JPH05153487A - Video display left right inverting device - Google Patents

Abstract

PURPOSE:To display the same virtual image as being formed on a mirror by eliminating unnaturality of a monitor picture in which a real image whose left/right directions are inverted. CONSTITUTION:The device is provided with a 2-line bugger 3 having a capacity of two scanning lines, a writer 2 writing video data to the 2-line buffer 3, a write position controller 4 controlling a pointer of the writer 2, a reader 5 reading video data from the 2-line buffer 3 and a read position controller 6 controlling the pointer of the reader 5 and the write and the read of the video data to/from each scanning line of the 2-line buffer 3 are implemented alternately.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for displaying an image projected by a moving image camera by horizontally reversing it on a monitor image.

[0002]

2. Description of the Related Art In videophones and TV studios, one's face and appearance are often monitored. Then, when there is a moving image camera in front of oneself, the monitor image is represented by a real image.

[0003]

However, the faces and figures that we are usually used to see are virtual images reflected in a mirror, and are left and right reversed from the real images. Therefore, when the monitor image is viewed, there is no problem functionally, but a very unnatural impression is given. For example, when you move your right hand, you may fall into the illusion that you are moving your left hand even though it is your own image.

It is an object of the present invention to provide a device capable of eliminating such an unnaturalness of a monitor image and displaying a virtual image similar to that when reflected on a mirror.

[0005]

In order to achieve the above object, the present invention provides a two-line buffer having a capacity of two scanning lines, and a writing device for writing video data in the two-line buffer. The writing position control device that controls the pointer position of the writing device, the reading device that reads the video data from the two-line buffer, and the reading position control device that controls the pointer position of the reading device, the two lines An image display horizontal inversion device was used in which the writing operation and the reading operation of the video data to each scanning line of the buffer were alternately performed.

[0006]

In the present invention by the above-mentioned technical means, the two-line buffer having the capacity of two scanning lines can simultaneously write and read the video data. When writing the video data, for example, if the pointer position of the writing device is controlled by the writing position control device so that the image is horizontally flipped, the video data from the video camera is always horizontally flipped in the 2-line buffer. And then input. On the other hand, the image data in the left-right inverted state is instantaneously read out by the position control of the pointer by the read-out position control device, and this can be finally displayed on a monitor as an image similar to a mirror through an image memory or the like. To work.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In FIG. 1, 1 is an AD converter for converting an analog video signal from a video camera into a digital signal, and 2 is a scanning line. 2 line buffer 3 with capacity for 2 lines
Writing device for writing data to
The writing position control device controls the position of the pointer of the writing device 2 in synchronization with the D converter 1. Reference numeral 5 is a reading device for reading the data in the 2-line buffer 3, and its pointer position is controlled by the reading position control device 6. Further, 7 is an image memory for writing the read data, and 8 is a DA converter for converting a digital signal into an analog signal.

Reference numeral 9 in the drawing denotes the AD converter 1, the write position control device 4, the read position control device 6 and the DA.
A clock generator that sends a clock signal to each converter 8.

Next, the outline of the operation of the apparatus of the above embodiment will be described. First, the analog video signal from the moving picture camera is converted into a digital signal by the AD converter 1. The output of the AD converter 1 is sent to the writing device 2,
Further, by the control signal from the writing position control device 4,
It is input to a predetermined write position in the 2-line buffer 4. Then, the reading device 5 receives the control signal from the reading control device 6 and reads the data from a predetermined position in the two-line buffer 4. The read data is once written in the image memory 7, and then converted again into an analog signal by the DA converter.

The two-line buffer 3 is a memory having a capacity of two scanning lines. For example, as shown in FIG. 2, scanning lines A and B are provided, and each of these memories is
2, 3 to N, the respective pointer positions are A
(I) and B (j). For example, “A (3)” means the third memory of scan line A. Since the two-line buffer has a capacity of two scanning lines, it is possible to write and read data at the same time. This writing and reading method is as shown in the flowchart shown in FIG. This will be described below. The float chart is roughly divided into three parts. First, Part I is the initial setting, and only the writing operation to the scanning line B is performed. Part II performs a read operation from the scan line B and a write operation to the scan line A. Further, in Part III, contrary to Part II, the reading operation from the scanning line A and the writing operation to the scanning line B are performed. Part I is an operation that is performed only once at the start of operation, and when a steady state is reached, Part II and Part III are repeated. That is, while the scanning lines A and B are performing a data writing operation on one side, a reading operation is performed on the other side,
Then, the write and read operations are alternately switched. By performing such an operation, writing and reading can be performed at the same time.

In order to display the same image when the image from the video camera is inverted and finally reflected on the monitor in the mirror,
For example, when the video signal is written in the two-line buffer 3, the writing position control device 4 performs a writing operation in which the pointer position of the writing device 2 is inverted horizontally. As a result, the left-right inverted video data is read from the reading device 5 via the reading control device 6 into the image memory 7.
, And finally the left-right inverted video signal is sent to the monitor for display.

[0012]

According to the present invention, a device having a capacity of two scanning lines is used.
The line buffer is configured to write and read video data alternately at the same time. When writing video data, the writing position control device allows the video data to be input by reversing left and right, while controlling the read position when reading this. It can be performed instantaneously by the device. Therefore, according to the device of the present invention, the image displayed by the moving image camera is always controlled to be rotated in the left-right direction, and when the image is reflected in the mirror, the same image is immediately displayed on the monitor. Therefore, in a videophone, a television studio, or the like, the user has a special advantage that the monitor image can be viewed with a natural impression.

[Brief description of drawings]

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

FIG. 2 is an explanatory diagram showing a format of a 2-line buffer.

FIG. 3 is a flowchart showing video data write / read control in a two-line buffer.

[Explanation of symbols]

 2 writing device 3 2 line buffer 4 writing control device 5 reading device 6 reading control device

Claims (1)

[Claims] 1. A two-line buffer having a capacity of two scanning lines, a writing device for writing video data to the two-line buffer, a writing position control device for controlling a pointer position of the writing device, and A reading device for reading the video data from the two-line buffer and a reading position control device for controlling the pointer position of the reading device are provided, and the writing operation and the reading operation of the video data to each scanning line of the two-line buffer are performed. An image display left / right reversing device, which is characterized by being performed alternately.