JP2007036388A - Reproducing unit and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reproducing unit and a reproducing method enabling a special reproduction of HD and SD images by simple processing. <P>SOLUTION: A reproducer 104 selects image data for normal reproduction that are recorded on a magnetic tape 103 and allow a video signal to be coded, and data for special reproduction generated by using the image data for normal reproduction partially for reproduction. A data processor 106 for special reproduction converts the data for special reproduction reproduced by the reproducer 104 to a first image signal (SD video signal), where the number of pixels per screen is more than that of the data for special reproduction. A video signal processor 108 converts the first image signal to a second one (HD video signal), where the number of pixels per screen is more than that of the first image signal. A D/A 110 converts the first image signal to an analog signal for output. A D/A 111 converts the second image signal to an analog signal for output. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reproducing apparatus and a reproducing method suitable for reproducing video data recorded on a magnetic tape or the like.

  In a recording / playback device that encodes video data using the Moving Picture Expert Group (MPEG) method and records it on a magnetic tape, the main image data and special playback (fast forward playback, rewind playback, etc.) data are in separate areas. Is recorded. For example, as in the magnetic tape recording apparatus described in Patent Document 1, the code amount is fixed by extracting the DC component from the DCT coefficient in the DCT block of the I picture in the encoded main image. Special playback data can be obtained. When reproducing such special reproduction data, generally, the special reproduction image is converted again into an MPEG stream and decoded to obtain a reproduction image.

  In addition, at present, in a recording / reproducing apparatus capable of outputting HD (High Definition) video, not only HD video signal output means but also SD in consideration of connection to a television monitor capable of displaying only SD (Standard Definition). In many cases, video output means is provided. For this reason, SD video is reproduced even when a magnetic tape on which HD video is recorded is reproduced. This is the same not only during normal reproduction but also during special reproduction.

JP 2001-298706 A

  However, when simultaneously playing back HD video and SD video during special playback, the following processing is required in the conventional apparatus. In other words, it is necessary to convert the special playback image into an MPEG stream and then downconvert the special playback image obtained by decoding the MPEG stream to generate a special playback video with a resolution different from that of the main image. It is. Such processing is complicated both in terms of hardware and software.

  An object of the present invention is to provide a playback apparatus and a playback method capable of special playback of HD video and SD video with simple processing.

  As a result of intensive studies to solve the above problems, the present inventor has come up with various aspects of the invention described below.

  A playback apparatus according to the present invention includes: normal playback image data encoded from a video signal recorded on a recording medium; and special playback data generated using a part of the normal playback image data. Reproduction means for selecting and reproducing, and first conversion for converting the special reproduction data reproduced by the reproduction means into a first image signal having a larger number of pixels per screen than the special reproduction data Means, a second conversion means for converting the first image signal into a second image signal having a larger number of pixels per screen than the first image signal, and outputting the first image signal. And a second output means for outputting the second image signal.

  The reproduction method according to the present invention comprises: normal reproduction image data encoded from a video signal recorded on a recording medium; and special reproduction data generated using a part of the normal reproduction image data. A reproduction step for selecting and reproducing, and a first conversion step for converting the special reproduction data reproduced in the reproduction step into a first image signal having a larger number of pixels per screen than the special reproduction data. A second conversion step of converting the first image signal into a second image signal having more pixels per screen than the first image signal, the first image signal, and the first image signal And an output step for outputting two image signals.

  The program according to the present invention selects normal reproduction image data encoded on a video signal recorded on a recording medium and special reproduction data generated using a part of the normal reproduction image data. A program for causing a computer to execute control of a playback device having playback means for playing back the special playback data played back by the playback means, the number of pixels per screen being higher than that of the special playback data. A first conversion procedure for converting the first image signal into a large number of first image signals; and a second conversion step for converting the first image signal into a second image signal having a larger number of pixels per screen than the first image signal. And causing the computer to execute a conversion procedure and an output procedure for outputting the first image signal and the second image signal.

