JP3240132B2 - Image signal processing device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image signal processing device.

2. Description of the Related Art Conventionally, a still video camera and a still video recording / reproducing apparatus have been known as image reproducing apparatuses for recording or reproducing a television signal, for example. In particular, when reproducing a field-recorded image signal in a still video camera having a reproduction function, it is common to generate another field image signal by interpolation and output it as a frame image signal together with the field-recorded image signal. It is a target. The interpolation process at that time is a very simple one such as reproducing one line of the interpolated field interlaced in the next field by averaging a line of the recording field signal and the next line. It is.

On the other hand, an image signal printing device such as a video printer performs more advanced interpolation processing than that of a still video camera, such as applying a high-order digital filter in the vertical direction to the field image signal when printing the field image signal. , Have obtained high quality prints.

[Problems to be Solved by the Invention] As described above, when a field recording image signal output from a still video camera is printed by a video printer, the image signal is output on the printer side rather than using the image signal interpolated on the camera side. It is clear that a higher quality print image can be obtained by performing the interpolation in FIG.

However, the video printer cannot 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 the recording field of the image signal output from the camera is interpolated by the printer and printing is to be performed, in the worst case, the interpolated field of the input image signal to the printer is mistaken for the recording field by the printer, and the field is interpreted. Interpolation processing may be performed originally, and in this case, the image quality of the print image is reduced.

Therefore, an object of the present invention is to provide an image signal processing device which has solved the above-mentioned problems.

[Means for Solving the Problems] To achieve the above object, an image signal processing apparatus according to the first aspect of the present invention provides a field image signal and an interpolated field generated by performing an interpolation process between lines of the field image. Storage means for storing image information composed of image signals, interpolation means for performing an interpolation process different from the interpolation process on the image information, and the field image signal and the interpolated field read from the storage means Control means for supplying only the field image signal of the image signals to the interpolation means, and causing the interpolation means to perform an interpolation process on the supplied field image signal.

An image signal processing apparatus according to a second aspect of the present invention is the image signal processing apparatus according to the first aspect, further comprising printing means for printing out the image signal subjected to the interpolation processing by the interpolation means.

According to a third aspect of the present invention, there is provided an image signal processing apparatus, wherein storage means for storing image information and image information input from an external device are generated by performing an interpolation process between a field image signal and a line of the field image. When one screen is formed with the interpolated field image signal, the control means causes only the field image signal to be stored in the storage means, and the image information stored in the storage means is read out and the interpolation processing is different. Interpolating means for executing an interpolation process.

An image signal processing apparatus according to a fourth aspect of the present invention is the image signal processing apparatus according to the third aspect, further comprising printing means for printing out the image signal subjected to the interpolation processing by the interpolation means.

[Operation] According to the present invention, when the field-recorded image signal is printed with the above configuration, the recorded field signal is always interpolated and printed, so that 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 reproducing apparatus, and the lower side is a printing apparatus. At the time of reproduction, the image signal recorded on the magnetic recording medium 14 is reproduced by the recording / reproducing unit 1, amplified by the amplifier 2, demodulated by the demodulator 3, de-emphasized by the de-emphasis circuit 4, and D
The data is converted into a digital signal by the converter 6. Demodulator 3
Then, the DP code-modulated ID code is also demodulated from the reproduced signal, and the ID code is output to the control unit 12. The control unit 12 uses this ID
By decoding the code, it is possible to determine whether the image signal reproduced from the recording medium 14 is a frame-recorded signal or a field-recorded signal, and the information is displayed on the display device 13. The digitized image signal is stored in an image memory 7
Is stored. However, the write timing of the image memory 7 is controlled by the control unit 12 based on the synchronization signal separated from the reproduction signal after de-emphasis by the synchronization separator 5, and the reproduction image signal is excluded from the blanking period. Only the part having the video information is stored in the image memory.

Further, the control unit 12 performs an interpolation process by the interpolation device 8 when the reproduction signal is a field recording image signal based on the discrimination of the ID code. That is, the interpolation device 8 is controlled by the control unit 12.
And is stored in the image memory 7. The average of the pixel data in a certain line and the data of the adjacent pixels in the next line is calculated, and the average is sequentially stored in the empty address of the image memory 7 as pixel data to be interlaced in the next field of the stored field signal. Write. Therefore, in this case, the data of the recording field and the data of the interpolated field are sequentially stored in the physical address of the image memory 7 from the top. When the reproduction signal is a frame recording image signal, the image memory 7 stores the image signal data of the odd field and the even field from the top 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 becomes an analog signal again by the D / A converter 9, and becomes a TV signal by the encoder 11. In the encoder 11, the synchronization signal generated from the synchronization signal generator 10 is also added to the signal from the D / A converter 9, and its timing is also controlled by the control unit 12.

