JPH04111690A - Picture signal processor - Google Patents

Abstract

PURPOSE:To obtain a print picture with high picture quality by outputting one field as a recording field at all times as a reproduced output signal when a field recording picture signal is printed out. CONSTITUTION:At first a reproduction device outputs a signal of a recording field for an odd number field and outputs a signal of a field to be interpolated for an even number field. Then an indication of a field recording picture is displayed on a display device 13. Since the user recognizes the reproduction of the field recording picture, the user uses a print mode changeover switch SW 25 of a printer to select the field mode and the picture is printed out. Since the printer is in the field mode, a picture signal of an odd number field, that is, the recording field is stored in a picture memory 19, and interpolation processing for the field signal is implemented based on the data and then the picture is printed out.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an image signal processing device.

[Prior Art] Still video cameras and still video recording and reproducing devices are conventionally known as image reproducing devices that record or reproduce television signals, for example. In particular, when playing back a field-recorded image signal in a still video camera that has a playback function, it is common to create another field image signal through interpolation processing and output it together with the field-recorded image signal as a frame image signal. It is true. The interpolation process at this time is very simple, such as reproducing one line of the interpolated field that is incremented in the next field by taking the average of one line of the recording field signal and the next line. It is.

On the other hand, when recording signal printing devices such as video printers print field image signals, they perform interpolation processing that is more advanced than that of still video cameras, such as applying a vertical high-order digital filter to the image signals. You are getting high quality prints.

[Problems to be Solved by the Invention] When printing a field recording image signal output from a still video camera as described above using a video printer, it is preferable to print the image signal on the printer side rather than using an image signal interpolated on the camera side. It is clear that a higher quality print image can be obtained by interpolating the image.

However, with a video printer, it is not possible to recognize which of the two fields of the frame image signal output from the camera is the originally recorded field and which is the interpolated field.

Therefore, when trying to interpolate and print the recording field of the image signal output from the camera by the printer, in the worst case, the printer mistakes the interpolated field of the input image signal to the printer for the recording field and prints that field. Interpolation processing may be performed on the original image, and in this case, the quality of the printed image deteriorates.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an image signal processing device that solves the above problems.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a reproducing means for reproducing an image signal from a recording medium, and a method for determining whether the reproduced image signal from the reproducing means is a field, the other, or a frame recording signal. a first discriminating means for discriminating; an accumulating means for accumulating the reproduced image signal; and when the first discriminating means determines that the reproduced image signal is a field or the other, the field or the other is interpolated and stored in the accumulating means. It is characterized by comprising a first interpolation means for accumulating, and an output means for always outputting the reproduced image signal to one field and the interpolated signal to the other field from the accumulation means, and further, the image signal is a second determining means for determining whether the image signal is a field or the other field; a second determining means for determining whether the image signal is a field or the other field; and a second determining means for determining whether the image signal is a field or the other field; In this case, the present invention is characterized by comprising an interpolation means for interpolating both field recording signals, and means for printing the recording signal after interpolation by the interpolation means.

Ru.

[Function] According to the present invention, with the above configuration, when printing a field-recorded image signal, the recorded field signal is always interpolated and printed, so a high-quality print image can be obtained.

[Embodiment] FIG. 1 shows a still video system according to an embodiment of the present invention. In FIG. 1, the upper side is a reproduction device, and the lower side is a printing device. During reproduction, the image signal recorded on the magnetic recording medium 14 is reproduced by the recording/reproducing section 1, amplified by the amplifier 2, demodulated by the demodulator 3, de-emphasized by the de-emphasis circuit 4, and then
The D converter 6 converts the signal into a digital signal. Note that the demodulator 3 also demodulates the DPSK-modulated ID code from the reproduced signal, and outputs the ID code to the control section 12. The control unit 12 can decode this ID code and determine whether the image signal reproduced from the recording medium 14 is a frame-recorded signal or a field-recorded signal, and displays this information on the display device 13. . The digitized image signal is stored in the image memory 7. However, the writing timing of the image memory 7 is controlled by the control unit 12 based on the synchronization signal separated from the reproduced signal after de-emphasis by the synchronization separator 5, and the write timing of the image memory 7 is controlled by the control unit 12 based on the synchronization signal separated from the reproduced signal after de-emphasis by the synchronization separator 5. (Only the portion with video information is stored in the image memory.

Further, the control unit 12 determines the ID code and, if the reproduced signal is a field recording image signal, causes the interpolation device 8 to perform interpolation processing. That is, the interpolation device 8 is controlled by the control unit 12 and is stored in the image memory 7.
The pixel data in a certain line and the data of adjacent pixels in the next line are averaged, and this is sequentially stored in empty addresses in the image memory 7 as pixel data to be incremented in the next field of the stored field signal. Write. Therefore, in this case, the data of the distribution field and the interpolated field are sequentially stored in the physical address of the image memory 7 from the top. In addition, if the playback signal is a frame recording image signal, the image memory 7 is
The dd field and even field recording signal data are stored in order.

The read timing of the image memory 7 is controlled by the control unit 12, and the image data read from the image memory 7 is converted into an analog signal again by the D/A converter 9.
The encoder 11 converts the signal into a TV signal. Encoder 11
Then, the synchronization signal generated from the synchronization signal generator lO is also D/
Although it is added to the signal from the A converter 9, its timing is also controlled by the control section 12.

