JPS6048951B2 - Screen setting method for still image transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a still image transmission screen setting method for transmitting one screen of a television signal through a narrowband transmission path.

Conventionally, distant monitoring using an industrial television has been carried out by attaching a television camera to an electric rotating platform and using an electric zoom lens, which are remotely controlled from the receiving side.

In this case, since normal television signals were constantly being sent from the television camera, remote control operations on the receiving side could be performed while watching the receiving side's television monitor. However, recently, still image transmission, which transmits one screen of a television signal using a narrowband transmission path, has been put into practical use. A problem has arisen in which it is difficult to remotely control the camera. In the present invention, on the receiving side, a marker indicating the range of the screen to be transmitted and its center point is placed on the receiving side's television monitor on the screen of the monitoring point that was first sent. Still image transmission solves the above problem by displaying the above images in a superimposed manner, moving this marker on the screen by operation on the receiving side, setting the next screen to be transmitted, and starting transmission of the next screen. This provides a screen setting method for

The present invention is intended to obtain a desired screen by remotely controlling the pan head and zoom lens of a television camera installed at a monitoring point on the receiving side in a still image transmission system, but it is a still image transmission system. Therefore, unless one screen is transmitted first, it is unclear which direction the television camera at the monitoring point is facing. For this reason, one screen is first transmitted and displayed on the receiving side's television monitor. By specifying two elements, the center and the enlargement or reduction ratio of the screen to be sent next, using this one screen as a reference, the next desired screen can be obtained.
For this reason, a marker chart is prepared on the receiving side that shows the center of the screen and the screen range according to the focal length of the zoom lens, this chart is imaged with a television camera, and the center of this chart and the transmitted screen are When the charts are centered and superimposed and displayed on the receiving television monitor, the chart appears on the television monitor as a marker for specifying the next desired screen. Therefore, in order to set the center of the screen, the center point of the marker moves on the screen by moving the television camera for chart imaging horizontally and vertically. In conjunction with this, the television camera at the monitoring point is also remotely controlled so that it points exactly in the direction of the center of the marker on the screen. Next, you can remotely control the zoom lens by displaying the focal length of the zoom lens, which indicates the screen range, to determine how much the screen should be enlarged or reduced, and then remotely control the start of transmission of the next image. The desired screen can be transmitted. Next, the present invention will be described in detail with reference to the drawings of an embodiment of the present invention.

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

In the figure, there is a scene 11 to be monitored, a television camera 12 is provided at the monitoring point, and the television camera 1
2 is provided with an electric zoom lens 13 and an electric rotating pan head 14. On the receiving side, there is a chart 21 for screen setting, and a television camera 22 for taking an image of the chart 21 is provided.

The camera 22 is provided with an electric zoom lens 23 and an electric rotating pan head 24. The monitoring point television camera output 15 is supplied to the transmitting section 16 of the still image transmitting device and sent to the receiving section 25 via the transmission line 31.

Television camera 2 for imaging of screen setting chart 21
2 output 27 is sent to the video signal mixing circuit 28. The signal is sent and superimposed on the video signal from the receiving section 25.

The superimposed image is displayed on a monitor 29. The push button 41 commands the start of still image transmission provided on the receiving side and also to the electric rotating pan head 24! In contrast, the camera 22 is initially set to face the center of the chart 21.

The operating lever 42 is used to remotely control the electric rotating pan head 14, 24, and at this time, the connector 52 is connected to the pan head 14.
, 24 operate in a predetermined relationship,
Specifically, the center of the image captured by the camera 22 and the camera 12
The center of the imaged screen is moved in the opposite direction.

The adjustment knob 43 interlocks and remotely controls the zoom lenses 13 and 23. FIG. 2 shows a chart 21 for screen settings.

