KR101414606B1 - Recording medium, Method and Apparatus for recording data on the recording medium - Google Patents

Abstract

The present invention relates to a recording medium, a recording medium recording method, and a recording apparatus. More particularly, the present invention relates to a recording medium using a holography, a recording medium recording method, and a recording medium recording apparatus.

According to another aspect of the present invention, there is provided a method of measuring a distortion characteristic of a recording apparatus, the method comprising: measuring a distortion characteristic of a recording apparatus using a test image; Determining an interval between reference patterns in the data image according to the measured distortion characteristics; And inserting and recording the reference pattern in the data image according to the determined interval.

Hologram, Distortion Characteristics, Correction

Description

Technical Field [0001] The present invention relates to a recording medium, a recording medium recording method,

The present invention relates to a recording medium, a recording medium recording method, and a recording apparatus. More particularly, the present invention relates to a recording medium using a holography, a recording medium recording method, and a recording medium recording apparatus.

Due to recent developments in technology, high capacity and high density recording media have emerged. Examples of such a recording medium include a CD (Compact Disc) and a DVD (Digital Versatile Disc). In addition, there is a BD (Blu-ray Disc) which is a next generation recording medium which dramatically increases the recording capacity or a recording medium using holography. Particularly, in the case of a recording medium using holography, data can be superimposed on the volume of the recording medium by using the diffraction and interference characteristics of light, and the capacity thereof can be remarkably increased. However, errors may occur in optical and geometric characteristics of the system when data is recorded and reproduced. Therefore, there is a need for an apparatus and a method that can compensate for such errors and record or reproduce the same on a recording medium

An object of the present invention is to provide a recording medium, a recording medium recording method, and a recording medium recording apparatus that can more accurately compensate for errors that occur during recording or reproduction.

According to another aspect of the present invention, there is provided a method of measuring a distortion characteristic of a recording apparatus, the method comprising: measuring a distortion characteristic of a recording apparatus using a test image; Determining an interval between reference patterns in the data image according to the measured distortion characteristics; And inserting and recording the reference pattern in the data image according to the determined interval.

It is another object of the present invention to provide a method and apparatus for measuring a distortion of a recording apparatus using a test image and determining an interval between reference patterns in a data image according to the measured distortion degree; And a light output section for inserting and recording the reference pattern in the data image according to the determined interval.

It is still another object of the present invention to provide a method and apparatus for measuring a distortion of a recording apparatus using a test image. Recording the measured degree of distortion in a recording device; And determining an interval between the reference patterns in the data image according to the measured degree of distortion.

It is still another object of the present invention to provide a method and apparatus for measuring a distortion of a recording apparatus using a test image. Determining an interval between reference patterns in the data image according to the measured degree of distortion; And recording the interval between the reference patterns in the data image to the recording medium.

It is still another object of the present invention to provide a method and apparatus for measuring distortion characteristics of a recording apparatus using a test image. Determining an interval between reference patterns in the data image according to the measured distortion characteristics; And inserting and recording the reference pattern in the data image according to the determined interval.

Yet another object of the present invention is to provide a method and apparatus for generating and recording a test image including a reference pattern, Reading the recorded test image and comparing the recorded test image with the read test image; And obtaining the distortion characteristic of the recording apparatus by obtaining the movement of the test image to obtain the distortion characteristic of the recording apparatus.

It is still another object of the present invention to provide a recording and reproducing apparatus, which is capable of recording and reproducing information on a recording medium, including a first area including position and shape information of a reference pattern embedded in a data image, And a second area including the data image.

The recording medium recording method and recording medium recording apparatus according to the present invention have the following effects. The recording medium recording method and the recording medium recording apparatus according to the present invention can measure the distortion degree according to the configuration of the system and effectively compensate it. Further, there is an advantage that additional recording or reproducing can be performed in consideration of the characteristics of the recording apparatus and recording on the recording medium.

Hereinafter, preferred embodiments of a recording medium recording / reproducing method and a recording / reproducing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

In addition, the term used in the present invention has been selected as a general term that is widely used at present, but in some cases, there is a term arbitrarily selected by the applicant. In this case, the meaning is described in detail in the description of the present invention. It is to be understood that the present invention should be grasped as a meaning of a term that is not a name of the present invention.

In the present invention, the term "recording medium " means any medium on which data is recorded or recordable. For example, the term " recording medium " Hereinafter, the present invention will be described with reference to a disk as a recording medium, particularly, a "holography recording medium" for the convenience of explanation, but it should be apparent that the technical idea of the present invention is equally applicable to other recording media.

