JPH0856329A - Wide aspect video signal recording method and magnetic recording / reproducing apparatus using the same - Google Patents

Abstract

(57) [Abstract] [Purpose] To improve the image quality of a reproduced image when a wide video signal is recorded in a consumer VTR. [Structure] A wide video signal is compressed to a recordable band in a recording system. In this case, the compression rate is determined based on the horizontal and vertical high frequency components of the wide video signal. For example, when there are more horizontal high frequency components than vertical high frequency components, the compression rate in the vertical direction is set higher than the compression rate in the horizontal direction. Further, after being converted into a format suitable for the recording system, it is given to the recording system for recording. As a result, for example, a wide image can be recorded even in a consumer VTR, and since compression according to the image quality is performed, it is possible to suppress deterioration of the image quality of the reproduced image.

Description

Detailed Description of the Invention

[Object of the Invention]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wide aspect video signal recording method suitable for recording and reproducing a second generation EDTV signal and a magnetic recording / reproducing apparatus using the same.

[0002]

2. Description of the Related Art In recent years, second-generation EDTV (Extended Definition TV) broadcasting aimed at high image quality and high sound quality has been studied. Second-generation EDTV broadcasting is compatible with current broadcasting and has a screen aspect ratio of 1
The horizontal aspect ratio of 6: 9 makes it possible to watch programs with a realistic feel. The effective scanning lines of the second-generation EDTV signal (wide aspect television signal) correspond to the 16: 9 portion of the current NTSC signal having an aspect ratio of 4: 3, where the number of scanning lines at the vertical center is 360. .

In the second generation EDTV system, a progressive scanning signal of 480 lines / screen height is converted into an interlaced scanning signal and transmitted on the transmitting side. In this case, the number of effective scanning lines is 3
In order to make 60 lines, the luminance signal of 480 lines / screen height is band-limited to the signal of 360 lines / screen height by the vertical low pass filter. Further, in order to convert to the interlaced scanning signal, the luminance signal is band-limited to the signal of 180 lines / screen height by the vertical low pass filter. The band limitation prevents the generation of aliasing distortion at the time of scanning line conversion. The component YL of 4.2 MHz or less in the horizontal low range of the luminance signal of 180 lines / screen height is transmitted as the main image portion signal. Further, a temporal vertical high frequency component (VT signal) of 180 to 360 lines / screen height which is lost due to band limitation during conversion from progressive scanning to interlaced scanning is transmitted as a vertical reinforcement signal.

The main picture portion signal and the VT signal are SSK
Separated by F (Symmetric Short Kernel Filter). As SSKF, a 3-tap or 5-tap filter is used. In addition, a vertical high-frequency component (VH signal) of a luminance signal of 360 to 480 lines / screen height, which is lost due to band limitation during conversion to the letterbox format, is also transmitted as a vertical reinforcement signal. These components VH and VT are added according to the movement of the image and compressed to 1/3 in the horizontal direction (time direction). In this case, in order to separate the VT signal and the VH signal on the receiving side, the VH signal is line-inverted to shift by 15 Hz in the time axis direction and then V
Add with T signal. Next, the added signal is modulated using the color subcarrier, band limited using the Nyquist filter, and multiplexed in the non-image areas at the top and bottom of the screen. In order to prevent the vertical reinforcement signal of the non-image portion from standing out on the screen, a component having a correlation with the VT signal is generated from the main image portion signal, and after subtracting this component from the VT signal, it is converted into the VH signal. It is designed to add.

Further, the component YH in the band of 4.2 to 6 MHz in the horizontal high range of the luminance signal of 180 lines / screen height is multiplexed as the horizontal reinforcement signal HH on the main picture portion signal. In this case, the frequency of the horizontal high frequency component YH is 16
The carrier suppression amplitude modulation is performed using the carrier of / 7fsc (fsc is a color subcarrier frequency), and the frequency is further shifted and frequency-multiplexed with the main picture portion signal.

At the receiving side, at the time of decoding, the horizontal reinforcing signal HH and the vertical reinforcing signals VH and VT are demodulated and added to the main image portion signal having 360 effective scanning lines to reproduce the image. By decoding the second-generation EDTV signal and displaying it on a monitor having an aspect ratio of 16: 9, a high-resolution image of effective pixels 960 × 480 lines can be obtained.

By the way, it may be considered to record a video signal after decoding the second generation EDTV signal (hereinafter referred to as a wide video signal) by a consumer VTR (video tape recorder). The VTR for current broadcasting can record a video signal having a resolution satisfying CCIR recommendation 601, that is, a resolution of 720 pixels × 480 lines. In addition, V compatible with the current television system
The TR is configured in consideration of recording a video signal having an aspect ratio of 4: 3. Therefore, the wide video signal is used for consumer V
When recording in TR, it is necessary to limit the number of pixels in the horizontal direction to 720 pixels, and also to limit the number of pixels in the vertical direction in order to keep the roundness at 1.

