JPS5945771A - Method for converting video signal - Google Patents

Abstract

PURPOSE:To form a video signal for one frame's share of other standard systems, by reading out two lines' share of video signals for one field's share according to a standard system and adding the video signals of two lines' share with a prescribed coefficient respectively for weighting. CONSTITUTION:A composite color video signal for one field's share of the NTSC system picked up and recorded with an electronic still camera 1 is formed. Further, only the field not subject to average interpolation is extracted at a converter 5 from a signal from an auxiliary circuit 34 and a frequency division circuit 37, and a digital signal after A/D-conversion is applied to a memory 44 corresponding to a video signal for one field's share of the NTSC system. Then, the memory 44 is read out sequentially and applied to memories 48, 49 corresponding to the video signal for one line's share and two optionally adjacent line video signals are stored. Further, the signal is read out and multiplied with a prescribed coefficient and the outpt of multiplication is added. Thus, the video signal for one frame's share of the CCIR system is formed from the video signal for one field's share of the NTSC system.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applied to a so-called electronic still camera that captures and records still images 11 using, for example, a CCD imaging device and a four-dimensional disk. The present invention relates to a method of converting a video signal when the video signal is 1) reproduced on a television monitor.

BACKGROUND ART AND MEDIUM W41 point CCDCC imaging device A so-called electronic still camera has been proposed that captures and records still images using a magnetic disk. Still images distributed in this way can be reproduced on a television monitor in addition to creating so-called paper copies using a printer.

By the way, in the electronic still camera described above, when recording signals on a magnetic disk, for example, for chroma signals, three color signals of red, green, and blue are recorded independently due to the relationship with the printer. Further, the horizontal scanning line is based on, for example, the NTSC system, but field recording of 262.5 lines is generally performed here due to the relationship with the CCD imaging device.

When playing still images from signals recorded in this way on an NTSC TV monitor, it is necessary to play back the signal as is in odd fields, and to perform interlaced scanning by interpolating the average value of two lines in even fields. The other line is formed, and the extracted three color signals are supplied to an NT8C encoder to produce a normal NTSC color video signal.

However, in such a device, there are cases where it is desired to reproduce the signal on a TV monitor using the CCl11° system. However, the equipment becomes quite large. For example, the above-mentioned even field signal is a pseudo signal resulting from average value interpolation, and if such a pseudo signal is further subjected to system conversion, a problem will arise in the accuracy of the signal.

OBJECTS OF THE INVENTION In view of these points, the present invention has an IMj, fl configuration, and is capable of converting from a video signal for one field of the semi-standard method to a video signal for one frame of another standard method. It is something that forms a).

SUMMARY OF THE INVENTION The present invention reads out two lines of video signals for one field in accordance with the - voting quasi-method, and reads out the video signals for two lines each. Each is weighted and added by a predetermined number of threads, and different predetermined coefficients are determined sequentially over a predetermined number of lines. This is a video signal conversion method in which one frame of video No. 48 is formed, and according to this method, one frame of video signal No. 48 is converted from one field of the standard format video signal with an hour wheel configuration. It is possible to form a video signal for one frame of other standard methods.

Embodiment In FIG. 1, an electric disk (2) photographed and recorded by an electronic still camera (11) is mounted on a turntable (301) of a playback device (3).

In this reproduction equipment 66 f, 31, the turntable e
(11 is motor C (+1 rotationally driven, Tisfu (2
) on the embankment-like track [3 colors of red, green, and bamboo signals of each field recorded in the head (32r)]
, (3zg), and (32b) are repeatedly played back. This fragrant signal is supplied to the interpolation circuit (34) through the amplifier CI3+. Further, the motor C31) is provided with a pulse generator (351), and the turntable CjOl is
As it rotates, a signal is formed. This signal is sent to the servo circuit (36) (u-48 to control the rotation of the motor C31), and is also supplied to the frequency divider circuit (,)n to control one rotation (one field) of the turntable 00. An inverted signal is formed each time the signal is angularized). For example, the signal from the amplifier (13) is output to the short field, and in the even field, the adjacent line is connected between the average signal is output. This output signal is fed to the NT8'C encoder (to)
A combined color video signal of the TSC system is formed, and this signal is supplied to the NT8C monitor (4) through the terminal (39C).

In this way, one frame of 4i video signal is captured from one field of video signal shot and recorded by the child's still camera (1).
The number is formed and the TV monitor (・ri) is born.

Furthermore, the circuit between 111j (, 5 and 11 and the frequency dividing circuit (37
) are connected to terminals (39r), (39g), (39b), which are connected to a printer (not shown), for example.
) and (39p). This terminal (39r)
The signal from ~ (39p) is sent to converter R (51 (7) terminal (
4or) , (4og) , (40b) and (40p
) and this conversion device 2. ¥, (!3
), E:1. ! Child (4or).

