the digital signal is converted by the AD converter 2214 for every two pixels into one pixel and sent out to the memory 21. Now, assuming that the scanning position of the monitor television is between the starting point at the upper left of the original screen F0 and the coordinates XSTART and YSTART, the comparators 2206 and 2207
Is output at the L level, the AND circuit 2
No WRITE ENABLE signal has been issued from 210. Therefore, the luminance signal Y at the scanning position is A
The data is converted into a digital value by the D converter 2214, but is not written into the memory 21.

On the other hand, the scanning position of the surveillance camera corresponds to the coordinate XST.
When it reaches ART and YSTART, the comparator 220
6 and 2207 are both at the H level, so that the WRITE ENABLE signal is output from the AND circuit 2210 to the memory 2
Given to one. At this time, the horizontal address counter 22
08 and the vertical address counter 2209 are both reset, so that the luminance signal Y at the XSTART and YSTART positions is stored at the head address of the memory 21. Thereafter, when the scanning position moves rightward on the scanning line, the horizontal address counter 2208 counts up the clock one by one every two pixels, and the digital signals output from the AD converter 2214 are successively shifted to the next address. To be stored. Each time the scanning position of the surveillance camera reaches the right end, it moves on the lower scanning line, and the count value of the vertical address counter 2209 increases each time. This allows the counter 22
The instantaneous luminance signal is stored in the address designated by the address 09.

Thereafter, the scanning position of the surveillance camera is changed to the coordinate XST.
Until OP and YSTOP are reached, the luminance signal Y in the area F1 is changed to two address counters 2208 and 2209.
Is stored at the address specified by. Then, when the scanning position exceeds the coordinates XSTOP and YSTOP, the WRITE ENABLE signal is no longer emitted from the AND circuit 2210, and the writing of the luminance signal Y into the memory 21 ends. Thus, the images of the F1 area in the entire screen F0 of the surveillance camera have been written in the memory 21 in the order of addresses.

The above is the writing operation when the operator selects the same size display, but the basic operation is the same for the enlarged display and the reduced display. However, in the case of the enlarged display, the WRITE ENABLE from the AND circuit 2210 is performed only when the F2 area in the original screen F0 is scanned.
Is generated, only the image in the area F2 is stored in the memory 21. Moreover, in this case, the sampling clock of the AD converter 2214 is the same as the pixel clock, and the horizontal address counter 2208 increases the address every pixel clock, so that all the pixels in the F2 area on the original screen F0 are deleted. Will be remembered. In the case of the reduced display, the image of the entire original screen F0 is stored in the memory 21. In this case, the AD change unit 2214 outputs the original image F0.
Digitizing only one pixel for every four pixels of 1
Since the horizontal address counter 2208 also only counts up once for every four pixels, the original screen F0 is stored in the memory 21.
Are stored one by one for every four pixels.

Next, the read circuit portion 23 is provided with a selector 230.
1-2305, horizontal counter 2309, vertical counter 2
310 and the like. Selectors 2301-23
03 is the clock CLK01-04 of all surveillance cameras,
Horizontal synchronization signals H01-04, vertical synchronization signals V01-04
Is input, and the clock signal CLK01 and the horizontal synchronization signal H of the surveillance camera which send out the luminance signal Y to the writing circuit portion 22 in accordance with an instruction from the output selection circuit 245.
01, the vertical synchronization signal V01 is selected. Selector 230
Reference numerals 4 and 2305 are used to input coordinates indicating from which position on the screen frame of the display device the video stored in the memory 21 is to be displayed, and a horizontal position or a vertical position can be selected by designation input. . G in FIG. 3C indicates a screen frame of the display device. The figure shows an example in which the display is divided into four parts. Screen 1 has display start positions of HS1FIX and VS1FIX, screen 2 has HS2FIX and VS1FIX, and screen 3 has H.
S1FIX, VS2FIX, screen 4 is HS2FIX, V
S2FIX. Here, HS means the horizontal direction, and VS means the vertical direction. In this embodiment, a description will be given assuming that the screen 1 is assigned to the PIP unit.