1 is an embodiment of a recording apparatus and / or reproducing apparatus according to the present invention. In FIG. 1, the general components are omitted and only the components necessary for explaining the technical gist of the present invention are shown. 1, a recording medium recording / reproducing apparatus according to the present invention includes a light source unit 11, first and second light split units 13 and 16, a light control unit 14, an optical modulation unit 15, An image sensor 17, an image sensor 18, and a control unit 20.

The light source unit 11 is composed of a gas laser, a solid-state laser, a semiconductor laser, a semiconductor diode, or the like that generates highly coherent light, for example, light such as a laser beam. In addition, a lens for collecting the light output from the light source unit 11 so as not to be dispersed, for example, a collimator lens, may be disposed at the output end.

The first light splitting unit 13 receives light output from the light source unit 11 and divides the light into a signal light and a reference light. The first light splitting unit 13 may be composed of one or more grating layers for diffracting light with one or more transparent substrates or a mirror for reflecting a part of light and passing the rest. Part of the light that has passed through the first light splitting section 13 is incident on the second light splitting section 16 and part of the light is incident on the light modulation section 15.

The optical modulator 15 generates signal light containing data by using the light output from the first light splitting unit 13 under the control of the control unit. For convenience, the signal light containing the data may be referred to as "first light ". For example, the optical modulation unit 15 may include binary data represented by black and white dots in the signal light. At this time, for convenience, the white dot may be referred to as " On "and the black dot may be referred to as" Off ". Alternatively, it can be named.

Also, the first light may include data, in which a series of data including user data to be recorded by the user may be recorded. In addition to user data, recorded data includes control information and a mark for indicating a zone of data.

Further, the data generated from the light modulator 15 may be data having a two-dimensional image. Such data can be conveniently referred to as a "data image ". The data image can be expressed using binary dots of on (0n) / off (Off) as described above. In order to express each pixel of the data image in binary dot, the light modulator 15 may display the data image in pixel units or pixel block units, and may be controlled by the control unit.

Further, the light modulating section 15 can generate a test image. The test image is a data image for measuring the distortion characteristics of the recording apparatus. The test image is recorded with relatively simple data, so that it is possible to easily compare data before and after recording or before and after recording to measure distortion characteristics. For example, the test image may be a pattern in which the same pattern is inserted at regular intervals.

At this time, the inserted pattern may be a pattern in which there is little distortion in the pattern itself during recording or reproduction, and a certain degree of symmetry is secured during recording / reproduction. As an example of such a pattern, it includes a multi-divisional area, and each divisional area may be a pattern that is symmetrical and / or inversion and / or rotation relationship. The symmetry can be symmetrical in the up, down, left, right, or diagonal directions. Inversion means that the black and white of the pattern has changed. Rotation means that the pattern is rotated while maintaining a constant angle. For example, the pattern may be rotated by 90 °, 180 °, or 270 °. In order to stabilize the center frequency, the number of black / white dots can be set to be the same. In addition, a pattern including such characteristics can be referred to as a reference pattern.

In addition, the reference pattern can be used for a test image as well as for a data image. The reference pattern inserted in the data image can serve to correct the data image when reading or reproducing the data image, which will be described in detail later.

Further, the test image may be a set of reference patterns inserted in the data image, which has been used in the previous recording or reproducing step.

The first light that is a signal beam is irradiated onto the recording medium 100, and the second light is incident on the recording medium. The second light is incident on the second light splitting part, and the light from the second light splitting part is incident on the recording medium via the light adjusting part 14. [

The second light may be referred to as a reference beam or a reference beam. The reference beam refers to a beam that causes interference with the first light when data is recorded on the recording medium 100. Further, the reference beam means a beam used when reading data from the recording medium. However, as shown in FIG. 1, the reference beam and the reference beam may be used as those coming from the same light source. The light control unit 14 adjusts an incident angle, a direction, a wavelength, a phase, and the like of the second light according to the control of the control unit, thereby to input the second light to the recording medium 100.

At this time, different interference fringes are recorded on the recording medium in accordance with the phase and the wavelength of the reference beam. Therefore, the reference beam may be repeatedly and superimposedly recorded on the same area of the recording medium by changing the phase or wavelength of the reference beam. By using such a characteristic, the capacity of the holographic recording medium can be increased. That is, a plurality of data images can be recorded in one area.

