JPH03217177A - Display picture switching system - Google Patents

Abstract

PURPOSE:To use a mirror image picture for matching the position of a still picture or a document, etc., and to use a picture as it is for focusing a detailed part such as a character by switching the display of the picture photographed by a camera as it is and the display of the mirror image picture inverting the right and left sides. CONSTITUTION:When the display position of the picture displayed at a display part 7 is made eccentric to right or left or one part of the picture is missed, a mirror picture switching signal is inputted to a memory control part 5 and a read address to be inputted to a memory part 3 is changed. Then, the picture to be displayed at the display part 7 is formed to the mirror picture and for the picture, position matching or focusing is executed. When the position or the focal point becomes a desired one, the above mentioned mirror picture switching signal is inputted to the memory control part 5 and the displayed picture is switched to the picture as it is. Then, a fetch signal is inputted to the memory part 3 and a desired video signal is recorded and sent out through an encoder part 4 to a transmission line.

Description

[Detailed Description of the Invention] [Summary] With regard to a display screen switching method, the purpose of this invention is to enable the positioning and focusing of video signals to be easily performed without any discomfort, and to also allow character recognition to be performed normally. In a still image transmission device that shoots and transmits a desired video as a still image, the video signal is written and read using a write/read control signal and a write/read address signal, and the desired video is recorded as a still image according to the capture signal. and a memory control section that changes the read address to be outputted to the memory in response to a display image switching signal, and is configured to appropriately switch the video signal to be outputted.

[Industrial application field]

The present invention relates to a display screen switching method, and more particularly to a display screen switching method when a subject is set in the photographable area of a photographing device when transmitting still images during a videophone call or video conference.

When transmitting a desired video as a still image from among video signals being photographed, the captured video is first displayed on a monitor installed corresponding to the photographing device, and the desired video signal is selected.

[Conventional technology]

FIG. 7 shows a general configuration diagram of a conventional still image transmission device.

In the figure, first, an analog video signal is inputted by a photographing device 1. The input video signal is converted into a digital video signal by the A/D converter 2 and output to the memory 8.

In the memory 8, input digital video signals are written/read frame by frame. Here, the video signal read out at one frame interval is input to the D/A converter 6, converted to an analog signal, and displayed on a display device such as a monitor 7. The photographer (user) adjusts the position of the subject to the photographable area of the photographing device 1 and/or adjusts the focus of the photographing device 1 while viewing the video signal displayed on the monitor 7 . When the position of the subject is determined by the above-described operations, the desired image is recorded as a still image 3 according to the capture signal and is output to the encoder 4. The encoder 4 compresses the band of the input still image signal by encoding and then sends it to the transmission path.

[Problems to be Solved by the Invention] However, in the above-described still image transmission device, since the photographed image signal is output as is to a display device such as a monitor, a video signal with left and right sides reversed is displayed on the monitor. This will result in

In our private lives, we are used to looking at self-portraits in the mirror, so the alignment screen is also a mirror image screen (screen with left and right swapped).
It is easier to align the position. This is because when the right side of the subject is cut off on the screen, it is natural to try to move the subject to the left, and this is when the screen is mirrored. If you display it as is, you will have to move it to the right even though the right side is cut off, which is unnatural.

However, when using a mirror image screen, there is a problem that in the case of calligraphy and paintings, since they include characters and symbols, the characters and symbols are also flipped left and right, making it impossible to determine what is written even when looking at the image. be.

Therefore, it is an object of the present invention to enable the positioning and focusing of video signals to be easily performed without any discomfort, and to also enable character recognition to be performed normally.

[Means to solve the problem]

FIG. 1 shows a diagram of the principle of the present invention. In the figure, a video signal input from a photographing section 1 is converted into a digital video signal by an A/D conversion section 2 and output to a memory section 3. The memory unit 3 writes and reads the input digital video signal according to the write/read clock and write/read address input from the memory control unit 5. The video signal read here is input to the D/A converter 6, converted into an analog signal, and then displayed on the display section 7. Display section 7
If the display position of the image displayed on the screen is biased to the left or right or a part is missing, input a mirror image switching signal to the memory control unit 5, change the read address input to the memory unit 3, and change the display unit. The image displayed at 7 is a mirror image, the image is aligned and/or focused, and when the desired position and/or focus is achieved, the mirror image switching signal is input to the memory control unit 5 and the image is displayed. The system is configured to switch the video to the original video, input the captured signal to the memory section 3, record the desired video signal, and send it out to the transmission line via the encoder 4.

[Effect]

As described above, according to the present invention, the user can easily switch the video signal displayed on the display unit by appropriately switching the read address output by the memory control unit using the mirror image switching signal. Ta.

