JPS6044859B2 - Image display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an image display device, and in particular displays high-resolution images including fine text, drawings, etc. even on display devices with not-so-high resolution such as consumer television receivers, The present invention relates to an image display device that allows images to be viewed.

FIG. 1 is a block diagram of a conventional device.

This device rotates a disc-shaped magnetic sheet on the receiving side,
It has a magnetic sheet memory that records data by pressing a magnetic head against it as an image memory, and the image signal that is slowly transmitted is recorded in the memory, and even after the signal is transmitted, the single image is still displayed on the television. - It is a device that can be viewed indefinitely on a display device such as a machine. The image transmitter 1 is, for example, a facsimile transmitter, and generally uses a modulator 2 to pass through a transmission line 3 of radio or telephone line.

The modulated image signal sent through the transmission path 3 is returned to the original image signal through the demodulator 4. The recording circuit 5 modulates the image signal into a format that is easy to record on the magnetic sheet memory, and includes a recording gate to the memory, etc.
The image signals transmitted under the control of the controller 9 are recorded in the magnetic sheet memory 6.

There is a method of recording by slowly rotating a magnetic sheet to record the transmitted information as it is, or a method of recording it once in a buffer memory and then reading it out at high speed and dividing it onto a sheet and recording it. The servo circuit 10 includes a synchronous separation circuit 8 to record the image signal at a predetermined position on the sheet.
The sheet memory motor is rotated in synchronization with the synchronization signal separated from the image signal by. The image signal recorded on the sheet includes a vertical synchronization signal and a horizontal synchronization signal that meet the standards of commercial television broadcasting so that the sheet can be reproduced by rotating the sheet at high speed and displayed on the television receiver 11 as it is.

These synchronization signals can be included in the image signal and sent in advance at the time of transmission, or can be recorded simultaneously when the image signal is recorded in the sheet memory. The image signal reproduced through the reproduction circuit 7 is applied to a display device such as a television receiver, and the image is displayed. In such conventional technology, signals for one screen to be displayed on a television receiver are recorded in a memory and reproduced as they are.

Figure 2 shows the signal.The image signal includes a vertical synchronization signal V and a horizontal synchronization signal H so that it can be displayed on a television receiver.If the image signal S sent is a facsimile signal, In this case, one main scanning signal is contained in one horizontal scanning period in the case of television. ．． A television receiver is accommodated in one horizontal scanning period for television. The resolution of a television receiver is 350TV in the vertical direction according to the standards of television broadcasting.
This is approximately 340 T'V in the horizontal direction. On the other hand, there are 4 fax machines/T! Devices with a resolution of n or more are common, and if this is converted to the resolution of television, even on a paper surface with an effective width of about 150 m, there will be 600 TV lines in the horizontal direction. In this way, facsimile images generally have higher resolution than television images, so when displaying a sent thick manuscript on a television receiver, it is difficult to read fine text as it is. Furthermore, this is very inconvenient, as the original used for facsimile transmission cannot be used as is for recipients whose recipients have television receivers, as they must be rewritten in larger fonts.

An object of the present invention is to provide an apparatus which uses an inexpensive but not very high resolution television receiver as a display device and can also receive high resolution facsimile manuscripts.

Another object of the present invention is to provide a receiving device that can read fine characters even in high-resolution facsimile originals without rewriting them to larger characters.

The present invention will be explained in detail below using examples. FIG. 3 shows the configuration of the present invention. The configuration and functions of the image transmitter 1, modulator 2, transmission line 3, demodulator 4, recording circuit 5, synchronization separation circuit (1) 8, controller (1) 9, servo circuit 10, etc. are completely the same as in the conventional example. be. The difference between the present invention and the conventional example lies in the method of reproducing the signals recorded on the sheet. The signal recorded in the sheet memory is returned to the original signal through the reproducing circuit 7, and is written into two buffer memories 18 and 19 alternately. The buffer memory preferably has variable writing and reading speeds. Writing of image signals into the buffer memory is performed by a first clock generator 20, and reading is performed by a second clock generator 21.

In this system, the frequency of the first clock is higher than that of the second clock. The read image signal is added with a vertical synchronization signal and a horizontal synchronization signal in an image synthesis circuit 25 so that it can be displayed on the television receiver 11, and then displayed on the television receiver 11. The second synchronization separation circuit 23 extracts only each synchronization signal from the image signal including the vertical synchronization signal and horizontal synchronization signal reproduced from the sheet memory. The second controller 22 distributes the reproduced signal to the buffer memory, the first and second
The clock generators 20 and 21 are switched. The synchronization signal is also sent to a synchronization signal generator 24.