Alternatively, a component called "first light output portion" may be used in the present invention as a component including both the light source and the characteristics of the first light splitting portion. Further, a component called "second light output portion" as an element including the light source and the second light splitting portion and the light control portion described above may be used in the present invention.

In recording the recording medium, both of the first and second light splitting sections should be used. On the other hand, at the time of reproduction of the recording medium, even if only the reference beam is used, the image recorded on the recording medium can be read. Therefore, according to the present invention, only the second divided light portion can be used at the time of reproducing the recording medium.

At the time of reproduction, information can be read by irradiating the recording medium with light having the same phase and wavelength as those used at the time of recording. Therefore, the phase, wavelength, incidence angle of the light control unit, etc. used in recording can be recorded or stored in the memory 17 and used at the time of reproduction.

Further, the memory 17 can store distortion characteristics and the like according to the recording apparatus. In addition, the memory may temporarily store the position of the reference pattern inserted in the data image, and may record the data on the recording medium. Further, the memory 17 may record the data stored on the recording medium under the control of the control unit or use it for recording / reproducing. In addition, the memory 17 may store data to be recorded on the recording medium, and may also store information other than user data among data recorded on the recording medium.

The image sensor 18 may be composed of a photodetector element such as a charge-coupled device (CCD) or a CMOS. It may also be composed of a plurality of optical detectors. For example, it may be composed of a plurality of optical detectors capable of providing resolutions such as 300 * 200, 1000 * 800, and the like. The image sensor 18 receives light reflected by the recording medium 100 or passes through the recording medium, and captures / reads a data image included in the received light. For example, the image sensor shown in Fig. 1 receives light passing through a recording medium. Or a phase conjugate signal light (corresponding to a data image) generated in a direction reflected from the recording medium. The image sensor may also be named as a light receiving portion.

The control unit 20 can read the data recorded in the memory 17 or the recording medium, generate new data, and provide the new data to the light modulation unit 15. In addition, the control unit 20 controls the light modulation unit 15 to generate a two-dimensional bitmap expressed by black and white dots of data read from the memory. Also, the control unit controls the light control unit 14 to adjust the intensity, incident angle, phase, wavelength, etc. of the second light that interferes with the first light. It is possible to store a plurality of data images (data pages) in the same area of the recording medium 100 by controlling the light control unit 14 as described above. Also, the light control unit 14 may be controlled so that a beam having the same condition as that at the time of recording is incident to reproduce the data image stored in the recording medium. The control unit 20 can detect the light intensity (luminance) in the two-dimensional directions of the sample data read by the image sensor 18, that is, the x direction (horizontal) and the y direction (vertical).

Also, the control unit 20 may determine the distortion characteristics of the recording apparatus using the test image. This can be judged by recording and reproducing a test image. Further, the control section 20 may record the measured distortion characteristic to a recording medium or a recording apparatus. In addition, the interval of the reference pattern inserted in the data image may be determined according to the distortion characteristic.

As the recording medium 100, a recording medium in the form of a disk or a volume can be used.

Figure 2 is one embodiment of a test image according to the present invention. The test image may include a reference pattern. Alternatively, the test image may include only the reference pattern. In order to obtain the distortion characteristics of the recording / reproducing apparatus, reference patterns may be inserted at equal intervals as shown in Fig. Or if the data image tends to become more distorted as it goes to the outer periphery, it may be arranged at a more closely spaced distance toward the outer periphery. FIG. 2 also shows an embodiment of the reference pattern according to the present invention. The reference pattern exemplified in the present invention is composed of four divided areas, and each of the areas has symmetry, inversion, and rotation relation. In addition, the number of black / white dots can be made the same for each reference pattern in order to stabilize the center frequency.

In Fig. 2, the reference patterns are spaced at equal intervals in the horizontal and vertical directions. Or may be arranged so that the horizontal direction and the vertical direction are equally spaced. Also, the interval may vary depending on the characteristics of the recording apparatus and the size of the data image to be recorded. The spacing between reference patterns can be controlled in pixel units or pixel block units.

3A shows the distortion characteristics of the recording / reproducing apparatus obtained using the test image shown in FIG. This can be obtained by generating a test image and recording it on a recording medium as in the embodiment shown in FIG. 2, and reproducing it again. When the test image is recorded on the recording medium, information on the test image can be recorded in the recording apparatus or the recording medium. That is, the information about the shape of the reference pattern inserted into the test image, the position information of the reference pattern inserted into the test image, and the like are recorded in the recording apparatus or the recording medium.

