JPH0567302A - Image signal processor - Google Patents

Abstract

PURPOSE:To avoid a dubbing operation exceeding a prescribed number of times, and to suppress deterioration of an image signal within a prescribed range by adding the number of times of dubbing to an information signal together with the image signal. CONSTITUTION:At the time of dubbing, an image signal from a disk driving part 24 is demodulated by a reproducing circuit 25 and stored in a memory 22. It is read out to a recording circuit 23 and modulated again, and recorded onto a floppy disk 24c by a magnetic head 24b through a switch 24a. ID information added at the time of recording has a prescribed format and '1' is written in a user area as the number of times of dubbing, and thereafter, at every budding, '1' is added to an ID signal. At the time of reoperation, the ID information outputted from the reproducing circuit 25 is supplied to a video output circuit 27, the image signal to which the contents of the ID signal are multiplexed is outputted to a display device and the number of times of dubbing is displayed. Since an operator can confirm visually the number of times of dubbing, dubbing exceeding a prescribed number of times of dubbing is avoided, and deterioration of the image signal can be suppressed easily within a prescribed range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image signal processing device for processing an image signal, and more particularly to an image signal processing device having a function of performing a dubbing operation.

[0002]

2. Description of the Related Art As a conventional image signal processing device for processing an image signal, for example, a still video camera is generally used.
An image signal is recorded on a recording medium such as a video floppy disk (VF), and the image signal is read from the recording medium and displayed on a display device such as a CRT. In such a still video camera, a memory for temporarily storing an image signal is provided, the image signal read from the recording medium is stored in the memory, and the image signal is recorded in another storage area of the recording medium. Some have a dubbing function.

[0003]

Such a dubbing function is convenient for performing an editing function such as moving an image signal on the same recording medium at high speed and easily. If this is repeated, there is a drawback that the image signal is deteriorated by the dubbing operation and the quality of the reproduced image is significantly deteriorated. In particular, when the number of times of dubbing is repeated, the high frequency component of the image signal is deteriorated, and the contour portion of the reproduced image is blurred. Further, since the dubbing operation is easy, the operator tends to easily perform the dubbing operation, and the valuable image is deteriorated by the dubbing operation.

The present invention has been made in order to solve the drawbacks of the conventional image signal processing apparatus, and uses the dubbing frequency data added to the information signal to be recorded on the recording medium together with the image signal to improve the image quality of the dubbing. It is possible to warn of deterioration and prohibit dubbing more than a predetermined number of times,
An object of the present invention is to provide an image signal processing device capable of preventing deterioration of an image signal due to a dubbing operation.

[0005]

An image signal processing apparatus of the present invention comprises a recording means for recording an input image signal on a recording medium, and a reproducing means for reading and reproducing the image signal recorded on the recording medium. In an image signal processing device comprising a control means for controlling the operation of each means, a counting means for counting the number of times of dubbing, and an information signal to be recorded together with the image signal on the recording medium, the counting means. The control means is provided with a data adding means for adding the data of the number of times of dubbing counted by.

Further, the control means of the image signal processing apparatus of the present invention comprises a reading means for reading the number-of-times data in the information signal during a reproducing operation, and a display means for displaying the number-of-times data read by the reading means. It is characterized by having.

Further, the control means of the image signal processing apparatus of the present invention compares the number-of-times data read in the information signal during the reproducing operation with the number-of-times data read by the reading means to a predetermined value. And a prohibiting means for prohibiting the dubbing operation when the number-of-times data compared by the comparing means is equal to or more than the predetermined value.

[0008]

In the image signal processing apparatus of the present invention, the number of times of dubbing is counted by the counting means, and the data of the dubbing number is added to the information signal recorded on the recording medium by the data adding means together with the image signal. As a result, by reading the information signal, it is possible to know the number of times of dubbing of the image signal, it is possible to avoid the dubbing operation a predetermined number of times or more, and it is possible to suppress the deterioration of the image signal due to the dubbing process within a predetermined range. Becomes

Further, in the image signal processing device of the present invention, the dubbing number data in the information signal is read by the reading means and the dubbing number data is displayed by the display means. Can be known at a glance, and deterioration of the image signal can be easily suppressed within a predetermined range.

Further, the image signal processing device of the present invention compares the dubbing number data read by the reading means with a predetermined value, and the dubbing operation is prohibited for the image signal having the dubbing number data equal to or more than the predetermined value. Since it is prohibited by the means, the deterioration of the characteristics of the reproduced image is automatically suppressed within a predetermined range.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a block diagram showing a schematic structure of a still video camera to which the present invention is applied, as an embodiment of the present invention.

