JPH02170691A - Picture transmission equipment - Google Patents

Abstract

PURPOSE:To properly transmit only a required part of a picture by providing a control circuit which sets an arbitrary fundamental area of picture data to be transmitted through a setting latch and transmits only the picture corresponding to the set mode around this area and arbitrarily moves the fundamental position in the horizontal or vertical direction. CONSTITUTION:The picture signal inputted to a video input terminal 1 passes an A/D converting part 2, a frame memory part 3, a data processing part 4, and a transmission processing part 5, and the picture signal of the whole of a picture is outputted and transmitted from a line output terminal 6. At the time of transmitting a part of the picture, a signal indicating this transmission from a video mode select input terminal 7 and a synchronizing signal from a vertical synchronizing input terminal 8 are inputted to a vertical address counter 9, and its value is given to the frame memory part 3 through a memory 10. Set values are inputted to vertical and horizontal set latches 12 and 16 from vertical and horizontal set input terminals 11 and 15 respectively, and these values are inputted to a vertical address counter 9 and a horizontal address counter 14 to extend the position control range.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image transmission device, and particularly to an image transmission device capable of transmitting only image data of a position on a screen.

[Conventional technology] Figure 5 is from Mitsubishi Electric Technical Report (7) VOl, 60, No.

10 is a block diagram of a transmitting portion of an example of a conventional image transmitting device shown in FIG.

In FIG. 5, the video signal from the video input terminal (1) is transmitted to an analog-to-digital converter E (hereinafter referred to as A/D converter) (2), a frame memory section (3), a data processing section (4), Line output terminal (6) via transmission processing section (5)
Sent from In addition, this device includes a vertical address counter (1) that counts vertical synchronization pulses based on signals from a video mode selection terminal (7) and a vertical synchronization input terminal (8).
9), and a memory (10) that controls the output of the frame memory section (3) based on the output value of the vertical address counter (9).

Next, the operation will be explained. A video signal input from a video input terminal (1) is converted into multi-bit binary data by an A/D converter (2). The converted data is temporarily stored in the frame memory section (3). The data stored in the frame memory section (3) is sequentially input to the data processing section (4). The data processing unit (4
) is compressed and encoded into an amount that satisfies the capacity of the transmission line, and is input to the transmission processing section (5). In the transmission processing section (5), the human data is converted to match the transmission form and method, and is output to the transmission line from the line output terminal (6).

The conventional example shown in FIG. 5 is provided with a video mode selection input terminal (7) in order to improve tracking of image movement, in addition to the data compression ability of the data processing section (4). This operation will be explained with reference to the explanatory diagram of FIG.

When holding a meeting, etc. using an image transmission device, the 6th
As shown in the figure, by transmitting the central area of the screen,
Sometimes that is enough. Therefore, by selecting from the video mode selection input terminal (7) that only the above-mentioned center area of the screen is necessary, the vertical synchronization pulse input from the vertical synchronization input terminal (8) is sent to the vertical address counter (9). and count.

The counting output of the vertical address counter (9) mentioned above becomes the address input of the memory (10), and as shown in Fig. 6, the area other than the central area of the screen, that is, the upper part of the screen out of 4N (N is an integer) of the entire screen. When the address input indicates N lines and N lines at the bottom of the screen, the memory (10) outputs a control signal that does not require output to the frame memory unit (3), and this frame memory unit (3) processes the video data. It will no longer be output to section (4). By the above operation, data of only the central portion as shown in FIG. 6 is transmitted, thereby performing image transmission with good motion tracking performance.

[Problems to be Solved by the Invention] Since the conventional image transmission device is configured as described above, when a mode for transmitting the central area of the screen is selected,
a frame memory section (controlled by a memory (10));
The output of 3) is fixed at the center and fits in half of the screen, but there is a problem that it cannot correspond to images that are not displayed in the center.

The present invention has been made to solve such problems, and an object of the present invention is to provide an image transmission device in which the transmission part can be freely set when a mode for transmitting a part of the screen is selected.

[Means for Solving the Problems] An image transmission device according to the present invention includes a setting latch that outputs a position setting signal to an address counter when a mode is set in which only image data corresponding to a part of the screen is transmitted. , has a setting input terminal for inputting a setting value to this setting latch.

[Function] In the image transmission device according to the present invention, the position setting signal input to the address counter changes depending on the data input from the setting input terminal, and the setting value for controlling the frame memory section is changed, thereby changing the screen to be transmitted. The screen part that transmits data moves.

[Embodiment] Next, the invention will be described in more detail based on the drawings showing an embodiment of the image transmission device according to the invention.

In Fig. 1, the image signal input to the video input terminal (1) is sent to the A/D converter (2) and the frame memory unit (3).
, a data processing section (4), and a transmission processing section (5), and the image signal of the entire screen is output and transmitted from the line output terminal (6). If only part of the screen is to be transmitted, input a signal to that effect from the video mode selection input terminal (7) and a synchronization signal from the vertical synchronization input terminal (8) to the vertical address counter (9). This is achieved by providing the value to the frame memory unit (3) via the memory (10).