  According to the present invention, the special reproduction of the first image signal (low resolution) and the second image signal (high resolution) can be executed by simple video processing without performing complicated processing.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of a magnetic tape reproducing apparatus according to an embodiment of the present invention. In this embodiment, an SD video output unit and an HD video output unit are provided. The SD video output unit performs video output of a 525i / 60 system (hereinafter referred to as SD60) or a 625i / 50 system (hereinafter referred to as SD50). On the other hand, the HD video output unit performs video output of a 1080i / 60 system (hereinafter referred to as HD60) or a 1080i / 50 system (hereinafter referred to as HD50). In addition, the magnetic tape to be reproduced is recorded with normal reproduction data and special reproduction data in which the video signal is encoded by MP @ H-14 of MPEG2. Note that the normal reproduction data and special reproduction data are recorded in independent recording areas on the magnetic tape. Further, it is assumed that special reproduction data is recorded in an area according to a scanning locus scanned by the magnetic head when the tape is conveyed at high speed during special reproduction. Further, it is assumed that the data for one frame of the special reproduction data is divided into a plurality of portions and recorded in discrete recording areas on the magnetic tape.

  The magnetic tape reproducing apparatus according to the present embodiment includes an operation unit 101, a CPU 102, a reproducing unit 104, a data separating unit 105, a special reproduction data processing unit (first conversion means) 106, a RAM 107, a video signal processing unit (first 2), a display unit 109, a digital / analog conversion (D / A) unit 110 for SD video, a digital / analog conversion (D / A) unit 111 for HD, and a normal reproduction decoding processing unit 112. ing.

  The operation unit 101 is configured such that at least a normal reproduction instruction and a special reproduction instruction can be input. The CPU 102 controls the entire magnetic tape reproducing apparatus such as the data separation unit 105 and the video signal processing unit 108 based on a program stored in a storage medium such as a ROM. The playback unit 104 plays back video data recorded on the magnetic tape 103. The data separation unit 105 separates normal reproduction data or special reproduction data from the video data (reproduction data) output from the reproduction unit 104 based on an instruction from the CPU 102 and outputs the separated data.

  The special reproduction data processing unit 106 temporarily stores the special reproduction data output from the data separation unit 105 in the RAM 107, and performs an enlargement process when the special reproduction data for one frame is acquired. On the other hand, the normal reproduction decoding processing unit 112 decodes and outputs the normal reproduction data output from the data separation unit 105 according to the MPEG system.

  The video signal processing unit 108 performs image processing such as resolution conversion on the video data processed by the special playback data processing unit 106 or the normal playback decoding processing unit 112. The display unit 109 displays the video data output from the video signal processing unit 108. The D / A units 110 and 111 convert the digital signal output from the video signal processing unit 108 into an analog signal and output the analog signal.

  Next, the operation of the magnetic tape reproducing apparatus according to this embodiment configured as described above will be described.

  First, the operation during normal playback will be described.

  When the CPU 102 receives a signal indicating a normal reproduction instruction from the operation unit 101, the CPU 102 causes the reproduction unit 104 to reproduce the video data recorded on the magnetic tape 103. The reproduction unit 104 outputs the reproduced video data (reproduction data) to the data separation unit 105. Next, the data separation unit 106 separates the normal reproduction data from the input reproduction data and supplies it to the normal reproduction decoding processing unit 112.

  The normal reproduction decoding processing unit 112 decodes the supplied normal reproduction data according to the MPEG system, and then supplies the decoded data to the video signal processing unit 108. The video signal processing unit 108 reduces and outputs the supplied normal reproduction data in accordance with the resolution (number of pixels) of the display unit 109, and the display unit 109 displays this. The video signal processing unit 108 outputs the normal playback data as an HD resolution digital video signal to the HD D / A unit 111, converts the normal playback data to the resolution of the SD video signal, To the D / A unit 110 for use. The D / A unit 110 then outputs an SD resolution analog video signal. The D / A unit 111 outputs an analog video signal with HD resolution.

  Next, the operation during special playback will be described.

  When the CPU 102 receives a signal indicating a special reproduction instruction from the operation unit 101, the CPU 102 causes the reproduction unit 104 to reproduce the video data while conveying the magnetic tape 103 at a higher speed than during normal reproduction. The reproduction unit 104 outputs video data (reproduction data) acquired by high-speed reproduction to the data separation unit 105. The data separation unit 105 separates the special reproduction data from the input reproduction data and supplies it to the special reproduction data processing unit 106.

