JPH01126080A - Image displaying method - Google Patents

Abstract

PURPOSE:To enable the natural display of an image like seeing a mirror to be executed by inverting the both side of the image of its own station and displaying it on the image display device of its own station. CONSTITUTION:An image signal from the camera of its own station side is supplied to an encoder 2 and simultaneously supplied to a memory 1. A luminance signal and a chrominance signal stored in this memory 1 are read in an inversed order which they are stored and the luminance signal and the chrominance signal of which both sides are inverted are generated. This both sides inverted luminance signal and chrominance signal are supplied to the image display device of its own station as a both sides inverted color signal.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for displaying an image output from a camera on the own side on an image display device on the own side in an image communication system.

(Prior Art) In an image communication system using an image communication device that is equipped with an image input device and an image display device and separates and encodes a luminance signal and a color signal, before communication, the camera output from the local station is By displaying the image on your own image display device,
The caller takes care of his or her personal appearance and organizes things that appear in the background. In this case, conventionally, as shown in FIG. 2, an image display method has been commonly used in which the image is displayed on the image display device of the own station in the same way as it is displayed on the image display device of the other station.

(Problems to be Solved by the Invention) However, in the conventional image display method in which the image output from the camera on the own side is displayed on the image display device on the own side as shown in FIG. The displayed image appears to move in the opposite direction to the left and right in response to the movement, which creates a sense of discomfort and makes movements awkward. Conventional image display methods have such problems.

An object of the present invention is to display an image output from a camera on the own side to an image display device on the own side, so that the displayed image moves in the same direction as the user, so that the image is displayed naturally and without discomfort, as if looking in a mirror. The objective is to provide an ergonomically superior display method.

(Means for solving the problem) According to the present invention, an image input device and an image display device are provided,
In an image communication system using an image communication device that separates and encodes a luminance signal and a color signal, a method for displaying an image output from a camera on the own side on an image display device on the own side, the method comprising:
Separating the color signal of the self-side camera output image into a luminance signal, storing both of these signals in storage means, and storing both of the signals stored in the storage means for each horizontal scanning line segment. A left-right reversed color signal is obtained from the left-right reversed brightness signal and the color signal, and the left-right reversed color signal is sent to the own-side image display device. An image display method is obtained which is characterized by displaying.

(Function) In the image display method of the present invention, in an image communication system using an image communication device that includes an image input device and an image display device and separates and encodes a luminance signal and a color signal, an image output from a camera on the local side is used. When displaying a color signal on the image display device of the own station, the image of the own station is horizontally reversed and displayed on the image display device of the own station, so that the color signal is displayed as seen from the image communication device user as shown in Figure 1. It is possible to match the displayed image of the user's own station with the user's own left and right orientation and direction of movement, and it is possible to obtain a natural and natural display image as if looking in a mirror.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

An embodiment in which the luminance signal and color signal of the input image signal are time-axis multiplexed will be described below.

Time axis multiplexing is a method of compressing a plurality of signals in the time direction and arranging the signals in a certain order to realize multiplexing of signals. The most common method for television signals is to perform temporal compression by utilizing the fact that the band of the chrominance signal is narrower than that of the luminance signal, and to embed the signal into the horizontal blanking period of the luminance signal. FIG. 8 is a waveform diagram showing an example of a television signal in which color signals Ct and Ct are embedded in the horizontal blanking period of a luminance signal. FIG. 3 shows an image communication apparatus to which the first embodiment of the present invention is applied. FIG. In this image communication device, an image signal from a camera on the local side is supplied to the encoder 2 via a line 201 and also to the memory 1. Here, it is assumed that the signal supplied via the line 201 is digitized, and is in a format in which a luminance signal and a color signal are multiplexed on the time axis.

The memory 1 has a configuration as shown in FIG. 5, for example.

That is, in the color signal separation circuit 11, the time axis multiplexed image C signal supplied through the line 101 is
Luminance signal and color signal, e.g. Y, CI.

It is separated into C2. These separated signals are connected to line 11
1, line 112, and line 113 to line memory 14, line memory 15, and line memory 16, respectively.

The synchronization detection circuit 13 detects the timing of the synchronization signal from the image signal supplied via the line 101, and supplies a signal indicating the beginning of the scanning line to the line memory 14, line memory 15, and line memory 16 via the line 131. do.

line memory 14, line memory 15, line memory 1
6 are the luminance signal (Y) and color signal (C5°C,), respectively.
is stored in units of one scanning line. Furthermore, this can be easily achieved by providing each with a capacity for two scanning lines and using each scanning line by switching between reading and writing.

In each line memory, the supplied Y.

The CI and C2 signals are written in chronological order as shown in FIG. 7, and then read out in the reverse order of writing.

This operation is performed in accordance with a signal provided by line 131 indicating the beginning of a scan line.

As a result, the supplied signal is inverted in the time direction in units of one scanning line and is output. In other words, the left and right sides of the image are reversed.

The horizontally inverted Y thus obtained.

The signals C7 and C2 are connected to lines 141, 151, and 151, respectively.
It is supplied to the color signal multiplexing circuit 12 via line 161.

