JPS6234196B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for reproducing, displaying, and recording image signals recorded on a recording medium.

Recently, a method of electronically recording an image signal obtained by two-dimensionally scanning a still image has become known. For example, it is disclosed in Japanese Patent Application Laid-Open No. 49-52912, and to explain the still image recording method, the recorded image is exposed to a memory self-scanning sensor such as a CCD, and the sensor
Two field signals for 2:1 interlace for TV display are extracted in parallel and recorded in the form of two tracks on a magnetic tape that is continuously fed at low speed using two magnetic heads. As shown in FIG. 1, odd line signals are recorded on the A track of the magnetic tape 1, and even line signals are recorded on the B track. Each track is a series of TV scanning line signals, and 250 scanning lines constitute one field screen.

The film 1 on which the video signal has been recorded in this way is wound around the drum 2 so that one field is in contact with the drum 2, as shown in FIG.
Read with. At that time, the vertical positions of the two heads were shifted so that the even line signal and odd line signal of tape 1 could be read alternately, and the heads were switched alternately and then stopped.
Get the TV frame image.

In this system, it is desired to connect the signal from the recording tape to an existing image printer to obtain a photographic image.

A first object of the present invention is to provide a method for reproducing an image signal from a recording medium on which an image signal is recorded as described above, in which the recording medium can be used in a printer such as an LBP (laser beam printer), inkjet recording, or thermal head recording. Another object of the present invention is to provide a reproduction method capable of inputting a signal and converting the signal for recording an image.

A second object of the present invention is to create an interpolated image signal between scanning lines by performing calculations between the signals read by the plurality of detectors, and to provide a high-resolution image. The purpose is to provide a method for reproducing the signal.

Next, one embodiment of the present invention will be described using the drawings.

The even and odd field signals of the magnetic tape 1 recorded in the form shown in FIG. 1 are simultaneously read by two reproducing heads 5 and 6 shown in FIG. The signals read in this manner become two-sequence signals corresponding to odd and even fields, as shown in FIG. It is difficult to operate existing printers with signals as they are. In order to operate an existing printer, a signal is required in which the scanning line signal of one frame image in which odd and even field images are interlaced is sequentially converted into a time series. For this purpose, in this embodiment, the signals read by the two heads are compressed, and the even and odd signals are interlaced and rearranged for each scanning line as shown in FIG. 4.

Next, a processing system for obtaining the signals shown in FIG. 4 and 2 will be explained with reference to FIG.

In FIG. 5, 7 is a control circuit section that generates a control signal;
Reference numerals 8 and 9 are memory element sections, 10 and 11 are register sections, 12 is a clock source for transferring signals to the memory element, and 13 is a clock source for driving the register.

The memory element sections 8 and 9 and the register sections 10 and 1
It is preferable to use an element in which 1 is integrated and the storage signals are sent all at once to the register section, but a CCD element can be used as such an element.

FIG. 6 shows a timing chart between each signal. In FIG. 6, T ₁ , T ₂ , T ₃ , and T ₄ are gate signals issued from the control circuit section 7, S ₁ and S ₂ are image signals read by the heads 5 and 6, and O ₁ and O ₂ are This is a signal obtained from a CCD with a transfer section.

The operating principle is shown below. Odd and even field image signals S ₁ and S ₂ are controlled by a control signal T ₁ and stored in storage elements 8 and 9 at a speed corresponding to frequency ₁ generated by first clock source 12. The pulse width of _T1 is the time width of one scanning line, and the image signal for one scanning line is stored. This signal is transferred to the register sections 10 and 11 by a control signal _T2 provided during the blanking time of one scanning line. These signals are control signals T ₄ and T ₅ which clock the register unit 1 at a speed corresponding to the frequency ₂ generated by the second clock source 13.
It is read from 0 and 11. When the frequency of this second clock source 13 is twice the first clock source frequency ₁ , signals O ₁ and O ₂ are obtained at twice the speed of input signals S ₁ and S ₂ and are superimposed. Even and odd field signals are obtained as an interlaced signal O.

This signal O is suitable for driving existing printers. For example, in recording using LBP, one frame of image is sequentially recorded one scanning line at a time.

In FIG. 5, 14 to 17 are AND circuits.

Next, an embodiment will be described in which image processing, which is the second object of the present invention, is performed to obtain a high-resolution image. In a normal image, signals between adjacent scanning lines have a high correlation. In such a case, by interpolating signals between scanning lines and creating new scanning lines, it is possible to apparently increase the resolution.

FIG. 7 shows a block diagram of a processing system for obtaining interpolated signals. 7 to 16 are the same elements as in the previous embodiment shown in FIG. 18 and 19 are arithmetic elements that calculate the average of two input signals; 20, 21,
22 and 23 are 1/4H, 2/4H, 3/4H, respectively.
and a 1/4H delay line. Here, H represents the length of one scanning line.

Next, the principle of operation of the processing system will be explained using the timing chart shown in FIG.

As in the previous embodiment, the odd and even field image signals S ₁ and S ₂ are controlled by the control signal T ₁ and stored in the storage elements 8 and 9 at the speed of frequency ₁ of the first clock source 12. . The pulse width of _T1 is the time width of one scanning line, and the image signal for one scanning line is stored. This signal is a control signal within the blanking time.
The signal is continuously sent to the register sections 10 and 11 by the pulse of _T2 .

These signals are control signals T ₄ and T ₅ and are transferred from the register section to the outside at a speed of frequency ₂ of the second clock source 13. This second clock source 13
frequency ₂ is four times the first clock source frequency.

The signals read from registers 10 and 11 pass through 1/4H and 3/4H delay lines to O ₁ ,
It becomes an _O2 signal. Also, a part of the signals read from the above two registers is input to the arithmetic unit 18,
The signals are averaged and passed through the 2/4H delay line 21 to become interpolated signals O ₁ and O ₂ for the first and second scanning lines. Further, the signal _O2 outputted from the delay line 22 passes through a 1/4H delay line and is delayed by a total of 1H, and enters the arithmetic unit 19 at the same time as the third scanning line signal read out from the register 10, and the two signals are averaged. 2nd scan line and 3rd scan line
Scan line interpolation signal O ₂

Claims (1)

[Claims] 1. A method of reproducing an image signal from a recording medium in which a plurality of scanning line signals constituting a screen are recorded in a plurality of groups, the method comprising simultaneously reproducing the recorded signals of each group from the recording medium, and One scanning line segment of the reproduced recording signal of each group is stored in a plurality of storage devices, respectively, and the one scanning line segment of the signal stored in each storage device is read out in the order of the scanning lines forming the screen. Image signal reproduction method.