JP3528635B2 - Digital disk playback device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital disc reproducing apparatus for reproducing a digital disc recorded with a digital moving image signal or the like.

[0002]

2. Description of the Related Art Generally, a menu screen is recorded on a digital disc on which a digital moving image signal is recorded. Since this information is composed of character information that briefly indicates the contents of a moving image or the like, it is possible for the user to look at the reproduced image and find the desired moving image or the like. By the way, on this menu screen, it may not be possible to reproduce and display the actual compressed video that has been recorded. Therefore, as shown in FIG. Then, if the digest screen reduced according to the number of displayed images can be displayed, it is convenient for the user to easily confirm the content of the moving image. Note that the multi-angle function refers to recording video images proceeding in the same time in parallel as a plurality of different images.

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

[0004]

However, as shown in FIG.
As shown in Fig. 1, when the actual movie etc. is played back in sequence and the digest screen reduced according to the number of displayed images is displayed,
As shown in FIGS. 2 (d) and 2 (e), since the plurality of images displayed on the screen are rewritten one after another, the context of the plurality of images becomes unclear for the user, and the content of the moving image is checked on the contrary. It becomes difficult and inconvenient. Also, when playing back multiple images and displaying them on one digest screen, normal playback takes time,
There is a problem that the waiting time becomes long. Further, as hardware for realizing these functions, there is desired hardware that can simplify a circuit configuration such as a memory and process a moving image at high speed to create a digest screen.

Also, Japanese Patent Laid-Open Nos. 7-236109 and 7-236110 are applied to a digital still camera to display a plurality of still images on a single screen in a digest display, so that a moving image height like a digital disc is displayed. The present invention is applied to a medium in which an I picture which is an intra-frame coded image in an efficient coding system (MPEG system), a P picture which is an inter-frame coded image, and a B picture which is a bidirectional predictive coded image are recorded. I can't. That is, P
Picture and B picture cannot reproduce the image only by the frame.

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

[0007]

According to the present invention , in order to achieve the above-mentioned object, a digital disk in which images advancing within the same time are recorded in parallel as a plurality of different images is reproduced to reproduce the same time. A plurality of different images progressing on the digest screen as a plurality of reduced images each progressing in the same time, and the display position of each reduced image displayed on the digest screen is on the digest screen. A digital disc reproducing apparatus defined at a predetermined position, the rate adjustment for controlling writing of a compressed signal read from the digital disc and reading of the compressed signal while adjusting a code amount per frame. Buffer and a frame in the MPEG system in the compressed signal read from the rate adjustment buffer Decoding the signal of P-picture as a signal and inter-frame coded image of the I picture as an encoded image, and said plurality of condensation of the plurality of different images
When displaying as a small image on the digest screen
After playing and displaying the different images in sequence,
Designated from among the plurality of different images that are played in sequence
Display the specified image when displaying the specified image.
The display area other than the display area
And a display for displaying the reduced image composed of a predetermined number of reproduced I pictures and P pictures in response to the output signal of the decoding means on the digest screen. The plurality of different images composed of a buffer and I pictures and P pictures recorded on the digital disc are sequentially reproduced, the image size is reduced according to the number of displays, and the images are arranged and written in the display buffer. , Displaying the reduced image corresponding to all of the plurality of different images, and
Displayed on the digest screen as multiple reduced images
In this case, the plurality of different images are sequentially reproduced and displayed.
Of the plurality of different images that are sequentially reproduced after
When displaying the image specified from
Corresponding to other display areas except the display area that displays
There is provided a digital disc reproducing apparatus having a control unit for performing control for erasing an image .

Further, according to a preferred embodiment of the present invention, the control means is characterized by overwriting color data in order to erase an image composed of an I picture and a P picture.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. The present invention reproduces an image from a digital disc on which an image signal is compressed and recorded by using a predetermined image compression technique such as MPEG2 typified by a DVD (digital video disc) and has a multi-angle function. A plurality of simultaneously progressing images are reproduced from the one having a portion in which they are 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 disc reproducing apparatus according to the present invention, and FIG. 2 is a block diagram (a) showing in detail the MPEG decoder of FIG. 1 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, and FIG. 4 is a configuration of the frame buffer memory and I on the frame buffer memory when the image signal is NTSC.
FIG. 5 is an explanatory diagram showing pictures and a transfer process of pictures, 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 a memory configuration and I picture and P picture transfer processing on a frame buffer memory; FIG. 7 is a flowchart for explaining digest screen filling processing;
FIG. 8 is a flowchart for explaining the decoding process of the I picture and 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. It is a figure which shows an example of the video data input into a decoder when there are nine pieces.

