JPH11313316A - Optical disk reproduction method and optical disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display a significant image by which the contents of the image are grasped by skipping a monochromatic image such as a black/white image whose contents are hardly grasped even for a moving image started from the monochromatic image. SOLUTION: A CPU extracts a head address of moving image data to be displayed (step 102) and calculates an address after a prescribed time from a time indicated by the head address (step 103). The CPU moves an optical head to the calculated address location on an optical disk to read the data (step 104) and inputs the data to an MPEG decoder (step 105). When the CPU detects an I picture in the data after the calculated address, the CPU reduces and processes the image data decoded from the I picture detected first and displays the data on a display device (step 106).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk reproducing method and an optical disk reproducing apparatus for reproducing an optical disk on which audio / moving image data encoded by the MPEG system is recorded, and more particularly to a digest screen of a moving image recorded on an optical disk. The present invention relates to an optical disc reproducing method and an optical disc reproducing apparatus for displaying an image.

[0002]

2. Description of the Related Art In recent years, attention has been focused on recording moving image data for a long time on an optical disk such as a video compact disk (video CD). In order to record moving image data for a long time, it is necessary to reduce the amount of data by compressing the data. Therefore, various techniques for compressing moving image data have been proposed, and the MPEG method has been adopted for video CDs. By the way, in order to check the contents of the moving image recorded on the optical disk, it is effective if the recorded moving image can be sequentially read out and a list of contents (digest screen) in which reduced images are arranged can be displayed.

FIG. 5 is a flowchart for explaining a digest screen display operation of a conventional optical disk reproducing apparatus. First, a table recorded at a predetermined position on the optical disk is read out, and the addresses (minutes, seconds, frames) of all the moving image data recorded on the optical disk are stored (step 201 in FIG. 5). Subsequently, the head address of the moving image data to be displayed is extracted (step 20).
2), the optical head is moved to the position of the head address to read data from the optical disk (step 203),
The read data is input to the MPEG decoder (step 204). Then, an I picture of an MPEG image (intra-coded image: Intr
When a coded picture is detected, image data obtained as a result of decoding the first detected I picture by the MPEG decoder is reduced and displayed on a display device (step 205). Such an operation is repeated as long as moving image data remains on the optical disk (step 206).

[0004]

In the above display method, a reduced image of an I picture which is first detected in data after the head address is displayed. For this reason,
For example, when there are a plurality of sets of moving images as shown in FIG. 6 that gradually become brighter from a dark screen, and the reduced images at the head of each group are arranged, only the dark reduced image 21 as shown in the digest screen 20 of FIG. Are arranged, so that it is impossible to determine what kind of moving image is recorded on the optical disc. There is also a method of detecting a luminance of an image and displaying a reduced image of an I picture when an image having a luminance equal to or higher than a certain luminance is input. In this case, in the case of a moving image starting from a white (bright) image, the reverse is performed. There is a problem that only white screens are lined up. The present invention
It was made in order to solve the above-mentioned problem, and even if it is a moving image starting from a monochromatic image whose content is difficult to grasp such as black and white,
It is an object of the present invention to provide an optical disk reproducing method and an optical disk reproducing apparatus capable of displaying a significant image whose contents can be grasped by skipping that part.

[0005]

