JP2000138899A - Digital disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a dynamic image recorded by a multi-angle function on a digital disk in a form of an easy to see digest image. SOLUTION: A DVD/CD decoder/servo control circuit 4, a 1st CPU 6 and an MPEG decoder 9 sequentially reproduce and reduce an image, consisting of I and P pictures. In the case of displaying a succeeding picture consisting of next I and P pictures after displaying a prescribed number of pictures, of picture consisting of I and P pictures in other area is deleted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital disk reproducing apparatus for reproducing a digital disk on which digital moving picture signals and the like are recorded.

[0002]

2. Description of the Related Art A menu screen is usually recorded on a digital disk on which a digital moving picture signal or the like is recorded. Since this information is composed of character information that briefly indicates the content of a moving image or the like, the user can look at the reproduced image and find the desired moving image. By the way, on this menu screen, there is a case where it is not possible to reproduce and display an actual moving image or the like recorded in a compressed state, so that the actual moving image or the like is reproduced by the multi-angle function as shown in FIG. If a digest screen reduced according to the number of displayed images can be displayed, the user can easily check the contents of the moving image, which is convenient. Note that the multi-angle function refers to recording video proceeding within the same time as a plurality of different images in parallel.

As a conventional example of displaying a digest screen, there is known a digital still camera as disclosed in, for example, JP-A-7-236109 and JP-A-7-236110. . FIG.
Indicates the former method. When the release button is turned on (step S101), it is determined whether normal shooting or continuous shooting is to be performed (step S102). Then, in the case of normal photographing, one-frame control is performed (step S103) and recorded in the buffer memory (steps S104 and S105). Also,
In the case of continuous shooting, the number n 'of continuously shot frames is determined, n' frame control is performed (steps S106 and S107), and the frame is recorded in the buffer memory (steps S104 and S105).

[0004]

However, FIG.
As shown in FIG. 1, when an actual moving image or the like is sequentially reproduced and a digest screen reduced according to the number of displayed images is displayed, FIG.
Since the plurality of images displayed on the screen are rewritten one after another as shown in 2 (d) and (e), the context of the plurality of images becomes unclear for the user, and on the contrary, the content of the moving image is confirmed. However, there is a problem that it becomes difficult and inconvenient. In addition, when a plurality of images are reproduced and displayed on one digest screen, it takes time in normal reproduction,
There is a problem that the waiting time becomes long. Further, as hardware for realizing these functions, a hardware that can simplify a circuit configuration such as a memory and process a moving image at high speed to create a digest screen is desired.

Japanese Patent Application Laid-Open Nos. Hei 7-236109 and Hei 7-236110 apply a digital still camera to display a plurality of still images in a digest on a single screen. The present invention is applied to a medium in which an I picture which is an intra-frame coded image, a P picture which is an inter-frame coded image, and a B picture which is a bidirectional predictive coded image in the efficiency coding system (MPEG system). Can not do. That is, P
A picture and a B picture cannot reproduce an image only by the frame.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, the present invention provides a digital disk reproducing apparatus capable of displaying a moving image recorded on a digital disk, in particular, a plurality of simultaneously proceeding images recorded by a multi-angle function, on an easy-to-view digest screen. The purpose is to provide.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention sequentially reproduces an image composed of an I picture and a P picture recorded on a digital disc, reduces the picture, and displays a predetermined number of pictures. When displaying an image composed of the next I picture and P picture, an image composed of the I picture and P picture in another area is deleted. That is, according to the present invention, a rate adjusting buffer for controlling writing of a compressed signal read from a digital disk and reading of the compressed signal while adjusting the code amount per frame, and the rate adjusting buffer Decoding means for decoding an I-picture signal as an intra-frame coded image and a P-picture signal as an inter-frame coded image in the MPEG system among the compressed signals read from In response, a display buffer for displaying on the digest screen an image composed of a predetermined number of reproduced I-pictures and P-pictures, and composed of I-pictures and P-pictures recorded on the digital disk Images are sequentially reproduced, the image size is reduced according to the number of displayed images, and the images are arranged in the display buffer and written. Control means for erasing an image composed of an I picture and a P picture in another area when writing the next I picture and P picture after writing the predetermined number. You.