[Embodiment] FIG. 2 shows an embodiment of the main parts of the present invention, and FIG. 3 shows a time chart of each part in FIG. 2.

In the figure, the memory section 3 of FIG. 1 is replaced by the switch 31 of FIG.
Corresponding to the part consisting of memory A and memory B, the first
The memory control section 5 in the figure is the first address generation section 5 in FIG.
1, second address generation section 52, AND circuit 53. This corresponds to the part consisting of the selector 54. In the figure, the same reference numerals as in the conventional example are given. In the figure, first, the photographed video signal is digitized and then input to the switch 3l in the memory section 3. a). The switch 31 outputs the input video signal to the second memory 33. In the memory 33, the third write/read address (address where writing and reading are the same) from the first address generating section 51 in the memory control section 5 is used.
Writing and reading are performed sequentially according to FIG. 3(d) and the write/read switching signal FIG. 3(c). Here, the video signal output from the second memory 33 is converted into an analog signal and then displayed on a display unit such as a monitor. For example, if the displayed image is biased to the left or right of the monitor screen (including when the left or right screen of the image or either screen is cut off) or if the focus is shifted, the user may use the mirror image switching signal. 3(d) is input to the AND gate 53 in the memory controller 5 and the AND condition with the write/read switching signal (C) is taken, that is, when the mirror image switching signal is in the ON state, successive clocks are input. At this time, the selector 54 specifies only the read address to the second address generation section 52. By obtaining the read address from the second address generation section 52 set in this manner, the image displayed on the monitor becomes a mirror image. In this way, the image is aligned and/or focused while the mirror image is displayed on the monitor. When the desired position and/or focus is achieved, the mirror image switching signal is turned off to return the displayed video signal to a normal video. Here, the input signal (e) is sent to the switch 31 of the memory section 3.
and outputs one frame worth of video signal to the first memory 32 as a still image signal. In the first memory 32, a write switching signal (C
) and the write address (d), read out using the read switching signal (C) and the read address (d), and after band compression is performed by encoding, it is sent to the transmission path.

8. The first address generating section 5l and the second address generating section 52 described here are composed of a line counter 511 and a pel counter 512, as shown in FIG.

The bell counter 511 counts the number of pixels in one line,
The line counter is enabled by the RC signal of the bell counter and counts the number of lines on the screen. For example, horizontal 480
Pixel. Taking a monitor with a 240-pixel screen as an example,
When counting lines, a 9-bit counter is required, and a counter that counts vertical lines is an 8-bit counter. That is, as shown in FIG. 5, a combination address is created such that the value counted by the line counter 511 is at the top and the value counted by the pel counter 512 is at the bottom.

Here, the first address generating section 51 uses an asip counter as a bell counter and a line counter, and the second address generating section 52 uses an up counter as a bell counter and a down counter as a line counter. That is, as shown in FIG. 6, the first address generating section 51 generates addresses scanning from left to right, and the second address generating section 52
Now generate addresses by scanning from right to left.

〔Effect of the invention〕

Since it is possible to switch between displaying the screen projected by the camera as it is, and a mirror image screen with the left and right reversed, the mirror image screen can be used to adjust the position of still images, documents, etc., and can be used to focus on fine details such as text. It becomes possible to use the same screen as is.

Therefore, positioning and focusing can be performed with more natural operations. Furthermore, the monitor screen can be selected according to the user's purpose.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the principle configuration of the present invention, Fig. 2 is an embodiment of the main part of the present invention, Fig. 3 is a diagram showing signals in each part of Fig. 2, and Fig. 4 is a diagram showing the signals in each part of Fig. 2. A detailed diagram of the address generation unit. Figure 5 is a diagram showing the creation of the address in Figure 4. Figure 6 is a diagram showing the scanning direction according to the successive addresses in Figure 4. Figure 7 is a diagram showing the conventional still image transmission. In the general configuration diagram and diagram of the device, I... Photographing section 2... A/D conversion section 3...
-Memory section 4...Encoding section 5...Memory control section 6...D/A conversion section 7...Display section
8...Memory 31...Switcher 32...
First memory 33...Second memory 51...First address generator 5'2...Second address generator 53...AND gate 54...Select 511...Line Counter 512 shows a pel counter. -O-Q

Claims (1)

[Scope of Claims] In a still image transmission device that shoots a video signal and transmits the desired video as a still image, the video signal is written and read by a write/read control signal and a write/read address signal, and a capture signal is transmitted. a memory unit (3) that records a desired video as a still image according to the display image switching signal; and a memory control unit (5) that changes the read address output to the memory (3) according to a display image switching signal.
A display screen switching method characterized in that the video signal to be output is appropriately switched.