  The special reproduction data processing unit 106 temporarily stores the supplied special reproduction data in the RAM 107. Since the special reproduction data is divided into a plurality of portions and recorded in discrete recording areas on the tape, the special reproduction data sequentially reproduced from these recording areas is stored in the RAM 107. It becomes. Then, the special reproduction data processing unit 106 performs an enlargement process at the stage of acquiring the special reproduction data for one frame.

  Here, a method for expanding the special reproduction data to the special reproduction video signal of SD60 or SD50 will be described.

  The special reproduction data is generated by extracting only the DC component coefficient from the DCT block of the I picture of the encoded main picture (normal reproduction) data. Therefore, as shown in FIG. 2, the special reproduction data is composed of 4: 2: 0 component signals in the horizontal direction 1440 ÷ 8 = 180 samples and the vertical direction 1088 ÷ 8 = 136 lines (effective video area 135 lines). Can be considered.

  Therefore, in the case of SD60, the special reproduction data for one frame converted from the 4: 2: 0 component signal (special reproduction video signal) to the 4: 2: 2 component signal and the effective video area in one field in SD60 The resolution ratio is as follows. That is, the resolution ratio between the luminance signal Y and the color difference signal Cb / Cr is 1: 4 in the horizontal direction and 9:16 in the vertical direction. If coordinate mapping is performed from this resolution ratio, the horizontal direction can be enlarged four times by holding four samples for one sample of the special reproduction data. As for the vertical direction, as shown in FIG. 3a, it is possible to expand the special reproduction data from 9 lines to 16 lines by holding the expanded line, and this is repeated 15 times in the same cycle. SD60 playback image can be expanded to one field. Thus, in this embodiment, enlargement is performed by oversampling special reproduction data.

  In the case of SD50, the resolution ratio between the special playback data for one frame converted from the 4: 2: 0 component signal to the 4: 2: 2 component signal and the effective video area in one field in SD50 is as follows. It becomes like this. That is, the resolution ratio of the luminance signal Y and the color difference signal Cb / Cr signal is both 1: 4 in the horizontal direction and 15:32 in the vertical direction. If coordinate mapping is performed from this resolution ratio, the horizontal direction can be enlarged four times by holding four samples for one special reproduction data sample. As for the vertical direction, as shown in FIG. 3b, it is possible to expand the special reproduction data from 15 lines to 32 lines by holding the expanded line, and this is repeated 9 times in the same cycle. SD50 playback image can be expanded to one field.

  The special reproduction data processing unit 106 converts the special reproduction video signal (first image signal) obtained by such enlargement processing into an ITU-R BT. A timing reference code is added in a format conforming to 656 and supplied to the video signal processing unit 108 as a 4: 2: 2 component signal.

  The video signal processing unit 108 outputs the supplied video signal to the display unit 109 and also outputs it to the SD D / A unit 110. Subsequently, the D / A unit 110 converts it into an analog video signal and outputs it as an SD video signal (video signal).

  Further, the video signal processing unit 108 extracts the special reproduction data by sub-sampling the special reproduction video signal supplied from the special reproduction data processing unit 106. At this time, the special reproduction video signal corresponds to a video signal obtained by enlarging the special reproduction data by the zero-order hold method, as shown in FIGS. 3a and 3b. For this reason, it is possible to extract the original special reproduction data by sub-sampling the special reproduction video signal.

  When the special reproduction data is enlarged to the special reproduction video of SD60, as shown in FIG. 3a, the special reproduction data is enlarged, so as shown in FIG. 4a, every four pixels in the horizontal direction for 16 lines to 9 lines. 1 pixel is subsampled. Then, the special reproduction data for one frame is extracted by repeating this 15 times in the same cycle. On the other hand, when the special reproduction data is enlarged to the special reproduction video of SD50, since it is enlarged as shown in FIG. 3b, horizontal lines from 32 lines to 15 lines are shown as shown in FIG. 4b. One pixel is sub-sampled every four pixels in the direction. Then, the special reproduction data for one frame is extracted by repeating this 15 times in the same cycle.

