JPH0638214A - Video interphone - Google Patents

Abstract

PURPOSE:To allow conversation against a visitor to be concentrated by using a display position means so as to designate the position of the visitor to be displayed with magnification and changing the position of magnification display in following to the motion of the visitor detected by a position detection means. CONSTITUTION:When taking is started, a display position moving means 7 is moved manually to a position at which a visitor is resident. When the operation is finished, a position detection means 5 starts the operation and compares a preceding picture with a current picture to detect the change in the position of the visitor. Position change information is stored in the frame memory A of a magnification display means 6 and a part of the picture is zoomed and displayed on the screen by a read position command from a frame memory control means 6B. The read position of the means 6b is manually set by the means 7 and is changed automatically by the output of the means 5. Picture data being a digital signal outputted from the means 6 are converted by a D/A converter 8 and outputted. Thus, the visitor is always displayed in the middle of the screen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a television intercom capable of taking a picture of a visitor's face or figure with a television camera in a general house or a group house and checking the monitor in the house.

[0002]

2. Description of the Related Art A conventional TV intercom has an image pickup range of about 60 degrees in horizontal angle and about 45 degrees in vertical angle. There was a drawback that you couldn't see it. Therefore, there is a method in which the image pickup lens of the TV camera is wide-angled to enlarge the image pickup range and a part of the area is cut out and electronically enlarged and displayed. Even if you move the display position to the part you want to see, the visitor does not always stay in the same place during a call.In such a case, you must always operate the buttons on the operation panel to adjust the display position. It had the drawback that it had to be.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to match the movement of a specific part such as the face of a visitor to be seen. It is to provide a television intercom that can automatically follow the display position.

[0004]

According to the present invention, in order to solve the above-mentioned problems, as shown in FIG. 2, a slave unit 10 having a television camera 11 equipped with a wide-angle lens and an image signal are provided. As shown in FIG. 1, in a television intercom including a signal transmission system 20 for transmission and a master device 30 having a monitor TV 31 for displaying an image from the slave device 10, as shown in FIG.
A / D conversion means 1 for digitizing the received image signal
A sync separation means 2 for extracting a sync signal from the received image signal; an address generation means 3 for generating an address in the horizontal / vertical direction from the sync signal; and writing / reading of image data according to the address. Therefore, the frame memory 4 for storing the past frames, the position detecting means 5 for detecting the positional change of the visitor from the image data from the frame memory 4 and the current image data, and the visitor of the visitor by the monitor TV 31. Display position moving means 7 for manually moving the display position, frame memory 6A for storing the digitized image data, and frame memory control means for controlling the reading of the image data so that a zoom image can be obtained from the frame memory 6A. 6B and an output of the enlarged display means 6 is an analog video signal. The frame memory control means 6B in the enlarging display means 6 is provided with a D / A converting means 8 for converting, and after the initial enlarging display position is manually designated by the display position moving means 7, the frame memory controlling means 6B responds to the movement of the visitor. It is characterized in that the display position is automatically changed.

[0005]

According to the present invention, with the above-described structure, after the display position moving means 7 manually specifies the position of the visitor, the position detecting means 5 changes the movement of the specific part of the visitor. The display position can be automatically tracked by the visitor.

[0006]

FIG. 2 shows the overall construction of an embodiment of the present invention. In this embodiment, for example, in a general house or an apartment house, the face and figure of a visitor can be photographed by the TV camera 11 and the monitor device 30 of the TV intercom that can check the monitor in the house can be configured as shown in FIG. The electronic zoom means 33 is added. This television intercom includes a television camera 11 equipped with a wide-angle lens and a child device 10 having a microphone 12 for collecting a voice of a visitor, and a child device 10.
Signal transmission system 20 for transmitting image signals and audio signals from the
And a monitor TV 31 that displays an image from the child device 10.
And the parent device 30 having the speaker 32 for outputting the sound from the child device 10, and by using the wide-angle lens, the face and figure of the imaged visitor are relatively small, but the portion to be zoomed is electronically zoomed. An image of a size that is easy to see can be obtained by electronically enlarging the image by 33 and displaying it on the monitor TV 31.