This circuit generates a new vertical synchronization signal based on the synchronization signal read out from the sheet memory, and as described later, the circuit generates a new vertical synchronization signal for the vertical direction of the transmitted image that is not displayed on the cathode ray tube surface of the television receiver. This allows images to be displayed arbitrarily. Figure 4 shows how recording is performed on the sheet memory.One field of an image signal including vertical and horizontal synchronization signals is recorded in one track, and if the image continues in the vertical direction, the number of tracks is calculated. Just increase it.

Next, to make the function of this device more clear, we will explain it using signal waveforms.

Figure 5 is a waveform diagram explaining the basic operation of this device.
is the image signal waveform reproduced from the sheet memory.

b is the waveform of the write clock to the buffer memory, and this clock is used to sample the image signal and store it in the buffer memory. c is the waveform of the read clock from the buffer memory, and the frequency is selected to be 4 MHz or less, which allows resolution on the television even if the image signal is read from the buffer memory at this frequency. d is an image signal read out from the buffer memory, and since it was read out with the clock of c, the maximum picture frequency is a frequency that can be resolved even by television. As shown in the figure, the first horizontal scanning period m old,
The image signal contained in the image signal is read out in the second horizontal scanning period H2, and the image signal contained in the second horizontal scanning period H2 is read out in the third period H3, and so on. The data is read out of alignment. e is the final signal waveform when the vertical and horizontal synchronization signals and image signals are combined, and it depends on the timing shown in d, so what happens to the image signal included in the 1H on the sheet after being combined? inserted into the eye. In this way, the image signal once recorded in the sheet memory is read at a different frequency via the buffer memory, and by reading it out, even a facsimile signal with a high maximum image frequency can have an image frequency that can be resolved by a television receiver. It can be converted into an image signal. On the other hand, as shown in FIGS. 5A and 5B, only part of the image signal recorded in the sheet memory is written to the buffer memory, so the facsimile image displayed on the television receiver is also part of the recorded image signal. There is a department.

Therefore, it is necessary to be able to see the entire image that is sent using an atomic method. The method is described below. 6th
The figure shows this method using waveforms. Figure 6a is
This is a facsimile image signal recorded on a sheet similar to that in FIG. 5a.

b is a buffer memory write clock start pulse generated after being delayed by an arbitrary time TH from the horizontal synchronizing signal. A write clock c is generated in synchronization with this start pulse. That is, by changing the start position of the write clock, it is possible to change the position at which sampling of the image signal in the sheet memory begins. Figure 6 D, e
, f correspond to FIG. 5C, d, and e, and are image signals synthesized with the readout pulse d, the readout image signal f, and the synchronization signal, respectively. Since the start pulse is delayed by a certain period of time from the horizontal synchronization signal, it can be generated using a monostable multivibrator, etc., and the delay time can be changed using a variome, etc., so it can be used to generate an image of any part in the horizontal direction and the variome. You can see it just by moving the .

Although the explanation so far has been related to the horizontal direction, the same method can be used when the resolution is high in the vertical direction or when the paper surface is longer in the vertical direction than the screen of the television receiver.

Figure 7 shows this method using waveforms. Signals are recorded on two tracks concentrically using two heads on a sheet.
Here is an example. A is a signal recorded on the first track and includes one vertical synchronization signal and a fixed number of horizontal synchronization signals for one track rotation. If the image signal continues in the vertical direction, the recording head is switched to continue recording the signal on the second track as shown in b. ) Playback is performed by writing to and reading from the buffer memory as described above, but if you want to shift the image in the vertical direction, as shown in c, the vertical synchronization signal of the signal read from the first track is delayed by an arbitrary time Tv. A synchronizing signal is generated, and the image signal is read out from the first track and the 52nd track as shown in d, and a vertical synchronizing signal is combined and added to the television receiver for display. Since this method does not perform interlacing, the number of horizontal synchronization signals included in one vertical scanning period must be an integral number. O
Furthermore, even if the vertical and horizontal synchronization signals are in an interlaced relationship, the display can be performed by shifting them in the vertical direction using the same method.

