JPH0642304B2 - Method of recording data on optical disk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a method for recording data on an optical disc, and more particularly, data cannot be read due to dust, scratches, stains, chemical changes, etc. attached to the optical disc. The present invention relates to a data recording method capable of preventing such a situation.

(Prior Art) Conventionally, optical discs have been widely put into practical use as recording media for document files, computer code data files, and image signals and audio signals. This optical disc records various kinds of data by forming pits, bubbles, or a rough surface on the surface thereof. Compared with magnetic discs, magnetic tapes, etc., recording density, ease of handling, life, etc. The field of application is rapidly expanding because it is remarkably excellent.

(Problems to be Solved by the Invention) However, on the other hand, this optical disc has a problem that it is weak against dust, scratches, stains, chemical changes, and the like. That is, as is well known, the reading of data from this optical disk is performed by irradiating the disk with a light beam and detecting the presence or absence of the pits or the like from the change in the reflected light, but dust, dirt, etc. on the surface of the optical disk. Adhesion, scratches, or chemical changes that would cause the reading light beam to be absorbed or reflected there would not be equivalent to correct data reading.

Since it is impossible to completely prevent dust, scratches, stains, etc. on the surface of the optical disk, in many cases the error correction code (ECC: E
The error correcting code is recorded and the read error is corrected based on this error correction code at the time of reading the data.

However, such a read error correction method is not perfect, and even if this error correction method is executed in the past, a read error may occasionally occur.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method of recording data on an optical disc that can significantly reduce the occurrence rate of read errors due to dust, scratches, dirt, etc. on the disc surface. It is intended.

(Means for Solving Problems) According to the data recording method for an optical disc of the present invention, when recording data on an optical disc whose recording area is divided into sector units, the byte length of one unit of data is the byte of the sector. When the length is ½ or less, each piece of data is duplicated in the first half of the sector having the smaller sector number and the latter half of the sector having the larger sector number of the two sectors separated from each other by one or more sectors. It is characterized by being recorded in.

(Operation) Sectors adjacent to each other may simultaneously become defective sectors (sectors causing a read error) due to one dust or the like. However, in general, it is difficult for two sectors that are not adjacent to each other to become defective sectors at the same time due to one dust or the like. In particular, if two sectors for writing the same data are used, for example, sectors that are widely separated from each other in the disc circumferential direction on the optical disc, there is no possibility that the two sectors will simultaneously become defective sectors due to one dust or the like. it is conceivable that. Under such a premise, the probability that two sectors will be defective sectors will be independent. Therefore, if the probability that one sector is defective is a × 10 ^−α , then both sectors will be defective. The probability of becoming a defective sector is ^az × 10 ^{−2α, which} is extremely low.

Generally, only one data is recorded in one sector of an optical disk, and when the data is search data or the like, the byte length of one unit is ½ of the byte length of the sector.
Since it is often below (that is, there is a margin in the sector), if the double recording is performed using two sectors in such a case, the above-mentioned margin is effectively used for the double recording. As a result, no new sector is needed for double recording.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 2 shows an image filing apparatus 50 which records data on an optical disk by applying the method of the present invention. The image filing device 50 includes a system control device 51,
It is composed of an optical disk device 52 and a console 61 composed of a keyboard 61A and a display device 61B such as a CRT.
The image filing device 50 is connected to the image processing device 30, and the image output device 70 is connected to the image processing device 30 to configure a medical image storage / reproduction system.

A radiation image information recording / reading device 10 as an example of an image data supply source is connected to the image processing device 30.
This radiation image information recording / reading apparatus 10 is disclosed in, for example, Japanese Patent Laid-Open No. 61-61.
No. 29834, No. 61-94035, etc., in which the stimulable phosphor sheet 11 is circulated and conveyed along the circulation passage 12 and stopped at a position facing the imaging base 13. By irradiating the light sheet 11 with the radiation 15 emitted from the radiation source 14, a transmission radiation image of a subject (patient) 16 is accumulated and recorded on the sheet 11. In the image reading section, the stimulable phosphor sheet 11 on which the radiation image is recorded is two-dimensionally scanned by the laser beam 18 deflected by the optical deflector 19 emitted from the laser light source 17. From the location of the sheet 11 that has been irradiated with the laser light 18 as the excitation light in this way, stimulated emission light that carries the radiation image information is emitted, and this stimulated emission light is passed through the light collector 20 to a photomultiplier or the like. Is detected photoelectrically by the photodetector 21. The analog output of this photodetector 21 is amplified and A / D
It is converted and output from the radiation image information recording / reading apparatus 10 as digital image data S1 carrying a radiation image of the subject 16. Accumulable phosphor sheet after image reading
Next, 11 is sent to the erasing section 22, where it is irradiated with the erasing light, and the radiation image information can be recorded again.

