JPS59198092A - Still picture transmitter - Google Patents

Abstract

PURPOSE:To improve the effect of supervision by selecting optionally a visual field to be transmitted next. CONSTITUTION:After one screen's share of a picture signal of a television camera 1 is recorded in a transmission memory 7, the result is transmitted to a transmission line 20. The receiving side allows this still picture to display on a television monitor 37. In displaying a desired region on the monitor 37 by means of a marker, marker address of a receiving memory 32 is read, the result is transmitted to a transmission side via a transmission line 20 and then transmitted to a moving amount operating section 9 via a transmission control section 10 of the transmission side. The moving amount operating section 9 operates a picture angle and a direction of rotation required to image pick up the region from the marker address and commands the amount of movement to a drive control section 8. The drive control section 8 drives a motor driven zoom lens 2 and a rotation stand 4 and after they are moved by a prescribed amount, a transmission start signal is outputted to transmit the picture.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for transmitting a television signal as a still image via a narrowband transmission path, in which a necessary field of view is arbitrarily selected and the image is transmitted. It is related to the device.

In general, still image transmission via a narrowband transmission path requires a long time to transmit one image, so it is extremely difficult to set the field of view while monitoring the received image. . For this reason, a preset control is required in which a position is preset in advance, and when this position is selected, it automatically moves to and stops at this set position. Conventional preset control has the disadvantage that the preset data storage capacity increases according to the number of required fields of view, making the device extremely large, and that it is not possible to select an arbitrary field of view because the preset data cannot be easily changed from the receiving side. Ta.

This invention was made to eliminate these drawbacks of the conventional methods, and it is possible to select an arbitrary field of view and automatically move the previous received image by stepping the amount of movement from the determined field of view to the selected field of view. It is an object of the present invention to provide a still image transmission device that transmits images.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, (1) is a television camera, (2) is an electric zoom lens that obtains a predetermined angle of view, (3) is an angle of view detector that detects the angle of view position of this electric zoom lens (2), and (4) is an electric zoom lens that obtains a predetermined angle of view.
) is a rotary table that obtains a predetermined angle of view, and (5) is this rotary table (4
), (6) is a high-speed AD converter that converts the image signal of the television camera (1) into a digital signal, and (7) is this high-speed AD converter (6).
) A transmission memory that records the output for one angle of view, (8) moves the electric zoom lens (2) and rotary table (4) to a predetermined position using the output of the angle of view detector (3) and the output of the rotational position detector (5). A drive control unit that moves to a position and stops, (9) a movement amount calculation unit that instructs the drive control unit (8) to move, and (10) a transmission side transmission unit that sends and receives data to and from the transmission line. control unit,
01) is a receiving side/transmission control unit that sends and receives data in the opposite direction to this sending side transmission control unit (10), and (321 is a receiving side/transmission control unit that records one screen worth of image data from this reception 11 + transmission control unit Gll). Memory, country is a high-speed DA converter that converts the image data output from this receiving memory into an analog signal, (goods) is a marker generator that generates a marker indicating the required field of view, and (to) is used to move this marker. A field of view specifying means (4) which is a manipulator and is used to designate the field of view to be transmitted next by the marker generator (to) and the manipulator (to).
0). A television monitor displays a signal from the high-speed DA converter (a mixing device that superimposes the output of the marker generator).

Next, the operation of the still image transmission apparatus of the present invention will be explained using FIG.

The image signal of the television camera (1) is recorded in one screen in the transmission memory (7) upon activation of transmission, and then sent out to the transmission path (20). On the receiving side, the image data from the sending side is
By recording the screen and performing high-speed scanning, a still image is obtained and displayed on a television monitor. The area to be transmitted next is displayed with a marker on the received image displayed on the television monitor. By inputting the center position and size of the marker from the operator (Zheng) to the marker generator, it generates a signal that whitens out the periphery of a predetermined area, or a signal that cross-displays the four corners of this area. mixer (st)
As a result, the signal is superimposed on the above-mentioned image signal and displayed on the television monitor. Therefore, by selecting the aforementioned center position and size, the marker can be moved to any position within the received image, and its size can also be changed arbitrarily.

Next, read the marker address on the reception memory (2). This marker address is a reception memory address that indicates the position and size of the marker, and can be expressed in the following two ways.

The first method is to express the marker center point address and the number of horizontal pixels in the marker area×the number of vertical lines.

The second method is to express it using addresses at the four corners of the marker.

Next, this marker address is sent to the receiving side transmission control unit (31
1 through the transmission path (20) to the transmitting side (transmission control unit (
It is transmitted to the movement amount calculation unit (9) via +(]). The movement amount calculating section (9) calculates the angle of view and rotation direction necessary to image the marker area from this marker address, and instructs the drive control section (8) about the amount of movement from the current position.

The drive control unit (8) controls the electric zoom lens (2) and the rotary table (
4) is driven and stopped when the above-mentioned movement amount is reached, and a transmission activation signal is output to perform image transmission.

In this way, the receiver 11+ can receive images in the range indicated by the marker.

Figure %2 shows the address of the receiving memory country and the marker address. In the figure, A is the received image, B is the center point of the received image,
C is a marker, D is the center point of the marker, and if the reception memory is configured with the number of horizontal pixels N and the number of vertical lines M, the memory (
Any position in (2) is a horizontal address 1. ...1N and vertical address 1. ... Uniquely determined by selecting 2M.

