JPH02213290A - Static image data transmitting method - Google Patents

Abstract

PURPOSE: To exactly transmit picture data necessary for the reproduction of a picture at the time of transmitting the picture data of static pictures divided into plural parts for each block unit by transmitting the picture data to be transmitted at first and at last for each block unit so as to be overlapped plural times. CONSTITUTION: For example, when a difference between the luminance of picture data at the right edge of the first line and the luminance of picture data at the left edge of the second line is large, a first line settling pulse S2 9 and a second line settling pulse S1 8 are mutually affected and those signal waveforms are distorted. However, the luminance difference between the picture data at the end of the first line and the first line settling pulse S2 9 is sufficiently smaller than the luminance difference between the picture data at the head of the first line and the picture data at the head of the second line. Therefore, the picture data at the end of the first line can not be distorted. In the same way, the second line settling pulse S1 is distorted, and the distortion of the picture data at the head of the second line can be prevented. In the same way, the distortion of the first and last picture data of each line can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image data transmission system for a device that handles still images, such as a still image video telephone, and particularly to prevention of image data distortion.

[Conventional technology]

This type of conventional still image data transmission system is shown in, for example, TV Technology September 1988 issue, pages 19 to 927, and FIG. 3 is an explanatory diagram showing the signal sending order of this still image data transmission system. .

In FIG. 3, (1) is a dual tone, (2) is a pause period indicating a no-signal state, (3) is a control information signal, (
4) is an image data signal. This image data signal (4
) is a signal obtained by sequentially scanning image data corresponding to each pixel constituting an image from the left end to the right end for each row. For example, if a still image is composed of 16,000 pixels in 100 rows in the vertical direction and 160 columns in the horizontal direction as shown in Figure 4, the numbers shown in Figure 4 The image data of each pixel is sequentially scanned, and an image data signal (4) is constructed from signals corresponding to each image data. At this time, for example, in the case of a monochrome image, the image data signal (4) is formed by a signal indicating the brightness of each pixel, that is, the gradation from white to black, in two phases and eight levels of amplitude. As shown in Figure 5, black has the maximum amplitude of the first phase, and the amplitude decreases toward the middle tones.
This is a signal in which the phase changes to the second phase in the middle, and the amplitude increases again to reach the maximum amplitude in white.

In such conventional image data transmission systems, after a dual tone (1) is sent to the telephone line, a pause (
There is a period with no signal called 2), after which the receiving side receives a control information signal (
3) is sent, and then an image data signal (4) is sent. The image data signal (4) is composed of signals corresponding to the image data arranged in the numerical order shown in FIG. The eye brightness signal (5) is sent out in the order of the second row brightness signal (6), and thereafter is sent out continuously up to the last row brightness signal (7). That is, the 161st image data is sent out following the 160th image data in FIG.

[Problem to be solved by the invention]

Since the conventional still image data transmission method was as described above, the image data at the left end of the still image and the right end of the next row are transmitted consecutively, but - Although the correlation between image data between pixels is high and the image data signals are close, the correlation between distant pixels such as at both ends of the image is low, and the signal waveforms are significantly different due to large differences in brightness or color. Therefore, these image data signals may influence each other and the signal waveform may be distorted, resulting in a problem in that the brightness and color at the left and right ends of the received image are disturbed.

This invention was made to solve the above-mentioned problems, and provides an image data transmission method that prevents waveform distortion of image data signals and does not cause disturbances in brightness or color at the left and right edges of the image. The purpose is to

[Means to solve the problem]

In the still image data transmission method according to the present invention, when still image data divided into a plurality of sections is sequentially transmitted as an analog signal for each section unit, at least one of the image data transmitted at the beginning and end of each section unit is Either one of them is transmitted multiple times.

[Effect]

In this invention, since the image data transmitted at the beginning or end of each classification unit is transmitted redundantly, this additionally transmitted image data overlaps with the image data transmitted continuously. To absorb mutual influence when signal waveforms are significantly different, and to prevent this influence from being exerted on the first or last image data of each division unit necessary for image reproduction.

[Embodiments of the invention]

Hereinafter, one embodiment of the invention of B will be described based on the drawings. FIG. 1 shows one embodiment of the present invention, and is an explanatory diagram showing the structure of an image data signal (4) in the case of a monochrome image. In the figure, the first row luminance signal (5), the second row luminance signal (6), and the last row luminance signal (7) are the same as those shown in the conventional example.