An ID terminal 25 is connected to the radiation image information recording / reading device 10, and an ID card 26 of the patient 16 is connected here.
The information written in (hereinafter referred to as patient information), that is, the patient's name, sex, date of birth, etc., is read, and various conditions related to radiography (hereinafter referred to as imaging information), that is, the image number. , Shooting date,
Information such as an imaged region, an imaged size, and reading sensitivity is input. The patient information S2 and the imaging information S3 are the image data S
1 is transmitted to the image processing apparatus 30.

In the image processing device 30, for example, 20 or more gradation processes and 10 or more frequency processes can be performed on the digital image data S1. All of these image processing conditions are tabulated, and the optimum one is automatically selected according to the photographing conditions set in the above-mentioned ID terminal 25. The image data S1 ′ that has been subjected to image processing under the optimum conditions in the image processing device 30 is sent to the image output device 70.

The image output device 70 comprises, for example, an optical scanning recording device for two-dimensionally scanning a light beam modulated on the basis of the image data S1 'on a photosensitive film, and an automatic developing machine for developing the exposed film. By performing such processing, the image carried by the image data S1 ', that is, the transmitted radiation image of the patient 16 is recorded on the photosensitive film.

A hard copy 71 of the radiation image formed using the photosensitive film as described above. Used for diagnosis of patient 16. As the image output device 70, in addition to the device having the above configuration,
For example, a CRT display device or the like may be used.

Next, the recording and storage (filing) of the radiation image by the image filing device 50 will be described. The system control device 51 of the image filing device 50 is composed of a known computer system, and includes a CPU (central processing unit) 53, a memory 54, interfaces 55 and 56, a disk drive control device 57, a bus 58 for connecting the above respective units, and a magnetic field. It is composed of a disk drive 59 and a floppy disk 60. The above-mentioned keyboard 61A and display device 61B are the above CPs.
The interface 55 is connected to the U53, and the interface 55 is connected to the interface 31 of the image processing apparatus 30. On the other hand, the optical disc device 52 includes an interface 62 connected to the interface 56 of the system control device 51, an optical disc drive control device 63, and an optical disc drive 64.

The above-mentioned patient information S2 and radiographing information S3 are transferred from the image processing device 30 to the system control device 51, and these information are sequentially recorded on the magnetic disk 65 driven by the magnetic disk drive 59 to construct a database. The floppy disk 66 driven by the floppy disk drive 60 is used for drive control of the system. The patient information S2 and the imaging information S3 are also transferred to the optical disk device 52, and are recorded and stored in the optical disk 67 driven by the optical disk drive 64 together with the image data S1 similarly transferred from the image processing device 30. At this time, the image data S1 bypasses the image processing unit in the image processing apparatus 30 and is recorded on the optical disc 67 in a so-called raw data state without being subjected to image processing.

Recording of the image data S1, the patient information S2, and the imaging information S3 on the optical disc 67 will be described in detail with reference to FIG. FIG. 3 schematically shows the recording format of the optical disc 67. In the figure, one scale on the vertical axis indicates one track of the optical disc, and one scale on the horizontal axis indicates one sector. The image data S1 is an optical disc
Image data recording area set wide enough for 67
At 80, one image is recorded. As is well known, this data recording is performed with or without the formation of bits on the disk surface. Before and after one image data 81, a header 81A for recording patient information S2 and imaging information S3 corresponding to the image data 81, and data S4 indicating image processing conditions in the image processing apparatus 30 are recorded. Blocks 81B and 81C are provided. In this example, when one photosensitive film has an image quality similar to that of a conventional X-ray image, and two images having different image quality and further improved diagnostic performance are recorded side by side. Therefore, the data S4 indicating the image processing condition of the left image is recorded in the block 81B, while the data S4 indicating the image processing condition of the right image is recorded in the block 81C. This image processing condition is the condition of the image processing itself which the image data S1 has received by the image processing device 30 when the image data S1 is immediately sent to the image output device 70 for image output.

As described above, image data is recorded on the optical disc 67.
When 81 is recorded, the image directory corresponding to the image data 81 is displayed in the image directory area 82.
One 83 (83A, 83B, 83C ...) is recorded. The image directory 83 basically has a header 81 for each image data 81.
The head address of A, the sector length of the image data 81, and characteristic information about the image data 81 are recorded.

