JPH0955913A - Recording device and recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To preserve all the viewing angles of still pictures even when the input still pictures different in the number of scanning lines are recorded in accordance with a VGA standard by multiplying the number of pixels in the auxiliary scanning direction of an input still picture signal by K-times so as to record them with a linear insertion/interpolation processing. SOLUTION: In a scanning line conversion circuit 4, a recording operation part executes the linear insertion/interpolation processing. Thus, the number of the pixels in the auxiliary scanning direction after an operation becomes K-times as much as the original number of the pixels. The value of K can easily be changed when the value of interior division point information is suitably selected. In the still picture of a PAL system having a larger number of the scanning lines, for example, the value of interior division point information by which the value of K becomes smaller than '1' may be selected. At the time of recording, the recording operation part executes the linear insertion/ interpolation operation by using field data ODD and EVE, which are read out of field memories 8A and 8B, and an operated result is supplied to a recording and reproducing part 6 through a buffer memory 5.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. TECHNICAL FIELD OF THE INVENTION Conventional Technology Problems to be Solved by the Invention Means for Solving the Problems Embodiments of the Invention (FIGS. 1 to 4)

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording device and a recording / reproducing device, and a still image of a different signal system such as an NTSC system or a PAL system is displayed on a VGA (Video Graphic).
Array) It is suitable for application when recording and reproducing on a predetermined recording medium as recording data of the same format according to the Array standard.

[0003]

2. Description of the Related Art Conventionally, there is one in which a still image is recorded on a recording medium by a recording format according to the VGA standard (that is, 480 × 640 pixels are arranged in the vertical and horizontal directions, and each pixel is arranged in a square lattice pattern). . If still image data according to the VGA standard is recorded in this way, the data can have versatility when image processing is performed by a computer, and image processing such as image rotation can be easily performed. It can be carried out.

[0004]

By the way, when a still image of the NTSC system or the PAL system is recorded according to the VGA standard, the number of scanning lines of the video signals is different, so that the still image of the NTSC system is obtained. In the case of the PAL system, about 20% of the data in the vertical direction (sub-scanning direction) is lost. This is because the number of scanning lines in the PAL system is as large as 575, and if the number of pixels in the sub-scanning direction of the VGA standard is 480, the number of pixels in the sub-scanning direction will not fit within the standard. As a result,
When a PAL system still image is recorded according to the VGA standard and is reproduced and displayed, there is a problem that a black frame appears at the vertical edge.

In other words, creating recording data in conformity with the VGA standard means, in other words, converting the input image so that the pixel aspect ratio is 1: 1 and the image aspect ratio is 3: 4. Depending on the number of scanning lines of the original still image signal, if the angle of view is set to satisfy this aspect ratio, a part of the image in the sub scanning direction is lost.

The present invention has been made in consideration of the above points, and even when input still images having different scanning lines are recorded in accordance with the VGA standard, the recording can be performed by saving all the angle of view of these still images. An object of the present invention is to propose an apparatus and a recording / reproducing apparatus capable of performing a format conversion of a still image with a certain number of scanning lines into a still image with a different number of scanning lines in a state where all the angles of view are preserved.

[0007]

In order to solve such a problem, in the present invention, the number of pixels of the input still image signal in the sub-scanning direction is multiplied by K and recorded by the linear interpolation processing.

As a result, the number of pixels in the sub-scanning direction is arbitrarily set by the value of K, and the pixel aspect ratio is set to 1: 1 according to the VGA standard as in the case of a PAL system still image signal, and If the image aspect ratio is set to 3: 4 and the value of K is set to a predetermined value smaller than "1",
It is possible to obtain print data in which loss of an image in the sub-scanning line direction is avoided.

Further, according to the present invention, the number of pixels of the input still image signal in the sub-scanning direction is multiplied by K by the linear interpolation processing so that the respective pixels are arranged in a square lattice and a predetermined image aspect ratio is obtained. The recording data is formed and recorded, and the number of pixels in the sub-scanning direction of the reproduction data reproduced from the recording medium is multiplied by L by the linear interpolation processing and output.

As a result, still image signals having different scanning line numbers are recorded in the same format in the state where the whole angle of view is preserved, and at the time of reproduction, the recorded data of the same format is scanned in a desired state in the state where the whole angle of view is preserved. It is a still image with the number of lines.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a recording / reproducing apparatus as a whole, which is adapted to convert an input still image signal S1 into recording data in accordance with the VGA standard and record it. The recording / reproducing apparatus 1 supplies the input still image signal S1 to the analog digital conversion (A / D conversion) circuit 2 via the input terminal IN. The A / D conversion circuit 2 obtains still image data S2 by sampling the input still image signal S1 at a predetermined sampling frequency.