The color signal multiplexing circuit 12 time-base multiplexes the supplied luminance signal and chrominance signal and supplies them to the switch 4 in FIG. 3 via a line 102.

The encoder 2 performs predetermined encoding on the supplied image signal and transmits the encoded image signal to the other station via the line 202.

The decoder 3 decodes the encoded image signal transmitted from the partner station via the line 301 into an image signal, and supplies the image signal to the switch 4 via the line 302.

When displaying the own camera output image, the switch 4 selects
An image signal obtained by horizontally inverting the camera output of the local station supplied from the memory 1 is selected, and in normal times, a decoded image signal of the other station supplied from the decoder 3 is selected and transmitted to the local station via the line 401. to the side image display device. At this time, of course,
If it is converted into a composite color signal such as a normal NTSC color signal, it can be displayed on a normal television receiver. if,
If the TV receiver can display with RGB input, RGB
By inserting a converter in between, conversion to NTSC is not necessary.

Next, an embodiment will be described with reference to FIG. 4 in which the input image signal is separated from the beginning into a luminance signal and a color signal, for example, Y, CI, and C-2.

FIG. 4 is a block diagram showing an image communication apparatus to which a second embodiment of the present invention is applied. In this image communication device, the image signal from the camera output on the local side is separated into a luminance signal and a color signal, and the line 201-1, line 201-2,
Line 201-3 supplies encoder 2b and memory 1b.

As shown in FIG. 6, the memory 1b has a configuration in which the color signal separation circuit 11 and the color signal multiplexing circuit 12 are removed from the configuration shown in FIG. According to the signals, the luminance signals and color signals provided by lines 201-1, 201-2, and 201-3 are horizontally inverted to produce lines 102-1, 102-2, and 102.
-3 to the switch 4b. Note that, including the case where the synchronization signals are supplied separately, the timing of the synchronization signals may be detected outside the memory 1b, and a signal indicating the beginning of the scanning line may be supplied to the memory 1b from the outside.

The encoder 2b and decoder 3b in FIG. 4 are only in a format in which the luminance signal and chrominance signal of the input and output signals are separated, respectively, and are functionally the same as the encoder 2 and decoder 3 in FIG. are equivalent.

When displaying the camera output of the own station, the switch 4b
An image signal obtained by horizontally inverting the camera output of the local station supplied from the memory 1b is selected, and normally, the decoded image signal of the other station supplied from the decoder 3b is selected and the image display device of the local station is displayed. supply to.

However, here, it is assumed that the switch 4b has three circuits that select and output one signal out of two signals, and these three circuits can be switched at the same time.

Furthermore, if the encoding device of the image communication device has a frame memory for a method such as an interframe prediction method, and the same locally decoded image as the image decoded on the receiving side is stored therein,
Instead of supplying the image signal from the local camera to the memory 1 via the line 101 in FIG. 3, it may be supplied from a frame memory that stores this locally decoded signal. While the output image is only displayed horizontally reversed, the image displayed in this case is a horizontally reversed image of the image obtained by decoding at the receiver.

In addition, in this case, an effect can be obtained in that it becomes easier for the transmitting side to produce effects so as to minimize the deterioration of the image obtained by decoding on the receiving side.

(Effects of the Invention) As explained in detail above, the output image of the local camera displayed on the local image display device by the method of the present invention makes it appear as if the device user is looking in a mirror. It looks natural and there is no discomfort in the orientation and direction of movement. Therefore, by displaying images using the method of the present invention, it is possible to perform actions such as preparing one's appearance before communication without feeling as uncomfortable as if one were doing it in front of a mirror on the back deck, greatly improving work efficiency. can do.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram showing an image display method of the present invention, FIG. 2 is a conceptual diagram showing a conventional image display method, and FIG. 3 is a block diagram showing an image communication device to which an embodiment of the present invention is applied. Fourth
5 is a detailed block diagram of the memory 1 in FIG. 3, and FIG. 6 is a detailed block diagram of the memory 1b in FIG. 4. , FIG. 7 is a conceptual diagram showing the order of writing and reading performed in the line memory in FIGS. 5 and 6,
FIG. 8 is a waveform diagram showing an example of a television signal in which color signals C1 and C1 are embedded in the horizontal blanking period of a luminance signal. 1.1b...Memory, 2.2b...Encoder, 3゜3
b...Decoder, 4, 4b...Switcher, 11...Color signal separation circuit, 12...Color signal time axis multiplexing circuit, 1
3...Synchronization signal detection circuit, 14.15.16...Line memory.

Claims (1)

[Claims] In an image communication system that uses an image communication device that is equipped with an image input device and an image display device and separates and encodes a luminance signal and a color signal, the image output from the camera on the local side is displayed on the image display device on the local side. The method includes separating the color T signal of the camera output image from the local station into a luminance signal and a color signal, storing both of these signals in a storage means, and storing the two signals stored in the storage means. A horizontally inverted luminance signal and a color signal are generated by reading out the signals for each horizontal scanning line segment in the reverse order of storage, and a horizontally inverted color signal is obtained from the horizontally inverted luminance signal and color signal, and An image display method characterized by displaying the horizontally inverted color signal on a station-side image display device.