The digital disc reproducing apparatus shown in FIG.
Although it is a VD player, it is a music-only CD or video CD,
It is a dual-purpose machine that can play other types of discs.
The information recorded on the disc D, which is a digital disc or a CD dedicated to music, is read by the pickup 1, the signal is amplified by the RF amplifier 2, and then the DVD / CD.
It is applied to the decoder / servo control circuit 3. DVD / C
The D decoder / servo control circuit 3 causes the SP (spindle) servo circuit 11 to perform the rotation control of the disk motor, the focus control of the pickup 1, etc., demodulates the EFM signal from the RF amplifier 2, and outputs the subcode data. Read. The rate adjusting buffer 36 absorbs fluctuations in the code amount used for decoding per unit time.

The second CPU 4 is a TOC (Tabl
The DVD / CD decoder / servo has a memory for temporarily storing the data read from the e Of Contents area in a predetermined table format and fetches the sub-code data according to the input information from the input instruction section 5. The control circuit 3 is controlled. The input instruction section 5 has, 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, and the display section 2
0 indicates an operation mode, device abnormality, or the like. 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 CD dedicated to music.

The circuit system shown in the alternate long and short dash line is a signal system for a digital disc, which is provided in addition to the signal system for the music-only CD, and includes the first CPU 6, ROM 7, and 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 and 25. The first CPU 6 controls the entire device by controlling the second CPU 4 and the MPEG decoder 9, and in particular, the DIGES of the input instruction section 5 is controlled.
When the T button is pressed, a digest command as described below is output to the MPEG decoder 9.

The MPEG decoder 9 is 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 the 8-bit data bus b1,
The compressed signal is restored to the image data necessary for displaying one normal screen, and the audio signal is expanded. The MPEG decoder 9 also sequentially reproduces images recorded by a multi-angle function composed of I pictures and P pictures recorded on a digital disc when displaying a digest screen as described later, and displays a predetermined number. After doing
When displaying an image composed of the next I picture and P picture, processing for deleting the 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 for obtaining a status which is a processing status of a program in the MPEG decoder 9, and a data address. A 7-bit data bus b3 for transmitting and receiving information and a control signal for controlling the MPEG decoder 9, and M
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 the digital audio signal demodulated by the MPEG decoder 9 into an analog signal, converts the RGB signal, the luminance signal and the 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 a signal of NTSC system or PAL system 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 clock of 13.5 MHz or 27 MHz suitable for the processing of the video signal processing circuit 10, and the crystal oscillator 25 3.57945 which is a color subcarrier for the NTSC / PAL encoder 23
MHz (NTSC) or 4.43361875MHz
(PAL) is generated.

Next, referring to FIG. 2, the MPEG decoder 9
Will be described in detail. As shown in FIG. 2A, M
The PEG decoder 9 is generally a RISC processor 31.
And 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 MPEG2.
It performs syntax decoding, two-dimensional IDCT, inverse quantization, motion vector calculation, and the like. 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, an MPEG2 bit stream is input to the rate adjustment buffer 36 (see FIG. 1), and its writing and reading are controlled. The bit stream read from the rate adjustment buffer 36 is decoded according to the syntax of MPEG2, decoded by the VLD (Huffman variable length code decoder 32 in FIG. 2A), then IQ (dequantized), and further. An image is reconstructed by performing IDCT (Inverse Discrete Cosine Transform), which is a conversion from the frequency space to the real space. For images encoded using other frames, the reference image address is calculated using the motion vector decoded and reconstructed from the bitstream, and the reference image read from the reference memory is read. Motion compensation is performed by adding the image to the IDCT result.

As the interfaces 33 to 35, the host bus interface 33 inputs the compressed data stream and sets the internal registers, and the video display processor 34 outputs the 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
It is 2 bits. Here, the processing amount of MPEG1 is 1/6 or less and the memory bandwidth is 1/4 or less as compared with MPEG2. Therefore, in order to process MPEG1 and MPEG2, a decoding process is manufactured so as to correspond to the processing amount of MPEG2. The actual pixel rate of MPEG2 is about 11 MHz assuming a SIF (source input format) image, and most of the decoding process is a 32-bit, RISC operating at 80 MHz.
Can be performed by sequential processing. MPEG1 and C
The sequential processing of D is also performed without changing the operating frequency (80 MHz).

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

The digest frame buffer provided in the DRAM 8 is an I picture buffer, a P picture buffer, and a digest
Each of the I picture buffer, P picture buffer, and digest picture buffer is composed of a luminance (luminance signal) data area and a chrominance (color signal) data area. When the I picture has been decoded on the I picture buffer and the P picture has been decoded on the P picture buffer, the data is vertically and horizontally thinned to 1/4 to be reduced to 1/16. Transferred to picture buffer.

The display processing of the digest screen will be described with reference to FIGS. The DVD to be played now is shown in Figure 1.
As shown in 1, when a plurality of images are recorded by the multi-angle function, these are reduced and displayed in digest form. The image of each angle 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 erased (B = 1) or not erased (B = 0),
Normally, the following nine types of commands are output.