Here, the sampling frequency of the A / D conversion circuit 2 is selected to be the same frequency even when the signal format of the input still image signal S1 is different. Still image data S2
Is applied to the terminal a of the switch 3. The switch 3 is configured such that the terminal a is selected at the time of recording and the terminal b is selected at the time of reproduction by a system controller (not shown).

The still image data S2 is subjected to scanning line conversion by the scanning line conversion circuit 4, and then recorded on a recording medium such as a magneto-optical disk by the recording / reproducing section 6 via the buffer memory 5. Here, the scanning line conversion circuit 4 performs the scanning line conversion process by which the number of pixels in the sub-scanning direction of the input still image signal S1 is multiplied by K (that is, the number of scanning lines is multiplied by K) by the linear interpolation processing. .

The scanning line conversion circuit 4 selectively supplies the still image data S2 to the first and second field memories 8A and 8B via the switch 7. That is, when the incoming still image data S2 is an odd field data, the switch 7 selects the terminal a and stores it in the first field memory 8A, and the incoming still image data S2 is an even field data. Terminal b
Is selected and stored in the first field memory 8B. Therefore, one frame of still image is stored in the first and second field memories 8A and 8B.

Here, the first and second field memories 8 are
The writing of data to A and 8B is controlled by the memory controller 9. That is, the memory controller 9
Sends to the switch 7 a switching control signal S4 for switching the terminals of the switch 7 at the field break position based on the sync signal S3 obtained by the sync separation circuit 10 for separating the sync signal from the input still image signal S1. At the same time, the field memory 8A
A write control signal S5 for switching the write operation of 8B is sent to the field memories 8A and 8B. As a result, when the odd field of the still image signal S1 is input, the terminal a of the switch 7 is selected and the first field memory 8A is in the writing state, and when the even field is input, the terminal b of the switch 7 is selected. Is selected and the second field memory 8b is set to the write state.

When one frame of still image data S2 is stored in the first and second field memories 8A and 8B, the first and second field memories 8A are read based on the read control signal S6 from the memory controller. And 8B
The data is read out in the order of the scanning lines at substantially the same time.

The odd field data ODD read from the first field memory 8A is multiplied by the multiplication circuit 11
B and 11D and even field data EVE read from the second field memory 8B.
Are supplied to the multiplication circuits 11A and 11C. Here, the respective multiplication circuits 11A to 11D are supplied with corresponding multiplication coefficients from the conversion coefficient generation circuit 12. The conversion coefficient generation circuit 12 calculates the multiplication coefficient based on the timing signal S7 from the memory controller 9 in each of the multiplication circuits 11A to 11A.
The data is output so as to be synchronized with the timing when the read data is supplied to 11D.

Here, the multiplication circuits 11A and 11B and the addition circuit 13A constitute the reproduction operation unit 14, and the multiplication circuits 11C and 11D and the addition circuit 13B are included in the recording operation unit 1.
Make up 5. Field memory 8A, 8 during recording
The field data ODD and EVE read from B are used to perform a linear interpolation operation by the recording operation unit 15, and the operation result is supplied to the recording / reproducing unit 6 via the buffer memory 5. At this time, the multiplication circuit 11C is supplied with “1-G ₁ ” as a multiplication coefficient, and the multiplication circuit 11D is supplied with “G ₁ ” as a multiplication coefficient from the conversion coefficient generation circuit 12, and each multiplication result is supplied to the addition circuit 13B. Are added. In this way, the recording calculation unit 15 performs the linear interpolation calculation using the multiplication coefficient G ₁ as the interior division point information, and converts it into the number of scanning lines according to the interior division point information “G ₁ ”.

In practice, in the recording operation section 15, the pixel data read from the field memories 8A and 8B, which are adjacent to each other in the sub-scanning direction when viewed on one screen, and the internal division point from the conversion coefficient generating circuit 12. The pixel of interest between the original scanning lines is generated by linear interpolation by the sum of products operation using the information G ₁ . That is, when the pixel value of the odd field is P1 and the pixel value of the even field adjacent thereto is P2, the recording arithmetic unit 15 determines the pixel value X of the target pixel by using the internal division point information G ₁ and formula

[Equation 1] To ask. As a result, as shown in FIG. 2, it is possible to effectively reduce the number of pixels (scanning lines) in the sub-scanning direction of the entire still image data according to the value of the internally dividing point information G ₁ . The value of the internally dividing point information G ₁ is, for example, as shown in FIG.
It is selected as shown in. That is, `` 1.
The number of scanning lines becomes 5/6 times the original number of scanning lines by selecting the internal division point information K ₁ such that the patterns of "0", "0.2", "0.6", and "0.2" are sequentially repeated. Such conversion processing is realized.