The recorded test image is reproduced again and compared with the information about the test image stored at the time of recording. At this time, the comparison can be performed for each reference pattern recorded in the test image. That is, the position of the reference pattern of each recorded test image can be compared with the position of the reproduced reference pattern. In particular, the recorded reference pattern is compared with the reproduced reference pattern, and the moving distance and the moving direction of each reference pattern can be obtained and displayed as shown in FIG. 3A or FIG. 3B. As shown in Figs. 3A and 3B, a map showing the movement distance and the movement direction of the reference pattern before and after recording may be referred to as a " shift map ". The shift map can indicate the distortion characteristics of the recording apparatus.

Each circle shown in Figs. 3A and 3B represents the position of the reference pattern recorded on the recording medium. The straight line attached to each circle indicates the movement distance and the movement direction of each reference pattern. In addition, the horizontal axis and the vertical axis in FIGS. 3A and 3B indicate the size of each test image in pixel units.

3A and 3B show distortion characteristics of different recording apparatuses. 3A, it can be seen that the degree of distortion decreases from the shift map toward the lower left corner. Also, it can be seen that the distortion becomes worse toward the upper right side. In FIG. 3B, it can be seen that the distortion decreases toward the central region at the lower right end. Such a distortion characteristic of the recording apparatus is a factor that can be varied depending on the alignment state of the optical axes and the component error of each recording apparatus, even in the case of the same type of recording apparatus. Therefore, it is necessary to compensate for each recording apparatus, and it is preferable to measure and compensate the distortion characteristic for each recording apparatus as in the present invention.

4 shows a state in which the reference pattern is inserted into the data image according to the measured distortion characteristics after measuring the distortion characteristics of the recording apparatus according to the present invention. Particularly, the embodiment in which the reference pattern is inserted when the distortion characteristic exhibits the characteristic as shown in Fig. 3A is shown. It can be seen that the degree of distortion of the recording apparatus in the shift map of FIG. Therefore, the reference pattern can be arranged closer to the upper right direction, which is the direction in which the distortion becomes deeper.

The reference pattern inserted at the time of recording the data image may serve to compensate the data image when reproducing the data image. For example, the position and shape of the reference pattern inserted in the data image can be stored in advance in the recording medium or the recording apparatus. It is possible to consider the movement of the data image by comparing the position of the reference pattern previously stored at the time of reproduction of the recording medium with the position of the reproduced reference pattern. However, it is also possible to show a different moving form for each data image area. At this time, it is possible to grasp the movement of the data image locally moved for each region by using the position and shape of the reference pattern, which is known information in advance.

That is, considering movement of the reference pattern inserted in the data image, the movement of the data recorded in the area adjacent to each reference pattern can be compensated. If the movement of the data image is not uniform throughout the data image, positioning of the reference pattern can be an important factor. The movement of the data between the reference patterns is compensated by considering the movement position of the reference pattern. If the spacing of the reference pattern is too wide relative to the degree of distortion of the data image, effective correction will not be achieved. Also, if the intervals of the reference patterns are arranged more densely than the degree of distortion of the data image, the recording / reproducing efficiency of the recording medium will be lowered.

At this time, if the degree of distortion of the recording apparatus is determined in advance through the test image and the reference pattern is inserted in accordance with the degree of distortion, the recording / reproducing of the recording medium can be effectively performed.

5 is a flowchart showing an embodiment of a method for measuring a distortion characteristic of a recording apparatus according to the present invention. First, a test image is generated (s10). The method and the embodiment relating to the generation of the test image can be referred to the description relating to FIG. 2 and FIG. 2 described above. The test image can be generated by the control unit of the recording apparatus and recorded on the recording medium through the optical output unit (s20). Alternatively, in the case of a recording medium for recording, a test image may be inserted into the recording medium in advance.

When the test image is recorded on the recording medium, the information about the test image can be temporarily stored in the recording apparatus. As an example, information on the shape of the reference pattern inserted in the test image and the interval between the reference patterns can be temporarily stored in the memory of the recording apparatus. If a test image is recorded and output on a recording medium, information on the test image can be recorded in a specific area of the recording medium.

In order to measure the distortion characteristics of the recording apparatus, a recorded test image is reproduced (s30). The test image is reproduced to detect the position of the reference pattern recorded in the test image. The position of the reference pattern detected by reproduction can be compared with the position of the reference pattern recorded in the recording apparatus or a specific region of the recording medium. At this time, the position of the reproduced reference pattern may be compared with the position of the recorded reference pattern to obtain the positional shift between the corresponding reference patterns. Further, the shift map can be obtained by obtaining the position shift of the corresponding reference pattern (s40).