The clock CLK01 output from the selector 2301 is a pulse having a frequency higher than the scanning period of one pixel of the surveillance camera. Therefore, the clock CLK01 is obtained by connecting two frequency dividers in series.
The frequency is reduced to half the frequency of the pixel clock by the / 4 frequency divider 2306. The horizontal counter 2309 counts this clock. The horizontal counter 2309 and the corresponding counter 2204 on the write circuit 22 side perform the counting operation and the horizontal synchronization signal H.
It is the same to be reset at 01. However, this does not mean that it is simultaneous with the counter 2204 on the write circuit side, and the read circuit side 23 performs the read operation at its own timing. The remaining circuits on the read circuit side 23, that is, the vertical counter 2310, the comparators 2311 and 2312, the horizontal address counter 2313, and the vertical address counter 2
314 performs the same operation as the corresponding circuit on the write circuit side 22. Therefore, the details of the operation are omitted.

When the count values of the horizontal counter 2309 and the vertical counter 2310 become larger than the coordinates of the display start positions HS1FIX and VS1FIX, the comparators 2311 and 2312 output an H level output.
And the memory 21 is set to READ ENABLE
Give a signal. Then, the memory 21 reads the READ ENA
When in the BLE state, the horizontal address counter 231
3. The stored contents are read from the address given by the count value of the vertical address counter 2314. The read signal is converted into an analog luminance signal Y by a DA converter 2316 and output. When the operator selects the enlarged display, the switch SW9 divides the frequency of the horizontal synchronizing signal H01 by the frequency divider 2307, and
Switch to give to 10. As a result, the time for the vertical counter 2310 to increase by 1 is doubled, and during this time, the horizontal counter 2309 is reset twice. Therefore, one scan line in the memory 21 is repeatedly read twice, thereby displaying. The image can be enlarged in the vertical direction. Unlike the corresponding counter 2208 on the write circuit side, the horizontal address counter 2313 does not differ in the frequency of the clock counted for each of the display states of the enlarged display, the same size display, and the reduced display, and always outputs from the frequency divider 2306. The clock of half the frequency of the pixel clock to be counted is counted.

Since the PIP units 1 to 4 have the configuration shown in FIG. 2, if the input positions of the switches SW1 to SW4 are set to the positions, the images captured by the four surveillance cameras are changed as shown in FIG. The image can be divided into four parts on the display screen G, and at that time, in each of the divided screens 1 to 4, the image in the original screen F0 can be displayed in three modes of the same size, reduced size, and enlarged size.

When the input positions of the switches SW1 to SW4 are switched to the positions, the image of the monitoring camera 1 is input to the PIP units 1 and 3 through the switches SW1 and SW3, and the image of the monitoring camera 2 is input to the PIP unit 2 through the switches SW2 and SW4. , 4 are input. Therefore, the two PIP units 1 and 3, 2 and 4, as shown in FIG.
By properly setting RT, YSTART, XSTOP, and YSTOP, it is possible to display the images of the two surveillance cameras on the display screen G in two vertically divided screen halves. In this case, of course, it is also possible to switch to the respective modes of enlargement, equal magnification, and reduction.

When the input positions of the switches SW1 to SW4 are switched to, the video of the monitoring camera 3 is input to the PIP units 1 and 3 through the switches SW1 and SW3.
Since the image of the surveillance camera 4 is input to the PIP units 2 and 4 through the switches SW2 and SW4, the image of the surveillance camera 3 is displayed on the display screen G on two divided screens 1 and 3 and the remaining divided screen 2 4 shows the video of the surveillance camera 4. Of course, by changing the connection of each camera to the switches SW1 to SW4, the images of the two surveillance cameras are displayed on the display screen G on the upper and lower screen parts divided horizontally into two parts as shown in FIG. You can also. In this case, of course, the image can be displayed in each of the enlargement, equal magnification, and reduction modes.

When the input positions of the switches SW1 to SW4 are set, the video of one of the surveillance cameras is shared by each of the PIP units 1 to 4 and displayed on a four-split screen portion on the display screen G. In addition to the above display modes, a display such as PAN / TILT or step shift can be performed by the operation of the microcomputer 10. Hereinafter, the display of them will be described. PAN / TILT means that a cutout frame, for example, F1 (or F2) in the original screen F0 is moved at a constant speed in the horizontal direction or moved in the vertical direction as indicated by an arrow in FIG. A function that can be performed.