According to the present invention, the position adjustment range can be adjusted by inputting a setting value to the vertical setting latch (12) from the vertical setting input terminal (11), and inputting this value to the vertical address counter (9). It is expanding.

Next, the operation will be explained with reference to the explanatory diagram in FIG. Similarly to the above, the video signal input from the video input terminal (1) passes through the A/D converter (2), the frame memory unit (3), the data processor (4), and the transmission processor (5). , compression-encoded image data for transmission is output from the line output terminal (6). Furthermore, when a mode that transmits 1/2 of the screen is selected from the video mode selection input terminal (7), the vertical synchronization pulse input from the vertical synchronization input terminal (8) is sent to the vertical address counter (9).
), and this output is manually entered into the memory (10). This memory (10) has a central area (sixth
When an address other than that shown in the figure is input, a control signal that does not require output is output to the frame memory section (3). At this time, use the upper/lower setting input terminal (11) to set M lines (M is an integer) above the upper end of the center area to the upper/lower setting latch (12).
). This upper/lower setting latch (12) outputs the address information of the N-M main port by this input, and the initial value of the vertical address counter (9) becomes the address of the N-M main port, and this vertical address counter (9) ) starts counting 2N from N-M.

Therefore, the control signal output from the memory (10) to the frame memory unit (3) is transmitted in the area from the (N-M) main port to the (3N-M) main port of the screen, as shown in FIG. Memory output is possible, and image data is transmitted only in this area.

In the above embodiment, the vertical setting input terminal (11) is provided and only the vertical direction is controlled by the vertical address counter (9), but as shown in FIG. 3, the horizontal synchronization input terminal (13) , a horizontal address counter (14) may be provided, and the initial value of this horizontal address counter (14) may be changed using a left/right setting latch (16) from a left/right setting input terminal (15). In this example, the image data of the screen shown in FIG. 4 will be transmitted, and L can be set using the left and right setting input terminals (15) in the same manner as the vertical address setting control. The left and right positions of the central area where image information is transmitted can be freely changed. In addition, by changing the setting value M using the vertical setting terminal (11), the screen portion to be transmitted can be moved up, down, left and right as if the camera were attached to a rotating table. , the necessary image that is part of the screen can be properly transmitted. As described above, according to the present invention, as a result of inputting a displacement point as a base point by the setting latch, a transmission unnecessary portion is set around that base point,
Only a portion of the image centered around the base point will be transmitted.

[Effects of the Invention] As explained above, the present invention allows setting any basic area of the image data screen to be transmitted via the setting latch,
Since the control circuit transmits only the image for the surrounding setting mode and can move its basic position arbitrarily in the horizontal or vertical direction, it has the effect of properly transmitting only the necessary part of the screen.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the image transmission device of the present invention, FIG. 2 is an explanatory diagram of a transmitted image according to the embodiment of FIG. 1, and FIG. 3 is another embodiment of the image transmission device of the present invention. FIG. 4 is an explanatory diagram of a transmitted image according to the embodiment of FIG. 3, FIG. 5 is a block diagram of a conventional image transmission apparatus, and FIG. 6 is an explanatory diagram of a conventional transmitted image. In the figure, (1) is the video input terminal, (2) is the A/D
conversion section, (3) is frame memory section, (4) is data processing section, (5) is transmission processing section, (6) is line output terminal, (
7) is a video mode selection terminal, (8) is a vertical synchronization input terminal, (9) is a vertical address counter, (10) is a memory,
(11) is the vertical setting input terminal, (12) is the latch for vertical setting, (13) is the horizontal synchronization input terminal, (14) is the horizontal address counter, (15) is the left and right setting input terminal, (16)
) are latches for left and right settings. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent: Patent Attorney Masuo Oiwa (2 others) Jitsai Hoku Ikuri no Ji 2 Yo JShirt -68; Procedure amendment (voluntary) 1. Relationship of the case to the Indication Patent Application Case No. 1 Patent Applicant Residence Address: 2-2-3 Marunouchi, Chiyoda-ku, Tokyo Name (601) Mitsubishi Electric Co., Ltd. Representative Moriya Shiki 4, Agent address: 2-2-3-5 Marunouchi, Chiyoda-ku, Tokyo; Column for detailed description of the invention. 6. Details of amendments and above

Claims (1)

[Claims] an analog-to-digital converter for digitally converting a video input signal; a frame memory for storing the analog-to-digital converted signal; a data processing section for encoding data stored in the frame memory; a transmission processing unit that outputs the encoded data; a memory that outputs a control signal for a portion that does not require image output to the frame memory portion; and an address counter that outputs the portion that does not require image output to the memory in response to a video mode selection signal; An image transmission device comprising: a setting latch that outputs an image output displacement position signal to the address counter.