KR100676871B1 - Apparatus for detecting optical information, method of detecting for optical information using the same - Google Patents

Abstract

An optical information detector and an optical information detection method using the detector are provided to divide images detected by being oversampled into a sampling data area and a compensated data area, and to reflect a predetermined compensation value for the compensated data area to detect optical information, thereby improving data processing speed. An optical detector(110) detects an image of a source data page which has a data area consisting of a balance code and an identifier for discriminating the data area, in over pixel type. An optical information processor(100) decides on a data detection area corresponding to the data area from the image of the data page detected from the optical detector(110), selects a balance code detection pixel unit corresponding to the balance code from the data detection area, and reproduces the balance code from the balance code detection pixel unit to restore the source data page.

Description

Apparatus for detecting optical information, method of detecting for optical information using the same}

1 is a block diagram showing the configuration of an optical information reproducing apparatus including an optical information detecting apparatus according to a preferred embodiment of the present invention.

2 is a block diagram showing the configuration of an optical information detection apparatus according to an embodiment of the present invention.

3A is a diagram exemplarily illustrating a case where 1: 1.5 pixel matching is correctly performed in the optical information detecting method according to an exemplary embodiment of the present invention.

3B is a diagram exemplarily illustrating a case where 1: 1.5 pixel matching is not correctly performed in the optical information detecting method according to an exemplary embodiment of the present invention.

4A is a diagram illustrating a source data page configuration in an optical information detecting method according to an exemplary embodiment of the present invention.

4B is a diagram illustrating a detection data page in which the source data page of FIG. 4A is detected.

5 is a flowchart illustrating an optical information detection method according to an embodiment of the present invention.

FIG. 6 is a diagram illustrating a portion of an area where a source data page is detected by a photo detector in an optical information detecting method according to an exemplary embodiment of the present invention.

FIG. 7 is a diagram illustrating a balance code detection pixel unit of a detection data page for a 6: 8 balanced coded source data page in the optical information detecting method according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

110 ... light detector

120.Optical information processor

130.Identification area detection module

140.Data area detection module

150 ... balance code playback module

160 ... Data Restoration Module

The present invention relates to an optical information detecting apparatus and an optical information detecting method using the same, and more particularly, to an optical information detecting apparatus capable of detecting reliable optical information and improving a storage density, and to detecting the optical information using the same. It is about a method.

In recent years, as the demand for a next generation storage system having a large storage capacity increases, a light processing system using holography, that is, a holographic light processing system, has attracted attention.

The holographic optical information processing system records the interference pattern on the optical information storage medium by intersecting the signal light containing data and the reference light provided from an angle different from the signal light at a predetermined position of the optical information storage medium. In addition, when the stored information is reproduced, the reference light is irradiated to the stored interference pattern, and the original data is restored by using diffraction generated by the interference pattern.

The holographic optical information processing system can store data at the same position of the optical information storage medium by using various multiplexing techniques, and can store and reproduce the superimposed stored data separately from each other. Can be implemented. In this case, the multiplexing technique includes angle multiplexing, wavelength multiplexing, phase code multiplexing, and the like.

On the other hand, the holographic optical information processing system processes digital data in predetermined page units, and the data in such page units is called a data page. That is, the holographic optical information processing system processes data in units of data pages. The optical information processing procedure in units of data pages is disclosed in US Patent No. 670923, Japanese Patent Application Laid-Open No. 1998-97792, and the like.

The holographic optical information processing system encodes input data in units of data pages, generates an image of a two-dimensional data page by mapping each encoded binary data to each pixel, and stores the optical information by projecting the image onto a signal light. Investigate in the media. Such optical modulation may be performed through a spatial light modulator (SLM).

In this case, a reference light irradiated from an angle different from the signal light is incident on the optical information storage medium. The signal light and the reference light interfere with each other in the optical information storage medium, so that an image of the data page contained in the signal light is recorded in the optical information storage medium in the form of an interference pattern.

By this process, the image of the data page recorded on the optical information storage medium can be reproduced by irradiating the interference pattern with reference light. The image of the reproduced data page may be detected through a light-receiving element pixel array, for example, a complementary metal-oxide semiconductor (CMOS) or a charge coupled device (CCD). At this time, the image of the detected data page is reproduced as original data through a predetermined signal processing and decoding process.

