JPS6326090A - Picture transmission system using excess period - Google Patents

Abstract

PURPOSE:To effectively use an excess time by transmitting other information in the information transmission time of a still picture in divided pictures. CONSTITUTION:In a transmission side, the picture 1 is defined to be 528 divided pictures 2 and in a receiving side, 'a movement detection' to be executed is instructed. An enlargement block control signal is added to a present block control signal. In the block of a completely still area, any other information is inserted into the block and transmitted. For instance, in the time for transmitting the picture of the completely still area, completely separate information such as a still picture news, a weather forecasting, an envoro environment video is inserted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transmission system in which, in image transmission, other information can be transmitted in place of the still image during the time for transmitting the still image.

[Prior art]

When looking at a television screen, all pixels on both sides do not change uniformly, depending on the type of image, but can be divided into static parts and changing parts. Nowadays, with the development of digital technology, it is possible to store all the information of one screen in the frame memory, so there is no need to transmit parts that have not changed from the previous screen, but only those that have changed. All you have to do is update the display. Furthermore, compression of the transmission band is currently the most important issue, and if the same screen exists between adjacent frames, the band can be compressed by stopping the transmission of that part.

(Object of the Invention) An object of the invention is to enable surplus time regarding images that do not change from the previous screen and do not need to be transmitted to be used for transmitting other information. [Arrangement of the Invention] For this reason. The present invention provides an image transmission method in which a block control signal is transmitted for the movement and status of each divided screen into which a uniform screen is divided into a plurality of parts, and the image information is updated only for the moving divided screen on the receiving side. The configuration is such that other information is transmitted during the information transmission time for a still screen in the split screen.

〔Example〕

Examples of the present invention will be described below. NHK's MU
In the SE method, the time axis of the image is compressed using 4 fields, so when performing "motion detection" on the receiving side,
This cannot be done simply by comparing with the previous frame. Therefore, as shown in FIG. 1, the transmitting side divides the screen 1 into 528 divided screens 2, and instructs the receiving side what kind of "motion detection" should be performed. In FIG. 1, the size of both divided surfaces is expressed in pixels.

The block control signal is provided during the vertical blanking period, and has one bit per block, with a total word length of 528 bits.

This block control signal is 2. Frame difference, 'IJ' is used together with pseudo 1 frame difference.

Therefore, in this embodiment, in addition to the current pro-processor control signal, an enlarged block control signal is added.
The total word length is increased by 1056 bits. There is no practical problem with this word length. Note that it will actually be a little longer because the remarity bit will be included.

□ Then, as shown in the table below, the state is set so that for blocks in completely still areas, some other information is inserted into the blocks and transmitted.

In reality, it is expected that noise will be mixed in during transmission, causing problems such as the still image becoming corrupted, so block control information may be transmitted using expanded Hamming codes, etc.
Although it is necessary to increase the accuracy of information, this is sufficiently possible since the block control signal is 1056 bits. Furthermore, regarding intra-block information, if incorrect information is received, then that information will be output, so it is necessary to correct it as appropriate on the transmitting side.

This will be explained below using a specific example. First, the point of interpolating information of blocks that are likely to have many moving areas will be explained.

Here, a block considered to be appropriate based on the current frame information existing on the transmitting side is inserted into the block of this still image to improve the characteristics of the moving area.

This is shown in Figures 2 to 44.

FIG. 2 shows the simplest method for determining whether to interpolate other misaligned blocks when a completely stationary region exists. For example, the block 22 in the motion region next to the block 21 in the completely still region is interpolated easily. In this method, around the completely stationary area (irrespective of the scanning direction)
Since it seems that there are more static regions than dynamic regions,
If the transmission offset amount (reference value for determining a completely still area) is not changed, the transmission efficiency will deteriorate. However, the scale of the equipment on the receiving side is reduced.

FIG. 3 is an example using human visual characteristics.

That is, the peripheral part 11 of the screen 1 having poor visual characteristics is made to correspond one-to-one with the central part 12 in advance, and the peripheral part 11
In this method, when there is a block 23 in a completely still area, the time for image transmission of the block 23 is used for image information transmission of the block 24 in the central part 12, and the time is interpolated to the central part 12. be. Thereby, the image of the central portion 12, which has good visual characteristics, can be displayed more precisely.

FIG. 4 shows a method useful when there is an important target object on the screen. When a small bird crosses the background of a static image, the human eye follows the bird, not the background.

However, the above-mentioned MUSE method corresponds to this by treating the chair and background as completely still areas, and the small bird as a moving area. In order to compensate for this, the x and y coordinates of one or more moving objects are transmitted during the blanking interval, and the time used to transmit the image of the block 25 of the surrounding completely still area is
Used for image transmission of the region 26 of the part where the moving object is present,
This allows for interpolation.

FIG. 5 shows a method different from the above-described method in which completely different information such as still image news, weather forecast, environmental video, etc. is inserted into the time for image transmission in a completely still area. This allows the receiving device 3 to have a new frame memory for this completely still area, and allows the viewer to use normal M
It can be configured so that either USE broadcast or still images during the surplus period can be selected. In Figure 5, 31 is MUS
Frame memory 32 and 32' for E images are memories for still image news. Further, 33 and 34 are switches that move in reverse to alternately write data into or read data from the frame memory 32 or 32', 35 is a switch that selects still image news or MUSE image;
6 is a circuit for inputting and processing a television signal, and 37 is a television signal input section.

〔Effect of the invention〕

As described above, the present invention utilizes the information transmission time regarding blocks of still images for other information transmission.
It is possible to make effective use of surplus time.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of motion detection by screen blocking, Figure 2
The figure is an explanatory diagram of expanding the transmission band of image information in the moving area.
Figure 3 is an illustration of expanding the transmission band for image information in the center of the screen, Figure 4 is an illustration of determining the area of a moving object and interpolation, and Figure 5 is an explanation of transmitting other information. It is a diagram. 1... Screen, 2... Block, 21.23.25.
... Complete still image area block, 22.24... Video area block, 26... Video area, 3... Receiving side device, 31... Frame memory for MUSE image, 3
2.32'...Memory for still image news, 33.34
．． 35... Switch, 36... Input processing circuit, 37
...Input section. Agent Patent Attorney Tsuneaki Nagao Figure 1 Figure 2 Figure 3 32'

Claims (4)

[Claims] (1) In an image transmission method in which a block control signal is transmitted regarding the movement of each divided screen in which the screen is divided into multiple parts, and the image information is displayed and updated only for the moving divided screen on the receiving side, the divided screen An image transmission method characterized in that other information is transmitted during the information transmission time for a still screen. (2) The image transmission method according to claim 1, wherein the other information is information regarding a moving image screen. (3) The image transmission system according to claim 1, wherein the other information is information regarding the center of the screen. (4) The image transmission system according to claim 1, wherein the other information is other display information unrelated to the screen.