  The video signal processing unit 108 holds each pixel of the special reproduction data acquired in this way for eight pixels in the horizontal direction. Each line is held in the vertical direction for 8 lines (holds 4 lines for each field). As a result, the special reproduction data is expanded to a special reproduction video signal of HD 60 or HD 50, that is, a special reproduction video signal (second image signal) having a normal reproduction size. Then, the video signal processing unit 108 outputs the special reproduction video signal to the HD D / A unit 111. Subsequently, the D / A unit 111 converts it into an analog video signal and outputs it as an HD video signal (video signal).

  As described above, according to the present embodiment, SD60 or SD50 special playback video and HD60 or HD60 special playback video can be obtained by simple video signal processing during special playback.

  Note that a recording device for recording video data on the magnetic tape may be provided in the reproducing apparatus. A recording medium other than the magnetic tape may be used.

  The embodiment of the present invention can be realized by, for example, a computer executing a program. Also, means for supplying a program to a computer, for example, a computer-readable recording medium such as a CD-ROM recording such a program, or a transmission medium such as the Internet for transmitting such a program is also applied as an embodiment of the present invention. Can do. The above program can also be applied as an embodiment of the present invention. The above program, recording medium, transmission medium, and program product are included in the scope of the present invention.

1 is a block diagram showing a configuration of a magnetic tape reproducing device according to an embodiment of the present invention. It is a figure which shows the data for special reproduction | regeneration. It is a figure which shows the method of expanding the data for special reproduction to special reproduction image SD60. It is a figure which shows the method of enlarging special reproduction data to special reproduction image SD50. It is a figure which shows the method of extracting the data for special reproduction | regeneration from special reproduction | regeneration image SD60. It is a figure which shows the method of extracting the data for special reproduction from special reproduction image SD50.

Explanation of symbols

101: Operation unit 102: CPU
103: Magnetic tape 104: Playback unit 105: Data separation unit 106: Data processing unit for special playback 107: RAM
108: Video signal processing unit 109: Display unit 110, 111: D / A unit 112: Normal reproduction decoding processing unit

Claims (9)

Reproducing means for selectively reproducing image data for normal reproduction recorded on a recording medium and encoding a video signal, and data for special reproduction generated using a part of the image data for normal reproduction ,
First conversion means for converting the special reproduction data reproduced by the reproduction means into a first image signal having a larger number of pixels per screen than the special reproduction data;
Second conversion means for converting the first image signal into a second image signal having a larger number of pixels per screen than the first image signal;
First output means for outputting the first image signal;
Second output means for outputting the second image signal;
A playback apparatus comprising:   The playback apparatus according to claim 1, wherein the first image signal is a video signal of a 525i / 60 system or a 625i / 50 system.   The playback apparatus according to claim 1 or 2, wherein the second image signal is a video signal of a 1080i / 60 system or a 1080i / 50 system.   The second conversion unit generates a third image signal having a smaller number of pixels per screen than the first image signal by thinning out pixels of the first image signal, and the third image 4. The reproduction apparatus according to claim 1, wherein a signal is converted into the second image signal.   5. The reproduction apparatus according to claim 1, wherein the first conversion unit generates the first image signal by oversampling the special reproduction data. 6.   The first conversion means is ITU-R BT. 6. The playback apparatus according to claim 1, wherein the first image signal is output to the second conversion unit by a digital video interface conforming to 656. 7.   The reproducing apparatus according to claim 1, wherein the recording medium is a magnetic tape. A reproduction step of selecting and reproducing the normal reproduction image data encoded in the video signal recorded on the recording medium and the special reproduction data generated using a part of the normal reproduction image data; ,
A first conversion step of converting the special reproduction data reproduced in the reproduction step into a first image signal having a larger number of pixels per screen than the special reproduction data;
A second conversion step of converting the first image signal into a second image signal having a larger number of pixels per screen than the first image signal;
An output step of outputting the first image signal and the second image signal;
A reproduction method characterized by comprising: Reproducing means for selecting and reproducing the normal reproduction image data encoded on the video signal recorded on the recording medium and the special reproduction data generated using a part of the normal reproduction image data. A program for causing a computer to execute control of a playback device having:
A first conversion procedure for converting the special reproduction data reproduced by the reproduction means into a first image signal having more pixels per screen than the special reproduction data;
A second conversion procedure for converting the first image signal into a second image signal having a larger number of pixels per screen than the first image signal;
An output procedure for outputting the first image signal and the second image signal;
That causes the computer to execute the program.

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