JPH01268280A - Television monitoring method - Google Patents

Abstract

PURPOSE:To move an image-picked up picture, which is displayed on a television monitor, without moving a television camera and moving a subject by locally extracting the photo-detecting picture of an image-pick up element in the television camera, displaying the picture on a display and executing the selection and extraction of a local picture, which is displayed on the display, from the image-pick up element. CONSTITUTION:A picture signal to be obtained from an image sensor 3 of a camera unit 1 is A/D converted 6 and stored in an RAM 7, whose writing timing is controlled by a memory controller 8. Then, this picture signal of the RAM7 is D/A converted 9 and after that, it is displayed on a monitor 10 to be composed of a CRT and an LCD, etc. Thus, the photo-detecting picture of the image pick-up element 3 in the television camera 1 is locally extracted and displayed on a display 10 and the local picture to be displayed on the display 10 can be selected and extracted from the image pick-up element 3. Thus, since the arbitrary subject to be included in the picture, which is imagepicked up by the image pick-up element 3 in a wide range, can be selectively enlarged and displayed, the image-picked up picture to be displayed on the television monitor can be moved without moving the television camera and further without moving the subject.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a television monitoring method for displaying images captured by a television camera on a display.

(B) Prior Art A video telephone device has been developed in recent years as a television monitor device that displays images taken by a television camera on a display, and is now in practical use.

Such a videophone device is disclosed in Japanese Patent Application Laid-Open No. 56-158182.
As disclosed in the above publication, the device is configured so that the self-portrait to be transmitted to the other party's device can be confirmed on a monitor television before transmission.

Therefore, if your self-portrait does not fit on the display screen of the TV monitor, you will have to move the TV camera or move yourself, especially in a videophone device where the TV camera and TV monitor are integrated. Moreover, there is a limit to the movement of the mouth, especially when moving upwards, which may impede monitoring work.

Furthermore, even with a television monitor device such as a visitor monitor device, there is an inconvenience that, for example, a short child cannot fit within the monitor's field of view. In addition, even if a wide-angle lens is used to enlarge the monitor's field of view in an attempt to solve this problem, the subject displayed on the TV monitor becomes smaller, and there is a risk that guests may not be able to be seen.

(c) Problems to be Solved by the Invention The present invention provides a television monitoring method that can move the captured screen displayed on the television monitor without moving the television camera or moving the subject. be.

(d) Means for Solving the Problems The television monitoring method of the present invention displays an image captured by a television camera on a display device. The local screen to be displayed on the display can be selectively extracted from the image sensor.

(e) Effect: According to the television monitoring method of the present invention, the light-receiving screen of the image sensor of the television camera can be locally extracted and displayed on the display, and the local screen to be displayed on the display can be selectively extracted from the image sensor. Therefore, it is possible to selectively enlarge and display any object included in a screen imaged over a wide area by an image sensor.

(f) Embodiment FIG. 1 shows an embodiment in which the television monitoring method of the present invention is applied to a visitor monitoring device.

In the figure, (1) is a camera unit that is embedded in the entrance door, for example, and includes a wide-angle lens (2) for forming an image of a visitor, and a wide-angle lens (2) that forms an image of the visitor. The image sensor includes a CCD image sensor (3) that photoelectrically converts the image, a driver circuit (4) that drives the image sensor, and a timing generation circuit (5) that generates drive timing for the driver circuit (4).

The image signal obtained from the image sensor (3) of the camera unit (1) is A/D converted (6), and the write timing is controlled by the memory controller (8).
The image signal of this RAM (7) is stored in D
/ After A conversion, monitor (10) consisting of CRT, LCD, etc.
will be displayed. Note that the key switch (11) is a key switch for instructing the memory controller (8) to move the displayed image.

A feature of such a device is the address control of the memory controller (8).

Figure 2 shows the memory address generation circuit of the memory controller (8), and Figure 3 shows the CCD image sensor (3).
The captured image is shown. Note that the hatched lines on the four sides of FIG. 3 are blanking periods, and the effective horizontal scanning line period H1 and the effective vertical scanning line period V constitute an effective screen.

In FIG. 2, an H counter obtains the period of the effective horizontal scanning line period H1 based on the sampling clock, and (13) indicates the effective vertical scanning line period V based on the horizontal scanning line pulse HP.

It is a V counter that obtains the period. (14) is an up/down counter that obtains the initial value to be loaded into the H counter (15), and the value is counted up when the movement control switch (S, ) is operated, and the value that is counted down when the switch (S, ) is operated. 1 is stored in the H counter (15) as the initial value of the H counter (14). (12) is an up/down counter that obtains the initial value to be loaded into the V counter (13), and the movement control switch (Sd) The value counted up by operating the switch (S, ) and counted down by operating the switch (S, ) becomes the initial value of the V counter (13).(16
) is a synthesis circuit that synthesizes the outputs of both counters (13) and (15) to obtain a memory address.

Such a movement control switch (s,)(s+)(sa>
(s.) can be used in combination to act as a movement direction switch such as a joystick.

Therefore, by operating these four movement control switches,
The output of the camera unit (1) as shown by VXH in Fig. 3 is written to the RAM (7) while being limited to an arbitrary horizontal area shown by (V/2)X(H/2). It happens. In this way, the image signal written in the RAM (7) is immediately read out, and the visitor in the image area is displayed enlarged in the center of the monitor (10) as shown by the broken line frame W in FIG.

FIG. 4 shows a video telephone device adopting the television monitoring method of the present invention, which includes a camera unit (1), a monitor (
10) is integrated into the telephone (17), and the monitor (1
Move the self-portrait reflected in 0) to the moving direction switch (S,) (S
J) (S,) You can use (S,) to move to the center of the screen.

In the above explanation, we have shown a configuration in which the RAM (7) has a memory capacity equal to the number of pixels of the CCD image sensor (3).
It is also possible to store the images in (7), monitor them, display them all in (10), then narrow down the target to a local subject and enlarge and display it again.

In this case, if the enlarged target frame can be displayed in a movable manner during the full-screen monitor, the target can be narrowed down easily.

(G) Effects of the Invention The television monitor of the present invention is capable of locally extracting the light-receiving screen of the image sensor of the television camera and displaying it on the display, and selectively extracting the local screen to be displayed on the display from the image sensor. This technology allows you to selectively enlarge and display any subject included in the screen that has been imaged over a wide area with the image sensor, so you can display it on the TV monitor without moving the TV camera or moving the subject. The displayed imaging screen can be moved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a visitor monitoring device employing the television monitoring method of the present invention, FIG. 2 is a circuit diagram of the main part of the device shown in FIG. 1, and FIG. 3 is a schematic diagram for explaining the operation of the method of the present invention. FIG. 4 is an external view when the method of the present invention is used in a videophone. (1)...Camera unit, (7)...Memory, (
8)...Memory controller, (10)...Monitor, (11)...Key switch, (12)(14)...
・Up/down counter, (13)(14)...Counter, (S,)(5,>(S,>(Sl)...Movement direction indication switch.

Claims (1)

[Claims] (1) In a television monitoring method in which images captured by a television camera are displayed on a display device, the light receiving screen of the image sensor of the television camera is locally extracted and displayed on the display device, and the local screen displayed on the display device. A television monitoring method characterized in that it is possible to selectively extract from an image sensor.