JPH0757434A - Optical disk recording and reproducing device, optical disk reproducing device and optical disk - Google Patents

Abstract

PURPOSE:To freely set the fineness of scanning a picture at the time of reproducing the picture scanning by automatically producing retrieval information and registering it at the time of recording the picture. CONSTITUTION:A timewise change of an inputted picture is detected by a picture changing degree detecting part 108, and retrieval information is generated by a retrieval information generating part 113 in making an obtained picture changing degree correspond to position information of recording the inputted picture, and this retrieval information is recorded in a specified area on an optical disk 101. At the time of reproducing, the recorded retrieval information is reproduced, and picture data are selectively reproduced by using the picture changing degree in this retrieval information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc recording / reproducing apparatus for compressing and encoding a video signal and recording / reproducing it on an optical disc, and an optical disc reproducing / reproducing device for compressing and encoding a video signal recorded on a disc. It relates to the device.

[0002]

2. Description of the Related Art With the development of digital storage media and the advancement of image compression technology, it has become possible to compress and record long-time moving images on these recording media. As the amount of images that can be recorded increases, there is an increasing demand for efficiently grasping the recorded contents in a short time.

A conventional cueing method for a disc will be briefly described by taking a CD (compact disc) as an example. In a CD, TOC (TABLE OF CONTENTS) table of contents information is recorded in advance in the lead-in area. First of all, this TOC
The approximate position is obtained based on the following, and then the final position is obtained using the track number, time code, etc. in the subcode information recorded together with the program information in the program area.

Further, in order to easily select a song to be reproduced from a CD in which a plurality of songs are recorded, usually, a "music scan" is performed in which the beginning portion of the song is reproduced for a fixed time. The method is taken. further,
Various efforts have been made to make it easier to select the song you want to listen to.For example, while playing a part of a song in the music scan mode, the playing time elapsed display shows the song currently playing. A method of displaying the playing time is described in JP-A-63-167494.

[0005]

However, in the above-described conventional configuration, the cue can be performed only by the information such as the position registered in advance and the time code. Therefore, at the time of recording, it is necessary to determine the position to be searched for and then write the data to the disc. In the case of a read-only disc, this work can be done by a disc maker or the like, so this is not a big problem, but in the case of a write-once type optical disc or a rewritable type optical disc, it must be done by the user, which is complicated. Therefore, it is extremely difficult to carry out.

Even in the case of a read-only disc, the number of search positions registered by the disc manufacturer or the like is likely to be too large or too small for each user, and the user desires. There is a problem that image scanning cannot be performed.

In view of the above, the present invention provides an optical disc recording / reproducing apparatus capable of automatically creating and registering search information at the time of image recording and freely setting the fineness of image scanning at the time of image scanning reproduction. The purpose is to do.

[0008]

An optical disk recording / reproducing apparatus according to the present invention includes an image input unit for inputting an image to be recorded and an image change degree for detecting a temporal change of an input image input by the image input unit. Detection means, search information generation means for generating search information in which the image change degree obtained by the image change degree detection means is associated with the position information where the input image is recorded, and the search information is stored in a predetermined area on the optical disc. The configuration is provided with a search information recording means for recording, a search information reproducing means for reproducing the recorded search information, and an image data reproducing means for selectively reproducing image data by using the information.

Further, the optical disc reproducing apparatus of the present invention reproduces search information reproducing image reproduction degree information indicating temporal change degree of recorded image data and position information of recorded image data corresponding thereto. And image data reproducing means for selectively reproducing the corresponding image data using the image change degree information and the position information.

[0010]

According to the present invention, with the above-described structure, the temporal change of the input image inputted is detected as the image change degree, and the search information associated with the position information of the recorded input image is created to obtain a predetermined information on the optical disc. Record in the area.

At the time of reproduction, the search information is reproduced from a predetermined place on the optical disk, and the image data is selectively reproduced according to the image change degree.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an optical disk recording / reproducing apparatus according to an embodiment of the present invention.
The optical disc recording / reproducing apparatus of the present embodiment is capable of recording / reproducing not only an image signal but also an audio signal, a data signal, etc., but in FIG. 1, only the portion related to the image signal is shown.