FIG. 8 shows the concept of image display according to the present invention.
A page larger than the display surface of the television receiver can be viewed by moving the volume control or the like.

{1) In the conventional technology, the resolution of the television receiver as an image receiver was not very high, so it was not possible to send a high resolution image signal, but according to the present invention, the television receiver as an image receiver cannot be sent. Even if you use a receiver, you can view high-resolution images, so you can send high-resolution originals.

(2) In the conventional technology, if you wanted to see a high-resolution image, you needed an expensive display device that could display the high-resolution image, but according to the present invention, even if you want to see a high-resolution image, you can use an inexpensive television. It can be viewed on a television receiver.

(3) With conventional technology, it took time and effort to rewrite high-resolution facsimile manuscripts in larger characters to match the resolution of the receiver, but with the present invention, facsimile manuscripts can be sent as they are, so they can be rewritten. etc. will be saved.

The present invention is not limited to the above embodiments, but can be modified in various ways as follows.

(1) According to the above embodiment, a magnetic sheet memory is used as the main memory, but a rotating disk magnetic memory such as a magnetic disk can also be used.

(2) According to the embodiment, a CCD memory uses a magnetic sheet memory as the main memory, but the way the signal is reproduced over time is the same as the magnetic sheet memory, that is, the CCD memory must be constantly read out at a constant speed. The present invention can also be applied to MOS dynamic memories, etc. (3) According to the embodiment, the image signal to be transmitted is a high-resolution facsimile signal that is sent slowly, but it is not only a facsimile signal but also an image signal such as a high-resolution television signal that is sent instantaneously. But of course it's a good thing.

(4) According to the embodiment, by changing the variome, the delay time TH, TV from the synchronization signal is changed and the image being viewed is moved.
You can change the pole, stick, etc. at the same time, but you can also delay it in steps by pressing the button.While the button is pressed, the flow will automatically flow in a specified direction such as left/right, up/down, etc., depending on how hard you press the button. Possible deformations include changing the flow speed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a conventional device, FIG. 2 is a waveform diagram of an image signal recorded in the sheet memory of the conventional device, and FIG. 3 is a block diagram showing the configuration of a device according to the present invention. FIG. 4 is a diagram showing the position on the magnetic sheet of the image signal recorded on the magnetic sheet of the device according to the present invention, and FIG. 5 is a diagram showing the image signal buffer memory read clock, readout clock, A waveform diagram of a read image signal and a composite image signal; FIG. 6 shows an image signal recorded on a magnetic sheet of the apparatus according to the present invention, a buffer memory read clock start pulse, a read clock, a read clock, a read image signal, A waveform diagram of a composite image signal. FIG. 7 shows the image signal on the first track, the image signal on the second track, the vertical synchronization signal delay pulse, and the waveform of the composite image signal recorded on the magnetic sheet of the device according to the present invention. 8 are diagrams for explaining the usage of the present invention. DESCRIPTION OF SYMBOLS 1... Image transmitter, 2... Modulator, 3... Transmission path, 4... Demodulator, 5... Recording circuit, 6... Magnetic sheet memory, 7... Reproduction circuit , 18, 19... buffer memory, 20, 21... clock generator, 25.
...Image signal synthesis circuit, 11...TV receiver.

Claims (1)

[Claims] 1. A first device that stores a signal representing an image at a first resolution.
a storage means, and a first storage means for reading the signal of the first storage means.
a second storage means for temporarily storing the signal read by the first means; a second means for reading the signal stored in the second storage means; The read signal is converted to a second resolution lower than the first resolution.
display means for displaying the same image as an image at a resolution of The signal when expressed at the resolution is set as the signal amount when expressed at the second resolution, and then the signal amount when expressed at the second resolution is
The second means is characterized in that the signal stored in the second storage means is adapted to the display timing of the display means and supplied to the display means. Image display method. 2. A first memory that stores a signal representing an image at a first resolution.
a storage means, a first means for reading the signal of the first storage means, a second storage means for temporarily storing the signal read by the first means, and a storage means for storing the signal in the second storage means. and a display means for displaying the signal read by the second means as an image; When performing sampling on the signal, by controlling the starting position and sampling rate, a signal representing a part of the image is selected and then stored in the second storage means; . An image display method, wherein the second means adapts the signal stored in the second storage means to the display timing of the display means and supplies the signal to the display means.