As a result, from the input still image signals S1 having different numbers of scanning lines, the VGA-standard recording data S8 in which the entire angle of view is stored without thinning out the scanning lines at the upper and / or lower end portions of those images is obtained. Can be formed. As described above, in the scanning line conversion circuit 4, the number of pixels in the sub-scanning direction after calculation is K times the original number of pixels by performing the linear interpolation processing by the recording calculation unit 15. Has been done. The value of "K" can be easily changed by appropriately selecting the value of the internally dividing point information G ₁ . For example P
If there are many scanning lines, such as the AL system still image,
Internal division point information G such that the value of "K" is smaller than "1"
Select a value of ₁ .

In the case of the embodiment, the recording / reproducing unit 6 is a magneto-optical recording / reproducing apparatus which records the recording data on the magneto-optical disk by the magnetic field modulation head and reproduces the recording data by the optical head. The reproduction data S9 reproduced by the recording / reproducing unit 6 is supplied to the scanning line conversion circuit 4 via the buffer memory 16 and the switch 3. The scanning line conversion circuit 4 temporarily stores the odd field of the reproduced data S9 in the first field memory 8A and the even field of the reproduced data S9 in the second field memory 8B, and stores a reproduced still image for one frame, as in the recording. At that time, the data is read from the first and second field memories 8A and 8B at the same time.

During this reproduction, the field memory 8A,
Field data ODD and EVE read from 8B
On the other hand, the reproducing arithmetic unit 14 performs scanning line conversion calculation for increasing the number of scanning lines L times, and the reproduced still image data S10 obtained by the calculation result is converted to digital analog (D / A).
It is sent to, for example, a television monitor via the (conversion) circuit 17 and the output terminal OUT. At this time, the multiplication circuit 11A
1-G ₂ as a multiplication coefficient, and G ₂ as a multiplication coefficient are supplied to the multiplication circuit 11B from the conversion coefficient generation circuit 12, and the respective multiplication results are added in the addition circuit 13A. In this way, the reproducing operation unit 14 performs the linear interpolation operation using the multiplication coefficient G ₂ as the interior division point information, and the number of scanning lines is multiplied by L according to the interior division point information “G ₂ ”.

That is, the reproducing arithmetic unit 14 uses the pixel data adjacent to each other in the sub-scanning direction and the internal division point information G ₂ when viewed on one screen, as in the recording arithmetic unit 15 described above. By performing the sum of products operation, the pixel of interest is generated by linear interpolation. As a result, the reproduction calculation unit 14 obtains the reproduction still image data S10 in which the number of scanning lines is converted to L times while keeping the entire angle of view.

In the above configuration, the recording / reproducing apparatus 1 has N
The case where the TSC or PAL still image signal S1 is input will be described. The recording / reproducing apparatus 1 is NTSC
When the still image signal S1 of the method is input, the still image signal S1 has a pixel aspect ratio of 1: 1 and 640 ×
In order to make the format according to the VGA standard consisting of 480 pixels, first, the sampling frequency f of the A / D conversion circuit 2 is set.
_The still image signal S1 is sampled by setting _P to 12.292875 [MHz].

As a result, still image data S2 having a pixel aspect ratio of 1: 1 and 646 × 485 pixels is obtained. Since the still image data S2 substantially satisfies the VGA standard, the recording / reproducing apparatus 1 uses the still image data S2.
2 is recorded as it is, reproduced as it is, and sent to an external display device. That is, the recording arithmetic unit 1
The value of the internal division point information G ₁ used in 5 is set to “1”, and the value of the internal division point information G ₂ used in the reproducing operation unit 14 is set to “1”. As a result, reproduced still image data S10 consisting of 646 × 485 pixels is obtained, and when this is displayed on the television screen, as shown in FIG.
It is possible to obtain a display image in which the angle of view of [%] is saved.

On the other hand, when the PAL system still image signal S1 is input to the recording / reproducing apparatus 1, first, the A / D conversion circuit 2 samples at the same sampling frequency f _P as in the NTSC system. Generally, when recording data according to the VGA standard is to be generated from a PAL still image signal, the sampling frequency f _P ′ is 14.743590.
It is necessary to sample as [MHz].