The operation will be described below with reference to FIG. First, the optical disc 101 is a spindle motor 102.
The pickup 103 is driven to rotate by the feed motor 104. The servo circuit 105 determines the rotation speed of the spindle motor 102 and the feed motor 104.
Of the laser light emitted from the semiconductor laser (not shown) in the pickup 103 is controlled and the tracking control is performed.

Here, the operation during recording will be described.
The input image 106 to be recorded on the optical disc 101 is first input to the image encoder 107 and the image change degree detection unit 108. The image encoder 107 compresses the band and sends it to the data forming unit 109.

The image change degree detection unit 108 detects the degree of change over time of the input image. There are various methods for detecting the degree of image change. For example, a correlation value between an input frame and a frame immediately preceding in time is obtained, and the smaller this value is, the larger the image change degree is. There is a way. FIG. 2 shows an example of the configuration of the image change degree detection unit 108 according to this method.

Here, the operation of the image change degree detecting section will be briefly described with reference to FIG. The input image 201 is input to the delay processing unit 202 and the correlation calculation unit 203. Delay processing unit 2
In 02, the input signal is delayed by one frame and output.
In the correlation calculation unit 203, the correlation value between the input signal 201 and the image signal one frame before from the delay processing unit 202 is calculated as the square of the difference value of the luminance component of each corresponding pixel on the screen and the difference value of the color component. Is calculated as the sum of the squares of
Output to 04.

In the classification processing unit 204, the correlation calculation unit 203
By using the calculation result of, the image is divided into levels of 0 to 255, which are inversely proportional to the correlation value, and output as the image change degree 205. That is, the one having a large correlation value by the correlation calculation unit 203 is set as the image variation degree = 0, and the one having a small correlation value is set as the image variation degree = 255. An example of these signals is shown in FIG.
Shown in.

FIG. 3A shows an example of the output signal of the correlation calculation unit 203, and FIG. 3B shows the output of the classification processing unit 204 when the signal of FIG. 3A is input. It is an example of a signal.

When the image change degree detected by the image change degree detecting section 108 is larger than a predetermined value, the search information generating section 113 calculates the address where the image is recorded,
The image change degree and its address are stored in the search information memory 114. In addition, at the start of recording, the search information generation unit 113 weights the result of the image change degree detection unit 108 by adding 100, for example, in response to a command from the system controller 115.
The processing is performed in the same manner as in the normal case.

The TOC generator 110 generates TOC information as the table-of-contents information and stores it in the TOC memory 111 during or after the writing of the program information (for example, input image information).

The sub-code generator 112 provides sub-code information such as an identification signal indicating a video signal based on a command from the system controller 115, a track number when recording program information, an index number, a program time and an absolute time. It is generated and output to the data forming unit 109.

The data forming section 109 interleaves the input data, and at the same time, the subcode generating section 112.
The sub code and the error check code generated by are added, and the data is modulated and output. In addition, after recording the program information,
The TOC information read from the C memory 111 and the search information read from the search information memory 114 are formed into a predetermined format and output. Data forming unit 109
Output data is sent to the pickup 103 and recorded on the optical disc 101.

FIG. 4A shows an example of the arrangement of recorded data on the optical disc. The TOC information 402 is recorded on the innermost circumference of the optical disc 401, and the search information 403 is recorded on the outer side thereof. Then, as shown in FIG. 4B, the search information 403 is recorded as a combination of the image change degree 404 and its address 405.

During normal reproduction, the pickup 1
The signal reproduced in 03 is input to the signal reproduction processing unit 116, and in the signal reproduction processing unit 116, after performing demodulation processing, subheader detection, error correction processing, etc., if TOC information or search information If the image signal is written in the memory 111 and the search information memory 114, the image signal is supplied to the image decoder 117, and the program signal other than the image signal (sound signal etc.) is output to the corresponding program signal processing unit (not shown). .

The image decoder 117 decodes and expands the compression-encoded image and outputs the reproduced image 118.

Next, the operation in the image scan mode will be described. The user selects an image scanning range and an image scanning level, and enters an image scanning mode by commanding execution of the image scanning.

In the image scan mode, the system controller 115 first searches the search information memory 114.
Is checked, and if the search information in the range for image scanning is not read, the optical disc 101
The search information is read from the area in which the search information is recorded and the search information is written in the search information memory 114.