An example in which an image signal field-recorded on the magnetic recording medium 14 in the even field in this reproducing apparatus is reproduced will be described. FIG. 2 is a time chart thereof. As the image field-recorded in the even field, there are a case where the field is originally recorded in the even field and a case where the odd field of the frame-recorded image signal is deleted.

FIG. 2 shows an even field recorded image signal, an odd field of an output signal from the reproducing apparatus, and an even field from the top. By controlling the read timing of the image memory 7 and the synchronous signal generation timing of the synchronous signal generator 10 by the control unit 12,
In the odd field, a signal in which the content of the recording signal is advanced by 1/2 horizontal period is output. In the even field signal, the content interpolated by averaging two adjacent lines of the recording signal is compared with the preceding line of the two lines. The signals of the same timing state are output. As is apparent from FIG. 2, when reproducing the image signal recorded in the field, the reproducing device controls the timing of reading from the memory 7 and the timing of generating the synchronizing signal from the synchronizing signal generator. In any case, the recording signal is output to the odd field and the interpolated signal is output to the even field.

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

Here, the image memory 19, the interpolation device 20, the compression correction device 21,
The operations of the driver 22 and the printer unit 23 are controlled by the control unit 24. The control unit 24 selects, using a print mode changeover switch (SW) 25, a frame mode: printing based on a frame image signal or a field mode: printing based on a field image signal. When the frame mode is selected by the SW 25, the control unit 24 stores the frame information (image signal) in the image memory 19.
Then, the interpolation device 20 performs an interpolation process for the frame signal. When the field mode is selected, the image data recognized as the odd field by the discriminator 17 is loaded into the image memory 19, and the interpolation device 20 performs an interpolation process for a field signal. A case in which a reproduced image of a field recording signal is printed in the above still video system will be described.

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

Since the user can recognize that the field recorded image is being reproduced, the user selects the field mode by the print mode switch SW25 of the printing apparatus and prints. Since the printing device is in the field mode, odd
An image signal of a field, that is, a recording field, is stored in the image memory 19, and interpolation is performed for a field signal based on the data, and then printing is performed.

Also, instead of providing the printer with the print mode switch SW25, it is considered effective to provide communication means between the playback device and the printing device regarding whether the playback image signal is a field signal or a frame signal. Can be

[Effects of the Invention] As described above, according to the present invention, for an interpolation image,
Further, it is possible to prevent the image quality from being deteriorated by performing the interpolation processing.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a view showing a timing chart of a reproducing apparatus output when reproducing a field recording signal of an even field. Reproducing device 1: Recording / reproducing unit, 2: Amplifier, 3: Demodulator, 4: De-emphasis, 5: Synchronous separator, 6, A / D converter, 7, Image memory, 8 ... ... interpolator, 9 ... D / A converter, 10 ... synchronous signal generator, 11 ... encoder, 12 ... controller, 13 ... display, 14 ... magnetic recording medium. Printing equipment 15 Interface 16 Synchronous separator 17 Discriminator 18 A / D converter 19 Image memory 20 Interpolator 21 Compression corrector 22 ... Driver, 23 ... Printer, 24 ... Control, 25 ... Print mode switch.

Continuation of the front page (72) Inventor Tsutomu Takayama 3-30-2 Shimomaruko, Ota-ku, Tokyo Within Canon Inc. (56) References JP-A-1-274574 (JP, A) (58) Fields investigated ( Int.Cl. ⁷ , DB name) H04N 5/91 H04N 7/01

Claims (4)

(57) [Claims] A storage means for storing image information composed of a field image signal and an interpolated field image signal generated by interpolating between lines of the field image; An interpolating means (20) for executing an interpolating process different from the interpolating process, and supplying only the field image signal of the field image signal and the interpolated field image signal read from the storage device to the interpolating device. Control means (24) for performing an interpolation process on the supplied field image signal by an interpolation means. 2. The image signal processing apparatus according to claim 1, further comprising a printing unit (23) for printing out an image signal interpolated by said interpolation unit. 3. A storage means (19) for storing image information, wherein the image information input from an external device is a field image signal and an interpolated field generated by performing an interpolation process between lines of the field image. A control means (24) for storing only the field image signal in the storage means when one screen is composed of image signals, and an image processing apparatus which reads out image information stored in the storage means and performs interpolation different from the interpolation processing An image signal processing device comprising: an interpolation unit (20) for executing a process. 4. The image signal processing apparatus according to claim 3, further comprising printing means (23) for printing out an image signal interpolated by said interpolation means.