CN1154090C - Optical disk reproducing method and optical disk reproducing system - Google Patents

Abstract

The present invention provides a method of optical disk reproduction for display a extract screen of moving image data on the optical disk, wherein a head address of moving image data to be displayed is obtained by using audio data and moving image data recorded on the optical disk, an address after a prescribed time from a time indicated by the head address is calculated and moving image data are read according to the address calculated, then an I picture is detected in the read moving image data and a first detected I picture is displayed in a contracted size.

Description

Optical disc playback method and optical disc playback system

technical field

The present invention relates to an optical disc reproducing method and an optical disc reproducing system for reproducing an optical disc on which voice data and moving image data encoded in the MPEG standard are recorded, and in particular to a summary capable of displaying a moving image recorded on the optical disc Disclosed are an optical disc playback method and an optical disc playback system.

Background technique

Recently, much attention has been paid to the technique of how to record long-time moving image data on such as a video compact disc (Video CD). Since it is necessary to use data compression technology to reduce the amount of data so that it can record moving image data for a longer period of time, various moving image data compression techniques have been proposed, and the MPEG method is used in video CDs.

Here, if it is possible to sequentially read out recorded moving images and reduce their size to display them in the form of an array list of reduced images (summary screen), it is possible to effectively recognize the difference of moving images recorded on an optical disc. content.

FIG. 5 is a flow chart for explaining the operation of displaying a summary screen using a conventional optical disc playback system. First, the system reads a data table recorded at a given position on the optical disc to store addresses (minutes, seconds, frames) of all moving image data recorded on the optical disc (step 501). Then, extract the head address (step 502) of the moving image data to be displayed, and move the optical head to the position of the head address to read data from the optical disc (step 503), and provide the read data to MPEG decoder (step 504).

If an I picture (intra-coded picture) in the MPEG format is detected in the data following the header address, image data to be obtained by an MPEG decoder decoding the detected I picture is first reduced and then displayed on on the display (step 505). This operation will be repeated (step 506) as long as there is still moving image data on the disc.

In the display method described above, what is displayed is a reduced image of the I picture detected first among the data following the head address. Therefore, when there are a plurality of groups of moving images respectively changing from black to brighter as shown in FIG. 7 is filled with multiple reduced images 51 similar to summary screen 50 . In this case, it cannot be judged what the content of the moving picture recorded on the optical disk is.

In addition, there is another method that, after detecting the brightness of each image, when the brightness of the input image is equal to or greater than a predetermined brightness, a reduced image of the same image as the original I picture will be displayed. A problem with this method, however, is that when each set of moving images starts with a bright (saturated) image, conversely the fluorescent screen is filled with many bright reduced images.

Contents of the invention

An object of the present invention is to provide a system capable of showing that its content can be recognized by skipping blurred parts even in the case where a moving image starts with a black or white monochrome image so that its content cannot be easily recognized Disclosed are optical disc playback method and optical disc playback system for effective images.

According to the first aspect of the present invention, a summary screen for reading out intra-coded pictures from an optical disc on which voice data and moving picture data are recorded and displaying a moving picture recorded on the optical disc in a reduced image array of these intra-coded pictures The method for replaying an optical disc comprises the following steps:

Calculating the address after the preset default value or the predetermined time set by the user using the input device from the head address of the moving image data to be displayed recorded on the optical disc;

Read out the internal coding picture according to the calculated address;

Detecting the intra-coded picture in the data after the address has been calculated, decoding the detected intra-coded picture to obtain moving image data, and shrinking it;

writing the reduced moving image frame into the memory; and

Converts the reduced image stored in the memory into an analog image signal and supplies it to the display.

In this preferred embodiment, the disc playback method further includes the following steps:

acquiring the address of the moving image data recorded on the optical disc;

A head address of moving image data to be displayed is obtained from the obtained address; and an address after a predetermined time elapses from the head address is calculated.

In another preferred embodiment, the CD playback method further includes the following steps:

reading moving image data from the calculated address position;

detecting an intra-coded picture from the read-out moving image data; and reducing the image size of the first detected intra-coded picture.