In the optical disc 67, in addition to the areas 80 and 82 described above, an area 84 for forming replacement directories 89A, 89B, 89C, etc. for replacing the recorded contents of the image directory 83 when the recorded contents are changed, and a new medical record When the contents are to be recorded, an area 85 etc. for forming a directory corresponding to the newly recorded data are set.
In the first track of the optical disc 67, a large number of directory entries are provided along with a block 86 for recording the serial number of each disc and the identification codes of the A side and B side, and a block 87 indicating that the optical disc is full. Blocks 88A, 88B, 88C ... Are provided. The first directory entry block 88A is the image directory 83A,
This shows that a group of 83B, 83C, ... Is formed, and the start address and sector length of the image directory group (which is a directory group formed in the area 82) are recorded. The second directory entry block 88B records the start address and sector length of the replacement directory group (89A, 89B, 89C ...), and the third and subsequent directory entry blocks 88C ... sequentially start address of each future directory group. And is provided for recording the sector length.

As described above, the image data S1 is recorded one by one on the optical disc 67, and the patient information S2, the imaging information S3, and the image processing data S4 are sequentially recorded in association with each image data S1. It is preferable that the image data S1 is compressed by a known image data compression technique and then recorded on the optical disc 67 because the number of images that can be stored on the optical disc 67 can be increased. On the optical disc 67, in addition to the patient information S2, the photographing information S3, and the image processing data S4, image data having a very large data amount is recorded.
If data compression technology is applied, for example, one optical disc
About 67 images can be recorded and stored in 67. On the other hand, the magnetic disk 65 has a lower recording capacity than the optical disk 67, but here, the patient information S2 and the imaging information S3 are included.
Since only the information is recorded, it is possible to store patient information S2 and imaging information S3 for about 1 million images, for example.

Here, the method of the present invention is applied to the recording of the image directories 83A, 83B, 83C ... And the recording of the header 81A and the blocks 81B and 81C. Recording of the image directories 83A, 83B, 83C ... Will be described in detail below with reference to FIG. These image directories 83 as described above
The head address of the header 81A of each image data 81, the sector length of the image data 81, and characteristic information about the image data 81 are recorded in A, 83B, 83C, etc., but these search data are totaled. However, it can be represented by a byte length of 1/2 or less of one sector. Therefore, as shown in FIG. 1, the search data Dn of the image data 81 corresponding to the directory 83n is recorded in the first half of the nth image directory 83n, and at the same time, the search data Dn from the nth image directory 83n is recorded. In the latter half of the image directory 83 (n + 2), which is one sector away from the search data D
Record n. Of course, the search data D (n + 2) of the image data 81 corresponding to the directory 83 (n + 2) is recorded in the first half of the image directory 83 (n + 2), while the latter half of the image directory 83n is recorded. In this area, the same search data S (n-2) as that recorded in the first half of the image directory 83 (n-2) that is two directories before the directory 83n is recorded. As described above, each search data D is 2
It is recorded heavily.

On the other hand, as described above, before and after the image data 81, the same header 81A and blocks 81B and 81C are recorded in duplicate. Since the image data 81 is recorded in the sectors of two tracks or more, the same header 81A is used for both blocks 81B and 81B.
The Cs will always be recorded with one sector or more separated from each other in the disk circumferential direction and the radial direction.

Next, image retrieval and re-output will be described. As described above, the magnetic disk 65 stores the patient information S2 and the imaging information S3 to construct a database for image retrieval. The image searcher is the display device of the console 61.
By operating the keyboard 61A while observing 61B, desired search data is input. System controller 51
Searches the images corresponding to the input search data from the database built on the magnetic disk 65, and displays the image list of those images on the display device 61B.
As the search data, in principle, all the information of the patient information S2 and the imaging information S3 can be used. For example, the patient name in the patient information S2 is designated as the search data. The display device 61B displays the image numbers of all images related to the designated patient, and the image list showing the patient information S2 other than the name and the imaging information S3.
The searcher looks at this displayed image list, selects a desired image, and makes a reservation for re-output. The reserved image number is stored in the memory 54. By doing so, even if the image processing device 30 and the image output device 70 are operating to immediately output an image based on the image data S1 sent from the radiation image information recording / reading device 10, an image search is performed. Only the work can be done. Further, even if the searched image is recorded on an optical disk other than the optical disk 67 loaded in the optical disk device 52 at the time of search, the search work will not be wasted, and after the above reservation, The optical disc on which the reserved image is recorded is loaded into the optical disc device 52, and the image re-output can be continued.