The signals from (40g) and (40b) are supplied to the gate circuit (40b), and the signal from the terminal (40p) is supplied to the control terminal of the gate circuit (41), and the above average value interpolation is performed. Only the field that does not exist is output as 1. The signal of this field is relayed to the AD conversion circuit (42). Also, the signal from the terminal (40p) is sent to the same 4 generator (1 to 4 '1.^11 is applied to form a clock signal with lff-1 suppressed.

This clock signal is input to the AD '4i+ circuit (421).
The digital signal from the supplied digital signal from the digital circuit (411) is AD converted.
Furthermore, the clock signal from the oscillator (43) is supplied to the address counter (45), and the address signal S formed is supplied to Memo!J (44+), and the digital signal is 'yxL address.

In addition, a reference hole and a shaker (4fi) are installed, and the i3 camera (4R from <61) is installed on the open side 1 circuit (13
1; Provided. The read clock signal from this sword control circuit (47) is then supplied to the address counter (41),
Memory (441K stored data, - numbers are read out in sequence.' This read out word number corresponds to one line of video signal.)
! IJ, A (H'H) is sent to the memory IJ (ail, (4!li), and the signal from the control circuit (4!
1. Two lines of video signals that are supplied and arbitrarily placed next to each other are described in 1. (Used. Furthermore, this signal is 1fNJ 'f+η
] read out by No. 48 from 1llll road (47),
1 multiplier each! i[Il + 511 is supplied with I(1), and the respective predetermined coefficients from the ;I++↑1111 circuit (47) are supplied to the multipliers (5(1) and (5υ), and these multiplication outputs are with vessel Cj2) JI+
η will be done.

Here, the second ζ diagram is a figure corresponding to a cross section of the screen taken in the vertical iθ direction, and each arrow indicates a signal at that point on each line. When a signal 1) N1 to DN6 as shown by the solid line at 11111 on the left side of the figure is supplied, using coefficients a and b, i5 No. 18 DC1 to Dcs (odd field ) and Dc'
1 to DC'6 (even field).

In other words, the value of the coefficient a
) C'6 is shaped M.

As a result, 12 lines of signals are formed from 5 lines, and this is repeated 52 times, resulting in 624 lines from 260 lines.
A line is formed. From the January issue of one field of NTSC to the signal of one room of CCI H, it is formatted as JR. 7. C's N T S C is 262.5 lines, and CCI R's 17
The number of lines is 625 lines, but if it is within the range of the effective screen, there will be no more than 625 lines.

Then, the signal is CCIR (52)
The memory G, '9 IC (J') corresponding to the e search ig O for one frame of the system is supplied, and the control circuit 6+'/
) is supplied to the memory G; (), and the signals from the input counters are stored at respective predetermined addresses.

The signal recorded in this memory 63) is the control amount Il! 2
i (47) are read out sequentially at a predetermined timing, and this signal is sent to the DA conversion circuit i (47).
4) is supplied to the three-color analogue of red, green, and blue)
- is formed. These three color signals are FAI or S
It is supplied to the encoder G of ECAM to form a combined color image ID of PAL or S1'ECAM system, and this signal is sent to the baby (56C)]mji-Cl'AI,
Alternatively, it is supplied to the SECAM monitor ((4).

In this way, a video signal for one frame in the CCI R system is formed from a video signal for one field in the NTSC system.According to the above-mentioned device 6, a video signal for one frame in the CCI R system is formed from the video signal for one field in the NTSC system. Transformation and NTSC to CCI 1
Since the conversion to % is performed at the same time, the number of devices can be increased easily and there are fewer errors caused by the conversion.

l:c With the above-mentioned equipment, odd field signals and even field signals may be formed at the same time, in which case the signals DN1 and 1) N2 to the signals DC1+ 1) CI,
DC2 is formed and stored at a predetermined address in the memory ().

Also, in the above example, 4υ of one frame of CCIII is formed from one field of N 'l'' S C, but conversely, one field of CClft is formed from one field of NTSC.
When forming a frame signal, the following y(2, equation (
2), the signal D as shown by the solid line tilting to the right in Fig.
Effects of the Invention According to the present invention, signals DNI to DN5 and DN'1 to DN'5 as shown by solid lines and dashed lines on the left side are formed from C1 to Dc7. It was possible to form a video signal for one frame using other standard methods from a video signal for one field.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an example of the present invention.
9. It is 1 ton I for tsu j. (44) is 7 e#)" l memory, (47) is control 11 circuit, (481, (4!) is line memory, ('i(l), c'J1) is multiplier, 6: () is 7
It's a flash memory.

Claims (1)

[Claims] For a video signal for one field according to one standard method, this video signal is read out for two lines at a time, and these two
The video signals for each line are weighted and added by a predetermined coefficient, and different predetermined coefficients are sequentially determined over a predetermined number of lines. A video signal conversion method in which a video signal for one frame is formed according to the above.