CN100414621C - Apparatus and method for compensating for pixel distortion in reproduction of hologram data - Google Patents

Abstract

An apparatus for compensating for pixel distortion while reproducing hologram data includes an extraction unit, a determination and calculation unit, a table, and a compensation unit. The extraction unit extracts a reproduced data image from a reproduced image frame including the reproduced data image and borders. The determination and calculation unit determines position values of edges of the extracted reproduced data image, and calculates average magnification error values of pixels within line data from position values of start and end point pixels thereof, which are based on the determined position values of the edges. The table stores misalignment compensation values for the pixels within the line data, wherein the misalignment compensation values correspond to predetermined references for average magnification error values. The compensation unit compensates for pixel positions in the extracted reproduced data image using the misalignment compensation values that correspond to the calculated average magnification error values.

Description

The device and method of the pixel distortion in the compensation reproduction of hologram data

Technical field

The present invention relates to holophotal system, relate more specifically to compensate from storage medium, read and be used for the device and method of the pixel distortion in the reproduction data image of reconstructing hologram data.

Background technology

Recently, along with development, the research of the technical field of using volume hologram numerical data memory technology is carried out energetically such as semiconductor laser, charge-coupled device (CCD) and LCD (LCD) product.When the fingerprint recognition system that is used to store and reproduce fingerprint has been used as the achievement of this research and when dropping into practical application, research tends to expand to the various fields that can utilize high capacity storage capacity and superelevation data transfer rate.

Holographic stored digital and playback system are a kind of interference figure to be recorded device in the storage medium, interference figure be when from the flashlight of target and reference light interference produce, storage medium for example is anaclasis (photorefractive) liquid crystal that the amplitude of this interference figure is had sensitivity response.Because this storage and playback system are along with reference light angle or suchlike variation and the amplitude and the phase place of tracer signal light beam, therefore it can store hundreds of to thousands of holograms, wherein every one page that hologram all is made up of binary data at same position.

Simultaneously, when the recording mode that hologram data is recorded in the storage medium, typical holographic stored digital and playback system are divided into reference beam and object beam to the laser beam of utilizing light source to generate; Object beam is modulated into pixel wherein forms bright and dark binary-data page according to outer input data (that is the input data that, store); And interference figure recorded in the storage medium as the hologram data corresponding to the input data, wherein this interference figure be by make the object beam modulated and the reference beam that is decomposed and reflects by predetermined deflection angle mutually mutual interference obtain.

Simultaneously, when reproduction mode, from storage medium, read hologram data.And, the hologram data that this reads, promptly reproduce data image and may have the problem of amplifying variation, such as the expansion of reproducing data image or reduce, and pixel misalignment, they are because the surface appearance of the error in the optical system, storage medium or the focusing error that focuses on the object lens that reproduce data image are caused.The typical conventional method that is used for addressing the above problem was a sampling technique.

Fig. 9 is the block scheme that adopts the reconstruction of hologram system of conventional mistake sampling technique.This reconstruction of hologram system comprises Spindle Motor 902, storage medium 904, reads light-path 906, playback light path 908, image-detection component 910, Boundary Detection parts 912 and cross sampled part 914.

With reference to Fig. 9, reconstruction of hologram system is provided with the storage medium 904 with Spindle Motor 902 rotations.And storage medium 904 is provided with and reads light-path 906, and the required light that reads of hologram data that reproduces record shines on the storage medium 904 along this path; And the data image light beam (that is, the criss-cross pattern of binary data) that reproduces by the irradiation of reading light is along 908 outputs of playback light path, and wherein playback light path 908 comprises object lens that are used for the focus data image light.

In addition, image-detection component 910 is set, such as ccd video camera on the end of playback light path 908.Ccd video camera is according to the mode of crossing sampling each pixel wherein, become n * n pixel (for example 3 * 3 pixels) with photovoltaic reproducing the data image Beam Transformation, and transformation result is offered Boundary Detection parts 912.In this case, from storage medium 904 reading of data image light, promptly the reproduced image frame comprises data image district and frontier district.For example, if suppose this reproduced image frame have 240 * 240 sizes resolution the reproduction data image and have the border, upper and lower, left and right of 3 pixel sizes, then image-detection component 910 generates the reproduced image frame of light-to-current inversion, it comprises the border and has the resolution of 1024 * 1024 sizes, and the reproduced image frame of this light-to-current inversion is offered Boundary Detection parts 912.

After this, Boundary Detection parts 912 usefulness are for example come the detection boundaries district with reference to the method with respect to the pixel total brightness of every row of the reproduced image frame of institute's conversion; The information on the border that goes out based on related detection to extract the reproduction data image of sampling from the reproduced image frame; And a sampling reproduction data image of crossing that extracts sent sampled part 914 to.For example, if use a pixel is transformed into 3 * 3 pixels and obtains to have for example reproduced image frame of 1024 * 1024 sizes from the reproduction data image on the border, upper and lower, left and right of resolution with 240 * 240 sizes and 3 pixel sizes, then Boundary Detection parts 912 sampling of crossing of extracting the resolution with 720 * 720 sizes is reproduced data image and it was sent to sampled part 914.

And, cross sampled part 914 and cross the original reproduction data image of extraction the sampling reproduction data image from this by the sampling of using 3 * 3 masks.That is to say, for example, cross raw data image that sampled part 914 extracts the resolution with 240 * 240 sizes in such a manner (promptly, coded data images), promptly extract a pixel, skip two pixels (that is, extracting the method for center pixel from each 3 * 3 mask) from the mistake sampled data image of resolution then, as shown in figure 10 with 720 * 720 sizes.The raw data image that extracts is as mentioned above offered the decoding of demoder (not shown).In Figure 10, n1 to n4 represents 3 * 3 mask zones of along continuous straight runs.