Meanwhile, sampling techniques may be used to detect an image of a data page using the light receiving element pixel array. The conventional sampling technique mainly uses 1: n (n is an integer) pixel matching method. Among them, in the 1: 1 pixel matching method, since one data pixel directly corresponds to one detection pixel, the storage density at the time of image detection is high. However, due to the shrinkage or rotation of the optical information storage medium, the position of the reproduced image formed on the light receiving element pixel array is changed, and as a result, misalignment occurs, thereby causing the data pixel and the light receiving pixel. There is a problem that can be mismatched with each other, thereby causing a phenomenon that the image of the data page detected by the light receiving element pixel array is severely degraded (degradation) to obtain accurate information.

The 1: 2 oversampling method detects one data pixel as four (2 × 2) detection pixels. Even if pixel mismatching occurs, one of the four detection pixels may detect light of the data pixel. So that reliable data can be obtained. However, this 1: 2 oversampling method has only 25% less data storage density than the pixel matching method.

In addition, the 1: 3 oversampling method detects one data pixel as nine (3 × 3) detection pixels. Even if a mismatch between the data pixel and the detection pixel occurs randomly, The detection pixel can obtain reliable data from an image detected by the detection pixel at a speed that can detect the light of the data pixel. However, such a 1: 3 oversampling method requires too many detection pixels to detect one data pixel at the time of image detection, so the storage density is too low.

As described above, the conventional pixel matching method has a good storage density but is too weak for misalignment between pixels. In the conventional 1: 3 oversampling method and the 1: 2 oversampling method, the data detection reliability is high but the storage density is high. There is a problem too low. Therefore, there is a need for an optical information detection method capable of satisfying a high storage density while ensuring the reliability of data detection.

On the other hand, as mentioned earlier, it is mentioned that the detection element for detecting light is detected through a light receiving element pixel array, for example, CMOS or CCD. However, the area where light is actually received in the detection pixel of the light receiving element pixel array is a part of the total detection pixel area, and the remaining area is an area where no light is received at all by other areas such as a circuit pattern or an accumulation area. Therefore, in the conventional oversampling method as described above, since the light receiving area of the detection pixel is not considered at all, there is a problem that causes a significant error in detecting the optical information.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and an object of the present invention is to divide an image detected by oversampling into a sampling data area and a compensation data area, and reflect optical information by reflecting a predetermined compensation value for the compensation data area. An optical information detecting apparatus and an optical information detecting method are provided.

Another object of the present invention with respect to the above object is an optical information detecting apparatus and a light which makes it possible to detect optical information by reflecting a light receiving area of a detection pixel through 1: n (n is a non-integer greater than 1). It is to provide an information detection method.

An optical information detecting apparatus according to the present invention for achieving the above object is an optical detector for detecting an image of a source data page having an identification portion for distinguishing the data region and the data region of the balance code as an overpixel, the optical detector A data detection area corresponding to the data area is determined from an image of the detected data page detected by, a balance code detection pixel unit corresponding to the balance code is selected in the data detection area, and the balance is determined from the balance code detection pixel unit. And an optical information processor for reproducing the source data page by reproducing a code.

The optical information processing unit includes an identification unit detection module detecting the identification unit, a data area detection module detecting a matching state of the data area using the detected identification unit, and the balance code detection detected by the data area detection module. And a balance code reproducing module for reproducing the balance code from a pixel unit, and a source data page reconstruction module for reconstructing the source data page with the reproduced balance code.

The identification unit detecting module detects a first identification region located in a first direction and a second identification region disposed in a second direction orthogonal to the first identification region among the detection pixels detected by the photo detector. A first detection detection pixel line having a maximum intensity among the second identification areas, a second identification detection pixel line having a second intensity, and a first identification detection pixel line in contact with the first identification detection pixel line; The intensity of the third identification pixel line can be detected.

The data area detection module calculates the sampling data detection pixel intensity by detecting the position of the sampling data detection pixel and the position of the compensation data detection pixel among the balance code detection pixel units, and calculates the intensity of the compensation data detection pixel. The detection pixel having the maximum intensity among the calculated intensities of the sampling data detection pixels may be determined.

The balance code reproducing module reproduces the sampling data detection pixel, and reproduces the balance code after reflecting a predetermined compensation value to the intensity of the compensation data detection pixel.

The data page restoration module may restore the source data page by combining a plurality of balance codes reproduced by the balance code reproduction module.

The overpixel may be performed as 1: n (n is a non-integer greater than 1).