That is, the first method of expressing the marker address is the marker center point address (n, m) and the number of pixels pXq of the marker.

q q pq ) + (n +-rn+-) , (n-th, m-1
-, ) are expressed as four sets of at 2 2' 2 addresses.

FIG. 3 is a diagram showing the actual imaging range of the television camera (1) for the received image A and the marker area C.

In the figure, the received image A is at a distance (1) from the television camera (1).
) is t.

In the above, calculation of the amount of movement of the received image A from the imaging position for the television camera (1) to image the marker area C will be explained.

The imaging range in FIG. 3 corresponds to the memory address diagram in FIG. 2. In addition, the angle of view that determines the imaging range of the received image A is determined by the angle of view detector (3) of the electric zoom lens (2), so if you set the distance, you can change the angle of view from the above angle of view. The horizontal width W can be calculated. On the other hand, W and t of the marker area C can be easily determined from the marker address given from the controller can. The amount of rotational movement for imaging the marker area C is the amount obtained by decomposing the angle between L and t into a horizontal rotation angle and a vertical rotation angle in FIG. Number of horizontal pixels in the diagram N, number of vertical lines M, marker center point D (n,
m) can be calculated.

Next, the angle of view for imaging the marker area C includes a horizontal angle of view and a vertical angle of view, and the horizontal angle of view is the center of the viewing angle in the marker fl.
This is the angle formed by the lines t1 and t2 that connect the point where the marker intersects the horizontally parallel line passing through D and the television camera (1), and the vertical angle of view can also be defined in the same way.

These are respectively t1. t2. It can be calculated using w.

The screen ratio between the horizontal and vertical angles of view is 4:3, so
Prioritize the one with the worse conditions of the two angles of view calculated above,
That is, the angle of view is determined with priority given to one of the angles of view so that the entire marker region C is imaged.

As explained above, the amount of movement for imaging the marker area can be calculated from the angle of view that determines the field of view of the received image.
Just specify the marker address from the reception 911+,
It can be seen that the above movement amount can be automatically calculated.

Note that the above explanation assumes that the marker area C is within the received image A, but even if the marker is set in an area other than the received image A, there will be no virtual data outside the area in the sending memory or receiving memory. If the address is set, the amount of movement can be calculated, so similar operations can be performed.

Furthermore, in the above embodiment, an operation was described in which the receiving side sends a marker address indicating the next area to be transmitted and transmits a new image after movement. By incorporating it into the field of view specifying means, when the change occurs, movement can be started to a predetermined field of view and an image can be transmitted. Further, movement can also be started in a predetermined field of view using an external signal. Furthermore, it is also possible to display the next field of view transmitted on the receiving side television monitor superimposed on the previous received image.

As described above, according to the present invention, in a still image transmission device that transmits an image signal captured by a television camera as a still image to a remote point via a transmission path, the field of view to be transmitted next can be arbitrarily selected. , the movement M to this field of view is calculated from the specifications of the field of view that determined the above-mentioned received image, and the movement is automatically performed, and when the required field of view is obtained, image transmission is performed, so the next transmission The image to be displayed can be arbitrarily selected without monitoring the previous received image, and the effect of increasing the monitoring effect can be obtained.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram of memory addresses and marker addresses in the device shown in Fig. 1, and Fig. 3 is an illustration of the addresses shown in Fig. 2 and the actual imaging range. It is a diagram showing correspondence. In the figure, (1) is a television camera, (2) is an electric zoom lens, (3) is an angle of view detector, (4) is a rotating table, and (5) is a
) is a rotational position detector, (6) is a high-speed AD converter, (7)
is the transmission memory, (8) is the drive control section, (9) is the movement amount calculation section, 00) is the transmission side transmission control section, 20+ is the transmission path, c
31) is the reception side transmission control unit, ■ is the reception memory, connection is the high-speed DA converter, (goods) is the marker generator, (to) is the controller, (40) is the field of view specifying means, (support) is the mixing vessel,
(9) is a television monitor. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] +11 A television camera on the transmitting side that captures a still image of an object, a transmission memory that temporarily stores the still image of this television camera, and a transmission line that transmits the still image from this transmission memory. In a still image transmission device, the still image transmission device includes a receiving memory that temporarily stores the transmitted still image, and a television monitor on the receiving side that displays the still image from the receiving memory. a visual field specifying means for specifying the visual field to be transmitted, and an electric zoom of the television camera from the previous visual field to the visual field to be transmitted, which is instructed by the visual field specifying means and transmitted to the transmission side via the transmission path. A movement amount calculating section that calculates the amount of movement of the lens or rotating table, and a drive control section that drives the electric zoom lens or rotating table and starts transmission according to the output of the moving amount calculating section. A still image transmission device characterized by: (2) The still image transmission device according to claim 1, wherein the visual field specifying means is capable of specifying a preset visual field as the visual field to be transmitted next by external input. (3) Claims 1 or 2, characterized in that the receiving side 1 television monitor is capable of displaying the field of view to be transmitted next, superimposed on the previous received image. Still image transmission device described. (4) When the image signal within a predetermined field of view in the imaging range of the television camera has changed compared to the previous image signal, the visual field specifying means detects this change and specifies the predetermined image signal. The still image according to any one of claims 1 to 3, characterized in that the still image has built-in image change detection means for supplying the visual field to the movement amount calculating section as the visual field to be transmitted next. Transmission device.