In this case, when the size that has served as the sampled data image for example increases owing to the distortion that is attributable to various external factor, for example when the data image of the resolution that should have 720 * 720 sizes has the resolution of 722 * 722 sizes, cross sampled part 914 whole data segment (for example data line) is divided into three equal parts along each level and vertical direction, and carry out in such a manner and take a sample, promptly in the starting position of second and the 3rd moiety, replace two pixels and skip three pixels (that is five equilibrium compensation method).

Yet, adopted sampling technique so that prevent owing to the surface appearance of the error in the optical system, storage medium and there is such problem in the conventional method that is used for focusing on the reproduction data image distortion (distortion) that the focusing error of the object lens that reproduce data image occurs, promptly CCD must be designed to big than needs.This problem becomes the factor of the reconstruction of hologram system that stops little, the small-sized and low price of weight.

In addition, adopted the conventional method of sampling technique must handle unnecessary large-scale reproduction data image, thereby caused the problem of data reproduction speed aspect.

And, in conventional method, when the resolution sizes of reproducing data image becomes resolution sizes than real data when big, compensation pixel distortion in such a way, promptly data line is divided into equal part, its number equals (pixel count of increase+1), and discards a pixel in addition on each starting point of these moieties.In this case, consider that the probability that the boundary coordinate of data image drops on the round values fully is very low, therefore the problem that distortion can not correctly be compensated can occur, so that this problem makes and is difficult to realize high-quality reproduced image.

Simultaneously, hologram data, promptly the reproduction data image from storage medium reproducing can demonstrate a kind of phenomenon, wherein owing to the grid error of the lens errors (promptly by the level of lens and the error that difference caused of the refractive index on the vertical direction) of optical system, hologram data, the error that is attributable to the horizontal fault of storage media disk or the like cause the distortion of entire image linear/non-linear.Yet, adopted the conventional method of sampling technique not consider the linear/non-linear distortion of the entire image that causes by above-mentioned various factors.In this conventional method, carried out sampling, at this moment with upper left quarter, promptly first pixel of first of the data image row is considered as the reference position, and first pixel of other every row is assumed to this reference position aims at.Therefore, when the linear/non-linear distortion of image is serious, produce such problem, the position of promptly passing through the object pixel of sampling extraction can be offset, and this problem becomes the factor that reduces the reproduced image quality.

Summary of the invention

Therefore, fundamental purpose of the present invention provides a kind of device and method that compensates the reproduction pixel distortion of hologram data, it can use pixel matching compensation method in 1: 1 to compensate magnification distortion based on pixel, and this pixel matching compensation method in 1: 1 is in the mismatch that image fault is reduced to pixel mismatch post-compensation pixel.

Another object of the present invention provides a kind of device and method that compensates the reproduction pixel distortion of hologram data, a plurality of alignment marks that its use is inserted in some precalculated positions of picture frame are divided into a plurality of subimage blocks to data image, use pixel matching compensation method in 1: 1 according to pixels to compensate the magnification distortion and the linear/non-linear distortion of entire image in the unit, this pixel matching compensation method in 1: 1 is in the pixel mismatch that image fault is reduced to the subimage block that pixel mismatch post-compensation divided.

Preferred embodiment according to one aspect of the invention, a kind of device of compensation pixel distortion when the reconstructing hologram data is provided, this hologram data is recorded in the storage medium, as by reference light with carry out the interference figure that the modulated signal light interference obtains according to these data, this device comprises: be used for extracting the unit that reproduces data image from containing the reproduced image frame that reproduces data image and border; Be used to determine the positional value at each edge of reproduction data image of extracting, and calculate the unit of the average fault in enlargement value of outlet data interior pixel by its starting point and terminal point locations of pixels value, starting point and terminal point locations of pixels value are based on the positional value at determined each edge; The form that is used for the misalignment offset of each pixel in the storage line data, wherein said misalignment offset is corresponding to several predetermined benchmark of average fault in enlargement value; And be used to use the unit that compensates the location of pixels in the reproduction data image that is extracted corresponding to the misalignment offset of the average fault in enlargement value that calculates.

Another preferred embodiment according to this aspect of the present invention, a kind of device of compensation pixel distortion when the reconstructing hologram data is provided, this hologram data is recorded in the storage medium, as by reference light with carry out the interference figure that the modulated signal light interference obtains according to these data, this device comprises: be used for extracting the unit that reproduces data image and be inserted into several alignment marks in several precalculated positions from containing the reproduced image frame that reproduces data image and border; Be used to use the alignment mark that extracts to detect to reproduce the degrees of misalignment of data image interior pixel and calculate the unit of misalignment corrected value according to testing result; Be used for proofreading and correct location of pixels, and the unit of the positional value at each edge of this reproduction data image of being corrected of definite its location of pixels of this reproductions data image according to the misalignment corrected value that calculates; Be used for determining the unit of the starting point and the terminal point locations of pixels value of line data according to the positional value at determined each edge; Be used for coming the unit of the average fault in enlargement value of calculating pixel according to determined starting point and terminal point locations of pixels value; The form that is used for the misalignment offset of each pixel in the storage line data, wherein said misalignment offset is corresponding to several predetermined benchmark of average fault in enlargement value; And be used to use the unit that compensates the location of pixels in the reproduction data image that is extracted corresponding to the misalignment offset of the average fault in enlargement value that calculates.

Another preferred embodiment according to this aspect of the present invention, a kind of device of compensation pixel distortion when the reconstructing hologram data is provided, this hologram data is recorded in the storage medium, as by reference light with carry out the interference figure that the modulated signal light interference obtains according to these data, this device comprises: be used for from containing the unit that the reproduced image frame that reproduces data image, several borders and a plurality of alignment marks extracts the reproduction data image and is inserted into a plurality of alignment marks in several precalculated positions; Be used for according to the next unit that the reproduction data image that is extracted is divided into a plurality of subimage blocks of these a plurality of alignment marks that extract; Be used for determining the positional value at each each edge of subimage block, and the unit that calculates the average fault in enlargement value of corresponding subimage block interior pixel by the starting point and the terminal point locations of pixels value of line data, described starting point and terminal point locations of pixels value are based on the positional value at determined each edge; The form that is used for the misalignment offset of each pixel in the storage line data, wherein said misalignment offset is corresponding to several predetermined benchmark of average fault in enlargement value; And be used to use the unit that compensates corresponding location of pixels in the corresponding subimage block corresponding to the misalignment offset of the average fault in enlargement value that calculates.