The light receiving area of each detection pixel of the photodetector may be about half of the area of the detection pixel.

The optical information detecting method according to the present invention for achieving the above object is to detect an image of a source data page having an identification section for distinguishing the data area and the data area of the balance code as an overpixel, the detected data page Determining a data detection area corresponding to the data area in the image of the image, selecting a balance code detection pixel unit corresponding to the balance code in the data detection area, and reconstructing the source data page by reproducing the balance code; Equipped.

Determining a sampling data detection pixel and a compensation data detection pixel among the balance code detection pixel units; calculating an intensity of the sampling data detection pixel; calculating an intensity of the compensation data detection pixel; The method may further include reconfiguring the balance code by compensating for intensity.

The identification area that detects the identification portion of the detection data page is a first identification area, a first identification detection pixel line having a largest intensity orthogonal to the first identification area, and a second identification detection having a second intensity. And a second identification region having a pixel line and a third identification detection pixel line in contact with the first identification detection pixel line and positioned at the side of the data detection region.

The sampling data detection pixel may be matched with a pixel of the source data page among the balance code detection pixel units, and the compensation data detection pixel may be in contact with the sampling data detection pixel and mismatched with a pixel of the source data page. .

The method may further include calculating a compensation value for the compensation data detection pixel when the sampling data detection pixel is selected.

The compensation value may be calculated by comparing the intensity of the first identification detection pixel line with the intensity of the third identification detection pixel line and reflecting the largest intensity among the sampling data detection pixels.

The reflection of the compensation value in the compensation data detection pixel may be separately reflected when the adjacent sampling data detection pixel is on and off.

Determining whether the value of the compensation data detection pixel is greater than half of the maximum intensity among the sampling data detection pixels when the sampling data detection pixel adjacent to the compensation data detection pixel is turned on; If the intensity of the compensation data detection pixel is greater than half of the maximum intensity, the compensation value is subtracted from the intensity of the compensation data detection pixel if the intensity of the compensation data detection pixel is less than half of the maximum intensity. It may further comprise a step.

Determining whether the value of the compensation data detection pixel is greater than half of the maximum intensity among the sampling data detection pixels when the sampling data detection pixel adjacent to the compensation data detection pixel is off; Using the intensity of the compensation data detection pixel if it is less than half the maximum intensity, and adding the compensation value to the intensity of the compensation data detection pixel if the intensity of the compensation data detection pixel is greater than half the maximum intensity. It may be further provided.

The overpixel may be performed as 1: n (n is a non-integer greater than 1).

The detection pixel may have a light receiving area of about half of the area of the detection pixel.

Hereinafter, an optical information detecting apparatus and an optical information detecting method according to an embodiment of the present invention configured as described above will be described. In the description of the following embodiments, the names of each component may be referred to by other names in the art. However, if the functional similarity and identity thereof, even if the modified embodiment can be adopted may be equivalent configuration. In addition, the symbols added to each component is described for convenience of description. However, the contents shown in the drawings in which these symbols are described do not limit each component to the ranges in the drawings. Similarly, even if an embodiment in which the configuration on the drawings is partially modified is employed, it can be regarded as an equivalent configuration if there is functional similarity and identity.

1 is a block diagram showing the configuration of an optical information reproducing apparatus including an optical information detecting apparatus according to a preferred embodiment of the present invention.

As shown in FIG. 1, the optical information detecting apparatus includes a light irradiator 10 that generates light such as a laser and irradiates the optical information storage medium 20. The light irradiator 10 enters the irradiated light into the optical information storage medium 20 at a predetermined angle. The optical information storage medium 20 stores a plurality of data pages in the form of interference patterns. In this case, the light incident by the light irradiator 10 may be a reference beam for reproducing the interference pattern stored in the optical information storage medium 20.

When light is incident on an interference pattern stored in the optical information storage medium 20, an image of a data page is reproduced by diffraction by the interference pattern. At this time, the image of the reproduced data page is detected by the optical information detector 100. Subsequently, the image of the detected data page is converted into binary data by the signal processing unit 30, and then decoded by the decoding unit 40 and reproduced as original data.

2 is a block diagram showing the configuration of an optical information detection apparatus according to an embodiment of the present invention.