This sampling frequency f _P ′ is NTSC
It is 1.199 (6/5 times) the sampling frequency f _P at that time. That is, as in this embodiment, the input still image signal S1 of the PAL system with the same sampling frequency f _P as that of NTSC is used.
When sampling is performed, the number of pixels equivalent to that of NTSC can be obtained without changing the image aspect ratio by increasing the number of scanning lines by 5/6.

Therefore, when the PAL type input signal image signal S1 is input, the recording / reproducing apparatus 1 causes the A / D conversion circuit 2 to have the same sampling frequency f as that of NTSC.
Sampling is performed at _P , and scanning line conversion processing is performed in the scanning line conversion circuit 4 so that the number of scanning lines is multiplied by 5/6. In practice, this processing is performed by the multiplication circuit 11C of the recording arithmetic unit 15,
This is realized by selecting the value of the internally dividing point information G ₁ given to 11D as shown in FIG.

As a result, the scan line conversion circuit 4 outputs 639 × 4.
Data of 79 (≒ 575 × 5/6) pixels were obtained, and when compared with the VGA standard, one pixel was deleted for both vertical and horizontal, which is approximately V
It meets the GA standard. Thus, the VGA standard recording data S8 in which all the angle of view is stored can be obtained from the PAL system input image signal S1.

At the time of reproducing the recorded PAL signal, the reproducing arithmetic circuit 14 performs linear interpolation processing for increasing the number of scanning lines by 6/5, and the number of scanning lines is returned to the original state. As a result, reproduced still image data S10 consisting of 639 × 479 pixels is obtained. When this is displayed on the television screen, almost the entire image is displayed as shown in FIG. 4B (0.2 [%] overscan). It is possible to obtain a display image in which the corners are saved.

Also, P recorded and converted to the VGA standard
When the AL system still image data is reproduced, if the value of the internal division point information G ₂ used in the reproducing arithmetic circuit 14 is selected as “1”, it can be output as the NTSC system still image data S10.

As described above, in the recording / reproducing apparatus 1, at the time of recording, the input still images S having different signal formats (number of scanning lines) are recorded.
The same recording format (V
If the internal division point information G ₂ of the reproducing operation unit 14 is appropriately selected at the time of reproduction, it can be recorded by, for example, NTS.
It is also possible to easily convert an image in the C format into an image in the PAL format or an image in the PAL format into an image in the NTSC format.

According to the above configuration, the input still image signal S
According to the VGA standard, the value of the internally dividing point information G ₁ is appropriately selected according to the signal format (the number of scanning lines) of ₁ and linear interpolation processing is performed to increase the number of pixels in the sub-scanning direction by K times. Since the recording data is formed, the input still image signal S
Regardless of the number of scanning lines of 1, it is possible to obtain the VGA standard recording data S8 in which the entire angle of view is stored.

When the recording data recorded by performing the above linear interpolation processing is reproduced, the number of pixels in the sub-scanning direction is set to L.
By performing the double linear interpolation processing, it is possible to obtain reproduced still images in various signal formats (number of scanning lines) from reproduced data according to the VGA standard. As a result, for example, from a PAL image to an NTSC image or an NTSC image
It becomes possible to perform conversion from an image to a PAL image in a state in which all angles of view are saved.

The sampling frequency f _{P in the} main scanning direction
By changing the number of pixels in the sub-scanning direction without changing the recording data of the same format, the recording data of the same format can be obtained from still images with different scanning line numbers with a relatively simple structure. Can be formed.

In the above embodiment, the present invention is
The case where the recording data is recorded on the magneto-optical disk by the magnetic field modulation head and the recording data is reproduced by the optical head has been described, but the present invention is not limited to this. A magnetic disk recording / reproducing apparatus for recording and reproducing record data on a disk by a magnetic head, a recording apparatus for creating a photo CD, a reproducing apparatus for reproducing record data from the photo CD, and the like.
It can be applied to various recording devices and recording / reproducing devices.

[0038]

As described above, according to the present invention, an input still image signal is input to a recording device in which each pixel is arranged in a square lattice and is converted into recording data having a predetermined image aspect ratio and then recorded. Since the number of pixels of the still image signal in the sub-scanning direction is multiplied by K by the linear interpolation processing and then recorded on a predetermined recording medium, still images with different scanning line numbers comply with the VGA standard. Even when recording is performed, it is possible to realize a recording device that can obtain recording data in which all the angles of view of these still images are stored.

Further, according to the present invention, as described above, the VG
Since the number of pixels in the sub-scanning direction of the still image recorded according to the A standard is multiplied by L by the linear interpolation processing and reproduced and output, all the still images recorded according to the VGA standard are output. Reproduced still images with different numbers of scanning lines can be obtained with the angle of view preserved. Thus, it is possible to realize a recording / reproducing apparatus capable of performing a format conversion of a still image having a certain number of scanning lines into a still image having a different number of scanning lines in a state in which the entire angle of view is preserved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic diagram for explaining a scan line conversion process by a scan conversion circuit.