Preferred embodiment according to another aspect of the present invention, a kind of method of compensation pixel distortion when the reconstructing hologram data is provided, this hologram data is recorded in the storage medium, as by reference light with carry out the interference figure that the modulated signal light interference obtains according to these data, the method comprising the steps of: extract and reproduce data image from containing the reproduced image frame that reproduces data image and border; Determine the positional value on each limit of reproduction data image of extracting; Determine the starting point and the terminal point locations of pixels value of line data according to the positional value at determined each edge; Average fault in enlargement value according to determined starting point and terminal point locations of pixels value calculating line data interior pixel; Use compensates location of pixels in the reproduction data image that is extracted corresponding to the predetermined misalignment offset of the pixel of the average fault in enlargement value that calculates.

Another preferred embodiment according to another aspect of the present invention, a kind of method of compensation pixel distortion when the reconstructing hologram data is provided, this hologram data is recorded in the storage medium, as by reference light with carry out the interference figure that the modulated signal light interference obtains according to these data, the method comprising the steps of: extract and reproduce data image and be inserted into several alignment marks in several precalculated positions from containing the reproduced image frame that reproduces data image and border; The alignment mark that use extracts detects the degrees of misalignment of reproducing the data image interior pixel, and calculates the misalignment corrected value according to testing result; Proofread and correct the location of pixels of this reproduction data image according to the misalignment corrected value that calculates, determine the positional value at each edge of this reproduction data image that its location of pixels is corrected, and starting point and the terminal point locations of pixels value of determining the line data according to the positional value at determined each edge; The average fault in enlargement value of coming calculating pixel according to determined starting point and terminal point locations of pixels value; Use compensates location of pixels in the reproduction data image that is extracted corresponding to the predetermined misalignment offset of the pixel of the average fault in enlargement value that calculates.

Another preferred embodiment according to another aspect of the present invention, a kind of method of compensation pixel distortion when the reconstructing hologram data is provided, this hologram data is recorded in the storage medium, as by reference light with carry out the interference figure that the modulated signal light interference obtains according to these data, the method comprising the steps of: extract the reproduction data image and be inserted into a plurality of alignment marks in several precalculated positions from containing the reproduced image frame that reproduces data image, several borders and a plurality of alignment marks; According to these a plurality of alignment marks that extract the reproduction data image that is extracted is divided into a plurality of subimage blocks; Determine the positional value at each each edge of subimage block; Determine the starting point and the terminal point locations of pixels value of line data according to the positional value at determined each edge; Calculate the average fault in enlargement value of corresponding subimage block interior pixel according to determined starting point and terminal point locations of pixels value; And use predetermined misalignment offset corresponding to the pixel of the average fault in enlargement value that calculates to compensate location of pixels in the described subimage block.

Brief description of drawings

In the explanation by the preferred embodiment that provides below in conjunction with accompanying drawing, will be easier to understand above-mentioned and other purpose and characteristics of the present invention, wherein:

Fig. 1 provides the block scheme of employing according to the reconstruction of hologram system of the device of the pixel distortion in the compensation reproduction of hologram data of first preferred embodiment of the invention;

Fig. 2 explanation has the example of the reproduced image frame of data image district and frontier district;

Fig. 3 represents an example scenario of alignment mark pixel and CCD pixel misalignment;

Fig. 4 provides the example of the reproduction data image that extracts from the reproduced image frame;

Fig. 5 A provides the example that the pixel fault in enlargement takes place, and wherein the misalignment accumulation increases when occurring enlarging error in reproduced image;

Fig. 5 B has described when pixel fault in enlargement value accumulation increases, the situation synoptic diagram that wherein several data separations is cut and determine compensation direction with respect to the reference position and the center of pixel;

Fig. 6 provides the block scheme of employing according to the reconstruction of hologram system of the device of the pixel distortion in the compensation reproduction of hologram data of second preferred embodiment of the invention;

Fig. 7 explanation contains the ideal diagram picture frame of data image district, frontier district and a plurality of alignment marks;

Fig. 8 is illustrated in an illustrative example that occurs nonlinear distortion in the reproduced image frame;

Fig. 9 provides and adopts the conventional block scheme of crossing the reconstruction of hologram system of sampling technique; And

Figure 10 has described the reproduction data image of crossing sampling, crosses the processing that original reproduction data image is extracted in sampling in order to explain according to conventional method by 3 * 3.

Embodiment

Hereinafter with reference to accompanying drawing, describe the present invention in conjunction with the preferred embodiments in detail.

Conventional method is divided into the part that several equate to a data image, and its number equals the number of distortion pixel, and according to pixels distortion compensation is carried out in the unit.In contrast, core technology spirit of the present invention is to find the positional value (with respect to the pixel starting point and the final position of data between line data and line) at the edge, four limits that reproduces data image, use the positional value at edge, four limits to calculate the average fault in enlargement value of respective pixel, and the respective pixel position of compensation reproduction data image, these positions utilize the misalignment offset corresponding to the respective pixel of the mean value that calculates to extract.

Another core technology spirit of the present invention is to use a plurality of alignment marks to come to be divided into a plurality of subimage blocks reproducing data image, when writing down, these alignment marks are inserted and are recorded in several presumptive areas of reproduced image frame, find the positional value (with respect to the pixel starting point and the final position of data between line data and line) at the edge, four limits of the subimage block of being divided, use the positional value at edge, four limits to calculate the average fault in enlargement value of the respective pixel in the subimage block, and use the respective pixel position that compensates subimage block (reproduction subimage block) corresponding to the misalignment offset of the respective pixel of the mean value that calculates.