As shown in FIG. 2, the optical information detector 100 includes a photo detector 110. The photo detector 110 may be a light-receiving pixel array such as a complementary metal-oxide semiconductor (CMOS) or a charge coupled device (CCD). Each detection pixel of this light receiving element pixel array has a light receiving area and other areas. The light receiving area may have an area of approximately 50% of the area of the entire detection pixels. The optical information detector 100 detects an image of a source data page having an identification unit and a data area coded with a balance code in a predetermined pixel unit as an overpixel. An overpixel according to an embodiment of the present invention described below will be described with one embodiment of 1: n (n is a non-integer exceeding 1), and more specifically, 1: 1.5.

The optical information detector 100 includes an optical information processing unit 120. The optical information processing unit 120 determines a data detection area corresponding to the data area in the image of the detected source data page, selects a balance code detection pixel unit corresponding to the balance code in the data detection area, and then reproduces the balance code. Restores the source data page.

The optical information processing unit 120 detects the identification unit detection module 130 for detecting the identification unit of the source data page detected by the photo detector 110 and the data region detection unit for detecting a matching state of the data area using the detected identification unit. A module 140, a balance code reproducing module 150 for reproducing a balance code from the detection pixels detected by the data area detection module 150, and a data page reconstruction module 160 for reconstructing a data page with the reproduced balance code. ).

Specifically, the identification unit detecting module 130 detects an identification unit disposed in a first direction and a second direction orthogonal to the first direction among the detection pixels detected by the photo detector 110, and detects the maximum intensity among the identification units. The intensities of the first identification detection pixel line having the branch, the second identification detection pixel line having the second intensity, and the third identification detection pixel line in contact with the first identification detection pixel and positioned at the data area are detected.

The data area detection module 140 detects the sampling data detection pixel and the compensation data detection pixel in the balance code detection pixel unit to calculate sampling data of the sampling data detection pixel, and then calculates the compensation data of the compensation data detection pixel. . The detection pixel having the maximum intensity among the sampling data detection pixels is determined.

Subsequently, the balance code reproducing module 150 configures a balance code with the detected value of the sampling data detection pixel, and applies the balance code to the compensation data detection pixel by applying a predetermined compensation value to the intensity of each compensation data detection pixel. Configure. The data page restoration module 160 combines the plurality of balance codes reproduced by the balance code reproduction module 150 to restore the source data page.

Hereinafter, an embodiment of an optical information detecting method using the optical information detecting apparatus according to the embodiment of the present invention configured as described above will be described.

The optical information detection method according to the embodiment of the present invention is a case where 1: 1.5 overpixel and a case where the light receiving area of the detection pixel is about half of the area of the detection pixel. However, the overpixel may be another condition, and the area of the detection pixel may be another area.

First, the pixel detection state will be described. 3A is a diagram exemplarily illustrating a case where 1: 1.5 pixel matching is correctly performed in the optical information detecting method according to an embodiment of the present invention, and FIG. 3B is a first embodiment of the optical information detecting method according to an embodiment of the present invention. 1.5 is a diagram illustrating a case where pixel matching is not accurately performed.

First, as shown in FIG. 3A, when the 1: 1.5 overpixel is detected, the photodetector 110 detects the pixel of the 2 ㅧ 2 small tm data page as the 3 ㅧ 3 detection pixel.

In this case, the influence of pixel mismatching will be briefly described first. In the recording process of the optical information, the fill factor of the spatial light modulator representing the data image is 100%. On the other hand, the detection range of the detection pixel of the light-receiving element pixel array which hides the reproduced image is not 100%. Even in order to secure an activation range of about 50%, it should be manufactured in an integration process of 0.13 μm or less.

Therefore, when the pattern of the four source data pixels S1 to S4 reproduced as shown in FIG. 3A is exactly formed on the nine detection pixels C1 to C9, the binary information of "S1" at the time of recording is "C1". It is possible to measure and measure the intensity of. Similarly, "S2", "S3", and "S4" can be understood as the intensity of "C3", "C7", and "C9", respectively.

Here, the intensity value of "C2" is meaningless because it includes data information of "S1" and "S2" together. Similarly, the intensity information of "C4", "C5", "C6", and "C8" is the information of "S1-S3", "S1-S2-S3-S4", "S2-S4", and "S3-S4", respectively. Is a mixed value. As such, in the case of 1: 1.5 oversampling, in the case of perfect matching, sampling of four pixels of the nine pixels of the data image detected by the light receiving element pixel array accurately restores the recorded source data page. Can be.