According to a first aspect of the present invention, there is provided an optical disk reproducing method for reading and displaying an I picture a predetermined time after the beginning of moving image data to be displayed. It is. As described above, by reading and displaying the I picture at a predetermined time after the beginning of the moving image data to be displayed, even if the moving image starts with a monochrome image, such as black or white, whose content is difficult to grasp, that part can be displayed. By skipping, it is possible to display a significant image from which the content can be grasped. Further, as set forth in claim 2, a search for audio data is started from the beginning of moving image data to be displayed, and an I picture at a predetermined time after the detection of the audio data is read and displayed. It is. According to another aspect of the present invention, there is provided an optical disk reproducing apparatus for reading data from an optical disk, displaying a digest screen, and displaying a digest screen for a predetermined time from the beginning of moving image data to be displayed. Control means for calculating the subsequent address, reproducing the data after this address by the reading means, reducing the detected I-picture, and displaying it on the display means. Further, as set forth in claim 4, the control means causes the reading means to reproduce the data from the head of the moving image data to be displayed and starts searching for the audio data, and a predetermined time from the detection of the audio data. The subsequent address is calculated, the data after this address is reproduced by the reading means, and the detected I picture is reduced and displayed on the display means.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] Next, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram of an optical disk reproducing apparatus according to a first embodiment of the present invention, and FIG. 2 is a flowchart for explaining a digest screen display operation of the optical disk reproducing apparatus. This optical disk reproducing apparatus includes an optical disk drive 2 serving as a reading means for reading data from an optical disk 1 such as a video CD, an MPEG decoder 3 for decoding audio / moving image data encoded by the MPEG system, and an MPEG decoder 3. An image memory 4 having a capacity of at least one frame for storing the decoded image data, a display controller 6 for displaying the image data stored in the image memory 4 on a display device 5, and control means for controlling the entire device. CPU7,
RAM 8 for storing addresses and the like of moving image data
And an input device 9 for a user to give a command.

Next, the operation of displaying a digest screen of such an optical disk reproducing apparatus will be described with reference to FIG. First, the CPU 7 stores the optical disk 1 in the optical disk drive 2.
Is mounted, the optical disk drive 2 reads the table recorded at a predetermined position on the optical disk 1.
In this table, the MPEG recorded on the optical disc 1 is stored.
Address of all encoded video data (minute, second,
Frame) is registered. Then, the CPU 7 stores the address of the acquired moving image data in the RAM 8 (Step 101 in FIG. 2).

Subsequently, the CPU 7 extracts the start address of the moving image data to be displayed from the RAM 8 (step 102), and calculates an address after a predetermined time from the time indicated by the start address (step 103). And C
The PU 7 reads the data from the optical disc 1 by moving the optical head of the optical disc drive 2 to the calculated address position on the optical disc 1 (step 104), and inputs the read data to the MPEG decoder 3 (step 1).
05).

[0009] The MPEG decoder 3 decodes MPEG encoded data. When the CPU 7 detects an I picture (Intra coded picture) of the MPEG image in the data after the calculated address, the result obtained by decoding the first detected I picture by the MPEG decoder 3 is obtained. The image data is reduced, and the reduced image data is written to a predetermined memory area in the image memory 4. The display controller 6 includes an image memory 4
Is converted into an analog image signal and given to the display device 5. Thus, the reduced image 11-1 as shown in FIG. 3A is displayed on the digest screen 10 of the display device 5 (step 106).

Next, the CPU 7 determines whether or not moving image data remains on the optical disc 1 based on the address stored in the RAM 8 (step 107). And the same operation is repeated. At this time, the obtained reduced image 11-2 based on the I picture is reduced as shown in FIG.
1 is written in a memory area of the image memory 4 that is different from the area where the reduced image 11-1 is written. By repeating the above operations, a digest screen 10 in which the reduced images 11-1 to 11-9 are arranged as shown in FIG. 3C is displayed.

In the conventional display method, since the I picture 31 at the position of the head address t1 shown in FIG. 6 is displayed,
When there are a plurality of sets of moving images as shown in FIG. 6, only dark reduced images 21 are arranged like the digest screen 20 of FIG. On the other hand, in the present embodiment, the start address t
Since the I picture 32 at the address t2 after a predetermined time from 1 is displayed, it is possible to display a significant digest screen that makes it easy to grasp the contents of the moving image recorded on the optical disc 1.

[Embodiment 2] FIG. 4 is a flowchart for explaining a digest screen display operation of an optical disc reproducing apparatus according to a second embodiment of the present invention.
The same operations as those in FIG. 2 are denoted by the same reference numerals. Also in the present embodiment, the configuration of the optical disc reproducing apparatus is the same as that of the first embodiment, and therefore, will be described with reference to FIG.

The operations in steps 101 and 102 are the same as those in the first embodiment. Next, the CPU 7 moves the optical disk drive 2 to the head address position of the moving image data to be displayed.
The optical head is moved to read data from the optical disk 1 (step 108), and the read data is
Input to the decoder 3 (step 109).