FIG. 4 is an explanatory diagram for explaining a recorded image when a wide video signal is recorded on a consumer VTR.

As shown in FIG. 4 (a), the aspect ratio of the wide image based on the wide video signal is 16: 9.
As shown in FIG. 4 (b), by making the upper and lower parts of the screen of this wide image a non-image part to form a letterbox screen,
The aspect ratio of the wide video signal is converted to 4: 3. The video signal of this letterbox screen is recorded on a consumer VTR.

However, in this case, the number of pixels in the vertical direction is 480 pixels including the non-image portion, the number of effective pixels is small, and the resolution is deteriorated.

Further, the aspect ratio of a wide image is 4: 3.
A technique for recording by considering this is disclosed in Japanese Patent Laid-Open No. 5-211667. FIG. 5 is an explanatory diagram for explaining a recorded image in the proposed "magnetic recording / reproducing apparatus for wide aspect ratio video signal".

FIG. 5A shows a wide image based on a wide video signal having an aspect ratio of 16: 9. By setting only the image of the aspect ratio of the center of the wide image in the left-right direction of 4: 3 as the recorded image (see FIG.
(B)) Enables recording on a consumer VTR. Also,
In order to set the aspect ratio to 4: 3, the image may be compressed and recorded in the left-right direction as shown in FIG. The aspect ratio of the compressed image in FIG.
When displayed on a monitor of 6: 9, an image having a circularity of 1 can be displayed.

However, in these systems, the image is compressed in the left-right direction. That is, by deleting the horizontal high frequency component of the wide video signal, it is possible to record on a consumer VTR, and the resolution in the horizontal direction deteriorates.

In recent years, a digital VTR capable of digital recording has been developed. FIG. 6 is a block diagram showing a conventional magnetic recording / reproducing apparatus of this type that enables high-quality recording for a long time by adopting high-density recording and high-efficiency encoding.

The analog input video signal is a video processing circuit 5
Give to. The video processing circuit 5 converts the input video signal into a digital signal and frames it. The video signal from the video processing circuit 5 is separated into a luminance signal component and a color difference signal component for processing. It should be noted that FIG. 6 shows only the luminance signal component for simplification of description.

The image processing circuit 5 divides the framed image signal into blocks of 8 pixels × 8 lines (DCT blocks), shuffles the blocks, and supplies them to the DCT circuit 6. The DCT circuit 6 performs a two-dimensional DCT (discrete cosine transform) process on the block data from the video processing circuit 5 to transform the spatial coordinate axis component into a frequency axis component. The transform coefficient from the DCT circuit 6 is given to the quantizing circuit 7 and quantized by using a predetermined quantizing coefficient. In this case, considering the human visual characteristics, the quantization coefficient is set larger for the higher frequency component of the transform coefficient. This allows
Reduces signal redundancy.

The output of the quantization circuit 7 is a variable length coding circuit 8
The variable-length coding circuit 8 gives a predetermined variable-length code table,
For example, the quantized output is variable-length coded based on the Huffman code table and output to the error correction coding circuit 9. This assigns short bits to data with a high probability of occurrence,
Longer bits are assigned to the data having a low appearance probability to further reduce the transmission amount.

The encoded output from the variable length encoding circuit 8 is designed to have a fixed length in consideration of special reproduction and the like. This fixed length is performed, for example, in macroblock units. Due to the difference in sampling clocks between the color difference signal and the luminance signal, the sizes of the luminance block and the color difference block are different. For example, if the sampling clock of the color difference signal has a frequency of 1/4 of the sampling clock of the luminance signal, the size ratio of the luminance block and the color difference block is 1: 4. In this case, a macroblock is composed of 6 DCT blocks including 4 blocks for luminance and 1 block for each color difference, and is used as a unit for encoding. Then, for example, by fixing the length to 5 macroblocks at discrete positions on the screen, the code amount is appropriately assigned regardless of the pattern.

On the other hand, the input voice signal is given to the voice processing circuit 11. The audio processing circuit 11 A / D-converts the input audio signal, synchronizes it with the video signal, performs mixing processing, and outputs it to the error correction encoding circuit 9. The error correction encoding circuit 9 encodes the compressed video data and audio data into a product code such as a Reed-Solomon code, and outputs the product code to the modulation circuit 10. The modulation circuit 10 modulates the input data by a modulation method suitable for high density recording and records it on the magnetic tape 12 via a magnetic head (not shown).