However, when pixel mismatching occurs as shown in Fig. 3B, the binary information of "S2" can be known from the intensity of "C6", and the binary information of "S4" can be known from the intensity of "C9". .

However, binary information of "S1" and "S3" cannot use direct intensity. Because, as already mentioned, the light receiving area of one detection pixel is about 50% of the area of all detection pixels, and if the height of the detection pixel is about half the length of the detection pixel, "S2" and "S4" There is a matching detection pixel, but "S1" and "S3" do not have a matching detection pixel. Therefore, "S1" and "S3" cannot obtain binary information due to the intensity in the detection pixel at this time. Therefore, in this case, "S1" and "S3" need to find and reflect the compensation value by using information on other adjacent detection pixels to restore the correct data.

Hereinafter, the configuration of the source data page and the detection data page according to an embodiment of the present invention will be described. 4A is a diagram illustrating a configuration of a source data page in the optical information detecting method according to an exemplary embodiment of the present invention, and FIG. 4B is a diagram illustrating a detection data page in which the source data page of FIG. 4A is detected. to be.

As shown in FIG. 4A, the source data page 300 includes an identification unit 310 and a data area 320. The identification unit 310 constitutes a first direction identification frame 311 in a first direction and a horizontal direction on the drawing, and two frames in a direction orthogonal to the first direction, that is, a first identification frame in a second direction ( 312 and a second identification frame 323 in a second direction.

Each of these identification frames 311, 312, 313 consists of "on" pixel lines. In addition, two “off” pixel lines are provided between the first identification frame 312 and the second identification frame 323 in the second direction. In addition, two "off" pixel lines are provided inside the first direction identification frame 311 and the second direction second identification frame 313, and a data area 320 is provided inside the second direction identification frame 311.

The data pixels 331 of the data area 320 are coded with a 6: 8 balance code as binary data. In addition, in order to maintain good Inter Symbol Interference (ISI), coding is performed so that "on" and "off" do not cross in the data pixel 331. The detection data page 200 of the source data page 300 has a form as shown in FIG. 4B.

Hereinafter, a method of detecting light information in the detection state of FIG. 4B will be described. FIG. 5 is a flowchart illustrating an optical information detecting method according to an exemplary embodiment of the present invention, and FIG. 6 is a view illustrating a portion of an area where a source data page is detected by the optical detector in the optical information detecting method according to an exemplary embodiment of the present invention. It is a figure shown.

As shown in FIG. 5, the identification unit detection module 130 first detects the identification unit 310 (S100). The detection of the identification unit 310 calculates an identification detection pixel line having the largest intensity sum in the first direction and the second direction, respectively, as shown in FIG. 6. Then, it can be seen that the first detection region 210 having the largest detection pixel line in the first direction is a frame in the horizontal direction.

The detection pixel line 221 for the first identification having the highest intensity sum in the vertical direction is one longitudinal frame, and the second intensity is detected among the second intensities and the third intensities. This is where pixel lines represent one frame better. Accordingly, the detection pixel line indicating the second intensity is the second detection pixel line 222.

However, this case means that perfect pixel matching is not performed. If perfect pixel matching is done, the sum of intensities detected in the first and second vertical frames will be equal within the margin of error. However, in the case of pixel mismatching, the sum of the intensities of the detection pixel lines having two large intensities is different as described above.

Therefore, in the case of perfect pixel matching, binary information may be acquired according to the matched detection pixel as described above. However, when perfect pixel matching is not performed as shown in FIG. 6, compensation for mismatched data pixels is performed.

The data area detection module 140 determines the data detection area 230 from the lines of the detection pixels. The data area 230 is a corresponding area starting from the detection pixel line in which three detection pixel lines are skipped in an inner direction of the first identification area 210 and the second identification area 220. Then, the data detection region 230 is set in the balance code detection pixel unit 231 corresponding to the 6: 8 balance code in the vertical direction or the horizontal direction (S110).

The sampling data detection pixel 232 and the compensation data detection pixel 233 are discriminated among the balance code detection pixel units 231 (S120). The sampling data detection pixel 232 is a sampling data detection pixel 232 in which the detection pixel line for the frame having the largest intensity value in the horizontal direction is a reference, and the next detection pixel that is in contact therewith is the compensation data detection pixel 233. ) Then, one detection pixel line is skipped, and again, the sampling data detection pixel 232 and the compensation data detection pixel 233 are paired, and again, one detection pixel line is skipped and the sampling data detection pixel 232 and the compensation data are skipped. The detection pixel 233 is set.