When the CPU 7 detects the MPEG encoded audio data in the data after the head address (step 110), it calculates an address two seconds after the time indicated by the address of the audio data (step 111).
The operations in steps 104 to 107 are the same as those in the first embodiment. Thus, a digest screen 10 similar to that of the first embodiment is displayed on the display device 5.

In this embodiment, a search for audio data is started from the beginning of moving image data to be displayed, and an I picture is displayed two seconds after the time indicated by the address of the detected audio data. This is because it may be difficult to appropriately set the predetermined time described in the first embodiment, and the detection of the audio data is performed when the audio data appears and the content is not a monochrome image. This is because it is considered that a possible moving image also appears. In the present embodiment,
Although the predetermined time is 2 seconds, it is not limited to this. In the present embodiment, the reason why the time is set to 2 seconds is that the arrangement interval of the I picture is specified to be a maximum of 2 seconds in the MPEG system.

Also, in the first and second embodiments, nine reduced images 11-1 to 11-9 are displayed in the digest screen 10, but the present invention is not limited to this, and another number may be used. Needless to say. The CPU 7 has 10
If the second reduced image is obtained from the optical disc 1,
All the displayed reduced images may be deleted to start new display, or a part of the displayed reduced images may be left, and a new reduced image may be arranged next to it.

[0017]

According to the present invention, by reading out and displaying an I picture a predetermined time after the beginning of moving image data to be displayed, a moving image starting from a monochrome image, such as black or white, whose contents are difficult to grasp. Even if there is, it is possible to display a significant image whose contents can be grasped by skipping that part. As a result, it is possible to easily and reliably grasp what kind of moving image is recorded on the optical disc.

[Brief description of the drawings]

FIG. 1 is a block diagram of an optical disk reproducing device according to a first embodiment of the present invention.

FIG. 2 is a flowchart for explaining a digest screen display operation of the optical disc reproducing apparatus of FIG. 1;

FIG. 3 is a view showing a digest screen displayed by the optical disc reproducing apparatus of FIG. 1;

FIG. 4 is a flowchart for explaining a digest screen display operation of the optical disc reproducing apparatus according to the second embodiment of the present invention.

FIG. 5 is a flowchart for explaining a digest screen display operation of the conventional optical disc reproducing apparatus.

FIG. 6 is a diagram showing an example of a moving image that gradually becomes brighter from a dark screen.

FIG. 7 is a diagram showing a digest screen displayed by a conventional optical disc reproducing device.

[Explanation of symbols]

1 ... optical disk, 2 ... optical disk drive, 3 ... MPE
G decoder, 4 image memory, 5 display device,
6 display controller, 7 CPU, 8 RA
M, 9: input device, 10: digest screen, 11-1
11-9: Reduced image.

Claims (4)

[Claims] 1. An optical disk reproducing method for reading an I picture from an optical disk on which audio / moving image data is recorded, displaying a reduced image of the I picture, and displaying a digest screen of a moving image recorded on the optical disk. 1. An optical disk reproducing method, comprising reading and displaying an I picture a predetermined time after the beginning of power video data. 2. The optical disk reproducing method according to claim 1, wherein a search for audio data is started from the beginning of the moving image data to be displayed, and an I picture at a predetermined time after the detection of the audio data is read and displayed. An optical disc reproducing method characterized by the above-mentioned. 3. An optical disk reproducing apparatus for reading an I picture from an optical disk on which audio / moving image data is recorded, displaying a reduced image of the I picture, and displaying a digest screen of a moving image recorded on the optical disk. Reading means for reading data, display means for displaying a digest screen, calculating an address after a predetermined time from the beginning of moving image data to be displayed, and reproducing the data after this address by the reading means for detection. An optical disk reproducing apparatus comprising: a control unit for reducing an I picture and displaying the reduced I picture on a display unit. 4. The optical disc reproducing apparatus according to claim 3, wherein the control means causes the reading means to reproduce the data from the beginning of the moving image data to be displayed, starts searching for audio data, and detects the audio data. An optical disc reproducing apparatus which calculates an address after a predetermined time from a point in time, reproduces data subsequent to the address by a reading means, reduces the detected I picture, and displays the reduced I picture on a display means.