In FIG. 2, an image pickup circuit 21 is a circuit which forms and outputs a luminance signal Y and color difference signals RY and BY from a signal input from an image pickup element such as a CCD. The output signal of is input to the memory unit 22.

The memory unit 22 converts the luminance signal Y and the color difference signals RY and BY input from the image pickup circuit 21 into digital signals and writes the digital signals in the memory, and also reads the digital signals from the memory and outputs the analog signals. And outputs to the recording circuit 23 and the video output circuit 27. Further, the analog signal input from the reproducing circuit 25 is also converted into a digital signal and stored in the memory.

The recording circuit 23 adds an ID signal formed by frequency-modulating the analog signal input from the memory unit 22 and differential-phase-shift keying modulation of the ID data input from the controller unit 26. And floppy disk 24c
It is output as a recording signal to the disk drive unit section 24.

The disk drive unit section 24 records a changeover switch 24a between the recording operation and the reproduction operation and an output signal of the changeover switch 24a on a video floppy disk 24c, and also the video floppy disk 2
Magnetic head 24c for reading the image signal recorded on 4c
And a motor 24d for driving the magnetic head 24c.

The image signal read from the video floppy disk 24c by the magnetic head 24b of the disk drive unit 24 is input to the reproducing circuit 25 through the changeover switch 24a. The reproduction circuit 25 frequency-demodulates the image signal input from the disc drive unit section 24, differential-phase shift keying demodulation of the ID signal, and inputs them to the memory section 22, the controller section 26 and the video output circuit 27.

The video output circuit 27 outputs the image signal input from the memory section 22 and the display signal input from the reproduction circuit 25 and the controller section 26 to a display device such as a CRT.

Image pickup circuit 21, memory section 22, recording circuit 2
3, the disk drive unit section 24, the reproduction circuit 25, and the video output circuit 27 are supplied with control signals from the controller section 26 for controlling the operations of the respective sections.
Input data input by the user from the keyboard 28 is input to the controller unit 26, and is input to the recording circuit 23 as ID data together with the data created in the controller unit 26. In addition, the controller unit 26
The data and the data input from the keyboard 28 are output to the video output circuit 27.

The solid line in FIG. 2 represents the image signal and the broken line represents the control signal.

Next, the operation of this embodiment will be described.

The electric signal representing the image of the subject inputted from the image pickup device is converted into the image signal of the luminance signal Y and the color difference signals RY and BY in the image pickup circuit 21 and inputted into the memory section 22 to be stored in the memory. It is converted into a digital signal by the unit 22 and stored in the memory.

The digital signal stored in the memory is read by the control signal of the controller section 26 and output to the recording circuit 23. The recording circuit 23 frequency-modulates the image signals read from the memory unit 22 and adds an ID signal formed by differential-phase-shift-keying modulation of the ID data input from the controller unit 26. , To the disk drive unit section 24. The ID data is formed by the controller unit 26 in a format as shown in FIG.

That is, on the time axis shown in FIG.
In the case of the format compatible with the C television system, the starting point 1 of the vertical synchronizing signal (hereinafter, abbreviated as “V.SYNC”) of the image signal is used as a starting point, and the subsequent 28 horizontal synchronizing periods (hereinafter, “H”) Abbreviated) (PAL / SECA
The first 1 bit is I in the period 3 for 4H after the blank period 2 of 28.5H in the case of the format corresponding to the M television system, that is, the CCIR television system.
It is provided as an initial bit indicating the start of D data. Subsequently, 2 bits of the period 4 for 8H are used as a determination signal of whether the recorded image signal is a frame recording image signal or a field recording image signal. In the next period 5 for 28H, a 7-bit area indicating the address of the recording area (track) on the video floppy disk 24c is provided. In a period 6 of 76H after the period 5, a 19-bit area indicating the date when the recording operation is performed is provided. Next period 7 is 1 in the NTSC television system.
It is used for a user area for a period of 08H or 152H in the CCIR television system. As shown in the lower part of FIG. 1 (A), this user area is the first 6
The bit period 7a is used as a mode setting area,
The remaining period 7b is used as a data area. The mode setting area is set as shown in FIG. That is, four types of modes are set by the first 2 bits, and for example, in mode 2, hour, minute, second and numerical data are written subsequently. Further, the mode 3 is the extended mode, and 16 types of modes can be newly set by the remaining 4 bits. In this embodiment, FIG.
As shown in (C), the extension mode is "110001".
6-bit data is set, and in the mode in which this data is set, hour, minute, second, the number of times of dubbing, and numerical data are written in the data area. Thus, the number of times of dubbing data is added to the ID signal.