At the time of reproduction, reproduction data from the magnetic tape 12 is given from the magnetic head to the demodulation circuit 13. Demodulation circuit
Reference numeral 13 demodulates the reproduced data, and the demodulated data is subjected to error correction processing by the error correction decoding circuit 14. The video data from the error correction decoding circuit 14 is given to the variable length decoding circuit 15,
The audio data is given to the audio processing circuit 16. The variable length decoding circuit 15 variable length decodes the video data and supplies it to the inverse quantization circuit 17, and the inverse quantization circuit 17 inversely quantizes the variable length decoding output and supplies it to the inverse DCT circuit 18. The inverse DCT circuit 18 performs inverse DCT processing on the input data, expands the original coordinate axis data before DCT processing, and outputs it to the video processing circuit 20.

The video processing circuit 20 deshuffles the decompressed data in the frame to restore the original data array and D / A converts it to obtain an analog output video signal. On the other hand, the audio data from the error correction decoding circuit 14 is given to the audio processing circuit 16, and after time adjustment with the video signal and correction processing, D / A conversion is performed to obtain an analog output audio signal.

The consumer VTR shown in FIG. 6 also has a structure suitable for recording the current NTSC signal having an aspect ratio of 4: 3. Therefore, when a wide video signal obtained by decoding the second generation EDTV broadcast signal is given as the input video signal, even horizontal and vertical high frequency components cannot be reliably recorded, and the resolution of the reproduced image is reduced. There was a problem of deterioration.

[0023]

As described above, in the above-described conventional magnetic recording / reproducing apparatus, when recording a wide video signal, the horizontal or vertical high frequency component is lost, and the resolution of the reproduced image deteriorates. There was a problem that it would end up.

The present invention provides a wide aspect video signal recording method capable of suppressing deterioration of image quality of a reproduced image by changing the recording screen size according to the resolution of the wide image, and a magnetic recording / reproducing apparatus using the same. The purpose is to provide.

[Constitution of the Invention]

According to a wide aspect video signal recording method of a first aspect of the present invention, an input video signal having a wider band than a recordable band of a recording system is input, and the horizontal height of the input video signal is increased. A step of detecting the band component and the vertical high band component, and compressing the horizontal band and the vertical band of the input video signal respectively with the horizontal compression ratio and the vertical compression ratio based on the detection result of the horizontal high band component and the vertical high band component. The present invention comprises a compression procedure for changing the recording band to a band recordable by the recording system, and a step for recording the compressed video signal after the format conversion corresponding to the recording format of the recording system. The wide aspect video signal recording method according to claim 2, wherein the horizontal high frequency component and the vertical high frequency component are detected from the input video signal in which the horizontal high frequency component and the vertical high frequency component are multiplexed. A band in which the input video signal can be recorded by a recording system by reinforcing the horizontal band and the vertical band of the input video signal with a horizontal reinforcement factor and a vertical reinforcement factor based on the detection result of the horizontal high frequency component and the vertical high frequency component, respectively. The magnetic recording / reproducing apparatus according to claim 3 of the present invention is provided with a reinforcing procedure for extending the recording signal to the recording system of the recording system, and a procedure for recording after the format conversion of the reinforced video signal corresponding to the recording format of the recording system. Magnetic recording / reproducing means for magnetically recording the input signal on a predetermined magnetic recording medium, horizontal high-frequency component detecting means for detecting a horizontal high-frequency component when a wide-aspect video signal is input, and the wide-aspect video signal is input Vertical high-frequency component detecting means for detecting the vertical high-frequency component,
A mode determination unit that sets a mode based on the detection result of the horizontal and vertical high frequency component detection unit, and compresses the wide aspect video signal at a compression ratio of horizontal and vertical bands according to the mode set by the mode determination unit. And a format conversion means for converting the output of the compression means into a format corresponding to a predetermined recording format and giving it to the magnetic recording and reproducing means. Is something
According to a ninth aspect of the present invention, there is provided a magnetic recording / reproducing apparatus for magnetically recording an input signal on a predetermined magnetic recording medium, and a wide aspect image in which a horizontal high frequency component and a vertical high frequency component are multiplexed. A horizontal high frequency component detecting means for receiving a signal and detecting the horizontal high frequency component; a vertical high frequency component detecting means for receiving the wide aspect video signal and detecting the vertical high frequency component; A mode determining means for setting a mode based on the detection result of the component detecting means, and the magnetic recording / reproducing means for reinforcing the wide aspect video signal with a reinforcement ratio of horizontal and vertical bands according to the mode set by the mode determining means. Reinforcing means for changing to a recording band of the recording medium, and the output of the reinforcing means is converted into a format corresponding to a predetermined recording format and given to the magnetic recording / reproducing means. It is obtained by and a formatting converter.