The intensity of the sampling data detection pixel 232 and the intensity of the compensation data detection pixel 233 are calculated, and as mentioned above, the sampling data detection pixel 232a having the maximum intensity among the intensity values of the sampling data detection pixel 232. Finding (S200).

Meanwhile, the balance code reproducing module 150 calculates a predetermined compensation value in the intensity of the compensation data detection pixel 233 before reproducing the balance code to reflect the compensation value for the compensation data detection pixel 233 requiring compensation. . However, the reflection of the compensation value does not need to be reflected in all compensation data detection pixels 233. This will be described below.

Detection pixels for binary data are represented in two cases: "on" and "off". Therefore, the sampling data detection pixel 232 and the compensation data detection pixel 233 may be displayed in four cases.

First, when the sampling data detection pixel 232 is "on" and the compensation data detection pixel 233 is "on", second, the sampling data detection pixel 232 is "on" and the compensation data detection pixel 233 ) Is " off ", thirdly, when the sampling data detection pixel 232 is " off ", and the compensation data detection pixel 233 is " on ", the fourth sampling data detection pixel 232 is " off " When the compensation data detection pixel 233 is " off "

In the first and fourth cases, the information of the adjacent data pixels is detected in the compensation data detection pixel 233, but since the two information are the same binary information, the problem of data reproduction even when the value detected in the compensation data detection pixel 233 is used as it is. Does not become.

However, in the second case, the data pixel is actually "off" and should be detected with dark intensity, but since the information of the adjacent sampling data pixel 232 is "on", the adjacent sampling data detection pixel 232 in the compensation data detection pixel 233 is detected. Has a intensity value higher than the intensity to accept some of the light from the " off "

In the third case, the intensity detected by the compensation data detection pixel 233 is " on ", but in part, since the adjacent sampling data pixel 232 is " off " It has a smaller intensity. Therefore, in the second and third cases, the compensation data detection pixel 233 actually needs to be compensated.

The principle of reward is simple. That is, in the second case, when the light of the adjacent sampling data pixel 232 enters the compensation data detection pixel 233, the amount of light may be removed by the amount thereof. In the third case, the light of the adjacent sampling data pixel 232 is reduced. Do as much as you need. Therefore, the following compensation equation is applied.

I (new) = I (C) ㅁ I (Comp)

Here, I (new) is the intensity of which the compensation value is compensated in the compensation data detection pixel 233, I (C) is the intensity of the actually detected compensation data detection pixel 233, and I (Comp) is the compensation value. . This compensation value will be described later.

The data detection area 230 is determined, and it is determined which compensation data detection pixel 233 of the compensation data detection pixel 233 is to be compensated. Therefore, when the compensation data detection pixel 233 in the data detection region 230 is found, the compensation value is calculated, and the intensity is compensated for the compensation data detection pixel 233, the source data is reproduced. The compensation data detection pixel 233 selects a balance coding block in the data region 320.

On the other hand, as already mentioned, in the data area 320 of the optical information storage device, the data is decoded by the balance code 330 for uniform distribution of light. That is, for example, in the case of the 6: 8 balance code 330, six data bits are decoded into eight data pixels 331 including four "on" and four "off" data pixels 331. Accordingly, in the case of 1: 1.5 oversampling, two data pixels 331 are detected as three detection pixels, and one block unit of the balance code 330 becomes 12 balance code detection pixel units 231.

FIG. 7 is a diagram exemplarily illustrating a balance code detection pixel unit of a detection data page for a 6: 8 balanced coded source data page in the optical information detecting method according to an exemplary embodiment of the present invention.

Therefore, as illustrated in FIG. 7, the eight-pixel balance code 330 may find four perfectly matched detection pixels and four mismatched detection pixels in the balance detection pixel unit 231. The matched detection pixel is the sampling data detection pixel 232, and the mismatched detection pixel is the compensation data detection pixel 233. In FIG. 7, the compensation data detection pixel 233 in which compensation is actually performed among the compensation data detection pixels 233 may be third and fourth compensation data in which adjacent sample data pixels are “off”. This is already mentioned in the principle of compensation, so refer to the above-mentioned part.