[0022]

[Table 1]

Upon starting the processing shown in FIG. 7 and accepting the digest command (step S1), it is determined whether or not the current digest mode is set (step S).
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), in the case of YES the process proceeds to step S6, while on the other hand N
If it is O, the process proceeds to step S7.

If the digest mode is not set in step S2, the digest mode is set (step S4), and then the display buffer as shown in FIG. 4 or 6 is set (step S5). Next, fill the background color of the digest screen (step S
6) Next, areas for reduced images “1” to “9” are set on the display buffer as shown in FIG. 4 or 6 (step S7), and then the “play” process shown in FIG. 8 is performed. In the process of filling the background color in step S6, a different color can be set for each background, and "overwrite" can be used instead of "background color fill".
But it's okay.

When the start code is detected in FIG. 8 (step S11), it is judged whether or not the pictures have the same angle (step S12). If YES, it is judged whether or not the start code is an I picture (step S1).
3) If YES, the process proceeds to step S14 and below, while if NO, the process proceeds to step S17. Step S
14 decodes the I picture on the I picture buffer shown in FIG. 4 or 6, and when decoding of one frame of I picture is completed (step S15), the data is reduced to 1/16 and Alternatively, it is transferred to the 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 this is the last picture to be decoded after playing. Yes
In case of, it returns to step S11. If 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 thereafter, while if NO, step S1.
Return to 1. At step S19, the P picture is decoded on the P picture buffer shown in FIG. 4 or 6, and when the decoding of the P picture for one frame is completed (step S20), the data is reduced to 1/16 and Four
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 processes shown in FIGS. 7 and 8 are 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 by and the process returns to step S22. When all the angles have been displayed, this digest screen display processing ends. When the digest command is (9,0), this processing results in FIG.
As shown in (c), when the reduced images “1” to “9” are sequentially displayed and then the display of the nine images “1” to “9” ends, the next image “1” is displayed. Other image "2"
~ "9" is deleted. If the angle display is not designated, for example, as shown in FIG. 10D, the reduced image “2” is displayed in the case of the digest command (2, 1).
Only the image is displayed and the background color is applied to the other areas, and the process stops 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, the next image is displayed. When an image composed of I-pictures and P-pictures is displayed, the image composed of I-pictures and P-pictures in other areas is erased, so that it is easy to see multiple images recorded by the multi-angle function on the digest screen. Can be displayed.

[Brief description of drawings]

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

2 is a block diagram (a) showing in detail the MPEG decoder of FIG. 1 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 filling process of a digest screen.

[Fig. 8] Fig. 8 is a flowchart for explaining a decoding process of an I picture and a P picture.

FIG. 9 is a flowchart illustrating a digest screen display process.

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

FIG. 11 is an explanatory diagram showing a state of decoding and reproducing an I picture and a P picture of multi-angle multiple image data recorded on a digital disc.

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

FIG. 13 is a flowchart for explaining a digest screen display process in a conventional digital still camera.

[Explanation of symbols]

3 DVD / CD decoder / servo control circuit 5 Input instructing section 6 First CPU 8 DRAM (part of which constitutes display buffer) 9 MPEG decoder (DVD / CD decoder / servo control circuit 3 and first CPU 6 together with decoding means and control 36) Buffer D digital disc for rate adjustment

Claims (2)

(57) [Claims] 1. A plurality of different images, each of which progresses within the same time, are reproduced by reproducing a digital disc in which videos progressing within the same time are recorded in parallel as a plurality of different images. Of the reduced image displayed on the digest screen as a reduced image, and the display position of each reduced image displayed on the digest screen is a digital disc reproducing apparatus defined at a predetermined position on the digest screen, A rate adjustment buffer that controls writing of the compressed signal read from the digital disk and reading of the compressed signal while adjusting the code amount per frame; and the compressed signal read from the rate adjustment buffer. Medium, I-picture signal as an intra-frame coded image and inter-frame code in the MPEG system Decoding the signal of P-pictures in the image, and the plurality of different image
Image as the plurality of reduced images on the digest screen
If you want to display in the
After being displayed, the plurality of different images that are sequentially reproduced are displayed.
When displaying the image specified from among the images,
Applies to other display areas except the display area that displays the image
Decoding means for erasing the image, and, in response to the output signal of the decoding means, displaying the reduced image composed of a predetermined number of reproduced I pictures and P pictures on the digest screen. And a display buffer for reproducing the plurality of different images composed of I-pictures and P-pictures recorded on the digital disc, and reducing the image size in accordance with the number of displays to display in the display buffer. Arranging and writing, displaying the reduced image corresponding to all of the plurality of different images,
The digest as the plurality of reduced images
When displaying on the screen, the different images are
After the live display, the plurality of different
When displaying a specified image from among
In the other display area except the display area that displays the specified image
A digital disc reproducing apparatus, comprising: a control unit that performs control to erase the corresponding image . 2. The digital disc reproducing apparatus according to claim 1, wherein the control means overwrites color data in order to erase an image composed of an I picture and a P picture.