JPS59172890A - Picture reproducing system - Google Patents

Abstract

PURPOSE:To attain high speed processing, simplicity and reduction in power consumption by decreasing a print and a transmission time when a reproduced picture signal is a black-and-white signal and stopping power to a chrominance signal processing section. CONSTITUTION:A still picture signal reproduced by a magnetic head 6 is separated and demodulated,and the obtained reproducing luminance signal and two color difference signals are applied to an encoder circuit 12. On the other hand, the reproduced line sequential color difference signal is applied also to a level detecting circuit 14 so as to discriminate whether the signal is a black-and-white picture signal or a color picture signal, and the discriminating signal is applied to output terminals 15 and 15', and a sequence circuit 16. The sequence circuit 16 controls a signal processing system circuit in response to this discriminating signal. Further, a picture signal is applied to terminals 17 and 17'. The print or transmission time is reduced in the printer 2 and the transmitter 3 respectively in case of the black-and-white signal and the supply of power to the chrominance signal processing section is stopped.

Description

[Detailed description of the invention] (Technical field) The present invention relates to an image reproduction system.

(Prior Art) In addition to television receivers, other devices that use the reproduced image signals obtained by conventional image signal reproducing devices include printers and transmitting devices that use telephone lines to transmit image signals. be.

Incidentally, in recent years there has been remarkable progress in systems using color image signals, including recording and reproducing devices such as color videotape recorders, color still image recording and reproducing devices,
2 - Development of printers and color image signal transmitting devices is progressing.

Further, recording and reproducing devices for color image signals are generally capable of recording and reproducing not only color image signals but also monochrome image signals.

However, when trying to supply a black and white image signal produced by such a color recording/reproducing device to a color printer or a color image signal transmitting device for printing or electronic transmission, the time required for printing or transmission is longer than the color image signal. This is the same process as when dealing with , and this creates a major obstacle in speeding up office work and in improving operability.

(Objective) The present invention overcomes the above-mentioned drawbacks and aims to provide a system capable of speeding up and simplifying processing in a device that handles reproduced image signals obtained by a reproduction device.

(Example) The present invention will be described in detail below using examples.

Note that the citation of the following examples does not limit the scope of the present invention, and the present invention can be modified as appropriate within the scope of the claims.

FIG. 1 is a diagram showing an image reproduction system as an embodiment of the first invention of the present application. This embodiment is based on the first invention of the present application, and is a system including a reproducing device that records one field of an image signal as a still image on a circular track of a recording medium and reproduces the recorded still image to obtain a still image low signal. It was applied to

In FIG. 1, the recyclable bag ut12 is a printer as another device, and 6 is a transmitter as another device. First, the playback device 1 will be explained. 4 is a magnetic sheet,
Image signals for one field are recorded on the circular track on this sheet 4. 5 is a motor that rotates the sheet 4 at a predetermined speed, and 6 is a magnetic head that traces the magnetic sheet 4.

Here, the sheet 4 is rotated at the same rotational speed as during recording, and the magnetic head 6 continuously reproduces the same circular track to obtain a reproduced still image signal. The image signal reproduced from the head is amplified by a reproduction amplifier 7 and then supplied to a luminance signal-chrominance signal (y-c) separation circuit 8. The signal format of the currently recorded image signal is a multiplex of a luminance signal that is FM modulated in a high frequency band and a color signal that is a line sequential color difference signal that is FM modulated in a low frequency band. shall be.

The Y-G separation circuit 8 obtains an FM modulated luminance signal and an FM modulated line sequential color difference signal.The FM modulated luminance signal is sent to an FM demodulation circuit 9, and the FM modulated line sequential color difference signal is sent to an FM demodulation circuit 10. Supplied. The reproduced luminance signal obtained by the FM demodulation circuit 2B is supplied to the process circuit 11. The process circuit 11 includes, in addition to the well-known flag circuit and de-emphasis circuit, a circuit for compensating for discontinuity in the horizontal synchronizing signal that occurs when one field of image signals is continuously reproduced. The reproduced luminance signal obtained by the process circuit 11 is supplied to the encoder circuit 12.

On the other hand, the reproduced line-sequential color difference signal obtained by the FM demodulation circuit 10 is supplied to the process circuit 16. The process circuit 1-6 includes a circuit for synchronizing sequential signals and a circuit for compensating for the discontinuity of the horizontal synchronization signal described above. Two color difference signals obtained by the process circuit 15, for example, B (blue)-Y and R (red)-Y, are supplied to the encoder circuit 12.