According to a preferred embodiment of the present invention, the control means overwrites color data in order to erase an image consisting of an I picture and a P picture.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The present invention reproduces an image from a digital disk on which an image signal is compressed and recorded by using a predetermined image compression technology such as MPEG2 represented by a DVD (digital video disk), and uses a multi-angle function. A plurality of simultaneously proceeding images are reproduced from an image having a portion where the image is similarly compressed and recorded.
Therefore, the embodiment of the present invention will be described by taking a DVD using MPEG2 as an example. FIG. 1 is a block diagram showing an embodiment of a digital disk reproducing apparatus according to the present invention. FIG. 2 is a block diagram (a) showing the MPEG decoder in FIG. 1 in detail and a block diagram (b) showing a signal processing procedure. FIG. 3 is an explanatory view showing a digest screen of a plurality of images recorded by the multi-angle function when the image signal is NTSC. FIG. 4 is a diagram showing the structure of the frame buffer memory and the I on the frame buffer memory when the image signal is NTSC.
FIG. 5 is an explanatory diagram showing a picture and a picture transfer process, FIG. 5 is an explanatory diagram showing a digest screen of a plurality of images recorded by the multi-angle function when the image signal is PAL, and FIG. 6 is a frame buffer when the image signal is PAL. FIG. 7 is an explanatory diagram showing the configuration of a memory and transfer processing of an I picture and a P picture on a frame buffer memory. FIG.
FIG. 8 is a flowchart for explaining the decoding process of the I picture and the P picture, FIG. 9 is a flowchart for explaining the display process of the digest screen, FIG. 10 is an explanatory diagram showing an example of the digest screen, and FIG. FIG. 6 is a diagram illustrating an example of video data input to a decoder when there are nine.

The digital disk reproducing apparatus shown in FIG.
It is a VD playback device.
Other types of discs can also be played.
The information recorded on a digital disk or a disk D of a music-only CD is read by a pickup 1, and the signal is amplified by an RF amplifier 2, and then the DVD / CD is read.
Applied to the decoder / servo control circuit 3. DVD / C
The D decoder / servo control circuit 3 controls the SP (spindle) servo circuit 11 to control the rotation of the disk motor and the focus of the pickup 1, demodulate the EFM signal from the RF amplifier 2, and control the subcode data. Read. The rate adjusting buffer 36 absorbs fluctuations in the amount of code used for decoding per unit time.

[0011] The second CPU 4 is provided with the TOC (Tabl
e Of Contents), a memory for temporarily storing data read from the area in a predetermined table format, and fetching sub-code data, and according to input information from the input instruction unit 5, a DVD / CD decoder / servo. The control circuit 3 performs control. The input instructing unit 5 includes, for example, a PLAY button, a STOP button, an FF button, an RF button, a DIGEST (digest) button, a JUMP (jump) button, and the like.
0 indicates an operation mode or an abnormality of the apparatus. The audio signal processing circuit 15 converts the reproduced digital audio signal into an analog signal and performs de-emphasis processing. The above circuit is a circuit for reproducing a music-only CD.

A circuit system shown in a dashed line is a signal system for a digital disk provided in addition to the signal system of the music dedicated CD, and includes a first CPU 6, a ROM 7, a D
It has a RAM 8, an MPEG decoder 9, a video signal processing circuit (SSG) 10, an NTSC / PAL encoder 23, and crystal oscillators 21, 24, 25. The first CPU 6 controls the entire apparatus by controlling the second CPU 4 and the MPEG decoder 9.
When the T button is pressed, a digest command described later is output to the MPEG decoder 9.