When PAN / TILT is performed, with respect to PAN (smooth screen movement in the horizontal direction), the horizontal writing start point XSTART is changed continuously in small steps at the same magnification or enlargement. For example, when the horizontal movement range [X1 to X2] is 256 dots, and the uniform writing interval is 1 dot / 1 field and the horizontal writing start point is added, the NTSC (TV in Japan and the United States) is used. Since 1 field = 1/60 second in the signal standard), it is possible to PAN an image so as to move 256 fields in about 4 seconds. When the image is panned to the right, the horizontal writing start point XSTART is increased, and when the image is panned to the left, the horizontal writing start point XSTART is decreased. And

Regarding TILT (smooth vertical screen movement), for example, a vertical writing start point YS
TART is set to 110 in the vertical movement range [Y1 to Y2].
H (Horizontal line) at even intervals
When writing and reading are performed in the write area of the memory 21 by shifting by H / 2 fields, the video is shifted from the top to the bottom so that the 220 fields are moved in about 4 seconds.
LT can be. When the image is tilted downward, the writing start point YSTART in the vertical direction is increased. On the other hand, when the image is tilted upward, the writing start point YSTART in the vertical direction is decreased. And

By the above-mentioned PAN / TILT function, the effective display area in the divided screen (usually, 9
0%) can be seen from corner to corner. In addition, the PAN / TILT function moves an image in each of the X direction and the Y direction of the screen. By mixing these functions, the image can be moved obliquely. For example, XSTART and YSTA
By simultaneously increasing RT, the image can be moved toward the lower right, and conversely, by simultaneously decreasing XSTART and YSTART, the image can be moved toward the upper left. Further, by arbitrarily setting XSTART and YSTART, it is possible to cope with any movement in the horizontal, vertical, and oblique directions. In addition, STEP SH
When performing IFT, since the amount of movement of X and Y is larger than in the case of PAN / TILT described above, the stay time at the writing position is set to be longer, and the writing start point is changed at predetermined time intervals. go.

FIG. 7 shows a flowchart for performing PAN / TILT. Initially, the display start positions XSTART and YSTART are set to 0 (S1). When the operator inputs desired movement times IP and IT (S2), these times IP and IT, the number of horizontal dots Dp and the number of vertical lines Lv on the original screen F0, and the number of fields per second (= 60) ) Is used to calculate how many dots are increased in the horizontal direction per field to satisfy IP, IT (INCP) and how many lines are increased in the vertical direction (INCT) (INCT). S
3). If the moving direction includes a horizontal direction (hereinafter, referred to as a PAN direction) (S4), the INCP value obtained in S3 is calculated as X
If the increment is stored in the register as the X-direction increment XINC and further includes the vertical direction (hereinafter referred to as the TILT direction) (S
6) Increment the INCT value in the Y register by YINC
(S8). PAN or TI at S2
If only one of the LTs is specified, S5 or S9
The increment XINC or YINC is stored only in the register in the direction specified in the step (1).

When a predetermined calculation is completed in each of the above steps, a timer which counts up every time one field is scanned is operated (S10), and the display start position XSTA is started.
RT, YSTART, display end position XSTOP, YST
OP is obtained by the operation expression in S11. Where,
XWIDTH and YWIDTH are the number of horizontal dots and the number of vertical lines of a quarter screen.

Display start position XST obtained in S11
ART and YSTART are values (XINC, YINC) stored in the X and Y registers from the values at the time of initialization (S1).
Is only increasing. Each coordinate value obtained in S11 is represented by S12
In steps S15 to S15, it is determined whether the image does not protrude from the original screen F0. If neither the display start position nor the display end position does not protrude from the original screen F0, and one field scanning time has elapsed (S16), the process proceeds to step S17. It is output from the microcomputer 10 to the PIP units 1-4.