[0026]

According to the first aspect of the present invention, the compression ratios of the horizontal and vertical bands of the input video signal are determined by the detection result of the procedure for detecting the horizontal and vertical high frequency components of the input video signal. For example, when the input video signal has many horizontal high frequency components, the compression rate of the vertical band is set higher than that of the horizontal band. As a result, compression is performed while suppressing deterioration of resolution. Next, the compressed video signal is format-converted according to the recording format of the recording system and then recorded. Thus, the input video signal having a wider band than the recordable band in the recording system is recorded while suppressing the deterioration of the image quality to the minimum.

In the second aspect of the present invention, in the reinforcement procedure, the reinforcement is performed at the horizontal reinforcement rate and the vertical reinforcement rate according to the detection result of the horizontal and vertical high frequency components of the input video signal. For example, when the input video signal has many horizontal high frequency components, the horizontal reinforcement rate is set higher than the vertical reinforcement rate. In this way, the reinforcement for maximizing the image quality improvement is performed to improve the image quality of the reproduced image.

In the third aspect of the present invention, the horizontal and vertical high frequency components of the wide aspect video signal are detected by the horizontal high frequency component detection means and the vertical high frequency component detection means.
The mode determination means sets the mode based on the detection result, and the compression means compresses the wide aspect video signal at the compression ratios in the horizontal and vertical bands according to the mode. As a result, it is possible to perform compression with a minimum deterioration in image quality. The compressed video signal is converted into a recording format by the format conversion means and recorded on the magnetic recording medium by the magnetic recording / reproducing means. Since the compression is performed in the mode according to the horizontal and vertical high frequency components, the quality of the reproduced image is improved.

In claim 9 of the present invention, the reinforcing means is:
A wide aspect video signal is reinforced with a reinforcement ratio of horizontal and vertical bands according to a mode based on a horizontal high frequency component and a vertical high frequency component. As a result, the optimum reinforcement according to the image quality is performed, and the magnetic recording / reproducing device records in a state in which the image quality of the reproduced image is maximized.

[0030]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing an embodiment of a wide aspect video signal recording method according to the present invention. FIG.
1A shows a wide image, and FIGS. 1B1 to 1B4.
Indicates a portion of the wide image to be recorded, and FIG.
1) to (c4) show recorded images corresponding to FIGS. 1 (b1) to (b4), and FIG. 1 (d) shows a block configuration of the recorded images.

For example, assume that a wide image of horizontal 960 pixels × vertical 480 lines shown in FIG. 1A is recorded. In this case, in the recording system, the aspect ratio is 4: 3, which is 7
It is assumed that a video signal of 20 pixels × 480 lines can be recorded. In the present embodiment, the wide image is compressed according to the horizontal and vertical high frequency components of one frame of the wide image, thereby making it possible to perform recording while suppressing the image quality deterioration of the reproduced image.

That is, it is assumed that a wide image has a horizontal high frequency component and no vertical high frequency component. In this case, the wide image is thinned out in the vertical direction to reduce the number of pixels. For example, if the pattern of the wide image is vertical stripes, the image quality does not deteriorate even if the image is thinned out in the vertical direction. Similarly, when the wide image does not have the horizontal high frequency component but has the vertical high frequency component, the wide image is compressed in the horizontal direction to reduce the number of pixels. For example, if the pattern of the wide image has horizontal stripes, the image quality does not deteriorate even if the image is thinned out in the horizontal direction.

For the same reason, the compression is performed in the horizontal and vertical directions according to the horizontal and vertical high frequency components of the wide image.
FIG. 1 shows an example in which four types of compression are performed according to the horizontal and vertical high frequency components. That is, FIG. 1 (b1) shows the compression in the case of not having the vertical high range but having the horizontal high range, and showing that the number of lines in the vertical direction is thinned out from 480 to 360. There is. Also, FIG. 1 (b4) shows compression in the case of not having a horizontal high range but having a vertical high range, and that the number of pixels in the horizontal direction is thinned from the original 960 to 720. Shows. In addition, FIG. 1 (b2), (b
3) shows the case where both the horizontal high range and the vertical high range are included. FIG. 1 (b2) shows many horizontal high range components, and FIG. 1 (b3) shows an example with many vertical high range components. In FIG. 1B2, the image is converted into an 864 × 400 image by thinning out the horizontal and vertical sides of the image. Further, FIG. 1 (b3) is compressed into an 800 × 432 image. In each of these compression methods, the number of pixels after compression is set to 345600 (= 720 × 480).