Also, (8) has the same value as the image data at the beginning of each row,
The signal (9) of t image data that is redundantly added to the beginning of each row (hereinafter referred to as settling pulse S1) has the same value as the last image data of each row, and the signal (9) of the image data that is redundantly added to the end of each row. No. 43 (hereinafter referred to as "Settling Pulse S"). However, for example, the settling pulse S1 in the first row and the settling pulse S1 in the second row do not necessarily have the same value.

Next, the operation according to the present invention will be explained, focusing on the transition from the first row luminance signal (5) to the second row luminance signal (6) shown in FIG.

The signal around the transition from the first row luminance signal (5) to the second row luminance signal (6) is the last image data of the first row (i.e. 1
Image data at the right end of the row), 1st row SE 1, ring pulse S yo (9), 2nd row settling pulse 5 (8) Image data at the beginning of the 2nd row (i.e. image data at the left end of the 2nd row) The order is as follows. Here, for example, if the difference in brightness between the image data at the right end of the first row and the image data at the left end of the second row is large, the settling pulse S, (9) of the first row and the settling pulse S of the second row
, (8) influence each other, resulting in distortion of these signal waveforms. However, the last image data in the first line and 1
The brightness difference with the row settling pulse 5JL (9) is sufficiently smaller than the brightness difference between the image data at the beginning of the first row and the image data at the beginning of the second row (therefore, the last image data in the first row is not distorted. , the first row settling pulse S will be distorted instead of the last image data of the first row.Similarly, the second row settling pulse S1 will be distorted, but the distortion of the image data at the beginning of the second row will be prevented. .Then, distortion of the first and last image data of each other row can be prevented in the same manner.

On the receiving side of image data, the settling pulse SS is located at the beginning and end of the image data, so by counting the received image data, it can be easily set.
- The ring pulse S S can be skipped, and a still image with no disturbances at the left and right edges can be reproduced from the image data necessary for image reproduction.

In the above embodiment, two settling pulses are inserted between each row of image data, but it goes without saying that the same effect can be obtained even if more settling pulses are inserted.

Also, the settling pulse can be obtained by adding either SL added at the beginning of each row or Sλ added at the end.
Distortion of image data at either the beginning or end of each row can be prevented.

Furthermore, in the above embodiment, image data is transmitted sequentially from the left end to the right end for each row, but for example, image data may be transmitted sequentially from the top end to the bottom end for each column, or for the first and second rows. A similar effect can be obtained in a system in which the image data of 2000 is combined into one set and the image data is transmitted in a predetermined order. In other words, when image data divided into multiple sections is transmitted sequentially for each section, there is a gap between the last image data transmitted in each section and the first image data transmitted in the next section. Even when there is no correlation, by transmitting the image data at the boundary redundantly, the effect of distortion that occurs between uncorrelated image data is prevented from affecting the image data necessary for image reproduction. It is something that can be done. Therefore, not only in the case of a monochrome image where the image data is only a luminance signal, but also in the case of a monochrome image in which the image data is only a luminance signal, R-Y is generated after the luminance signal as shown in FIG.

The same effect can be obtained by using the same method even in the case of transmitting color image data such as transmitting B-Y color difference signals (8) and (9).

〔Effect of the invention〕

As described above, according to the present invention, when transmitting image data of a still image divided into a plurality of divisions for each division unit,
Since the image data transmitted at the beginning and end of each division unit is transmitted multiple times, the image data transmitted overlappingly absorbs the influence of distortion and is transmitted at the beginning or end of each division unit. This has the effect that image data is prevented from being distorted and image data necessary for image reproduction can be accurately transmitted.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the structure of an image data signal in a still image data transmission system according to an embodiment of the present invention, and FIG.
FIG. 3 is an explanatory diagram showing the configuration of an image data signal according to another embodiment of the present invention, FIG. 3 is an explanatory diagram showing the order in which each signal is sent out when transmitting still image data, and FIG. 4 is an explanatory diagram showing the pixel configuration of a still image and pixels. FIG. 5 is an explanatory diagram showing an example of the transmission order. FIG. 5 is an explanatory diagram showing the relationship between pixel brightness and the transmitted image data signal waveform. FIG. 6 is an explanatory diagram showing the structure of the image data signal by the conventional still image data transmission method FIG. In the figure, (4) is the image data signal, (5) is the first row fault level signal, (6) is the second row fault level signal, (7) is the last row brightness signal, (8), (9) is the settling pulse. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] In a still image data transmission method in which still image data divided into a plurality of sections is transmitted sequentially as an analog signal for each section unit, at least one of the image data transmitted at the beginning and end of each section unit is duplicated multiple times. A still image data transmission method that is characterized by transmitting data as a still image.