In addition, the present invention further comprises the technical spirit of the location of pixels of compensation reproduction data image or subimage block, its mode makes according to the average fault in enlargement value that calculates, the subimage block zone of reproducing data image zone or each division is divided into the zone of some, and uses compensation direction thereon.

In addition, the present invention further comprises such technical spirit, promptly use several alignment marks that extract from the reproduced image frame to detect the degrees of misalignment of reproducing the data image interior pixel, calculate the misalignment corrected value according to testing result, reproduce the location of pixels of data image according to the misalignment corrected value compensation that calculates, and determine that the location of pixels of this reproduction data image is corrected with respect to the starting point and the terminal point locations of pixels value of the line data of reproducing data image.

Describe first preferred embodiment of the present invention below with reference to accompanying drawings in detail.

Fig. 1 is the block scheme that adopts according to the typical reconstruction of hologram system of the device of the pixel distortion in the compensation reproduction of hologram data of first preferred embodiment of the invention.

With reference to Fig. 1, this reconstruction of hologram system comprises Spindle Motor 102, storage medium 104, reads light-path 106, playback light path 108, image-detection component 110 and reproduce pixel compensation parts 112.In this example, reproduce the reproduction pixel compensation device that pixel compensation parts 112 refer to according to this preferred embodiment.That is to say that the reproduction pixel compensation device of this preferred embodiment comprises that border/alignment mark detection parts 1121, misalignment correction value calculation part 1122, location of pixels determine that parts 1123, pixel fault in enlargement value calculating unit 1124, pixel compensation direction determine parts 1125, pixel compensation parts 1126 and look-up table 1127.

That is to say that employing comprises the storage medium 104 that is rotated by Spindle Motor 102 according to the reconstruction of hologram system of the reproduction pixel compensation device of this preferred embodiment.Storage medium 104 is provided with and reads light-path 106 and playback light path 108, reproducing the required light that reads of the hologram data of record reads light-path along this and is irradiated on the storage medium 104, export along this playback light path 108 by the data image light (that is the criss-cross pattern of binary data) that the irradiation of reading light is reproduced.

In addition, the image-detection component 110 of setting such as ccd video camera on playback light path 108.Ccd video camera generates the reproduced image frame that carries out light-to-current inversion with 1: 1 pixel matching method, and a picture frame that generates sent to the border/alignment mark detection parts 1121 that reproduce in the pixel compensation parts 112, and should each pixel that constitute this reproduced image light be expressed as n * n pixel (for example 3 * 3 pixels) and export represented data routine reconstruction of hologram system.For example, if data image light has the resolution of 240 * 240 sizes and the border, upper and lower, left and right of 3 bits, then image-detection component 110 generates a reproduction picture frame, and this reproduced image frame comprises the reproduction data image of one 240 * 240 size and the border, upper and lower, left and right of 3 pixels.

Simultaneously, the pixel total brightness with respect to every row of this reproduced image frame is for example used on border/alignment mark detection parts 1121, detects the border of reproducing data image; Extract from the reproduced image frame according to the information on relevant detected border and to reproduce data image; Then the reproduction data image that extracts is offered location of pixels by circuit L11 and determine parts 1123 and pixel compensation parts 1126.In addition, border/alignment mark detection parts 1121 (for example are extracted in the reproduced image frame on several precalculated positions, several precalculated positions in the fringe region between frontier district and reproduction data image district, or several precalculated positions in the frontier district, or the like) several alignment marks of forming, then the alignment mark that extracts is offered misalignment correction value calculation part 1122.

In other words, for example, as shown in Figure 2, comprise marginarium 204, reproduction data image district 206 and several alignment marks 204a between frontier district 202, frontier district 202 and the reproduction data image district if suppose the reproduced image frame, then border/alignment mark detection parts 1121 extract the reproduction data image from reproducing data image district 206, and a data image that extracts is provided on the circuit L11.For example, border/alignment mark detection parts 1121 extract the pixel that is inserted into the alignment mark 204a in the marginarium 204, and the pixel of extracting are offered misalignment correction value calculation part 1122.In this case, each alignment mark 204a can both have for example 4 * 4 block size shape, wherein opens/close sub-piece arranged alternate for 2 * 2, as shown in Figure 3.

Misalignment correction value calculation part 1122 determines whether to exist mismatch by 4 * 4 alignment mark pixels and CCD pixel are complementary.For example, as shown in Figure 3, if having mismatch between alignment mark pixel and CCD pixel, then misalignment correction value calculation part 1122 is used the misalignment corrected value that calculates x direction and y direction about the information of closing pixel or opening near the light quantity the pixel of pixel.Among Fig. 3, reference number 302 indication CCD pixels.

For example, if suppose 4 * 4 alignment mark pixels and CCD pixel mismatch, as shown in Figure 3, then can use two 2 * 2 of being positioned on the alignment mark 204a inner opposite angle line direction to close sub-block of pixels or two 2 * 2 and open the misalignment corrected value that sub-block of pixels is calculated x direction and y direction.For example, can use and close the misalignment corrected value that sub-block of pixels is calculated x direction and y direction for two 2 * 2.

That is to say, the supercentral light value that closes pixel that is positioned at Fig. 3 upper left with go up the light quantity summation that detects at pixel x1L (being positioned at the left side that this closes pixel) and pixel x1R (being positioned at the right side that this closes pixel) and equate, and equate with the light quantity summation of detection on pixel y1L (being positioned at the below that this closes pixel) and pixel y1U (being positioned at the top that this closes pixel).Therefore, obtain X1 by using following equation 1 and 2 respectively, the ratio of x1L and x1R, and Y1, y1L and y1U ratio just can use to be positioned at 2 * 2 of upper left and to close the misalignment that sub-block of pixels calculates x direction and y direction.