According to a second aspect of the present invention, a summary screen for reading out intra-coded pictures from an optical disc on which voice data and moving picture data are recorded and displaying a moving picture recorded on the optical disc in a reduced image array of these intra-coded pictures The method for replaying an optical disc comprises the following steps:

Reading out the moving image data from the head address of the moving image data to be displayed recorded on the optical disc;

retrieving voice data from the read moving image data;

Calculate the address after the preset default value or the predetermined time set by the user using the input device from the voice data detection point;

Detecting the intra-coded picture in the data after the address has been calculated, decoding the detected intra-coded picture to obtain moving image data, and shrinking it;

writing the reduced moving image frame into the memory; and

Converts the reduced image stored in the memory into an analog image signal and supplies it to the display.

In this preferred embodiment, the disc playback method additionally includes the following steps:

acquiring the address of the moving image data recorded on the optical disc;

The address of the head of the moving picture data to be displayed is derived from the obtained address; and the address after a predetermined time elapses from the voice data detection point is calculated.

In another preferred embodiment, the CD playback method additionally includes the following steps:

An intra-coded picture is detected from the read moving picture data, and the image size of the first detected intra-coded picture is reduced.

According to a third aspect of the present invention, a summary screen for reading out intra-coded pictures from an optical disc on which voice data and moving picture data are recorded and displaying a moving picture recorded on the optical disc in a reduced image array of these intra-coded pictures Surface CD playback systems include:

means for reading moving picture data from an optical disc;

means for calculating the address after a preset default value or a predetermined time set by the user using an input device from the head address of the moving image data to be displayed;

means for detecting said intra-coded picture in the data after the address has been calculated;

A device that decodes the detected intra-coded picture to obtain moving image data, and performs reduction processing on it; and

A device that writes the reduced moving picture frame into a memory and converts the reduced image stored in the memory into an analog image signal and supplies it to a display.

In a preferred embodiment, the disc playback system additionally includes:

means for acquiring the address of moving picture data recorded on an optical disc and deriving from the obtained address the head address of the moving picture data to be displayed, wherein

An address after a predetermined time elapses from the head address is calculated by the address calculation means.

According to a fourth aspect of the present invention, a summary screen for reading out intra-coded pictures from an optical disc on which voice data and moving picture data are recorded and displaying a moving picture recorded on the optical disc in a reduced image array of these intra-coded pictures Surface CD playback systems include:

means for reading out moving image data from the head address of the moving image data to be displayed recorded on the optical disc;

means for retrieving speech data from the read motion picture data;

A device for calculating the address after the preset default value or the predetermined time set by the user using the input device from the voice data detection point;

means for detecting said intra-coded picture in the data after the address has been calculated;

A device for decoding the detected intra-coded picture to obtain moving image data, and reducing it;

A device that writes the reduced moving picture frame into a memory and converts the reduced image stored in the memory into an analog image signal and supplies it to a display.

In a preferred embodiment, the disc playback system additionally includes:

means for obtaining the address of the moving picture data recorded on the optical disc and deriving from the obtained address the head address of the moving picture data to be displayed, and

Means for reducing the image size of the first detected intra-coded picture.

Other objects, characteristics and advantages of the present invention will become apparent from the detailed description given next.

Description of drawings

Through the detailed description given below and the accompanying drawings of preferred embodiments of the present invention, the present invention will have a more complete understanding, but wherein these embodiments should not be regarded as limiting the present invention, its purpose is only In order to facilitate description and understanding of the present invention.

In the attached picture:

Fig. 1 shows the block diagram of the disc playback system of the first embodiment of the present invention;

FIG. 2 is a flow chart for explaining the operation for displaying a summary screen in the optical disc playback system shown in FIG. 1;

FIG. 3 is a schematic diagram of a summary screen displayed by the optical disc playback system shown in FIG. 1;

FIG. 4 is a flow chart for explaining the operation for displaying a summary screen in the optical disc playback system of the second embodiment of the present invention;

FIG. 5 is a flow chart for explaining the operation for displaying a summary screen in a conventional optical disc playback system;

FIG. 6 is a schematic diagram of an example of moving image data that becomes brighter from black;

FIG. 7 is a schematic diagram of a summary screen displayed by a conventional optical disc playback system.