Then, returning to S10, the timer is set. In S11, the values of XSTART and YSTART are incremented by XINC and YINC, and XSTOP and YSTOP are incremented.
The value of YSTOP is incremented by XWIDTH and YWIDTH. If these values do not protrude from the original screen (S12 to S15), after one field scanning time has elapsed (S16), they are output to the PIP units 1 to 4 (S1).
7). Thereafter, the processing of S10 to S17 is repeated every time one field is scanned, whereby the cutout frame moves at a constant speed in the PAN direction or the TILT direction on the original screen F0. If the right end of the cut-out frame slightly protrudes from the original screen F0 by this movement, for example, YES is determined in S12, and XINC is changed to a negative value in S18. As a result, the value of XINC is subtracted from the value of XSTART, and the cutout frame moves leftward in the original screen F0. When the left end of the cutout frame slightly protrudes from the left end of the original screen F0 by moving leftward, S
At 13, the determination is YES, and the value of XINC turns positive again. When the PAN is selected in this manner, the cutout frame repeatedly moves left and right in the original screen. Also in the TILT direction, the cutout frame is repeatedly moved up and down by the processing of S19, similarly to the PAN direction. And PAN / TI
The above operation continues until a selection other than LT is made.

Next, in the step shift, as shown in FIG. 8 (b), the original screen F0 is divided into four screens A to D, and the divided screens are switched one by one at fixed time intervals to store the memory of the PIP unit. 21. However, FIG. 8B shows an example of the case where the original image is displayed in the same size. In the case of the enlarged display, the original screen F0 is divided into 16 parts a to p as shown in FIG. The data is written into the memory 21 while being switched one by one. This step shift function includes the coordinates XSTART, YSTART, XS
This is realized by changing the values of TOP and YSTOP by the microcomputer 10 at predetermined time intervals so as to correspond to the respective divided screens shown in FIG. 8B or 8C. In addition, (f) of FIG.
(G) and (h) show a situation in which the display screen G is vertically divided into two and a step shift of the original screen is performed in the divided screen. Similarly, FIGS. 6B, 6C, and 6D show a situation where the display screen G is divided into two parts horizontally and the original screen is step-shifted in the divided screens.

In the above configuration, switching to the enlarged display can be performed based on an instruction from the operator.
For example, when a person or the like suddenly enters the detection field of view of the monitoring camera, the display may be automatically switched to the enlarged display. In this case, the presence or absence of intrusion of a person or the like in the detection visual field is determined by comparing the video frame from the surveillance camera with the current frame and the immediately preceding frame by determining whether or not there is a change of a certain value or more. Can be. This technique is disclosed in, for example, Japanese Patent Application Laid-Open No. 61-756.
No. 91, which is publicly known.

When a person or the like enters the detection field of view of the camera and the display is enlarged, it is preferable that the area to be enlarged is a portion where it is determined that a person or the like has entered if possible. The location where a person or the like has entered can be generally determined by dividing the input image into a plurality of parts and detecting a change between the current frame and the previous frame for each divided region.

[0054]

According to the multi-segment display device of the present invention,
It is possible to freely and easily display images from a plurality of surveillance cameras on a split screen, in a reduced size, in a same size, or in an enlarged size. In addition, by using the PAN / TILT function together, it becomes possible to closely observe the situation of the details that are difficult to see only in the divided and reduced video. Therefore, while monitoring a plurality of videos on the same screen, detailed observation of the video of a particularly remarkable screen becomes possible, and the monitoring function can be dramatically improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of a multi-segment screen display device as one embodiment of the present invention.

FIG. 2 is a diagram showing a circuit configuration of a PIP unit in FIG.

FIG. 3 is a diagram illustrating the relationship between a cutout area on an original screen and a display position of a multi-segment display screen.

4 is a diagram illustrating a detailed configuration of a comparator 2206 in FIG.

FIG. 5 is a waveform chart illustrating an operation of the comparator 2206 in FIG.

FIG. 6 is a diagram illustrating a relationship between a cut-out area on an original screen and a display position of a display screen during horizontal two-split display, and illustrating a step shift operation.

FIG. 7 is a flowchart for executing a PAN / TILT function.