The MPEG decoder 9 has a ROM 7 in which a program for controlling the entire apparatus is stored in advance.
And a DRAM 8 for storing a compressed signal for a digital disk input from the DVD / CD decoder / servo control circuit 3 via an 8-bit data bus b1,
The compressed signal is restored to image data necessary for displaying one normal screen, and the audio signal is expanded. When displaying a digest screen as described later, the MPEG decoder 9 sequentially reproduces images recorded by a multi-angle function composed of I-pictures and P-pictures recorded on a digital disc to display a predetermined number. After doing
When displaying an image composed of the next I picture and P picture, a process for deleting an image composed of the I picture and P picture in another area is performed.

Between the MPEG decoder 9 and the first CPU 6, an 8-bit data bus b2 for transmitting mode information and obtaining the status of the processing status of the program in the MPEG decoder 9, and a data address A 7-bit data bus b3 for transmitting and receiving information and transmitting a control signal for controlling the MPEG decoder 9;
It is connected via a 1-bit data bus b4 for obtaining input information of a data string input to the PEG decoder 9 and a 3-bit data bus b5 for audio status.

The video signal processing circuit 10 converts a digital audio signal demodulated by the MPEG decoder 9 into an analog signal, or converts an RGB signal, a luminance signal and a color difference signal into a composite signal, and outputs the composite signal to the NTSC / PAL encoder 23. , NTSC / PAL encoder 23
Converts this composite signal into an NTSC or PAL signal and outputs it to an external display. The crystal oscillator 21 generates a master clock for operating the MPEG decoder 9, the crystal oscillator 24 generates a 13.5 MHz or 27 MHz clock suitable for processing of the video signal processing circuit 10, and the crystal oscillator 25 generates 3.55795 which is a chrominance subcarrier for the NTSC / PAL encoder 23
MHz (NTSC) or 4.43361875 MHz
(PAL).

Next, referring to FIG.
Will be described in detail. As shown in FIG.
The PEG decoder 9 is roughly a RISC processor 31
, A Huffman variable length code decoder (VLD) 32, three interfaces 33 to 35, and a FIFO 37. The RISC processor 31 not only controls the VLD 32 and the interfaces 33 to 35, but also controls the MPEG2
It decodes syntax, performs two-dimensional IDCT, inverse quantization, and calculates motion vectors. The address control signal is directly transmitted and received between the host bus interface 33 and the bus BL, but the data is transmitted via the FIFO 37.

That is, as shown in FIG. 2B, the MPEG2 bit stream is input to the rate adjusting buffer 36 (see FIG. 1), and its writing and reading are controlled. The bit stream read from the rate adjusting buffer 36 is decoded according to the syntax of MPEG2, decoded by VLD (the Huffman variable length code decoder 32 in FIG. 2A), and then IQ (dequantized). An IDCT (Inverse Discrete Cosine Transform), which is a transform for returning from the frequency space to the real space, is performed, and the image is restored. For an image encoded using another frame, the address of the reference image is calculated using the motion vector decoded and reconstructed from the bit stream, and the reference image read from the reference memory is calculated. Motion compensation is performed by adding the image to the IDCT result.

As interfaces 33 to 35, the host bus interface 33 performs input of a compressed data stream and setting to an internal register, and a video display processor 34 outputs a decoded image.
The DRAM controller 35 controls the DRAM 8 shown in FIG. The DRAM 8 has a maximum size of 4 Mbytes and is used as a rate buffer, a reference image memory, a display memory (buffers shown in FIGS. 4 and 5), and a RISC instruction memory. Interface with DRAM8 is 3
Two bits. Here, the processing amount of MPEG1 is 1/6 or less and the memory bandwidth is 1/4 or less of MPEG2. Therefore, in order to process MPEG1 and MPEG2, a decoding process is manufactured corresponding to the processing amount of MPEG2. The actual pixel rate of MPEG2 is about 11 MHz assuming an SIF (Source Input Format) image, and most of the decoding process is performed by a 32 bit, RISC operating at 80 MHz.
Can be performed by sequential processing using. MPEG1 and C
The sequential processing of D is also performed without changing the operating frequency (80 MHz).