Detailed ways

Next, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the ensuing description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known structures have not been shown in detail in order not to obscure the present invention. FIG. 1 is a block diagram showing an optical disk playback system according to a first embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation of displaying a summary screen in the optical disk playback system.

The optical disk playback system of the present embodiment includes an optical disk drive 20 as a kind of reading device for reading data from an optical disk 10 such as a video CD or the like; The MPEG decoder 30 that data is decoded; Its capacity can store at least the image memory 40 of a frame image data decoded by MPEG decoder 30; For the image data that is stored in the image memory 40 is displayed on the display on the display 50 A controller 60; a CPU 70 as a control means for controlling the operation of the entire system, a RAM 80 for storing addresses of moving image data or the like; and an input device 90 through which a user can give instructions from the outside.

Next, the operation for displaying the summary screen in this optical disc playback system will be described using the flow chart shown in FIG.

First, when the optical disc 10 was placed on the optical disc drive 20, the optical disc drive 20 will read a data table recorded on the optical disc 10 under the control of the CPU 70. In this table, addresses (minutes, seconds, frames) of the entire moving image data recorded on the optical disc 10 encoded in the MPEG standard are registered. The CPU 70 stores these addresses of the moving image data obtained from the optical disc 10 into the RAM 80 (step 201).

Subsequently, the CPU 70 fetches the head address of the moving image data to be displayed from the RAM 80 (step 202), and calculates an address after a predetermined time elapses from the head address (step 203).

As for the predetermined time, its default value can be determined in advance in the control program of the CPU 70. Alternatively, the user may use the input device 90 to set it to any time other than the predetermined time.

CPU 70 moves the optical head of optical disc driver 20 on optical disc 10 to the address obtained by calculation to read data from optical disc 10 (step 204), and provide the data read out to MPEG decoder 30 (step 204). 205).

The MPEG decoder 30 decodes the supplied MPEG encoded data. If an I picture (intra-coded picture) of an MPEG image is detected in the data after the calculated address (step 206), the CPU 70 will reduce the number obtained by the MPEG decoder 30 that decodes the first detected I picture. The size of the image data is generated (step 207) and the data whose size is reduced is written into a certain predetermined storage area in the image memory 40. The display controller 60 converts the image data stored in the image memory 40 into an analog image signal and supplies it to the display 50 . Thus, the reduced image 11-1 shown in FIG. 3(a) is displayed on the summary screen 300 of the display 50 (step 208).

CPU 70 judges whether moving image data still exists on the optical disk 10 according to the address stored in RAM 80 (step 209), and when moving image data still exists, this step returns to step 202, repeats the same operation thus.

After the first I-picture is written to an area different from that of the reduced-size image 11-1, the reduced-size image 11-2 formed by the next I-picture is written into the image memory 40, which is identical to the first I-picture. The image 11-1 formed by an I picture is adjacent to each other, as shown in FIG. 3(b).

Repeatedly performing the above operations will display reduced image arrays 11-1 to 11-9 as shown in FIG. 3(c).

In the above-mentioned conventional method, because what read out and display as shown in Figure 6 is the I picture 610 on the head address (t1), if there are a plurality of moving picture groups as shown in Figure 6, the fluorescent screen will be like a picture. The summary screen 300 shown in FIG. 7 is also filled with black reduced images 310 .

On the contrary, in the present embodiment, what is read and displayed is the I picture 320 on the address (t2) after a predetermined time has elapsed from the head address (t1), so that it can be displayed that the image on the optical disc 10 can be easily identified. An active summary screen of the contents of the recorded moving picture data.

Next, an optical disk reproducing system according to a second embodiment of the present invention will be described. The structure of the optical disk reproducing system of the second embodiment is the same as that of the first embodiment shown in FIG. 1; therefore, the description about its structure will be omitted.

FIG. 4 is a flowchart for explaining the operation of the optical disc playback system according to the second embodiment of the present invention for displaying a summary screen.