Next, the compressed image has an aspect ratio of 4:
3 to the screen size of 720 × 480 lines. For example, in the example of FIG. 1 (b1), 240 pixels × hatched
If the DCT processing is performed in a unit of 360 lines, that is, a block unit of 8 × 8 pixels, 30 × 45 DCT
The block portion is moved and arranged at the position of the 90 × 15 DCT block as shown by the hatched portion in FIG. 1 (c1). Similarly, in the example of FIG. 1B2, a portion of 144 pixels × 400 lines indicated by diagonal lines, that is, 18 × 50D
The portion of the CT block is moved and placed at the position of the 90 × 10 DCT block as shown by the hatched portion in FIG. 1 (c2). Further, in the example of FIG. 1 (b3), a portion of 80 pixels × 432 lines indicated by diagonal lines, that is, a portion of 10 × 54 DCT blocks is moved to 90 × as shown by the shaded portion of FIG. 1 (c3). It is placed at the position of the 6DCT block.

By these movements, one frame is moved to 72
0 × 480 pixels = 90 × 60 DCT blocks. In the example of FIG. 1 (b4), it is not necessary to move the block. Thus, the recorded image shown in FIG. 1D is formed.

The recorded image shown in FIG. 1D is given to a consumer digital VTR to be recorded. As described above, the consumer digital VTR is capable of recording an image of 720 pixels × 480 lines, and the recorded image of FIG. 1 (d) is given as it is to record without suppressing the high frequency component. It is possible.

Next, the operation of the embodiment thus constructed will be described.

In this embodiment, the wide image is compressed up to the recordable band in the recording system. In this case, in order to determine the compression method, first, the horizontal and vertical high frequency components of the wide image are detected. The horizontal high frequency component and the vertical high frequency component of one frame are compared, and the compression rate in the horizontal direction and the compression rate in the vertical direction are determined according to the comparison result. The smaller the high frequency component is, the larger the compression rate is, and the number of pixels after compression is reduced to the number of pixels that can be recorded by the recording system.

Next, for example, by performing thinning according to the obtained compression ratio, the wide image is compressed frame by frame as shown in FIGS. 1 (b1) to (b4). In FIG. 1, compression is performed in consideration of the size of a processing block (DCT block) in high efficiency encoding.

Next, the arrangement of DCT blocks is changed according to the recording format of the recording system. As a result, as shown in FIGS. 2 (c1) to (c4), images in any of the formats shown in FIGS. 1 (b1) to (b4) are converted into the same format. That is, these images are the current N
It can be recorded by a consumer VTR compatible with the TSC system.

As described above, in the present embodiment, when the wide image is compressed to a recordable band in the recording system, the compression is performed according to the horizontal and vertical high frequency components, and the image quality is deteriorated by the compression. Can be minimized.

It is possible to reproduce the original wide screen at the time of reproduction by transmitting the information regarding the arrangement change of the DCT block and recording it in the subcode area of the VTR, for example.

FIG. 2 is a block diagram showing an embodiment of the magnetic recording / reproducing apparatus according to the present invention. The present embodiment employs the wide aspect video signal recording method of FIG.

In FIG. 2, a wide aspect video signal is applied to the input terminal 21 as an input video signal. This input video signal is, for example, a wide video signal obtained by decoding the received second generation EDTV signal. This input video signal is a horizontal reinforcement signal detection circuit 22 and a vertical reinforcement signal detection circuit 23.
Give to.

The horizontal reinforcement signal detection circuit 22 detects the horizontal high frequency component of the wide video signal based on the horizontal reinforcement signal, for example. As described above, the main picture part signal of the second generation EDTV signal is a component of 4.2 MHz or less in the horizontal low range, corresponds to the horizontal resolution of 720 pixels, and the horizontal reinforcement signal is the horizontal high range of the luminance signal. It is a component in the band of 4.2 to 6 MHz and corresponds to a horizontal resolution of 720 to 960 pixels. Therefore, the horizontal reinforcement signal detection circuit 22 detects the horizontal reinforcement signal, whereby the horizontal high frequency component of the wide video signal can be detected. The horizontal reinforcement signal detection circuit 22 outputs the detection result to the mode determination circuit 24 as a horizontal high frequency signal.

Further, as described above, the vertical reinforcement signal is
The vertical reinforcement signal detection circuit 23 is composed of 360 to 480 lines / screen height luminance signal vertical high-frequency component (VH signal) and 180 to 360 lines / screen height temporal vertical high-frequency component (VT signal). For example, the vertical high frequency component of the wide video signal is detected based on the vertical reinforcement signal (VH, VT signal). The vertical reinforcement signal detection circuit 23 outputs the detection result to the mode determination circuit 24 as a vertical high frequency signal.
It is obvious that the horizontal high frequency component and the vertical high frequency component of the input video signal may be detected without using the horizontal and vertical reinforcement signals.