The shift map reflects the distortion characteristics of the recording apparatus. That is, depending on the combination of the optical components of the recording apparatus and the like and the alignment state of the optical axis, the movement characteristics in the test image are changed. Further, in considering the position of the reference pattern to be inserted at the time of correcting the data image, a shift map can be used. That is, the insertion position of the reference pattern can be set using the shift map (s50). For example, in the case of an area having a large shift amount of the reference pattern in the shift map, it is possible to insert the reference pattern at a finer interval. Further, in the case of a small area, which is relatively the movement amount of the reference pattern, it is possible to insert the reference pattern at wide intervals.

After creating the shift map, the distortion characteristic of the recording apparatus is recorded in the storage space of the recording apparatus (s60). The distortion characteristic of the recording apparatus may be a shift map prepared in advance. Alternatively, the distortion characteristic may be the insertion position of the reference pattern obtained using the shift map.

6 is a recording medium recording method according to the present invention. A reference pattern is inserted into the data image (S110). The insertion position of the reference pattern determines the position of the reference pattern by reflecting the distortion characteristics of the recording apparatus, as described above. Alternatively, the reference pattern can be inserted by determining the position of the reference pattern using the shift map. At this time, the reference pattern can be arranged more densely in a region where the distortion is severe, that is, in a region where the movement between the reference patterns is large before recording / reproducing. Also, in the case of a recording medium on which a plurality of data images are recorded, a plurality of different reference patterns may be repeatedly inserted with a predetermined period or rule.

The data image in which the reference pattern is inserted is recorded on the recording medium (s120). At this time, an area for recording the data image may be allocated to the recording medium. For example, in order to record a data image on a recording medium, an area may be assigned to the recording medium under the name of a data area or a user data area. During recording, the signal and reference light are used as described above, and interference can be recorded. In addition, it has been described that the data image can be recorded in the same area by varying the incident angle, the phase or the wavelength of the reference light.

Further, not only the data image in which the reference pattern is inserted is recorded on the recording medium, but also information on the position and shape of the reference pattern is also recorded on the recording medium (s130). At this time, information on the position and shape of the reference pattern can be assigned to a specific area on the recording medium and recorded. As an example, a management area can be allocated to record information about a reference pattern. As another example, a control information area may be allocated to a lead-in area to record information about the reference pattern. In addition, information on the reference pattern may be recorded more than once in order to secure reliability.

7 is an embodiment of a recording medium reproducing method according to the present invention. 7 is a flowchart illustrating a method of reproducing a recording medium according to the present invention. First, an area in which all management information related to the recording medium is recorded is read out (s210). For convenience, this area is referred to as the "control area ". The control area contains information about the position and shape of the reference pattern inserted in each data image.

After reading the information on the reference pattern in the control area, the recorded data image is read out in the data area (s220). As described above, a reference pattern for correction is inserted in the data image. While reading the data image, the reference pattern inserted in the data image is also read out. At this time, the position of the reference pattern read from the data image is compared with the position information of the reference pattern recorded in the control area. By comparing the positions of these two kinds of reference patterns, the amount of movement of data can be obtained at the time of data image recording / reproduction. The data of the data image area can be corrected according to the obtained movement amount (s230).

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments but should be determined according to the claims.

1 is an embodiment of a recording medium recording / reproducing apparatus according to the present invention.

2 is an embodiment of a test image according to the present invention.

3A and 3B are diagrams showing distortion characteristics of a recording apparatus measured according to the present invention.

FIG. 4 is an embodiment of a reference pattern configuration according to the present invention.

5 is a flowchart showing a recording method according to the present invention.

6 is a flowchart showing a recording method according to the present invention.

7 is a flowchart showing a reproducing method according to the present invention.