In such a configuration, when a digest screen is displayed, for example, as shown in FIG.
3 = 9 vertical reduced images are displayed on one screen. In this case, when the video signal is NTSC, one screen, that is, a raster is composed of 720 horizontal pixels × 480 vertical lines, and three images in the main scanning direction are 45 to 224 pixels, respectively.
The image is displayed at the 270th to 449th pixels and the 495th to 674th pixels. The three images in the sub-scanning direction are respectively the 30th to 149th lines, the 180th to 299th lines,
It is displayed on the 330th to 449th lines. When the video signal is PAL, as shown in FIG. 5, the number of pixels in the horizontal direction (main scanning direction) of the screen and the arrangement of the images in the horizontal direction are NT.
As in the case of SC, the number of lines in the vertical direction (sub-scanning direction) of the screen is 576, and three images in the sub-scanning direction are the 36th to 179th lines and the 216th to 3rd lines, respectively.
It is displayed on the 59th line and the 396th to 539th lines.

The digest frame buffer provided in the DRAM 8 includes an I picture buffer, a P picture buffer, and a digest picture buffer having sizes as shown in FIG.
The I-picture buffer, the P-picture buffer, and the digest-picture buffer each include a luminance (luminance signal) data area and a chrominance (color signal) data area. When the decoding of the I picture is completed on the I picture buffer and the decoding of the P picture is completed on the P picture buffer, the data is thinned down to 1/16 in both the vertical and horizontal directions and reduced to 1/16. Transferred to picture buffer.

The processing for displaying the digest screen will be described with reference to FIGS. Now, the DVD to be played is shown in FIG.
As shown in FIG. 1, when a plurality of images are recorded by the multi-angle function, these are reduced and displayed in a digest form. Each angle image is composed of I, P, and B pictures by MPEG2 compression.
First, the first CPU 6 outputs the following digest command (A, B) to the MPEG decoder 9.
“A” indicates image numbers “1” to “9”, which correspond to angle numbers. “B” indicates whether images other than the image number “A” are to be deleted (B = 1) or not to be deleted (B = 0).
Normally, the following nine types of commands are output.

[0022]

[Table 1]

When the process shown in FIG. 7 is started and the above digest command is received (step S1), it is determined whether or not the current mode is the digest mode (step S1).
2). Then, in the case of YES, it is determined whether or not the digest command is a reduced image deletion command (Step S).
3) If YES, proceed to step S6, while N
In the case of O, the process proceeds to step S7.

If the mode is not the digest mode in step S2, the digest mode is set (step S4), and then the display buffer as shown in FIG. 4 or FIG. 6 is set (step S5). Next, the background color of the digest screen is painted out (step S
6) Then, areas for the reduced images "1" to "9" are set on the display buffer as shown in FIG. 4 or FIG. 6 (step S7), and then the process proceeds to the "play" process shown in FIG. In the process of filling the background color in step S6, a different color can be set for each background, and "overwrite" is used instead of "background color fill".
May be.

In FIG. 8, when a start code is detected (step S11), it is determined whether or not the picture has the same angle (step S12). If YES, it is determined whether or not the start code is an I picture (step S1).
3) If YES, go to step S14 and below, and if NO, go to step S17. Step S
In step 14, the I picture is decoded on the I picture buffer shown in FIG. 4 or FIG. 6, and when the decoding of one frame of I picture is completed (step S15), the data is reduced to 1/16 and Alternatively, it is transferred to a digest picture buffer (also referred to as a digest display (display) buffer) shown in FIG. 6 (step S16). When step S16 ends, step S1
Return to 1.

On the other hand, in step S17, it is determined whether or not the picture is to be decoded last after playing. YES
In the case of, the process returns to step S11. In the case of NO, the process proceeds to step S18. In step S18, it is determined whether or not the start code is a P picture. If YES, the process proceeds to step S19 and the following steps.
Return to 1. In step S19, the P picture is decoded on the P picture buffer shown in FIG. 4 or FIG. 6, and when the decoding of one frame of P picture is completed (step S20), the data is reduced to 1/16. 4
Alternatively, the digest picture buffer shown in FIG. 6 (also referred to as a digest display (display) buffer)
(Step S21). When step S21 ends, the process returns to step S11.