An example will be described in which this reproducing apparatus reproduces an image signal recorded on the magnetic recording medium 14 in an even field. Figure 2 is the time chart. Note that images that are field-recorded using even fields include cases where the field recording was originally performed using even fields, and cases where the odd field of an image signal recorded in a frame has been erased.

From the top, Figure 2 shows the even field recorded image signal, the odd field of the output signal from the playback device, and the same (even field) recording image signal.
It represents n fields. By controlling the read timing of the image memory 7 and the synchronization signal generation timing of the synchronization signal generator 1O by the control unit 12, the content of the other field in the odd field is set to 17 with respect to the reference time.
A signal in a state advanced by two horizontal periods is output, and in the case of an even field signal, a signal whose timing is the same as the preceding line of the two lines is outputted by interpolation by averaging the other two adjacent lines. As is clear from FIG. 2, when the playback device plays back the field-recorded image signal, the control unit 12 controls the readout timing from the memory 7 and the synchronization signal generation timing from the synchronization signal generator. ,in any case,
The interpolated signal is output to either the odd field or the even field.

Ru.

On the other hand, in the printing device shown on the lower side of FIG. 1, the image signal input from the reproduction device is converted into a digital signal by the A/D converter 18 via the interface 15. A synchronization separator 16 separates a synchronization signal from the signal of the interface 15, and a discriminator 17 determines whether the image signal is an odd field or an even field based on the synchronization signal, and the information is output to the control unit 24. Ru. A/
The image signal converted into a digital signal by the D converter 18 is temporarily stored in the image memory 19, and then transferred to the interpolation device 20.
is output to. The interpolation device 20 performs advanced processing such as applying a high-order digital filter to the image signal under the control of the control unit 24 to interpolate pixel data between lines of the TV signal. The interpolated data from the interpolation device 20 is subjected to dynamic range compression and data correction by the compression correction device 21 to match the characteristics of the printing method, ink, etc. Then, based on the data from the compression correction device 21, the driver 22 operates the printer section 23 to perform printing.

Here, the image memory 19. Interpolator 20. Compression correction device 21. Driver 22. The operation of the printer section 23 is controlled by a control section 24. The control unit 24 uses a print mode changeover switch (SW) 25 to select ■Frame mode: whether to print based on a frame image signal;
■Field mode: Select whether to print based on field image signals. When the frame mode is selected by 5W25, the control unit 24 loads frame information (image signal) into the image memory 19, and the interpolation device 20 performs interpolation processing for the frame signal. Further, when the field mode is selected, the discriminator 17
Image data recognized as a field is taken into the image memory 19, and an interpolation device 20 performs interpolation processing for field signals. In the still video system described above, a case will be described in which a reproduced image of one field or the other is printed.

First, the reproducing device outputs the signal of the recording field to the odd field and the signal of the supplemented field to the even field. Then, the display device 13 displays that it is a field recorded image.

Since the user can recognize that a field recorded image is being reproduced, the user selects the field mode by the print mode switching 5W25 of the printing device and prints. Since the printing device is in field mode, o
The dd field, that is, the recording field recording signal, is stored in the image memory 19, and based on the data, interpolation processing for the field signal is performed and then printed.

Furthermore, instead of providing the print mode switching 5W25 in the printer, it may be effective to provide a communication means between the reproduction device and the printing device to determine whether the reproduced image signal is a field signal or a frame signal. .

[Effects of the Invention] According to the present invention, when printing a field recorded image signal, one field (for example, an odd field) is always output as a recording field as a reproduction output signal,
When printing, in the case of a field distribution signal, only one field's data is always used for interpolation processing and printing, so there is no confusion between the recorded field and the interpolated field in the playback output signal, and a high level of interpolation is possible. Since it becomes possible to perform processing, high-quality print images can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
FIG. 7 is a diagram showing a timing chart of the output of the reproducing device when one or the other of n fields is reproduced. Reproducing device 1... Recording and reproducing section, 2... Amplifier, 3... Demodulator, 4... De-emphasis, 5... Sync separator, 6... A/D converter, 7. ...Image memory, 8.Interpolation device, 9.D/A converter, 10.Sync signal generator, 11.Encoder, 12.Control unit, 13.Display device , 14... Magnetic recording medium. Printing device 15...Interface, 16...Sync separator, 17...Discriminator, 18...A/D converter, 19...Image memory, 20...Interpolation device, 21... - Compression correction device, 22... Driver, 23... Printer section, 24... Control section, 25... Print mode SW.

Claims (1)

[Scope of Claims] 1) Reproducing means for reproducing an image signal from a recording medium, first determining means for determining whether the reproduced image signal from the reproducing means is a field recording signal or a frame recording signal, and the reproduced image signal a first interpolating means for interpolating the field recording signal and storing it in the accumulating means when the reproduced image signal is a field recording signal as determined by the first discriminating means; 1. An image signal processing device comprising output means for always outputting a reproduced image signal to one field and an interpolated signal to the other field. 2) a second discrimination means for discriminating whether the image signal is one field or the other field; and when the image signal is a field recording signal, interpolation processing is performed from the image signal of one field based on the discrimination by the second discrimination means; and, when the image signal is a frame recording signal, an image comprising interpolation means for performing interpolation processing from the image signals of both fields, and means for printing the image signal after interpolation by the interpolation means. Signal processing device.