The operations of steps 401 and 402 are the same as the operations of steps 201 and 202 in FIG. 2 for explaining the operation of the first embodiment.

In the present embodiment, according to the control of the CPU 70, the optical head of the optical disc drive 20 is moved to the head address of the moving image data to be displayed to read data from the optical disc 10 (step 403), and the read data is Provided to MPEG decoder 30 (step 404).

When detecting the voice data encoded with the MPEG standard from the data after the head address (step 405), the CPU 70 will calculate a predetermined time (for example, 2 seconds) from the time indicated by the address of the voice data After the address (step 111). In step 110, data is continuously read from the position of the head address until no more speech data encoded in the MPEG standard is detected. The predetermined time may be determined in advance, or may be set to an arbitrary time by the user.

CPU 70 moves the optical head of optical disk driver 20 on optical disk 10 to the address obtained by the above calculation to read data from optical disk 10 (step 407) and provide the data read out to MPEG decoder 30 (step 408 ).

The MPEG decoder 30 decodes the supplied MPEG coded data. When an I picture (intra-coded picture) of an MPEG image is detected from the data after the calculated address (step 409), the CPU will reduce the number of MPEG decoders 30 that decode the first detected I picture. The obtained size of the generated image data is obtained, and the image data whose size is reduced is written into the image memory 40 .

The display controller 60 converts the image data stored in the image memory 40 into an analog image signal and supplies it to the display 50 . Thus, the reduced image is displayed on the display 50 (step 411).

CPU 70 judges whether moving image data (step 412) still exists on the optical disc 10 according to the address stored in RAM 80, and when still existing moving image data, this step returns to step 402, repeats identical operation thus.

In the above manner, the summary screen 30 displayed on the display 50 will be the same as that of the first embodiment.

The second embodiment described above is designed to start with retrieving voice data from the start point of moving image data to be displayed, and to display that a predetermined time (for example, 2 seconds) has elapsed from the time indicated by the address of the detected voice data. after the address on the I picture. This is because, in the first embodiment, it may be difficult to properly determine the predetermined time elapsed from the time of the head address in some cases. The detection of voice data is because it is considered that generally there will be a moving image whose content can be easily recognized when the voice data appears, instead of a monochrome image.

In the second embodiment, the predetermined time is set to 2 seconds. This is because the array interval of an I picture can be defined as a maximum of 2 seconds in the MPEG method. It is not necessary to reiterate that the predetermined time may be set to any time other than 2 seconds.

In the above embodiment, FIG. 3 exemplifies the summary screen 300 including nine reduced images 11-1 to 11-9; however, the number of reduced images is not limited thereto, and may be any number.

When the 10th reduced image exceeding the number of images displayed on the summary screen 300 is obtained from the optical disc 10, the CPU 70 can delete all the reduced images and start a new display, or keep the reduced images being displayed. One and place the new reduced image next to it.

The optical disc playback method according to these embodiments can be realized by loading a computer program (control program) for executing the processing shown in FIG. 2 or FIG. The computer program (control program) is stored in a storage medium 100 such as a magnetic disk, semiconductor memory, or the like. The computer program is loaded into the CPU 70 from the storage medium 110 and the CPU 70 controls each component according to the control program, thereby realizing the above-mentioned processing functions.

According to the present invention, what is read and displayed is an I picture after a predetermined time elapses from the start of moving image data to be displayed. Therefore, even if the moving image data is moving image data beginning with a monochromatic image such as black or white whose contents are not easily recognized, effective images whose contents can be recognized very arbitrarily can be displayed by skipping the blurred portion. image. As a result, moving image data recorded on the optical disc can be easily and surely recognized.

Although the present invention has been illustrated and described above according to its embodiments, it should be understood by those skilled in the art that the above and other various changes can be made therein and to it without departing from the spirit of the present invention. omit and add. The invention is therefore not to be understood as being limited to the particular embodiments described above, but to include all possible embodiments which can be practiced within the scope covered by the characteristics set forth in the appended claims.