After the above-mentioned reservation is made, when information indicating that the image processing device 30 has stopped operating is input to the system control device 51, the system control device 51 drives the optical disc device 52 to make a reservation from the optical disc 67. The image is read. At the time of this image reading, the first directory entry block 88A serves as a pointer to give a reading instruction of the image directory group (area 82), and the image directories 83A, 83B, 83C ... Are read. And one image directory with the reserved image number
One header 81A indicated by the image directory 83 is designated by using 83 as a pointer, and the recorded contents of the header 81A and the corresponding image data 81 and blocks 81B and 81C are read.

Image data 81 (S1) read out as described above
Then, the patient information S2 and the imaging information S3 recorded in the header 81A, and the image processing data S4 recorded in the blocks 81B and 81C are transferred from the system control device 51 to the image processing device 30. Image data 81 is the image processing device
In 30, after receiving the image processing such as the gradation processing and the frequency processing according to the image processing condition indicated by the data S4,
It is sent to the image output device 70. In the image output device 70, based on this image-processed image data S1 ′,
An image is output in the same manner as described above, and a hard copy 71 of the radiation image is formed. The patient information S2 and the photographing information S3 are used to write the patient information and the photographing information in the hard copy 71.

When reading the image data 81 as described above, the CPU 53
If the search data Dn recorded in the first half of the n-th image directory 83n cannot be read, the (n
The contents recorded in the latter half of the (+2) th image directory 83 (n + 2) are read and used as search data for the image data 81 corresponding to the image directory 83n. By doing this, dust on the surface of the optical disc 67,
Even if a reading error occurs once due to scratches, stains, or chemical changes, all the image directories 83A, 83B, 83C ... Can be read reliably.

When reading the recorded contents of the header 81A, the blocks 81B, and 81C that are double recorded in each image data 81, the same reading process as described above is performed, and thereby the same effect is obtained.

When such double writing is performed, the same data is always recorded in two sectors which are separated by at least one sector in the disk circumferential direction and the radial direction. That is, the sector that records the same data as the recording data of the sector S shown in FIG.
Recording is performed from the hatched sector to the outer sector.
As shown in FIG. 4, when the dust G is large, it is possible that one dust G adheres to the two sectors with one track in between. Even when the sectors are set apart from each other in the track arrangement direction (disk radial direction), it is preferable to set both sectors sufficiently apart in the disk circumferential direction.

The embodiments to which the method of the present invention is applied when recording image search data have been described above, but the method of the present invention can be similarly applied to the case of recording data other than this type of data on an optical disc. Is.

Further, in the case of applying the method of the present invention, it is needless to say that the read error correction may be executed by the above error correction code.

(Effects of the Invention) As described in detail above, according to the method of recording data on an optical disc of the present invention, even if dust, scratches, dirt or the like is attached to the optical disc surface or a chemical change occurs, the recorded data can be reliably recorded. The data can be read, and the reliability of the data recording system using the optical disc is greatly improved.

Further, the present invention focuses on the fact that one sector of an optical disc often has a margin larger than the byte length of one unit of data, and the data is double recorded by effectively utilizing this margin portion. The reliability can be improved without reducing the storage capacity as a whole.

[Brief description of drawings]

1 is a schematic diagram showing an example of a sector format according to the method of the present invention, FIG. 2 is a schematic diagram showing an example of an image filing apparatus for recording data by the method of the present invention, and FIG. 3 is used for the image filing apparatus. FIG. 4 is an explanatory diagram for explaining the outline of the recording format of the optical disc, and FIG. 4 is an explanatory diagram for explaining the method of the present invention. 50 ... Image filing device 51 ... System control device, 52 ... Optical disc device 67 ... Optical disc 81 ... Image data recorded on optical disc 81A ... Header 81B, 81C ... Block 83 recording image processing data ... ... Image directory, S1 ... Image data S2 ... Patient information, S3 ... Imaging information S4 ... Image processing data D ... Search data recorded on the optical disc

Claims (1)

[Claims] 1. A method of recording data on an optical disc having a recording area divided into sector units, wherein 1 of the data is recorded.
When the unit byte length is less than 1/2 of the sector byte length, each data is divided into the first half of the sector having the smaller sector number and the sector having the larger sector number of the two sectors separated from each other by one sector or more. The method for recording data on the optical disc is characterized by double recording on the latter half of the sector.