The mode determination circuit 24 compares the horizontal high frequency signal and the vertical high frequency signal for one screen and creates a mode signal indicating a plurality of modes based on the comparison result. Each mode is
It defines the horizontal and vertical compression rates for the input wide video signal. The mode signal from the mode determination circuit 24 is given to the coefficient circuits 28 and 29, the memory control circuit 30 and the format creation circuit 31.

On the other hand, the input video signal input to the input terminal 21 is also given to the adaptive horizontal LPF (low pass filter) 25. The filter characteristics of the adaptive horizontal LPF 25 are determined by the coefficient circuit 28. The coefficient circuit 28 changes the coefficient on the basis of the mode signal, and the adaptive horizontal LPF 25
The filter characteristics of are changed. The adaptive horizontal LPF 25 limits the horizontal band of the input wide video signal in order to prevent aliasing distortion.
Output to 26.

Adaptive Vertical LPF (Low Pass Filter) 26
The filter characteristics are determined by the coefficient circuit 29. The coefficient circuit 29 changes the coefficient based on the mode signal to change the filter characteristic of the adaptive vertical LPF 26. The adaptive vertical LPF 26 limits the vertical band of the input wide video signal and outputs it to the frame memory 27 in order to prevent aliasing distortion.

In the frame memory 27, writing and reading are controlled by the memory control circuit 30, and the wide video signal from the adaptive vertical LPF 26 with limited horizontal and vertical bands is compressed and stored, and the data array is changed. And outputs it to the format creation circuit 31. The memory control circuit 30 generates write and read addresses of the frame memory 27 based on the mode signal. For example, the memory control circuit 30 performs writing while thinning out the wide video signal from the adaptive vertical LPF 26 in the horizontal direction when the mode signal specifies a mode for compressing only in the horizontal direction. Further, for example, the memory control circuit 30 performs writing while thinning out the wide video signal in the vertical direction when a mode for compressing only in the vertical direction is designated by the mode signal. The memory control circuit 30 reads the written image data while thinning out in the horizontal and vertical directions in an array according to the recording format, and outputs it to the format creating circuit 31.

The format creating circuit 31 converts the format of the image data and the mode signal from the frame memory 27 in accordance with the recording format to convert the consumer digital VT.
It is designed to output to R32. Consumer digital V
TR32 has, for example, the same configuration as that shown in FIG. 6, and is adapted to perform high-efficiency coding of an input digital video signal and record it on a magnetic recording medium (not shown).

Next, the operation of the embodiment thus constructed will be described.

The wide video signal from the input terminal 21 is applied to the horizontal reinforcement signal detection circuit 22 and the vertical reinforcement signal detection circuit 23. The horizontal reinforcement signal detection circuit 22 detects a horizontal high frequency component by the horizontal reinforcement signal, and determines the horizontal high frequency signal as a mode determination circuit.
Output to 24. Further, the vertical reinforcement signal detection circuit 23 detects a vertical high frequency component based on the vertical reinforcement signal and outputs the vertical high frequency signal to the mode determination circuit 24. The mode determination circuit 24 is
The mode to be set is determined by the horizontal and vertical high frequency signals and output as a mode signal. On the other hand, the input video signal is band-limited horizontally and vertically by the adaptive horizontal LPF 25 and the adaptive vertical LPF 26, and then applied to the frame memory 27.

Now, for example, it is assumed that the horizontal high-frequency signal indicates that the horizontal high-frequency component is sufficiently included, and the vertical high-frequency signal indicates that the vertical high-frequency component is not included. . In this case, the mode determination circuit 24
The mode signal specifies the mode for performing the compression shown in FIG. 1 (b1), for example. In this case, the coefficient circuits 28 and 29
By setting the characteristics of the adaptive horizontal LPF 25 and the adaptive vertical LPF 26, the band is sufficiently limited only in the vertical direction.

The memory control circuit 30 is a frame memory.
By controlling the writing of 27, the wide video signal from the adaptive vertical LPF 26 is thinned out in the vertical direction to make 480 scanning lines 3
Writing to the frame memory 27 is performed while compressing to 60 lines. Further, the memory control circuit 30 controls the reading of the frame memory 27 so that the data array shown in FIG. 1 (c1) is obtained, that is, the format is 720 pixels × 480 lines, in DCT block units. Read out.
As a result, the image data from the frame memory 27 can be processed as if it were a video signal having an aspect ratio of 4: 3.

The format creating circuit 31 format-converts the image data from the frame memory 27 and the mode signal according to the recording format. Consumer digital V
The TR 32 records the output of the format forming circuit 31 on a recording medium (not shown) after high efficiency coding. The consumer digital VTR 32 is a DCT based on the frame memory 27.
Information about the movement of blocks is recorded in, for example, the subcode area.

