JPH0123990B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image signal processing method, and particularly to an image signal processing method for outputting interlaced image signals in the order of scanning lines.

[Conventional technology]

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 from that 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 this time, the vertical positions of the two heads are shifted so that even line signals and odd line signals of tape 1 can be read alternately, and they are alternately switched to obtain a stationary TV frame image.

[Problem that the invention seeks to solve]

In such a system, it is desired to obtain a non-interlaced high-resolution image signal for the purpose of connecting the signal from the recording tape to an existing image printer to obtain a photographic image.

That is, an object of the present invention is to obtain a sequentially scanned high-resolution image signal from an interlaced image signal.

[Means for solving problems]

For this purpose, according to the image signal processing device of the present invention, one scanning line of the signals of the first and second fields constituting one frame of the interlaced image signal has a time width of one scanning line of the image signal. The image signal for one scanning line stored in the pair of storage means is time-axis compressed to one quarter, respectively, and is configured to be able to be written into a pair of storage means, respectively, within a predetermined period corresponding to . reading, the signal of the first field, the mixed signal of the signal of the first field and the signal of the second field, the signal of the second field, the signal obtained by delaying the signal of the first field by the predetermined period, and the second field. A configuration is adopted in which a mixed signal with a field signal is sequentially output within the predetermined period.

〔Example〕

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

Even (first) and odd (second) 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. To this end, 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.

Next, the signal processing system which is the main part of this embodiment will be explained with reference to FIG.

In FIG. 4, 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.

14 to 17 are AND gates, 18 and 19 are arithmetic elements that calculate the average of two input signals, and 2
0, 21, 22, 23 are 1/4H and 2/4 respectively
H, 3/4H, and 1/4H delay lines. 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 are clocked at the storage element section 8, at the speed of the frequency f ₁ of the first clock source 12.
9 is stored. 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 .

This signal is the control signal T ₃ and is transferred from the register section to the outside at the frequency f ₂ of the second clock source 13. The frequency of this second clock source 13
f 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, respectively, to O ₁ ,
O ₂ signal. Part of the signals read from the two registers are input to the arithmetic unit 18, averaged, and passed through the 2/4H delay line 21 to generate interpolated signals O _1, It becomes ₂ . Furthermore, the signal _O2 output 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. It is output as an interpolated signal O _2,5 for the second and third scanning lines.

The above four signals are taken out as one signal O. As shown in the figure, this signal O has each scanning line sequentially arranged in time series, and has an input signal form suitable for a printer or the like. Further, the apparent resolution of this embodiment is four times that of the unprocessed case.

〔Effect of the invention〕

As described above, by using the present invention, it is possible to exchange an interlaced image signal into a time series signal in a line in the order of scanning lines at high resolution without using a large-capacity storage element, for example, by using a recording device such as a printer. , is effective for image recording.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the format of an image signal recorded on a magnetic tape, Fig. 2 is a diagram showing a conventional method for reproducing the signal recorded by the method shown in Fig. 1 as a TV signal, and Fig. 3 is a diagram showing the form of an image signal recorded on a magnetic tape. FIG. 4 is a block diagram showing a signal processing system according to an embodiment of the present invention, and FIG. 5 is a time chart illustrating an embodiment of the present invention. 1... Magnetic tape, 2... Drum, 3, 4,
5, 6... Head, 7... Control circuit, 8, 9, 1
0, 11... Memory element, 12, 13... Clock source, 14, 15, 16, 17... AND circuit,
18, 19... Arithmetic circuit, 20, 21, 22, 2
3... Delay circuit, 24, 25, 26, 27... Shift register, 28... CCD, 29... Exposure section, 30... Transfer section.

Claims (1)

[Claims] 1. One scanning line of the signals of the first and second fields constituting one frame of the interlaced image signal is written into a pair of storage means, respectively, within a predetermined period corresponding to the time width of one scanning line of the image signal. The image signals for one scanning line stored in the pair of storage means are compressed to one-fourth in time and read out, and the signal of the first field, the first
a mixed signal of the signal of the field and the signal of the second field, the signal of the second field, and the signal of the first field;
An image signal processing device characterized in that a mixed signal of a signal obtained by delaying a signal of a field by the predetermined period and a signal of the second field is sequentially output within the predetermined period.