FIG. 8 is a diagram illustrating a relationship between a cut-out area on an original screen and a display position on a multi-segment display screen during 4-split display and vertical 2-split display, and illustrating a step shift operation.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ identification code FI H04N 5/915 G09G 5/36 520L 7/18 H04N 5/91 K (58) Investigated field (Int.Cl. ⁷ , DB name) ) G09G 5/14 G09G 5/12 G09G 5/18 G09G 5/377 H04N 5/265 H04N 5/915 H04N 7/18

Claims (14)

(57) [Claims] 1. A display having a display screen for displaying a plurality of videos divided into different areas, and a display screen having the same number as the number of divisions of the display screen. A video processing unit for outputting to the display; an input video dividing means for distributing a plurality of input videos to a predetermined processing unit; and a display for controlling the video processing unit to zoom up and display the video in a desired divided area. A multi-split screen display device comprising: a control unit; and a video processing unit, wherein the video processing unit has an image memory, a writing unit that writes an input video to the image memory, and Reading means for reading at the timing of display in the area, wherein the display control means performs processing for zoom-in display. Means for controlling the writing speed of the writing means to the memory and / or the reading speed of the reading means from the memory in the unit; and a clipping frame for cutting out the image to be displayed in the assigned area on the display screen from the scanning field. And a cut-out frame selecting means for selecting a size of the cut-out frame, and a cut-out frame changing means for dividing the scanning field of the input video into a plurality of parts and changing the cut-out frame from one divided field to another divided field with time. Multi-segment screen display device. 2. A multi-segment display device, comprising a processing unit corresponding to the number of divisions of a display screen, wherein each unit processes different input images to be displayed in an assigned area on the display screen. Means for generating a pixel clock based on an incoming video signal, the unit comprising: an image memory; and a display magnification for selecting a size of a cutout frame in an input video to be displayed in an assigned area on a display screen. Selecting means; writing means for writing to the image memory at a pixel density corresponding to the video signal in the selected clipping frame; timing for displaying the video signal written in the image memory in an assigned area on the display screen Reading means for reading out at a time, wherein the writing means comprises a coordinate detecting means for detecting coordinates in a scanning field at each moment of a video signal. Means, determining means for determining whether the detected coordinates are within the range of the cutout frame, clock frequency changing means for changing the frequency of the sampling clock in accordance with the display magnification, and sampling the video signal at the period of the sampling clock. Sampling means, horizontal address designating means for designating a write address in the horizontal direction, vertical address designating means for designating a vertical direction address, and at each moment when the decision means decides that it is within the range of the cutout frame, Writing control means for writing the video signal sampled by the sampling means to the horizontal address, the area in the memory designated by the vertical address designating means, the clock frequency changing means having a display magnification of at least enlarged display. It can be changed to two types of 1: 1 display, at least one frequency divider and The selector switch selects a pixel clock as a sampling clock for enlarged display, and the selector switch selects, as a sampling clock, a clock obtained by dividing the pixel clock by a frequency divider for equal-size display. A multi-segment screen display device, characterized in that: 3. The horizontal addressing means is a first counter that counts a sampling clock, and the vertical addressing means is a second counter that counts a horizontal synchronization signal included in a video signal. Is reset when the horizontal component of the detected coordinates of the coordinate detecting means coincides with the right end coordinate of the display frame in the horizontal scanning direction. The second counter indicates that the vertical component of the detected coordinates of the coordinate detecting means is the upper end coordinate of the display frame. 3. The multi-segment display device according to claim 2, wherein the display is reset when the values match. 4. An X coordinate counter for counting the pixel clock until the coordinate detecting means is reset by a horizontal synchronization signal included in the video signal, and reset by a vertical synchronization signal included in the video signal. The multi-segment screen display device according to claim 3, further comprising a Y-coordinate counter that counts the horizontal synchronizing signal during the period up to. 5. The display magnification selecting means determines the size of the cutout frame by using the coordinate values of the upper left corner and the lower right corner of the cutout frame in the screen formed by the count values of the X coordinate counter and the Y coordinate counter. 5. The multi-segment display device according to claim 4, further comprising an output circuit for outputting a value. 6. The X-coordinate counter, wherein the determination unit includes:
The multi-segment screen display device according to claim 5, wherein the comparator is a comparator that compares a count value of a Y coordinate counter with a coordinate value output from the output circuit. 7. An X-direction start register for storing an X-direction start coordinate and a Y-direction start coordinate as a coordinate value of an upper left corner of a cutout frame, a Y-direction start register, and a coordinate value of a lower right corner. The multi-segment display device according to claim 5, further comprising: an X-direction end register for storing the X-direction end coordinates and the Y-direction end coordinates, and a Y-direction end register. 8. The cut-out frame X-direction moving means for rewriting the stored coordinate values, wherein the difference between the coordinate values stored in the X-direction start register and the X-direction end register is the same. The multi-split screen display device characterized by including: 9. The cut-out frame X-direction moving means: a cut-out frame forward direction movement control unit that rewrites the storage coordinates of an X-direction start register and an X-direction end register at a constant speed in an increasing direction, and a storage value of the two registers. Is compared with the value stored in the X-direction end register and the right end coordinate of the scanning field of the input video when the data is rewritten in the increasing direction.
A comparison unit; a cutout frame negative direction movement control unit that rewrites the storage coordinates of the X direction start register and the X direction end register in a decreasing direction at a constant speed when the stored value of the X direction end register matches the right end coordinate of the scan field; A second comparing section that compares the stored value of the X-direction start register with the left end coordinate of the scan field of the input image when the stored values of the two registers are rewritten in a decreasing direction; 9. The multi-segment screen display device according to claim 8, wherein when the stored value of the start register matches the left end coordinate of the scanning field, the clipping frame forward movement control unit is activated. 10. The cutout frame Y-direction moving means for rewriting the stored coordinate values, wherein the difference between the coordinate values stored in the Y-direction start register and the Y-direction end register is the same. The multi-split screen display device characterized by including: 11. The extraction frame Y-direction moving means includes: an extraction frame forward direction movement control unit that rewrites the storage coordinates of a Y-direction start register and a Y-direction end register in an increasing direction at a constant speed; and a storage value of the two registers. Is compared with the value stored in the Y-direction end register and the right end coordinate of the scan field of the input video when the data is rewritten in the increasing direction.
A comparing unit; a cutout frame negative direction movement control unit that rewrites the storage coordinates of the Y direction start register and the Y direction end register in a decreasing direction at a constant speed when the stored value of the Y direction end register matches the right end coordinate of the scan field; A second comparing unit that compares the stored value of the Y-direction start register with the left end coordinate of the scan field of the input image when the stored values of the two registers are rewritten in a decreasing direction; 9. The multi-segment screen display device according to claim 8, wherein when the stored value of the start register matches the left end coordinate of the scanning field, the clipping frame forward movement control unit is activated. 12. The multi-segment display device according to claim 7, wherein the scanning field of the input image is divided into a plurality of fields, and the output circuit is provided with the Y-direction start register, the Y-direction start register, and the X-direction end register. And a circuit for rewriting the coordinates stored in the Y-direction end register into the start point coordinates and the end point coordinates of different divided field portions at regular time intervals. 13. A multi-segment display device that processes a plurality of images input from a plurality of surveillance cameras by the same number of units as the surveillance cameras and divides and displays them on the same display screen. A connection switching unit that is inserted between the processing units and switches a connection state between the monitoring camera and the processing unit; and a display frame cutout position changing unit that changes a position where a display frame in a scanning field of the monitoring camera is cut out. The processing unit includes: an image memory; display magnification selection means for selecting a size of a clipping frame in a scanning screen of the surveillance camera to be displayed in an assigned area on the display screen; and a video signal in the selected clipping frame. Writing means for writing to the image memory at a pixel density corresponding to the following, and a video signal written to the image memory is written to an assigned area in the display screen. Reading means for reading out at the timing shown, and changing the display frame cutout position of each processing unit depending on how many processing units are supplied with the image of one monitoring camera by the connection switching means. Multi-screen display device. 14. A writing means comprising: a coordinate detecting means for detecting coordinates in a scanning field at each instant of a video signal; a determining means for determining whether or not the detected coordinates are within a range of a cutout frame; Clock frequency changing means for changing the frequency of the sampling clock in accordance with the above, sampling means for sampling a video signal at the sampling clock cycle, horizontal address specifying means for specifying a horizontal write address, and vertical for specifying a vertical address Address designating means, at each moment when the decision means decides that it is within the range of the cut-out frame, the video signal sampled by the sampling means is transferred to the memory area designated by the horizontal address and vertical address designation means. And writing control means for writing the data into the memory. 3 multi-division screen display device according.