$X1=(\frac{x1L}{x1L+x1R},\frac{x1R}{x1L+x1R})$

Equation 1

$Y1=(\frac{y1L}{y1L+y1U},\frac{y1U}{y1L+y1U})$

Equation 2

Here, the degrees of misalignment on the x direction when ratio x1L is illustrated in the misalignment of hypothesis the right, and the degrees of misalignment on the x direction of ratio x1R when being illustrated in the misalignment of the hypothesis left side.In addition, the degrees of misalignment on the y direction when ratio y 1L is illustrated in the misalignment of hypothesis top, and the degrees of misalignment on the y direction of ratio y 1U when being illustrated in the misalignment of hypothesis below.Therefore, can be according to for example, the rule of selecting to have less out-of-alignment ratio is determined each X1 and Y1.

In a comparable manner, the supercentral light value that closes pixel that is positioned at Fig. 3 lower right-most portion with go up the light quantity summation that detects at pixel x2L (being positioned at the left side that this closes pixel) and pixel x2R (being positioned at the right side that this closes pixel) and equate, and equate with the light quantity summation of detection on pixel y2L (being positioned at the below that this closes pixel) and pixel y2U (being positioned at the top that this closes pixel).Therefore, obtain X2 by using following equation 3 and 4, x2L and x2R ratio, and Y2, y2L and y2U ratio just can use to be positioned at 2 * 2 of lower right-most portion and to close the misalignment that sub-block of pixels calculates x direction and y direction.

$X2=(\frac{x2L}{x2L+x2R},\frac{x2R}{x2L+x2R})$

Equation 3

$Y2=(\frac{y2L}{y2L+y2U},\frac{y2U}{y2L+y2U})$

Equation 4

Here, the degrees of misalignment on the x direction when ratio x2L is illustrated in the misalignment of hypothesis the right, and the degrees of misalignment on the x direction of ratio x2R when being illustrated in the misalignment of the hypothesis left side.In addition, the degrees of misalignment on the y direction when ratio y 2L is illustrated in the misalignment of hypothesis top, and the degrees of misalignment on the y direction of ratio y 2U when being illustrated in the misalignment of hypothesis below.

After this, by obtaining X1 and the mean value of X2 and the mean value of Y1 and Y2, can detect the misalignment (mismatch) of x direction and y direction.Can calculate the misalignment corrected value according to these testing results.The misalignment corrected value that calculates is transmitted to location of pixels by circuit L12 and determines parts 1123.

Meanwhile, detect although be described as using 2 * 2 in 4 * 4 alignment mark pixels to close sub-block of pixels the misalignment of pixel in this preferred embodiment, the present invention is not limited to this.For example, also can use 2 * 2 in 4 * 4 alignment mark pixels to open sub-block of pixels.In this case, can obtain and close the following result who obtains to come to the same thing of pixel situation.

After this, according to the misalignment corrected value that provides by circuit L12 (being x direction and y direction misalignment corrected value), location of pixels determine parts 1123 proofread and correct the location of pixels of the reproduction data image that provides by circuit L11 (that is, a left side/right and/or on/below the pixel that moves up); Determine the starting point locations of pixels value and the terminal point locations of pixels value of the line data of the reproduction data image that is corrected with respect to its location of pixels; Then the positional value of determining is sent to pixel fault in enlargement value calculating unit 1124.For example, as shown in Figure 4, determine the positional value at the edge of this reproduction data image.Just, determine that x_1 and x_3 are the starting point locations of pixels values on the x directional ray data, x_2 and x_4 are the terminal point locations of pixels values on the x directional ray data; And definite y_1 and y_2 be the starting point locations of pixels value on the y directional ray data, and y_3 and y_4 are the terminal point locations of pixels values on the y directional ray data.In this case, if in reproducing data image, do not occur distortion as yet, then satisfy the condition of x_1=x_3 and x_2=x_4, and satisfy the condition of y_1=y_2 and y_3=y_4.

Positional value according to the edge, promptly determine starting point and the terminal point locations of pixels value that parts 1123 receive from location of pixels, be starting point and terminal point location of pixels value, pixel fault in enlargement value calculating unit 1124 calculates x direction fault in enlargement value X_mag_error and y direction fault in enlargement value Y_mag_error, shown in following respectively equation 5 and 6.

X_mag_error=(x_2-x_1)-X_data_size equation 5

Y_mag_error=(y_3-y_1)-Y_data_size equation 6

After this, calculate the degrees of misalignment Δ x of each pixel x direction and the degrees of misalignment Δ y of each pixel y direction, calculate the average fault in enlargement value of each pixel by using following equation 7 and 8 respectively.The average fault in enlargement value of each pixel that calculates is sent to pixel compensation parts 1126 by circuit L13.

Δ x=X_mag_error/X_data_size equation 7

Δ y=Y_mag_error/Y_data_size equation 8

In equation 5 to 8, X_data_size is the real data size on the x direction, x_1 is the starting point locations of pixels value on the x direction, x_2 is the terminal point locations of pixels value on the x direction, Y_data_size is the real data size on the y direction, y_1 is the starting point locations of pixels value on the y direction, and y_3 is the terminal point locations of pixels value on the y direction.

For example, if x_1 is 0.4 pixel, x_2 is 101.3 pixels, and X_data_size is 100 pixels, and then Δ x is 0.9 pixel/100=0.009 pixel.That is to say that the average fault in enlargement value of each pixel on the x direction (being the misalignment value) is 0.009 pixel.

After this, according to the average fault in enlargement value of every pixel (being the misalignment value) that receives from pixel fault in enlargement value calculating unit 1124, the pixel compensation direction determines that parts 1125 are divided into reproduction data image zone in the district of predetermined number.In detail, cumulative rises misalignment value (for example, Δ x, 2 Δ x, 3 Δ x ..., shown in Fig. 5 A) generate compensation direction and determine signal, this signal makes that compensation direction is inequality according to the zone of being divided (data field), then the compensation direction that generates is determined that signal offers pixel compensation parts 1126 by circuit L14.