In the chart 21, a mark 281 indicating the center and a line 202 indicating the screen range for each focal length of the zoom lens
, 203, 204, 205, and the lines 203, 204,
Focal lengths X,,X corresponding to 205. ,X. mm is marked. FIG. 3 shows the related operations in the horizontal direction when setting the center of the screen of the television camera 12 at the monitoring point and the chart imaging camera 22, and shows the center line 301,
Reference numeral 302 indicates the center line of the screen where the television camera at the monitoring point and the chart imaging television camera are facing the subject. The center line 304 is the center line when the television camera is turned to the left by α degrees in order to change the center of the screen of the chart to the right by α degrees. In this case, the television camera at the monitoring point is used for chart imaging. On the contrary, this indicates that the imaging center needs to be moved to the right by α°, that is, to the center line 303. Next, the operating method of the embodiment of the present invention will be explained with reference to FIGS. 1, 2, and 3.
First, the focal lengths of the zoom lenses 13 and 23 are minimized using the remote control knob 43, and the still image transmission start button 41 is pressed to transmit one screen of still images. At this time, the chart imaging television camera 22 is reset to the electric rotating platform 24 by a reset signal from the push button 41 so that the center of the chart becomes the center of the screen. On the screen of the monitor 29 of the mixed signal of the image output 26, a still image and a chart showing the screen range according to the center of the screen and the focal length of the zoom lens are mixed and displayed. Next, in order to align the marker 201 indicating the center with the center of the screen on which reception is desired next, the electric rotating pan head of the chart imaging television camera 22 is remotely controlled using the horizontal/vertical operating lever 42.

For example, if the center of the next screen you wish to receive is horizontally shifted by α° to the right of the currently received screen, the television camera for chart imaging will be directed to the left by α°, as shown in Figure 3. At the same time, the direction of the monitoring point television camera is changed by α° to the right. Next, use the chart in Figure 2 to measure the focal length of the zoom lens, centering on this set point. If you need the range imaged by =, turn the remote control knob 43 of the zoom lens to X. - Set to -. Thereafter, by operating the still image transmission start pushbutton 41, the next screen to be sent is shifted to the right in the horizontal direction by α° with respect to the previously sent screen, and the focal length of the zoom lens is set to X. . The range corresponding to - will be sent. It is also possible to set the vertical direction using a similar method. In this embodiment, the marker is moved by moving the chart imaging television camera, but the chart may be moved and the monitoring point television camera may be remotely controlled according to the amount of movement.

It is also possible to generate the marker using a purely electronic pattern generator, such as a digital memory, and to move the marker electronically, and to remotely control the monitoring point television camera based on the amount of change. As explained above, the present invention utilizes the screen of the still image that is initially sent, and then sets the screen range for which reception is desired by moving the marker superimposed on that screen, and by the amount of movement. Accordingly, the zoom lens head of the television camera at the monitoring point can be remotely controlled and the next screen to be sent can be set in advance on the receiving side, making the monitoring point unmanned and effective for still image transmission. It has an effect that can be used for many purposes.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an embodiment of the present invention, Fig. 2 is a chart for generating markers for screen setting, and Fig. 3 is a chart for determining the horizontal position of a television camera for chart imaging and a television camera of a monitoring point. It is an explanatory diagram showing a relationship. In the figure, 12, 22... television camera, 1
3,23...Electric zoom lens, 14,24...
- Electric rotating pan head, 16... Transmitting section, 21... Chart, 25... Receiving section, 28... Video signal mixing circuit,
29...Monitor, 41...Still image transmission start button, 42...Electric swivel head control lever, 43
...Zoom lens adjustment knob, 52...Connector.

Claims (1)

[Claims] 1. In a still image transmission system that narrowband transmits one screen of a television signal, the first transmitted screen is used, and a marker indicating the range and center of the next screen to be transmitted is superimposed on this screen. By moving this marker on the screen, you can set the next screen to be sent, and in conjunction with this setting, remotely control the direction and lens focal length of the television camera at the monitoring point. This screen setting method for still image transmission is characterized in that the same screen as the set screen is captured by a television camera at a monitoring point, and then still image transmission is started from the receiving side to transmit the desired screen.