JPH0620446A - Information retrieval device for cd-rom - Google Patents

Abstract

PURPOSE:To simplify the information retrieval of a CD-ROM by recording picture data and character information in one file and recording information, which indicates this recording position on a disk, in a table file. CONSTITUTION:An information retrieval device sends data from a CD-ROM drive 1 to a buffer 3. At this time, the number of read-in bytes is counted by a counter 2, and first 2048 bytes of the character and picture file are sent to a personal computer 9 through a buffer 5, and the residual bytes are sent to a graphic controller 10 and a frame memory 11 through a buffer 7 and are displayed on a picture display device 12. Consequently, character information and picture data are acquired from the table file by one seek because character information and picture data are stored in one file, and the retrieval time is shortened in comparison with conventional retrieval of two seeks.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for retrieving character information recorded on a CD-ROM disc and image data.

[0002]

2. Description of the Related Art As shown in FIG. 3, data recorded on a CD-ROM disc includes a keyword, a pointer to a table file, an index file consisting of the number of records in the table file indicating the keyword, and a master. The table file includes a pointer to the file and information indicating the position of the image file, a master file including character information, and N image files.

As an access method, after inputting a character to be searched, it is compared with a keyword of an index file,
Acquire the number of records at the corresponding location and the pointer to the table file, access the table file through the pointer, obtain the pointer to the master file and the position information of the image file in the table file, and access the master file. To read the text and read the data from the corresponding image file.

For example, when character information and image data when the keyword is 2 are desired, it is searched for "2" in the keyword field in the index file. Since “2” exists when searching, the number “1” at that time and the pointer “1” to the table file are obtained. The pointer "1" to the table file means the first record of the table file, and the number indicates the number of records starting from the record.

Based on the value obtained here, the table file is accessed to obtain a pointer "1" to the master file and a value "2" indicating the image file position. The pointer to the master file is "1", which means the first record in the master file, and the image file position is "2".
Means the second file. Character information can be obtained by reading the first record of the master file, and image data can be obtained by reading the second image file.

[0006]

In the conventional data structure, the master file and the image file are physically separated from each other on the CD-ROM disk, and after the table file is accessed, the master file is accessed, and the image file is further saved. Since it is accessed, it takes a long time to read the data corresponding to the moving distance.

[0007]

According to the present invention, instead of a master file and N image files, character information in one image is stored in a fixed length of a predetermined word length (for example, 2048 bytes), and then the image data of the image data is stored. A subsequent file is created, and there are N files, and one file of character information and image data is called a character image file, and the data in the table file consists of information indicating the position of the character image file. By recording the information indicating the position of this character image file in the table file, it was necessary to seek twice to access the master file and the image file until now. It gets shorter.

[0008]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the information retrieval apparatus of the present invention, and FIG. 2 is a diagram showing recorded data. The data recorded on the CD-ROM disc as shown in FIG.
An index file consisting of keywords and pointers to table files and the number of records in the table file indicating the keywords, a table file consisting of information indicating the position of the character image file, and character information and image data in one file. It consists of N character image files stored.

As an access method, after inputting a character to be searched, it is compared with the keyword of the index file to obtain the number of records at the corresponding position and the pointer to the table file. When accessing the table file via that pointer and searching by image number, for example, since the number of records in the table file is 1, the position of the character image file that should be obtained at the time of accessing the table file can be obtained one, Seek to the character image file indicated by the position information, and display the character information and image consisting of the first 2048 bytes.

At this time, in order to separately send the character information and the image data to the personal computer and the graphic controller, the information retrieving apparatus is constructed by the block diagram shown in FIG.
First, data is sent from the CD-ROM drive 1 to the buffer 3. At that time, the number of bytes read by the counter 2 is counted, and the first 2048 bytes of the character image file are sent to the personal computer 9 via the buffer 5, and the rest are sent to the graphic controller 10 and the frame memory 11 via the buffer 7 and displayed on the screen. It is displayed on the container 12. As a result of storing the character information and the image data in one file, only one seek is required to acquire the character information and the image data from the table file, thereby reducing the search time. Further, by making the character information portion 2048 bytes, the data can be easily used.

[0011]

According to the present invention, since the character information and the image data are obtained by one seek, the search time is shortened.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing data recorded on a CD-ROM disc according to the present invention.

FIG. 3 is a diagram showing data recorded on a conventional CD-ROM disc.

[Explanation of symbols]

 1 CD-ROM drive 2 Counter 3, 5, 7 Buffer 4, 6 Latch 8 Signal control 9 Personal computer 10 Graphic controller 11 Frame memory 12 Screen display

Claims (1)

[Claims] 1. When the index file and the table file recorded on a CD-ROM disc are used to search the character information in the master file and the image data corresponding to the character information, the character data corresponding to the image data are the same. A means for recording in the file and a means for recording the value indicating the position on the CD-ROM disc of the file in which the image data and the character data are recorded in the table file are provided to shorten the search time. A characteristic CD-ROM information retrieval device.