Further, for example, when it is shown by the horizontal high frequency signal and the vertical high frequency signal that only the vertical high frequency component is sufficiently included, the mode determination circuit 24 is
A mode signal for performing compression shown in (b4) is output. In this way, the mode determination circuit 24 determines the mode according to the horizontal and vertical high frequency components of the input wide video signal. As a result, the wide video signal is compressed to a recordable band while suppressing deterioration to the minimum. In this way, recording with little deterioration is performed by the consumer digital VTR 32.

On the other hand, at the time of reproduction, after decoding the reproduction signal, the data is rearranged based on the information stored in the subcode area. This makes it possible to obtain compressed data during recording. Further, horizontal and vertical compression ratios are obtained from the reproduced mode signal, and interpolation is performed, for example, to obtain the original wide video signal of 960 pixels × 480 lines.

As described above, in this embodiment, the wide video signal can be recorded in the consumer digital VTR while suppressing the deterioration of the image quality to the minimum.

FIG. 3 is a block diagram showing another embodiment of the present invention. In FIG. 3, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

The input video signal input to the input terminal 21 is
For example, it is a signal before decoding of the received second generation EDTV signal. That is, the input video signal has an aspect ratio of 1
Although it is 6: 9, the resolution is 720 horizontal pixels x 360 vertical pixels.
A line, which includes horizontal and vertical reinforcement signals.

A horizontal reinforcement signal and a vertical reinforcement signal are given to the mode determination circuit 41 from a decoder (not shown). The mode determination circuit 41 detects a horizontal high frequency component and a vertical high frequency component of the input video signal based on the horizontal reinforcement signal and the vertical reinforcement signal,
The mode is decided based on the detection result. The mode signal from the mode determination circuit 41 is the coefficient circuit 44,
45 and the memory control circuit 30. The coefficient circuits 44 and 45 are adapted to set a predetermined coefficient based on the mode signal.

The input video signal from the input terminal 21 is an adder circuit.
Give to 42. The adder circuit 42 multiplies the horizontal reinforcement signal by the coefficient from the coefficient circuit 44 and adds it to the main picture portion of the input video signal. The output of the adder circuit 42 is given to the adder circuit 43. The adder circuit 43 multiplies the vertical reinforcement signal by the coefficient from the coefficient circuit 45, adds the result to the main picture section, and outputs the result to the frame memory 27. As a result, the horizontal and vertical resolutions are stored in the frame memory 27 by the coefficient circuits 44,
An improved wide video signal is input based on the coefficient from 45. That is, the horizontal resolution of the video signal input to the frame memory 27 is 720 to 960 pixels,
The vertical resolution is 360 to 480 lines.

The memory control circuit 30 controls the reading of the frame memory 27 and changes the arrangement, for example, in DCT block units so as to convert the video data written in the frame memory 27 into the format of the recording system. As a result, for example, the image data shown in FIGS. 1C1 to 1C4 is supplied to the format creation circuit 31.

In the embodiment thus constructed,
The mode determination circuit 41 outputs a mode signal according to the horizontal and vertical high frequency components of the input video signal. Now, for example, it is assumed that the vertical high frequency component is not included and only the horizontal high frequency component is included. In this case, the mode determination circuit 41 outputs a mode signal for setting the resolution of the input video signal to that shown in FIG. 1 (b1), for example. Coefficient circuit 44 produces a coefficient of 1 and coefficient circuit 45 produces a coefficient of 0.

The main image portion signal from the input terminal 21 is added by the adder circuit.
At 42, the horizontal reinforcement signal is added. As a result, the horizontal resolution of the main image portion signal is improved to the maximum of 960 pixels. Since the coefficient of the coefficient circuit 45 is 0 in the adder circuit 43,
Do not add the vertical reinforcement signal to the main picture signal. This allows
The video signal shown in FIG. 1B1 is obtained from the adder circuit 43.

This video signal is written in the frame memory 27 by the memory control circuit 30. The memory control circuit 30 controls the reading from the frame memory 27 based on the mode signal, and outputs the image data in the data array shown in FIG. 1 (c1). Other functions are similar to those of the embodiment shown in FIG.

It is obvious that the same effects as those of the embodiment of FIG. 2 can be obtained in this embodiment as well. Further, in the present embodiment, the horizontal and vertical reinforcement signals are obtained from the decoding circuit of the second generation EDTV signal (not shown), which is advantageous in that the circuit configuration is simple.

[0069]

As described above, according to the present invention, it is possible to suppress the deterioration of the image quality of the reproduced image by changing the recording screen size according to the resolution of the wide image.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a wide aspect video signal recording method according to the present invention.

FIG. 2 is a block diagram showing an embodiment of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 3 is a block diagram showing another embodiment according to the present invention.

FIG. 4 is an explanatory diagram for explaining a recorded image when a wide video signal is recorded on a consumer VTR.