Claims (39)

Measuring a distortion characteristic of the recording apparatus using a test image; Determining an interval between reference patterns in the data image according to the measured distortion characteristics; And inserting and recording the reference pattern in the data image according to the determined interval. The method according to claim 1, Wherein the test image is a two-dimensional data image. 3. The method of claim 2, Wherein the test image is formed by arranging reference patterns at regular intervals in the horizontal and vertical directions. The method according to claim 1, wherein measuring the distortion characteristic of the recording apparatus comprises: Recording the test image; Reproducing the test image; And comparing the recorded test image with the reproduced test image. 5. The method of claim 4, Wherein comparing the recorded test image with the reproduced test image obtains a positional shift before and after reproduction of each reference pattern in the test image. 6. The method of claim 5, Wherein the obtaining of the positional movement obtains the moving distance and the moving direction. The method according to claim 1, Wherein the interval between the reference patterns is arranged at a narrower interval as the degree of distortion is severe. The recording medium recording method according to claim 1, wherein inserting the reference pattern into the data image inserts the reference pattern into a data image including user data and control data. The method according to claim 1, Wherein the recording method further comprises recording position and shape information of a reference pattern in the data image to a recording medium. 10. The method of claim 9, Wherein the recording of the position and shape information of the reference pattern is performed once or more on the recording medium. 10. The method of claim 9, Wherein the recording of the position and shape information of the reference pattern is performed in an area allocated to the recording medium. 12. The method of claim 11, Wherein the allocated area of the recording medium is allocated to a lead-in area of the recording medium. The method according to claim 1, Wherein the recording method further comprises recording the distortion characteristic of the recording apparatus in a storage space of the recording apparatus. The method according to claim 1, Wherein the recording method further comprises recording the position and shape information of the reference pattern in the data image in a storage space of the recording apparatus. The method according to claim 1, Wherein the reference pattern is composed of a plurality of divided areas, and each of the divided areas is in an inverted or rotated or symmetrical relationship. The method according to claim 1, Wherein the recording method uses a hologram. The method according to claim 1, Wherein the test image may be a set of reference patterns of a previously recorded or reproduced data image. A controller for measuring a degree of distortion of the recording apparatus using a test image and determining an interval between the reference patterns in the data image according to the measured degree of distortion; And a light output section for inserting and recording the reference pattern in the data image according to the determined interval. 19. The method of claim 18, Wherein the test image is a two-dimensional data image. 20. The method of claim 19, Wherein the two-dimensional data image is configured such that reference patterns are arranged at regular intervals in the horizontal and vertical directions. 19. The method of claim 18, Wherein the distortion degree is measured by comparing data before and after the reproduction of the test image. 19. The method of claim 18, Wherein the interval between the reference patterns is determined such that the interval between the reference patterns is shorter in a region where the degree of distortion is severe. Measuring a degree of distortion of the recording apparatus using a test image; Recording the measured degree of distortion in a recording device; And determining an interval between the reference patterns in the data image according to the measured degree of distortion. Measuring a degree of distortion of the recording apparatus using a test image; Determining an interval between reference patterns in the data image according to the measured degree of distortion; And recording the interval between reference patterns in the data image to a recording medium. Measuring a distortion characteristic of the recording apparatus using a test image; Determining an interval between reference patterns in the data image according to the measured distortion characteristics; And inserting and recording the reference pattern in the data image according to the determined interval. Generating and recording a test image including a reference pattern; Reading the recorded test image and comparing the recorded test image with the read test image; And obtaining the distortion characteristic of the recording apparatus by obtaining the movement of the test image. 27. The method of claim 26, Wherein the test image is a two-dimensional data image including the reference pattern. 28. The method of claim 27, Wherein the test images are arranged at regular intervals in the two-dimensional data image. 27. The method of claim 26, Wherein comparing the recorded test image with the read test image compares corresponding reference patterns in each test image. 27. The method of claim 26, Wherein the step of obtaining the movement of the test image obtains the movement of the reference pattern in the test image. 31. The method of claim 30, Wherein the movement of each of the reference patterns determines a movement distance and a movement direction of each reference pattern. 27. The method of claim 26, Wherein the distortion characteristic of the recording apparatus is represented by a movement map before and after the reproduction of the test image. 27. The method of claim 26, Wherein the distortion characteristic of the recording apparatus is recorded in an allocated area of the recording medium. 27. The method of claim 26, Wherein the distortion characteristic of the recording apparatus is recorded in a storage space of the recording apparatus. A first area including position and shape information of a reference pattern embedded in the data image reflecting the distortion characteristics of the recording apparatus; And a second area including the data image. 36. The method of claim 35, Wherein a distortion characteristic of the recording apparatus is measured using a test image. 37. The method of claim 36, Wherein the test image is a two-dimensional data image in which reference patterns are arranged at regular intervals. 36. The method of claim 35, Wherein the recording medium can further comprise a test image. 36. The method of claim 35, Wherein the recording medium can be recorded and / or reproduced using a hologram.

Images