That is to say that the point (position) that becomes 0.5 (half-pix) or 0 by the fraction part of determining wherein misalignment value accumulated value comes the dividing data image-region.For example, as mentioned above, if supposing x_1 is 0.4 pixel, Δ x is 0.009 pixel, that point (position) that the fraction part of then misalignment value accumulated value becomes greater than 0.5 pixel is the smallest positive integral n_1 that satisfies equation 0.4+n_1* Δ x＞0.5, thereby n_1 becomes the smallest positive integral greater than (0.5-0.4)/Δ x, promptly 12 (11.1111).In addition, it is the smallest positive integral n_2 that satisfies equation 0.4+n_2* Δ x＞1.0 that the fraction part of misalignment value accumulated value becomes that point (position) of 0, thereby n_2 becomes the smallest positive integral greater than 1.0-0.4/ Δ x, promptly 67 (66.6666).In addition, that point (position) that the fraction part of misalignment value accumulated value becomes once more greater than 0.5 is the smallest positive integral n_3 that satisfies equation 0.4+n_3* Δ x＞1.5, thereby n_3 becomes the smallest positive integral greater than 1.5-0.4/ Δ x, promptly 123 (123.2222).But, because the size of data image is 100 pixels, so n_3 is left in the basket and disregards.

Therefore, consider above-mentioned default, the pixel compensation direction determine parts 1125 image area be divided into a data field from 11 pixels of the 1st pixel to the, from data field of 66 pixels of the 12nd pixel to the and from a data field of 100 pixels of the 67th pixel to the.The data field that marks off has the optionally compensation direction that different compensation directions are arranged respectively, shown in Fig. 5 B.That is to say, has the compensation direction of representing with arrow A from the data field of 11 pixels of the 1st pixel to the, has the compensation direction of representing with arrow B from the data field of 66 pixels of the 12nd pixel to the, have the compensation direction of representing with arrow C from the data field of 100 pixels of the 67th pixel to the, this direction is identical with the direction of representing with arrow A.

After this, when receiving the average fault in enlargement value of every pixel by circuit L13, pixel compensation parts 1126 search look-up tables 1127, thus determine corresponding benchmark among a plurality of predetermined benchmark for average fault in enlargement value; And use misalignment offset corresponding to the pixel of the benchmark of average fault in enlargement value, to the pixel executing location compensation of the reproduction data image that provides by circuit L11.For this reason, a plurality of predetermined benchmark of the average fault in enlargement value of look-up table 1127 storage, and corresponding to the misalignment offset of the pixel of each benchmark of average fault in enlargement value.

Therefore, according to the present invention, can realize the reproduction of hologram data, this reproduction can use 1: 1 pixel matching method to compensate the reduction that suppresses image quality by every locations of pixels, even need not use sampling technique.

Hereinafter describe second preferred embodiment of the present invention with reference to the accompanying drawings in detail.In this preferred embodiment, indicate those and the first preferred embodiment components identical with identical reference number, and omit its explanation.

Fig. 6 is the block scheme of reconstruction of hologram system, and this system adopts the device according to the pixel distortion in the compensation reproduction of hologram data of second preferred embodiment of the invention.

With reference to Fig. 6, this reconstruction of hologram system comprises Spindle Motor 102, storage medium 104, reads light-path 106, playback light path 108, image-detection component 110 and reproduce pixel compensation parts 612.In this example, reproduce the reproduction pixel compensation device that pixel compensation parts 612 refer to according to this preferred embodiment.The reproduction pixel compensation device of this preferred embodiment comprises that border/alignment mark detection parts 6121, sub-piece generate parts 6122, misalignment correction value calculation part 1122, location of pixels and determine that parts 1123, pixel fault in enlargement value calculating unit 1124, pixel compensation direction determine parts 1125, pixel compensation parts 1126 and look-up table 1127.

That is to say, adopt the reconstruction of hologram system of the reproduction pixel compensation device of this preferred embodiment to be provided with the storage medium 104 that rotates by Spindle Motor 102.And, storage medium 104 disposes and reads light-path 106 and playback light path 108, reproducing the required light that reads of the hologram data of record reads light-path along this and shines on the storage medium 104, export along this playback light path by the data image light (that is the criss-cross pattern of binary data) that the irradiation of reading light is reproduced.

In addition, the image-detection component 110 of setting such as ccd video camera on playback light path 108.Ccd video camera generates the reproduced image frame that carries out light-to-current inversion with 1: 1 pixel matching method, and a picture frame that generates sends the border/alignment mark detection parts 6121 that reproduce in the pixel compensation parts 612 to, and should routine reconstruction of hologram system be expressed as n * n pixel (for example 3 * 3 pixels) to each pixel of this reproduced image light, and export this data.For example, when data image light has the border, upper and lower, left and right of the resolution of 240 * 240 sizes and 3 bits, playback light path 108 generates one and reproduces picture frame, and this reproduced image frame comprises the reproduction data image of one 240 * 240 size and the border, upper and lower, left and right of 3 pixels.

After this, the pixel total brightness with respect to every row of this reproduced image frame is for example used on border/alignment mark detection parts 6121, detects the border of reproducing data image; Detection is inserted into a plurality of alignment marks in the marginarium between the frontier district and image for example; And, extract from the reproduced image frame and to reproduce data image according to the information on relevant detected border.In this example, alignment mark is provided at predetermined intervals along four limits in data image district.The reason of doing like this is in order to be divided into a plurality of subimage blocks with pre-sizing according to alignment mark reproducing data image, so that might not only compensate the misalignment of the linear distortion of the fault in enlargement that is attributable to pixel and entire image, but also compensate the nonlinear distortion of entire image by the linear distortion that nonlinear distortion is approximately subimage block.

That is to say, as shown in Figure 7, when recording hologram data on the storage medium, can be inserted in the fringe region 704 between frontier district 702 and the data image district 706 by a plurality of alignment mark AM1 to AM12 of predetermined space setting.Border/alignment mark detection parts 6121 extract a plurality of alignment mark AM1 to AM12 and reproduce data image, and they are offered sub-piece generation parts 6122.Among Fig. 7, reference marker SB1 to SB9 refers to subimage block, constitutes respectively according to alignment mark AM1 to AM12 and with them to have unified size (or different size).To describe these subimage blocks SB1 to SB9 after a while in detail.

