JPH0435392A - Color signal transmission system - Google Patents

Abstract

PURPOSE:To allow a receiver side to observe a displayed picture easily without increase in a picture memory by sending a color difference signal early from a transmitter, sending a luminance signal later, converting the signal into a video signal in the order of the reception at the receiver and displaying the video signal. CONSTITUTION:A picture fetched from a television camera TV is subjected to processing of A/D conversion in a video signal input section 11 and digital data of a luminance signal (Y) and color difference signals (R-Y), (B-Y) are stored in a frame memory 12. A data processing section 13 applies data compression in the order of the color difference signals (R-Y), (B-Y) and the luminance signal (Y) and the result is sent to a communication line 3 sequentially by a communication control section 14. Then a data received by a communication control section 21 is fed to a data processing section 22, in which data expansion processing is implemented. The data is sequentially written in a frame memory 23, a video signal is generated from a video signal output section 24, a picture is displayed on a monitor television receiver MT.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color image transmission method for transmitting image data using a communication line.

[Prior Art] Conventionally, for example, when transmitting a color image taken with a television camera or the like as image data consisting of a luminance signal and a color difference signal using a communication line such as a telephone line, the transmitting side first transmits the luminance. The signal is encoded in the order of the color difference signal, and the encoded data is transmitted, and on the receiving side, the received data is sequentially decoded and displayed. Here, two types of color difference signals are generally used: (RY) and (B-Y), which are obtained by subtracting the luminance signal (Y) from the red (R) and blue (B) primary color signals. has been done.

[Problem to be solved by the invention]

When transmitting images one after another, two color difference signals from the previous screen remain on the receiving side's display device, such as a monitor TV, while the luminance signal (Y) is displayed, and the next 1st
While displaying the second color difference signal (for example, (RY)), the second color difference signal (B-Y) of the previous screen remains. In other words, while the luminance signal and the first color difference signal are displayed, some signal from the previous screen remains, and the displayed image will not be correct and will be difficult to see. There was a problem.

Another method for displaying images is to have an image memory for two display areas on the receiving side so that they can be displayed by switching between them, and when decoding the luminance signal and color difference signal, the image memory that is not currently displayed is displayed. There is a method that writes data to the image memory of the image, receives all the luminance signals and color difference signals, and switches to display when the decoding is completed.

This method does not make the images difficult to view, but it requires two image memories, and the communication line is slow, making it difficult to view the images.
It takes a considerable amount of time to transmit several images (several tens of seconds to several minutes)
When this is required, there is a problem in that the display does not change easily and gives a feeling of anxiety to the person looking at the screen.

The present invention has been made in view of the above points, and its purpose is to
An object of the present invention is to provide a color image transmission system that allows images displayed on a receiving side to be easily viewed.

[Means to solve the problem]

The color image transmission system of the present invention includes a transmitter that converts a video signal captured from an imaging device such as a television camera into image data consisting of a luminance signal and a color difference signal, and sequentially outputs the image data to a communication line; It consists of a receiver that captures image data consisting of a luminance signal and a color difference signal transmitted through a communication line and sequentially converts it into a video signal, and displays the video signal obtained by the receiver on a display means such as a monitor television. The color image transmission system for display is characterized in that the image data sent from the transmitter is sent out in the order of a color difference signal and a luminance signal.

[Effect]

In the color image transmission system of the present invention, the luminance signal (
The amount of data for the color difference signals (R-Y) and (B-Y) is smaller than that of the color difference signals (R-Y) and (B-Y). This method focuses on the short time required for data transmission in Y), and when transmitting image data from a transmitter, the color difference signal, which takes a short transmission time, is sent out first, and then the luminance signal, which takes a long transmission time, is sent out. At the transmitter and receiver, the images are converted to video signals and displayed in the order in which they are received, so that the time it takes for correct images to be displayed is longer than the time it takes for incorrect images to be displayed. It is something.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings. 1st
The figure is a schematic configuration diagram showing an image transmission system according to the present invention, in which a transmitting side and a receiving side are connected by a communication line 3. The transmitting side consists of a TV camera TC and a transmitter 1.
The receiving side consists of a receiver [12] and a monitor television MT.

The transmitter 1 includes a video signal input section 11 that inputs a video signal from a television camera TC and performs A/D conversion, etc., and a luminance signal (Y) and a color difference signal (R-) output from the video signal input section 11. A frame memory 12 that stores the image data of Y) and (B-Y), a data processing unit 13 that compresses the image data of the frame memory 2, and sends the compressed image data in the data processing unit 13 to the communication line 3. and a communication control section 14.