FIG. 3 is a schematic diagram showing a numerical example of internal division point information G ₁ when converting the number of scanning lines in the PAL system into the number of scanning lines according to the VGA standard.

FIG. 4 is a schematic diagram showing a display state of a reproduced still image recorded / reproduced by the recording / reproducing apparatus according to the embodiment.

[Explanation of symbols]

1 ... Recording / reproducing device, 2 ... Analog digital conversion circuit, 4 ... Scan line conversion circuit, 8A, 8B ... Field memory, 14 ... Reproduction arithmetic unit, 15 ... Recording arithmetic unit, S1 ... Input still image signal, S2 ... Still image data, S3 ... Sync signal, S8 ... Record data, S9 ...
Reproduction data, S10 ... Reproduction still image data, G ₁ , G
₂ …… Internal division point information.

Claims (9)

[Claims] 1. A recording apparatus for converting an input still image signal into recording data in which each pixel is arranged in a square lattice and having a predetermined image aspect ratio and recording the same, wherein pixels in the sub-scanning direction of the input still image signal. A recording apparatus, wherein the number is multiplied by K by linear interpolation processing and then recorded on a predetermined recording medium. 2. Sampling means for forming still image data by sampling the input still image signal at a predetermined sampling frequency, and first and second storing the odd field data and the even field data of the still image data, respectively. Field interpolation memory and the odd field pixel data and even field pixel data that are adjacent to each other in the sub-scanning direction of the still image data stored in the first and second field memories. Thus, the calculating means for converting the still image data into recording data in which the number of pixels in the sub-scanning direction is K times as large as the still image data, and the recording data obtained by the calculating means is recorded on a recording medium. The recording apparatus according to claim 1, further comprising a recording unit that records. 3. The value of K is selected so that it is proportional to the sampling frequency of the sampling means and the pixel aspect ratio of the recording data obtained by the computing means is 1: 1. The recording device according to claim 2. 4. The sampling frequency of the sampling means is 12.29875 [MHz], and the value of K is almost "1" when the input still image signal is an NTSC system signal.
The recording apparatus according to claim 2, wherein the PAL system signal is set to approximately "5/6". 5. A recording / reproducing apparatus which converts an input still image signal into recording data in which each pixel is arranged in a square lattice and has a predetermined image aspect ratio and records the same, and reproduces the recording data. By multiplying the number of pixels of the still image signal in the sub-scanning direction by K by the linear interpolation processing, the pixels are arranged in a square lattice and the above-mentioned recording data having a predetermined image aspect ratio is formed and recorded. At the same time, the recording / reproducing apparatus is characterized in that the number of pixels of the reproduction data reproduced from the recording medium in the sub-scanning direction is multiplied by L by the linear interpolation processing and is output. 6. Sampling means for forming still image data by sampling the input still image signal at a predetermined sampling frequency, and first and second storing the odd field data and the even field data of the still image data, respectively. Field interpolation memory and the odd field pixel data and even field pixel data that are adjacent to each other in the sub-scanning direction of the still image data stored in the first and second field memories and perform linear interpolation calculation. The first arithmetic means for converting the still image data into recording data in which the number of pixels in the sub-scanning direction is K times that of the still image data, and the recording data obtained by the first arithmetic means. Recording means for recording the data on a recording medium, and recording data recorded by the recording means. Data from the recording medium, and linear interpolation using the odd field pixel data and the even field pixel data which are adjacent to each other in the sub-scanning direction of the reproduction data stored in the first and second field memories. A second arithmetic means for converting the reproduction data into reproduction still image data in which the number of pixels in the sub-scanning direction is L times as large as that of the reproduction data by performing interpolation calculation. Item 5. The recording / reproducing apparatus according to item 5. 7. The recording / reproducing apparatus according to claim 6, wherein the value of L is selected to be 1 / K. 8. The value of K is selected so that it is proportional to the sampling frequency of the sampling means and the pixel aspect ratio of the recording data obtained by the first computing means is 1: 1. 7. The method according to claim 6, wherein
The recording / reproducing device according to. 9. The sampling frequency of the sampling means is 12.29875 [MHz], and the value of K is substantially "1" when the input still image signal is an NTSC system signal.
7. The recording / reproducing apparatus according to claim 6, wherein in the case of a PAL system signal, the value is approximately "5/6".