After this, sub-piece generates parts 6122 according to a plurality of alignment mark AM1 to AM12 that extract from the fringe region 704 between border and the image, data image is divided into the subimage block of several pre-sizings.For example, as shown in Figure 7,, then the data image that extracts from rendering frame is divided into 9 number of sub images piece SB1 to SB9 if hypothesis press fringe region 704 between predetermined space insertion border and the image to 12 alignment mark AM1 to AM12.For example, all have 4 * 4 size, then come the partition data image, can be divided into the experimental process image block to this data image by central point with respect to each alignment mark if suppose each alignment mark.Although described the situation that data image is divided into 9 number of sub images pieces as an example, the present invention is not limited to this.That is to say, a large amount of alignment marks are inserted in the frame, just can be divided into a large amount of subimage blocks to data image by interval (or irregular spacing) when writing down alignment mark by rule.

If suppose not occur as yet the linear/non-linear distortion of entire image in rendering frame, then this rendering frame can have shape as shown in Figure 7.Yet, because the linear/non-linear distortion may appear in the above factor of partly describing in background technology of the present invention.As an example, nonlinear distortion may appear in entire image, as shown in Figure 8, and wherein for example, each limit that connects the summit is non-linearly bent to a rendering frame (representing with reference character " a " and " b "), and each vertex position of this rendering frame is kept intact simultaneously.

Therefore, if the linear/non-linear distortion, then " b " district will become to data image should exist, but an in fact non-existent district.If after the linear/non-linear distortion occurring, use conventional mistake sampling technique to extract data image, such phenomenon may appear so, and promptly pixel is that extract in the zone (i.e. " b " district) that never has the real data image.

In the present invention, be moved in view of pixel and pixel distortion in the compensated linear distortion.Simultaneously, when the linear/non-linear distortion occurring in entire image, alignment mark suffers and data image linear/non-linear distortion much at one.In addition, in the present invention, can be approximated to nonlinear distortion the linear distortion of subimage block, and use 1: 1 matching process to come from the subimage block that forms according to alignment mark, to extract data pixels.Therefore, can prevent the nonlinear distortion situation and the linear distortion situation of (i.e. " b " district) extraction data pixels from non-existent that district of data image.

After this, sub-piece generates parts 6122 and the subimage block SB1 to SB9 that use a plurality of alignment mark AM1 to AM12 and obtain are offered location of pixels by circuit L11 by continuation mode (promptly from SB1 to SB9) determines parts 1123 and pixel compensation parts 1126.In addition, sub-piece generate parts 6122 on the precalculated position of reproduced image frame (for example, frontier district and reproduce several precalculated positions in the marginarium between the data image district, or several precalculated positions in the frontier district) alignment mark of extraction offers misalignment correction value calculation part 1122.For example, alignment mark is provided in such a manner, promptly when subimage block SB1 is placed on the circuit L11, alignment mark AM1, AM2 and AM12 are optionally offered misalignment correction value calculation part 1122, and when being placed on the circuit L11, alignment mark AM1, AM2, AM3 and AM12 are optionally offered misalignment correction value calculation part 1122 as subimage block SB2.

Then, misalignment correction value calculation part 1122, location of pixels determine parts 1123, pixel fault in enlargement value calculating unit 1124, pixel compensation direction determine parts 1125, pixel compensation parts 1126 and look-up table 1127 respectively to subimage block and the alignment mark corresponding with it carry out with first preferred embodiment in for alignment mark with reproduce the performed operation identical operations of data image, thereby to corresponding pixel executing location compensation in the corresponding subimage block.

Therefore, according to the present invention, can realize effectively to prevent the reproduction of the hologram data that reproduction image quality that the linear/non-linear distortion owing to entire image causes reduces, its implementation makes a plurality of alignment marks of use and data image is divided into a plurality of subimage blocks, and the pixel executing location of corresponding subimage block is compensated.

As mentioned above, conventional method is that data image is divided into equal part, and its number equals the number of distortion pixel, and according to pixels distortion compensation is carried out in the unit.In contrast, the present invention is the positional value that finds the edge, four limits that reproduces data image, use the positional value at edge, four limits to calculate the average fault in enlargement value of respective pixel, and use the respective pixel position that compensates the reproduction data image that is extracted corresponding to the misalignment offset of the respective pixel of the mean value that calculates.Optionally, the present invention uses a plurality of alignment marks and is divided into a plurality of subimage blocks reproducing data image, these a plurality of alignment marks are inserted into and record several presumptive areas in the reproduced image frame when writing down, find the subimage block divided the positional value at edge, four limits, use the positional value at edge, four limits to calculate the average fault in enlargement value of respective pixel in the subimage block, and use the location of pixels that compensates the subimage block of being divided corresponding to the misalignment offset of the respective pixel of the mean value that calculates.Therefore, compare with the conventional method of using sampling technique, the invention has the advantages that, it not only can realize the reconstruction of hologram system that volume is little, cost is low, but also can prevent to reproduce the problem that speed reduces effectively.

Though illustrated and described the present invention, it will be understood by those of skill in the art that and to make various changes and change and do not break away from as the defined the spirit and scope of the present invention of following claims according to preferred embodiment.