When the search information of the range to be image-scanned is read into the search information memory 114, the system controller 115 reads the search information (image change degree and address) at the beginning of the image scan range from the search information memory 114. If the image change degree is equal to or higher than the set scan level, the servo circuit 105 is instructed to start reproduction from the image data of the address corresponding to the scan level, and the image data for the number of frames corresponding to the image change degree is displayed. Control to perform playback. The number of frames to be reproduced is, for example, 1 frame if the image change degree = 0 to 15, 2 frames if the image change degree = 16 to 31, ..., Image change degree = 24.
If 0 to 255, 16 frames are set.

Next, the second search information from the beginning of the image scan range is read from the search information memory 114, and if the image change degree is equal to or higher than the set scan level, the image data of the address corresponding to that is reproduced. The image data for the number of frames corresponding to the degree of image change is reproduced. In the same manner, this operation is repeated until the end of the scan range.

The scan level can be freely set by the user. For example, if the user wants to grasp the contents in a short time, the scan level can be set large so that only the portion where the image changes drastically can be intensively scanned. Further, by setting the scan level to be small, the content can be grasped in more detail.

In this embodiment, the image encoder and the image change degree detection unit are separate units. However, when the image encoder performs image compression processing utilizing the correlation between frames, for example, the image encoder The image change degree may be detected using a signal inside the.

As described above, according to the present embodiment, search information is automatically created at the time of recording an image, and at the time of reproduction, an image scan for extracting a portion having a large image change degree and reproducing it is performed. In addition, the user can freely set the image scanning level.

[0033]

As described above, according to the present invention,
Retrieval information can be automatically created and registered at the time of image recording, and the fineness of image scanning can be freely set at the time of image scanning reproduction, which has a large practical effect.

[Brief description of drawings]

FIG. 1 is a block diagram of an optical disc recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of an image change degree detection unit in FIG.

FIG. 3 is a characteristic diagram for explaining signals of respective parts in FIG.

FIG. 4 is a format diagram showing a format on an optical disc according to an embodiment of the present invention.

[Explanation of symbols]

 101 optical disk 105 servo circuit 106 input image 107 image encoder 108 image change degree detection unit 109 data formation unit 110 TOC generation unit 111 TOC memory 112 subcode generation unit 113 search information generation unit 114 search information memory 115 system controller 116 signal reproduction processing unit 117 Image Decoder 118 Reproduced Image 401 Optical Disc 402 TOC Information 403 Search Information 404 Image Degree of Change 405 Address

Claims (7)

[Claims] 1. An image input means for inputting an image to be recorded, an image change degree detection means for detecting a temporal change of an input image input by the image input means, and an image change degree detection means. Search information generating means for generating search information in which the obtained image change degree is associated with position information of the input image recorded; search information recording means for recording the search information in a predetermined area on the optical disc; An optical disk recording / reproducing apparatus comprising: a search information reproducing device for reproducing the retrieved search information; and an image data reproducing device for selectively reproducing image data using the search information. 2. The image data reproducing means is controlled so as to selectively reproduce only the image data of a portion where the degree of temporal change of the image data is larger than a predetermined value. Optical disk recording and reproducing device. 3. The optical disk recording / reproducing apparatus according to claim 1, wherein the image data reproducing means is controlled so as to reproduce the image data only for a time corresponding to a temporal change degree of the image data. 4. Retrieval information reproducing means for reproducing image change degree information indicating a degree of change in time of recorded image data and position information in which image data corresponding to the image change degree information is recorded. An optical disc reproducing apparatus comprising image data reproducing means for selectively reproducing the corresponding image data using the image change degree information and the position information. 5. The optical disk reproducing apparatus according to claim 4, wherein the image data reproducing means is controlled so as to selectively reproduce only the image data of a portion where the image change degree information is larger than a predetermined value. . 6. The optical disk reproducing apparatus according to claim 4, wherein the image data reproducing means is controlled so as to reproduce the image data only for a time period according to the image change degree information. 7. Image data is recorded, and information indicating a degree of temporal change of the image data and position information of recorded image data corresponding to the degree of change information are recorded at a predetermined location. An optical disc characterized in that