Meanwhile, the intensity values of the four perfectly matched sampling data detection pixels 232 may be determined as binary information. The sampling data detection pixel 232 having the greatest intensity among them is set as the reference value (6: 8 max). The compensation value may be calculated by using Equation 2 below with reference to the reference value (6: 8 max) (S210).

I (Comp) = I (6: 8 max) x (B / 1st)

Here, "1st" is the intensity sum of the second detection pixel line 221 having the greatest intensity sum in the longitudinal direction with respect to the identification unit 310, and "B" has the greatest intensity sum in this longitudinal direction. It is the sum of the intensities of the third detection pixel lines 223 for identification, which are lines in contact with the detection pixel lines. This compensation value represents an intensity value for a portion not detected by the compensation data detection pixel 233.

Thereafter, the original balance code 330 is reconstructed using the balance code detection pixel 231 (S330). As mentioned above, since the sampling data detection pixel 232 already has a complete detection value, the sampling code detection pixel 232 constitutes the balance code 330 without additional compensation. However, since the compensation data detection pixel 233 requires compensation for configuring the balance code 330, the compensation data detection pixel 233 proceeds with the compensation process.

Intensity compensation for the position of the compensation data detection pixel 233 is first determined whether the adjacent sampling data detection pixel 232 is "on" or "off", and separates when it is "on" and "off". Compensation process (S300).

First, when adjacent sampling data pixels are on, the following result is determined by applying Equation 3 below (S310).

I (C)> I (6: 8 max) / 2

That is, if the intensity of the compensation data detection pixel 233 is greater than half of the reference value (6: 8 max) which is the largest intensity among the balance code detection pixels 231, the corresponding compensation data detection pixel 233 is " on " to be. In operation S311, a binary signal is determined by determining the detected intensity as the compensated intensity.

On the other hand, if the intensity in the compensation data detection pixel 233 is less than half of the reference value (6: 8 max), it means that this intensity is actually "off". Therefore, the balance value 330 is determined by subtracting the compensation value to configure the balance code 330 (S312).

Next, in the case where the adjacent sampling data detection pixel 232 is “off”, Equation 3 described above is applied to determine the result.

If the intensity in the compensation data detection pixel 233 is greater than half of the reference value (6: 8 max), the corresponding compensation data detection pixel 233 is actually "on". Therefore, the compensation code is added to the value to determine the binary signal to configure the balance code 330 (S321). On the other hand, if the intensity in the compensation data detection pixel 233 is less than half of the reference value (6: 8 max), this value is actually "off". Therefore, this value is determined as it is to configure the balance code 330 by determining the binary signal (S322).

Thus, in this way, the configuration of the reproduced balance code 330 for the balance code detection pixel 231 of all the sampling data detection pixels 232 and the compensation data detection pixel 233 is completed (S330). In this way, when all the data areas 320 are reconfigured in units of the balance code 330, the configuration of the data page is completed (S340).

Unlike the above-described embodiment, the sampling data detection pixel is used as it is, and in the process of compensating the data of the compensation data detection pixel, the calculation of the compensation value by each equation may be modified in another manner. In addition, a simpler and faster algorithm may be used in additional processing to restore the reproduced data. However, all other modified embodiments include the essential elements of the present invention should be considered to be included in the technical scope of the present invention.

The optical information detecting apparatus and the optical information detecting method according to the present invention as described above detects the optical information by 1: n (n is a non-integer greater than 1) oversampling, so that the optical information is detected by the conventional 1: 2 or 1: 3 oversampling. Compared to this, the optical information storage density is improved and data compensation due to misalignment between data pixels is more effectively performed, so that the reliability of data detection is further improved, and the data compensation is performed at the detection pixel having a limited light receiving area. Therefore, the data processing speed can be improved, and the optical information detection efficiency, data storage size, and processing capacity can be further improved, compared to the conventional oversampling method.