The receiver 2 includes a communication control section 21 that receives image data transmitted via the communication line 3, a data processing section 22 that decompresses the data received by the communication control section 21, and a data processing section 22 that decompresses the data received by the communication control section 21. luminance signal (Y) and color difference signal (RY).

It consists of a frame memory 23 that stores data of (B-Y), and a video signal output section 24 that performs D/A conversion on the data in the frame memory 23 and outputs a video signal to the monitor television MT.

Next, the operation of this embodiment will be explained using FIG. 2. The transmitter 1 first captures an image from the television camera TC. The captured image undergoes processing such as A/D conversion in the video signal input section 11, and the digital data of the luminance signal (Y), color difference signal (RY), and (B-Y) is stored in the frame memory 12. It will be done.

In the data processing section 13, the color difference signal (RY) is processed.

Data compression is performed in the order of (B-Y) and the luminance signal (Y), and when the compression process is completed, the data is sequentially sent to the communication line 3 by the communication control unit 14.

In the receiver 2, the data received by the communication control section 21 is sent to the data processing section 22, and the data processing section 22 performs data decompression processing. The decompressed data is sequentially written into the frame memory 23, a video signal is generated by the video signal output section 24, and the image is displayed on the monitor television MT.

Here, from the transmitter 1, a color difference signal (RY) (B-Y
) and the luminance signal (Y), the images are also displayed on the receiving side monitor television MT in this order.

Generally, compared to the luminance signal (Y), the color difference signal (R-Y)
, (BY) has a small amount of data. Therefore, the luminance signal (
The time required for data transmission of the color difference signal (R
-Y) and (B-Y) data transmission time is short.

Now, the data transmission time of color difference signal (RY), (B-Y) is j+, tz (t+ = tz = 1 second), luminance signal (
Considering the case where the transmission time of Y) is t3 (ts = 10 seconds) and images are captured and transmitted one after another by the transmitter 1, the image displayed on the monitor TV MT on the receiving side is first The color difference signal (RY) is displayed, but
During this time, the luminance signal (Y) and color difference signal (B-Y
) remains, so it is not a correct image. Next, the color difference signal (B-Y) is displayed, but during this time, the luminance signal (Y) of the previous image remains, so it is not a correct image. Finally, the correct image will be displayed only when the luminance signal is displayed. Here, the time during which the first color difference signal (R-Y) is displayed and the time during which the second color difference signal (B-Y) is displayed are tl and tz, respectively.
The last luminance signal (Y) is displayed (the time is t), which is as short as
+ ts ) = 10/12 = approximately 0.83) can be made large, making the image displayed on the monitor television MT very easy to see.

In this embodiment, in the transmitter 1, the color difference signal (R
-Y), color difference signal (B-Y), and luminance signal (Y), but the color difference signal (B-Y), color difference signal (R-Y), and luminance signal (Y) are processed in this order. It may also be processed by

[Effects of the Invention] As described above, according to the color image transmission method of the present invention, when transmitting reimage data from the transmitter, the color difference signal with a short transmission time is transmitted first, and then the color difference signal with a long transmission time is transmitted. By transmitting luminance signals and converting them into video signals and displaying them at the receiver in the order in which they are received, the time it takes for correct images to be displayed is longer than the time it takes for incorrect images to be displayed. This makes it possible to provide a color image transmission system that allows images displayed on the receiving side to be easily viewed without increasing the image memory.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of a color image transmission device according to an embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation of the same. C Transmitter Communication Line Frame Memory Communication Control Unit Data Processing Unit/Video Signal Output Unit/TV Camera MT 13/Receiver Video Signal Input Unit Data Processing Unit Communication Control Unit Frame Memory Monitor TV

Claims (1)

[Claims] (1) A transmitter that converts a video signal captured from an imaging device such as a television camera into image data consisting of a luminance signal and a color difference signal, and sequentially outputs it to a communication line; and a transmitter that outputs the data from the transmitter and transmits it over the communication line. It consists of a receiver that captures image data consisting of a luminance signal and a color difference signal and sequentially converts it into a video signal, and the video signal obtained by the receiver is displayed on a display means such as a monitor TV. A color image transmission method characterized in that image data sent from a transmitter is sent out in the order of a color difference signal and a luminance signal.