Then, as shown in FIG. 9, the processing shown in FIGS. 7 and 8 is processed as one unit (step S2).
2) Then, it is determined whether or not all angles have been displayed (step S23). If NO, step S24
The command is incremented, and the process returns to step S22. If all angles have been displayed, the digest screen display processing ends. When the digest command is (9, 0), this process causes the processing shown in FIGS.
As shown in (c), when the reduced images “1” to “9” are sequentially displayed, and when the display of the nine images “1” to “9” ends, the next image “1” is displayed. Other image "2"
To “9” are deleted. When the angle display is not specified, for example, as shown in FIG. 10D, in the case of the digest command (2, 1), the reduced image “2” is displayed.
Only the area is displayed and the other areas are subjected to background color filling processing, and the operation is stopped at this image.

[0028]

As described above, according to the present invention, an image composed of an I picture and a P picture recorded on a digital disc is sequentially reproduced to reduce the image size, and after displaying a predetermined number, When displaying an image composed of I-pictures and P-pictures, an image composed of I-pictures and P-pictures in other areas is deleted, so that a plurality of images recorded by the multi-angle function can be easily viewed on a digest screen. Can be displayed.

[Brief description of the drawings]

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

FIG. 2 is a block diagram (a) showing the MPEG decoder of FIG. 1 in detail, and a block diagram (b) showing a signal processing procedure.

FIG. 3 is an explanatory diagram showing a digest screen in the case of NTSC.

FIG. 4 is an explanatory diagram showing a configuration of a frame buffer memory in the case of NTSC.

FIG. 5 is an explanatory diagram showing a digest screen in the case of PAL.

FIG. 6 is an explanatory diagram showing a configuration of a frame buffer memory in the case of PAL.

FIG. 7 is a flowchart illustrating a process of filling a digest screen.

FIG. 8 is a flowchart illustrating a decoding process of an I picture and a P picture.

FIG. 9 is a flowchart illustrating a process of displaying a digest screen.

FIG. 10 is an explanatory diagram showing an example of a digest screen.

FIG. 11 is an explanatory diagram showing a state in which an I picture and a P picture of multi-angle plural image data recorded on a digital disk are decoded and reproduced.

FIG. 12 is an explanatory diagram showing an example of a conventional digest screen.

FIG. 13 is a flowchart illustrating a process of displaying a digest screen in a conventional digital still camera.

[Explanation of symbols]

Reference Signs List 3 DVD / CD decoder / servo control circuit 5 Input instruction unit 6 First CPU 8 DRAM (part of which constitutes a display buffer) 9 MPEG decoder (Decoding means and control together with DVD / CD decoder / servo control circuit 3 and first CPU 6) 36) Rate adjusting buffer D Digital disk

Continued on front page F-term (reference) 5C052 AA02 AA17 AB05 AC05 AC08 BB04 BB06 CC11 CC20 DD06 DD08 5C053 FA05 FA24 GB02 GB08 GB19 GB21 GB22 GB26 GB30 GB37 GB38 HA30 HA33 JA21 KA01 KA03 KA18 KA22 KA24 5C059 KK23 MA01 PP07 PP14 SS13 SS30 UA05 UA29 UA32

Claims (2)

[Claims] 1. A rate adjusting buffer for controlling writing of a compressed signal read from a digital disk and reading of the compressed signal while adjusting a code amount per frame, and reading from the rate adjusting buffer. Decoding means for decoding an I-picture signal as an intra-frame coded image and a P-picture signal as an inter-frame coded image in the MPEG system, in response to the output signal of the decoding means, A display buffer for displaying, on a digest screen, an image composed of a predetermined number of reproduced I pictures and P pictures; and sequentially displaying an image composed of I pictures and P pictures recorded on the digital disk. Reproduce, reduce the image size according to the number of displays, arrange in the display buffer and write, Control means for erasing an image composed of an I picture and a P picture in another area when writing the next I picture and P picture after writing a predetermined number. 2. The digital disk reproducing apparatus according to claim 1, wherein said control means overwrites color data to erase an image composed of an I picture and a P picture.