Claims (19)

An optical detector for over-detecting an image of a source data page having a balance coded data area and an identification unit for distinguishing the data area; In the image of the detection data page detected by the photo detector, a data detection area corresponding to the data area is determined, a balance code detection pixel unit corresponding to the balance code is selected in the data detection area, and then the balance code detection pixel unit is selected. And an optical information processing unit for reproducing the source data page by reproducing the balance code from the data source. 2. The apparatus of claim 1, wherein the optical information processing unit comprises: an identification unit detection module detecting the identification unit, a data area detection module detecting a matching state of the data area using the detected identification unit, and the data area detection module And a balance code reproducing module for reproducing the balance code from the unit of the balance code detection pixel detected at and a source data page reconstruction module for reconstructing the source data page with the reproduced balance code. . The display apparatus of claim 2, wherein the identification module detecting module comprises: a first identification region located in a first direction among the detection pixels detected by the photo detector, and a second identification disposed in a second direction orthogonal to the first identification region; Detect areas, A first detection detection pixel line having a maximum intensity among the second identification areas, a second identification detection pixel line having a second intensity, and a first identification detection pixel line in contact with the data detection area; And detecting the intensity of the third identification pixel line located therein. 3. The compensation data detection pixel of claim 2, wherein the data area detection module calculates the sampling data detection pixel intensity by detecting a position of a sampling data detection pixel and a position of the compensation data detection pixel among the balance code detection pixel units. Compensating the intensity of the compensation data, and the optical information detection apparatus for determining the detection pixel having the maximum intensity among the calculated intensity of the sampling data detection pixel. The optical device as claimed in claim 4, wherein the balance code reproducing module reproduces the sampling data detection pixel, reproduces the balance code after reflecting a predetermined compensation value to the intensity of the compensation data detection pixel. Information detection device. The optical information detection apparatus of claim 2, wherein the data page restoration module restores the source data page by combining a plurality of balance codes reproduced by the balance code reproduction module. The optical information detection apparatus of claim 1, wherein the overpixel is performed by 1: n (n is a non-integer greater than 1). The optical information detection apparatus according to claim 1, wherein the light receiving area of each detection pixel of the photodetector is about half of the area of the detection pixel. Detecting an image of a source data page having an identification unit for distinguishing the data region from a balance code and the data region as an overpixel; In the image of the detected data page, a data detection area corresponding to the data area is determined, a balance code detection pixel unit corresponding to the balance code is selected in the data detection area, and the balance code is reproduced to reproduce the source data page. And reconstructing the optical information detecting method. The method of claim 9, further comprising: determining a sampling data detection pixel and a compensation data detection pixel among the balance code detection pixel units, calculating an intensity of the sampling data detection pixel, and calculating an intensity of the compensation data detection pixel. And compensating for the intensity of the compensation data detection pixel to reconstruct the balance code. 12. The apparatus of claim 10, wherein the identification area detecting the identification part of the detection data page comprises a first identification area, a first identification detection pixel line having a greatest intensity perpendicular to the first identification area, and a second intensity. And a second identification region having a second identification detection pixel line having a second identification detection pixel line and having a third identification detection pixel line positioned at the side of the data detection area. . The pixel of claim 11, wherein the sampling data detection pixel matches a pixel of the source data page among the balance code detection pixel, and the compensation data detection pixel is in contact with the sampling data detection pixel. Optical information detection method characterized in that the mismatch. The optical information detection method of claim 12, further comprising calculating a compensation value for the compensation data detection pixel when the sampling data detection pixel is selected. The method of claim 13, wherein the compensation value is calculated by comparing the intensity of the first identification pixel line with the intensity of the third identification pixel line and reflecting the largest intensity among the sampling data detection pixels. Optical information detection method characterized in that. 15. The method of claim 14, wherein the reflection of the compensation value in the compensation data detection pixel is separately reflected when the adjacent sampling data detection pixel is on and off. 16. The method of claim 15, further comprising: determining whether a value of the compensation data detection pixel is greater than half of the maximum intensity among the sampling data detection pixels when the sampling data detection pixel adjacent to the compensation data detection pixel is on; If the intensity of the compensation data detection pixel is greater than half of the maximum intensity, the intensity of the compensation data detection pixel is used. If the intensity of the compensation data detection pixel is less than half of the maximum intensity, And subtracting said compensation value from intensity. 16. The method of claim 15, further comprising: determining whether the value of the compensation data detection pixel is greater than half of the maximum intensity among the sampling data detection pixels when the sampling data detection pixel adjacent to the compensation data detection pixel is off; If the intensity of the compensation data detection pixel is less than half of the maximum intensity, the intensity of the compensation data detection pixel is used. If the intensity of the compensation data detection pixel is greater than half the maximum intensity, And adding the compensation value to intensity. 10. The method of claim 9, wherein the overpixel is performed by 1: n (n is a non-integer greater than 1). 10. The method of claim 9, wherein the detection pixel has a light receiving area of about half of an area of the detection pixel.

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