The image signal and the ID signal input to the disk drive unit section 24 are changed over by the changeover switch 24a.
And recorded on the video floppy disk 24c via the magnetic head 24b. When the image signal from the image pickup circuit 21 is recorded on the video floppy disk 24c, "0" is written in the dubbing number data of the ID data.

In order to carry out a normal reproducing operation from the video floppy disk 24c, the image signal detected by the magnetic head 24b is reproduced by the reproducing circuit 25 through the changeover switch 24a.
The signal is demodulated by and is directly output from the video output circuit 27 to the display device.

To perform the dubbing operation, the image signal output from the disk drive unit section 24 is demodulated by the reproducing circuit 25 and then stored in the memory section 22. The image signal stored in the memory unit 22 is read out to the recording circuit 23, modulated again, and then recorded on the video floppy disk 24c by the magnetic head 24b via the changeover switch 24a. “1” is written as the number of times of dubbing of the ID signal added during this recording. After that, a number according to the number of dubbings is added to the ID signal.

Then, the ID data output from the reproducing circuit 25 during the reproducing operation is supplied to the video output circuit 27, and the video output circuit 27 outputs an image signal in which the contents of the ID signal are multiplexed to the display device to perform dubbing. The number of times will be displayed on the display device.

The controller 26 compares the number of dubbing times of the ID data demodulated by the reproducing circuit 25 with a predetermined value, and when the number of dubbing exceeds a predetermined value, the dubbing operation is prohibited. Is also good. For example, when the predetermined value is set to "3" and the fourth dubbing is prohibited and the dubbing operation of the image signal recorded on the video floppy disk 24c is performed, the dubbing number indicated by the ID data has already been reached. For an image signal that has been repeated three times, a warning is displayed without performing the dubbing operation, or when the order of the image signals recorded on the video floppy disk 24c is changed, I
For a track on which an image signal having the number of times of dubbing indicated by D data of 3 has already been recorded, that track is skipped and editing is performed.

[0030]

According to the image signal processing apparatus of the present invention,
Since the number of times of dubbing is added to the information signal recorded on the recording medium together with the image signal, the number of times of dubbing of the image signal can be known and the dubbing operation more than a predetermined number of times can be avoided. It is possible to suppress the deterioration of the above within a predetermined range.

Further, since the dubbing number data is displayed, the operator can know the dubbing number of the image signal at a glance during the reproducing operation, and the deterioration of the image signal can be easily suppressed within a predetermined range.

Further, with respect to an image signal whose dubbing count data is a predetermined value or more, by inhibiting the dubbing operation, the deterioration of the characteristic of the reproduced image is automatically suppressed within a predetermined range.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an ID signal format of a still video camera as an embodiment of the present invention.

FIG. 2 is a block diagram showing a schematic configuration of a still video camera as one embodiment of the present invention.

[Explanation of symbols]

 7 User Area Period 21 Imaging Circuit 22 Memory Section 23 Recording Circuit 24 Disk Drive Unit Section 25 Playback Circuit 26 Controller Section 27 Video Output Circuit

Claims (3)

[Claims] 1. A recording means for recording an input image signal on a recording medium, a reproducing means for reading and reproducing the image signal recorded on the recording medium, and a control means for controlling the operation of each means. In an image signal processing apparatus provided with, counting means for counting the number of times of dubbing, and data addition for adding the number of times of dubbing counted by the counting means to an information signal to be recorded together with the image signal on the recording medium. An image signal processing device, characterized in that the means is provided in the control means. 2. The image according to claim 1, wherein the control means is provided with a reading means for reading the number-of-times data in the information signal during a reproducing operation, and a display means for displaying the number-of-times data read by the reading means. Signal processing device. 3. A reading means for reading the number-of-times data in the information signal during a reproducing operation, a comparing means for comparing the number-of-times data read by the reading means with a predetermined value, and the number of times compared by the comparing means. The image signal processing apparatus according to claim 1, wherein when the data is equal to or larger than the predetermined value, a prohibiting unit that prohibits a dubbing operation is provided in the control unit.