Claims (10)

1. A method for reproducing an optical disc, which is used to read out an internally coded picture from an optical disc on which voice data and moving image data are recorded, and to display the image of the moving picture recorded on the optical disc with a reduced image array of these internally coded pictures A summary screen, characterized in that it comprises the steps of: calculating an address after a preset default value or a predetermined time set by the user using an input device from the head address of the moving image data to be displayed recorded on the optical disc; Read out the internal coding picture according to the calculated address; Detecting the intra-coded picture in the data after the address has been calculated, decoding the detected intra-coded picture to obtain moving image data, and shrinking it; writing the reduced moving image frame into the memory; and Converts the reduced image stored in the memory into an analog image signal and supplies it to the display. 2. The disc playback method according to claim 1, further comprising the steps of: acquiring an address of moving image data recorded on the optical disc; deriving a header address of the moving image data to be displayed from the obtained address; and An address after elapse of the predetermined time from the head address is calculated. 3. The disc playback method according to claim 1, further comprising the steps of: reading moving image data from the optical disc according to the calculated address; detecting an intracoded picture from the read motion picture data; and Reduce the image size of the first detected intra-coded picture. 4. A method for reproducing an optical disc for reading out internally encoded pictures from an optical disc on which voice data and moving image data are recorded, and displaying images of the moving images recorded on the optical disc with reduced image arrays of these internally encoded pictures A summary screen, characterized in that it comprises the steps of: read out the moving image data from the head address of the moving image data to be displayed recorded on the optical disc; retrieving voice data from the read moving image data; Calculate the address after the preset default value or the predetermined time set by the user using the input device from the voice data detection point; Detecting the intra-coded picture in the data after the address has been calculated, decoding the detected intra-coded picture to obtain moving image data, and shrinking it; writing the reduced moving image frame into the memory; and Converts the reduced image stored in the memory into an analog image signal and supplies it to the display. 5. The optical disc playback method as claimed in claim 4, further comprising the steps of: acquiring an address of moving image data recorded on the optical disc; deriving a header address of the moving image data to be displayed from the obtained address; and An address after the predetermined time elapses from the voice data detection point is calculated. 6. The disc playback method as claimed in claim 4, further comprising the steps of: detecting an intracoded picture from the read motion picture data; and Reduce the image size of the first detected intra-coded picture. 7. An optical disc playback system for reading out internally coded pictures from an optical disc on which voice data and moving picture data are recorded, and displaying images of moving pictures recorded on the optical disc with reduced image arrays of these internally coded pictures A summary screen, characterized by including: means for reading motion picture data from said optical disc; means for calculating the address after a preset default value or a predetermined time set by the user using an input device from the head address of the moving image data to be displayed; means for detecting said intra-coded picture in the data after the address has been calculated; A device that decodes the detected intra-coded picture to obtain moving image data, and performs reduction processing on it; and A device that writes the reduced moving picture frame into a memory and converts the reduced image stored in the memory into an analog image signal and supplies it to a display. 8. The CD playback system as claimed in claim 7, further comprising: means for acquiring an address of moving picture data recorded on said optical disc and deriving from said obtained address a head address of moving picture data to be displayed, Wherein said address calculating means calculates the address after said predetermined time elapses from the head address. 9. An optical disc playback system for reading out internally coded pictures from an optical disc on which voice data and moving picture data are recorded, and displaying images of moving pictures recorded on the optical disc with reduced image arrays of these internally coded pictures A summary screen, characterized by including: means for reading out moving picture data from a head address of moving picture data to be displayed recorded on said optical disc; means for retrieving speech data from the read motion picture data; A device for calculating the address after the preset default value or the predetermined time set by the user using the input device from the voice data detection point; means for detecting said intra-coded picture in the data after the address has been calculated; A device that decodes the detected intra-coded picture to obtain moving image data, and performs reduction processing on it; and A device that writes the reduced moving picture frame into a memory and converts the reduced image stored in the memory into an analog image signal and supplies it to a display. 10. The optical disc playback system as claimed in claim 9, further comprising: means for obtaining an address of the moving picture data recorded on said optical disc and deriving from said obtained address a head address of the moving picture data to be displayed; and Means for reducing the size of the image of the first detected intra-coded picture.

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