FIG. 5 is an explanatory diagram for explaining a recorded image in a conventional example.

FIG. 6 is a block diagram showing a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

22 ... Horizontal reinforcement signal detection circuit, 23 ... Vertical reinforcement signal detection circuit, 24 ... Mode determination circuit, 27 ... Frame memory, 28, 29
… Coefficient circuit, 30… Memory control circuit, 31… Format creation circuit, 32… Consumer VTR

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G11B 20/12 103 9295-5D H04N 9/80

Claims (10)

[Claims] 1. A procedure for inputting an input video signal of a band wider than a band recordable by a recording system and detecting a horizontal high frequency component and a vertical high frequency component of the input video signal, and the horizontal high frequency component and the vertical high frequency component. A compression procedure for compressing the horizontal band and the vertical band of the input video signal at a horizontal compression rate and a vertical compression rate based on the detection result of the high frequency component to change them into a band recordable by the recording system, and a compressed image A wide aspect video signal recording method, which comprises a step of recording a signal after converting the format of the signal corresponding to the recording format of the recording system. 2. A procedure for detecting the horizontal high frequency component and the vertical high frequency component from an input video signal in which the horizontal high frequency component and the vertical high frequency component are multiplexed, and detecting the horizontal high frequency component and the vertical high frequency component. A reinforcing procedure for expanding the horizontal and vertical bands of the input video signal with the horizontal and vertical reinforcement ratios based on the results to expand the input video signal to a recordable band in the recording system, and the reinforced video signal. A wide aspect video signal recording method, comprising the step of recording after format conversion corresponding to the recording format of the recording system. 3. A magnetic recording / reproducing means for magnetically recording an input signal on a predetermined magnetic recording medium, a horizontal high frequency component detecting means for detecting a horizontal high frequency component when a wide aspect video signal is input, and the wide aspect ratio. A vertical high frequency component detecting means for detecting a vertical high frequency component to which a video signal is inputted, a mode determining means for setting a mode based on the detection result of the horizontal and vertical high frequency component detecting means, and a mode determining means set by this mode determining means. Compressing means for compressing the wide aspect video signal at a compression rate of horizontal and vertical bands according to the mode and changing it to a recordable band in the magnetic recording / reproducing means, and the output of the compressing means corresponds to a predetermined recording format. And a format conversion unit for converting the format and giving the converted format to the magnetic recording and reproducing unit. . 4. The wide aspect video signal includes a second video signal.
The signal of the generation EDTV system, wherein the horizontal and vertical high frequency component detection means uses the horizontal reinforcement signal and the vertical reinforcement signal multiplexed with the signal of the second generation EDTV system to generate the horizontal high frequency component of the wide aspect video signal. 5. The magnetic recording / reproducing apparatus according to claim 3, wherein the vertical high frequency component is detected. 5. The magnetic recording / reproducing apparatus according to claim 3, wherein the compression unit thins out horizontal pixels and vertical lines of the wide aspect video signal to perform compression. 6. The magnetic recording / reproducing according to claim 3, further comprising a two-dimensional low-pass filter means for band-limiting the wide aspect video signal at a cutoff frequency according to the mode and giving it to the compression means. apparatus. 7. The magnetic recording / reproducing apparatus according to claim 3, wherein the format converting means gives the information about the mode to the magnetic recording / reproducing means together with the output of the compressing means for recording. 8. The magnetic recording / reproducing apparatus according to claim 7, wherein the magnetic recording / reproducing means records information on the mode in a subcode portion. 9. A magnetic recording / reproducing means for magnetically recording an input signal on a predetermined magnetic recording medium, and a wide aspect video signal in which a horizontal high frequency component and a vertical high frequency component are multiplexed and the horizontal high frequency component is inputted. A horizontal high-frequency component detecting means for detecting the vertical high-frequency component detecting means for detecting the vertical high-frequency component to which the wide aspect video signal is input, and a mode based on the detection results of the horizontal and vertical high-frequency component detecting means And a reinforcing means for reinforcing the wide aspect video signal with a reinforcement rate of horizontal and vertical bands according to the mode set by the mode determining means to change it to a recording band of the magnetic recording / reproducing means. Format conversion means for converting the output of the reinforcing means into a format corresponding to a predetermined recording format and giving the format to the magnetic recording / reproducing means. Magnetic recording and reproducing apparatus characterized by the. 10. The wide aspect video signal is a signal of the second generation EDTV system, and the reinforcing means inputs the horizontal reinforcement signal and the vertical reinforcement signal multiplexed with the signal of the second generation EDTV system. The magnetic recording / reproducing apparatus according to claim 9, wherein the horizontal and vertical bands are reinforced by adding to the signal.