The detailed construction of the electronic zoom means 33 used in this embodiment is shown in the block diagram of FIG. The image signal from the slave unit 10 is input to the A / D conversion unit 1 and the sync separation unit 2. The sync separation means 2 extracts both horizontal and vertical sync signals from the image signal. The other circuits operate in synchronization with this synchronization signal. Further, the sync separation means 2 generates a pixel sampling clock synchronized with the sync signal and supplies it to the A / D conversion means 1. The address generator 3 counts the pixel sampling clock to generate a horizontal address, and further counts a horizontal synchronizing signal to generate a vertical address. The image data sampled and digitized by the A / D conversion unit 1 in pixel units is temporarily stored in the frame memory 4 using the addresses in the horizontal and vertical directions. The image data stored in the frame memory 4 is input to the position detecting means 5 together with the image data of the next frame, and the representative position of the change area in the image is calculated. In order to calculate this representative position, for example, the position of the center of gravity of the changing area may be calculated. The image data from the A / D conversion means 1 is stored in the frame memory 6A in the enlarged display means 6, and a part of the image is zoomed and displayed on the entire screen in response to a read position command from the frame memory control means 6B. . The read position by the frame memory control means 6B is manually set by the display position moving means 7, and then automatically changed by the output of the position detecting means 5. The image data of the digital signal output from the enlargement display unit 6 is converted into an analog video signal by the D / A conversion unit 8.

The operation of the present invention will be described below with reference to FIGS. FIG. 3 shows an enlarged image of the visitor 9 standing to the left of the gate. Here, if the visitor 9 moves to the right corner of the screen G for some reason,
According to the conventional technique, unless the display image is moved to the right by operating the display position moving means 7, the visitor 9 will be bent toward the right corner of the screen G as shown in FIG. It was necessary to adjust the display position by the display position moving means 7 each time the display position was moved. The display position moving means 7 usually includes operation buttons for scrolling the screen in the four directions of up, down, left and right, and when starting a call, first, the display position moving means 7 is manually moved to the position where the visitor 9 is. The position detecting means 5 starts operation from the time when the operation is completed, the change in the position of the visitor 9 is detected by comparing the previous image and the current image, and the position change information is displayed in the frame of the enlarged display means 6. It is sent to the memory control means 6B to adjust the display position. By such an operation, even if the visitor 9 moves during a call, the position can be followed. For example, as shown in FIG. 4, even if the visitor 9 moves to the right corner of the screen G, the display position moving means 7 can be operated by automatically tracking the movement of the visitor 9. Instead, as shown in FIG. 5, the visitor 9 can be always displayed in the center of the screen G.

[0009]

According to the present invention, in a television intercom that images a visitor using a wide-angle lens and electronically enlarges it, the position of the visitor's face or the like to be enlarged is manually operated by the display position moving means. Then, by changing the position to be enlarged and displayed following the movement of the visitor detected by the position detection means, the in-home receptionist always operates the display position movement means according to the movement of the visitor. It has the advantage that you can save time and concentrate on the conversation with the visitors.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a television intercom to which the present invention is applied.

FIG. 3 is a first operation explanatory diagram of the present invention.

FIG. 4 is a second operation explanatory diagram of the present invention.

FIG. 5 is a third operation explanatory diagram of the present invention.

[Explanation of symbols]

 1 A / D conversion means 2 Sync separation means 3 Address generation means 4 Frame memory 5 Position detection means 6 Enlarged display means 6A Frame memory 6B Frame memory control means 7 Display position moving means 8 D / A conversion means

Claims (1)

[Claims] 1. A television intercom comprising a child device having a television camera equipped with a wide-angle lens, a signal transmission system for transmitting an image signal, and a parent device having a monitor television for displaying an image from the child device. A / D conversion means for digitizing the image signal, synchronization separation means for extracting the synchronization signal from the received image signal, address generation means for generating horizontal / vertical addresses from the synchronization signal, and corresponding to the address A frame memory for storing a past frame by writing / reading image data by using the image data; a position detecting means for detecting a positional change of a visitor from the image data from the frame memory and the current image data; and the monitor. Display position moving means for manually moving the display position of the visitor on the TV and digitalized image display A magnifying display means including a frame memory for storing data and a frame memory control means for controlling reading of image data so that a zoom image can be obtained from the frame memory, and an output of the magnifying display means is converted into an analog video signal. D / A conversion means, and the frame memory control means in the enlarging display means automatically designates the initial enlarging display position after the display position moving means manually specifies the initial enlarging display position. A television intercom characterized in that it is configured to change.