The line-sequential color difference signal reproduced by the FM demodulation circuit 10 is also supplied to the level detection circuit 14. The level detection circuit 14 detects the level of the reproduced color signal to determine whether the reproduced image signal is a black and white image signal or a two-image signal. When the type of image signal is discriminated in this way by the detection circuit 14, the discrimination signal which is the output of this circuit 14 is sent to the output terminal 15, 15' and the sequence circuit 16.
supplied to The sequence circuit 16 controls each part of the signal processing circuit according to this discrimination signal. For example, when the reproduced image signal is a black and white image signal, the process circuit 16 is controlled to perform processing such as cutting off the transmission path of the color signal processing system.

The encoder circuit 12 also supplies a television signal, such as an NTSC signal, to an output terminal 17, 17'.

The image signal output to the terminal 17 is supplied to the signal processing circuit 2o via the printer 20 input terminal 18. The above-mentioned discrimination signal outputted to the terminal 15 is supplied to the sequence circuit 21 of the printer 2 via the input terminal 19. The sequence circuit 21 controls the signal processing circuit 20 and the printer section 22 according to the determination signal. That is, when the image signal input to the signal processing circuit 20 is a monochrome image signal, the signal processing process in the signal processing circuit 20 is performed so that the printing time of the image in the printer section 22 can be shortened when it is a color image signal. The method and timing of printing in the printer section 22 are controlled. Furthermore, the supply of power to the color signal processing portion of the signal processing circuit 20 is stopped. By doing so, it is possible to shorten the image printing time and further reduce power consumption.

Further, the image signal output to the terminal 17 is supplied to the signal processing circuit 25 via the input terminal 26 of the transmitting device 6. On the other hand, the aforementioned discrimination signal outputted to the terminal 15 is supplied to the sequence circuit 26 of the transmitting device B via the input terminal 24.

The sequence circuit 26 operates the signal processing circuit 2 according to the discrimination signal.
5 and the transmitting circuit 27. That is, when the image signal input to the signal processing circuit 20 is a monochrome image signal, the signal processing is performed so that the transmission time of the image signal for one screen in the transmission circuit 27 is shortened compared to when it is a color image signal. The signal processing method in the circuit 25 and the transmission timing in the transmission circuit 27 are controlled. For example, when transmitting a color image signal, the color information signal is transmitted for 4 periods, but when transmitting a monochrome image signal, the luminance ii! I will make it a point to send out the 7th signal. Furthermore, the supply of power to the color signal processing portion of the signal processing circuit 20 is stopped. The signal transmitted by the transmitting circuit 27 is supplied from the output terminal 2B to a receiving device through, for example, a telephone line. By adopting such a configuration, it is possible to shorten the image transmission time and reduce power consumption.

FIG. 2 is a diagram showing a reproducing device in an image reproducing system as another embodiment of the first invention of the present application. Regarding the Gl and W configurations of other devices, it is possible to adopt a configuration similar to that of the system shown in FIG. 1, and the drawings and explanations will be omitted. Further, in the playback device shown in FIG. 2, the same components as those in the playback device d1 shown in FIG.

In FIG. 2, the vertical blanking period of the image signal for one screen recorded on the magnetic sheet 40 circular track includes the type of image saturation (force 2 - whether it is an image signal or a monochrome image signal, and Original I^-like 2 with no tonality and only black and white
It is assumed that a discrimination signal for discriminating whether the image signal is a digital image signal or not is FM-modulated and multiplexed together with the luminance signal. The discrimination signal is multiplexed in the vertical blanking period of the reproduced luminance signal demodulated by the FM demodulation circuit 9. The discrimination signal reproducing circuit 29 divides the discrimination signal, generates a discrimination signal similar to that generated by the level detection circuit 14 in the system of FIG. do.

Even in a system using this four-layer reproducing device, the same effects as the system shown in FIG. 1 can be obtained. Furthermore, when the reproduced image signal is a binary image signal, the sequence circuit 21 of the printer 2 and the sequence circuit 26 of the transmitting device 26 operate according to the determination signal, so that the print time in the printer 2 is changed by the transmitting device. 6, the transmission time is each further reduced. Note that the discrimination signal is not limited to the one multiplexed in the vertical blanking period of the image signal, but can also be multiplexed in other parts such as the horizontal blanking period, or in other bands such as the very low frequency band. It may be recorded on another medium.

FIG. 6 is a diagram showing a reproducing device in an image reproducing system as an embodiment of the second invention 9 of the present application. The configurations of other devices can be similar to the system shown in FIG. 1, and the drawings and explanations will be omitted. Further, in the reproducing apparatus shown in FIG. 6, the same components as those of the reproducing apparatus 1 shown in FIG.

In FIG. 6, 50 is a mode selection circuit which selects the type of single-plane image signal to be output. This mode selection circuit 60
A selection signal which is the output of is supplied to the sequence circuit 16, and the sequence circuit 16 controls each signal processing circuit in the device according to this selection signal.

First, when the black image signal is selected, the gate circuit 61 is rendered conductive, and the line-sequential color difference fij code demodulated by the FM demodulation circuit 10 is supplied to the process circuit 15 as it is.

Further, the switch 62 is connected to the illustrated A side terminal, and the output luminance signal of the process circuit 11 is output to the encoder circuit 12 as it is.

When a black and white image signal is selected, the gate circuit 51 is rendered non-conductive, the color signal transmission system is cut off, and the Fyi
, demodulation circuit 10. Stop supplying power to unnecessary parts such as the process circuit 16. Furthermore, when a binary image signal is selected, the switch 62 is connected to the B terminal, and the output luminance signal of the process circuit 11 is binarized and output to the encoder circuit 1.
Supply to 2.

Furthermore, the luminance signal is prevented from passing through portions of the luminance signal processing circuits such as the FM demodulation circuit 9 and the process circuit 11 that are only concerned with demodulation performance.

The selection signal which is the output of the mode selection circuit 5o is supplied to the terminal 17.
17' to other devices, and functions similarly to the discrimination signal in the system shown in FIGS. 1 and 2. As a result, the printing time in the printer 2 can be shortened, and the transmission time in the transmitting device 6 can be shortened. For example, if Power 2 - Image signal is selected, the print time is 6 to 4 minutes as before, and the transmission time is 10 to 20 minutes when using a public telephone line.
If a binary image signal is selected, the printing time can be reduced to 1 minute or less, and the transmission time can be reduced to 1 minute or less.

In the above-described system, circuits that are conventionally known in this type of system, such as a quadruple-out compensation circuit, are omitted for the sake of simplicity.

(Effects) As explained below using the embodiments, according to the present invention, an image reproduction system is obtained which can always maximize the speed of processing in a device that handles reproduced image signals obtained by a reproduction device. Also, the power consumption of the system can be minimized.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an image reproduction system as an embodiment of the first invention of the present application, FIG. 2 is a diagram illustrating a reproduction device in the image reproduction system as another embodiment of the first invention of the present application, FIG. 6 is a diagram showing a reproduction device in an image reproduction system as an embodiment of the second invention of the present application. 0 1 is a reproduction device, 2 is a printer as another device, and 6 is a transmission device as another device. device, 6 is head, 7 is amplifier, 9
, 10 is an FM demodulation circuit, 11.15 is a process circuit, 1
4 is a level detection circuit, 16 is a sequence circuit of the reproduction device, 20 is a signal processing circuit of the printer, 21 is a sequence circuit of the printer, 25 is a signal processing circuit of the transmitting device, 26 is a sequence circuit of the transmitting circuit, and 29 is for discrimination. 60 is a mode selection circuit, 51 is a gate circuit, 62 is a switch, and 35 is a binarization circuit. Applicant Canon Co., Ltd.

Claims (1)

[Scope of Claims] 1) A reproducing device including a reproducing means for reproducing an image signal and a determining means for determining the type of the image signal reproduced by the reproducing means, and a device for receiving a reproduced signal from the reproducing device. and another device including a signal processing means for converting the signal form of the reproduced image signal reproduced by the reproduction means, and a control means for controlling the signal processing means by a signal according to the discrimination means. Image playback system. 2, a reproducing device comprising: a reproducing means for reproducing the image signal; a selecting means for selecting the type of image signal to be output; and a converting means for converting the type of the reproduced image signal reproduced by the reproducing means according to the selecting means; , a signal processing means for receiving a reproduced signal from the reproduction device and converting the signal form of the reproduced image signal converted by the converting means, and controlling the signal processing means with a signal according to the selection means. and other devices including control means.