Claims (28)

1. the device of a compensation pixel distortion when the reconstructing hologram data, this hologram data is recorded in the storage medium, as by reference light with carry out the interference figure that the modulated signal light interference obtains according to this hologram data, this device comprises:

Be used for extracting the unit that reproduces data image from containing the reproduced image frame that reproduces data image and border;

Be used to determine the positional value at each edge of the reproduction data image that extracts and the unit that calculates the average fault in enlargement value of outlet data interior pixel by the starting point and the terminal point locations of pixels value of line data, described starting point and terminal point locations of pixels value are based on the positional value at determined each edge, the size of the described reproduction data image that extracts of wherein said average fault in enlargement value representation and the ratio of the difference between the real data size and this real data size, and calculate described average fault in enlargement value by carrying out subtraction and division arithmetic;

The storage unit that is used for the form of the misalignment offset of each pixel in the storage line data, wherein said misalignment offset is corresponding to the predetermined benchmark of average fault in enlargement value; And

Be used to use the compensating unit that compensates the location of pixels in the reproduction data image that is extracted corresponding to the misalignment offset of the average fault in enlargement value that calculates.

2. according to the device of claim 1, further comprise the unit that is used for distinguishing the plurality of data district according to described beginning or end locations of pixels value and the average fault in enlargement value that calculates, these data fields are used to determine the wherein compensation direction of location of pixels,

Wherein this compensating unit comes the compensation pixel position according to the compensation direction of the data field of being distinguished.

3. according to the device of claim 1 or 2, wherein, the described average fault in enlargement value that calculates comprises the average fault in enlargement value of x direction and the average fault in enlargement value of y direction.

4. the method for a compensation pixel distortion when the reconstructing hologram data, this hologram data is recorded in the storage medium, as by reference light with carry out the interference figure that the modulated signal light interference obtains according to this hologram data, the method comprising the steps of:

Extract the reproduction data image from containing the reproduced image frame that reproduces data image and border;

Determine the positional value at each edge of the reproduction data image that extracts;

Determine the starting point and the terminal point locations of pixels value of line data according to the positional value at determined each edge;

According to determined starting point and terminal point locations of pixels value, calculate the average fault in enlargement value of line data interior pixel, the size of the described reproduction data image that extracts of wherein said average fault in enlargement value representation and the ratio of the difference between the real data size and this real data size, and calculate described average fault in enlargement value by carrying out subtraction and division arithmetic; And

Use compensates location of pixels in the reproduction data image that is extracted corresponding to the predetermined misalignment offset of the pixel of the average fault in enlargement value that calculates.

5. according to the method for claim 4, further comprise the step of distinguishing the plurality of data district according to beginning or end locations of pixels value and the average fault in enlargement value that calculates, these data fields are used to determine the compensation direction of location of pixels,

Wherein, the compensation direction according to the data field of being distinguished compensates corresponding location of pixels.

6. according to the method for claim 4 or 5, wherein, the described average fault in enlargement value that calculates comprises the average fault in enlargement value of x direction and the average fault in enlargement value of y direction.

7. according to the method for claim 6, the step of wherein calculating average fault in enlargement value may further comprise the steps:

Use following equation to calculate the fault in enlargement value X_mag_error of x direction and the fault in enlargement value Y_mag_error of y direction;

X_mag_error＝(x_2-x_1)-X_data_size

Y_mag_error＝(y_3-y_1)-Y_data_size

Use following equation to calculate the degrees of misalignment Δ x of each pixel x direction and the degrees of misalignment Δ y of each pixel y direction,

Δx＝X_mag_error/X_data_size

Δy＝Y_mag_error/Y_data_size

Wherein, X_data_size is the real data size on the x direction, x_1 is the starting point locations of pixels value on the x direction, x_2 is the terminal point locations of pixels value on the x direction, Y_data_size is the real data size on the y direction, y_1 is the starting point locations of pixels value on the y direction, and y_3 is the terminal point locations of pixels value on the y direction.

8. according to the method for claim 4 or 5, wherein, the predetermined misalignment offset of pixel is to be configured to corresponding to each predetermined benchmark of average fault in enlargement value and to be stored in some values in the form.

9. the device of a compensation pixel distortion when the reconstructing hologram data, this hologram data is recorded in the storage medium, as by reference light with carry out the interference figure that the modulated signal light interference obtains according to this hologram data, this device comprises:

Be used for from contain the reproduced image frame that reproduces data image and border extract reproduce data image and be inserted in the described border or be inserted into described each border with the reproduction data image between a fringe region in the unit of several alignment marks in precalculated position;

Be used to use the alignment mark that extracts to detect to reproduce the pixel misalignment degree in the data image and calculate the unit of misalignment corrected value according to testing result;

Be used for proofreading and correct location of pixels, and the unit of the positional value at each edge of this reproduction data image of definite its location of pixels after being corrected of this reproductions data image according to the misalignment corrected value that calculates;

Be used for determining the unit of the starting point and the terminal point locations of pixels value of line data according to the positional value at determined each edge;

Be used for coming the unit of the average fault in enlargement value of calculating pixel according to determined starting point and terminal point locations of pixels value, the size of the described reproduction data image that extracts of wherein said average fault in enlargement value representation and the ratio of the difference between the real data size and this real data size, and calculate described average fault in enlargement value by carrying out subtraction and division arithmetic;

The storage unit that is used for the form of the misalignment offset of each pixel in the storage line data, wherein said misalignment offset is corresponding to the predetermined benchmark of average fault in enlargement value; And

Be used to use the compensating unit that compensates the location of pixels in the reproduction data image that is extracted corresponding to the misalignment offset of the average fault in enlargement value that calculates.

10. according to the device of claim 9, further comprise the unit that is used for distinguishing according to the average fault in enlargement value that calculates several data fields, these data fields are used to determine the wherein compensation direction of location of pixels,

Wherein, this compensating unit comes the compensation pixel position according to the compensation direction of the data field of being distinguished.

11. according to the device of claim 10, wherein, the described average fault in enlargement value that calculates comprises the average fault in enlargement value of x direction and the average fault in enlargement value of y direction.

12. according to the device of arbitrary claim in the claim 9 to 11, wherein each alignment mark all has 4 * 4 block size, and has the interior open and closed of feasible wherein 2 * 2 sub-pieces by the shape of arranged alternate.

13. the method for a compensation pixel distortion when the reconstructing hologram data, this hologram data is recorded in the storage medium, as by reference light with carry out the interference figure that the modulated signal light interference obtains according to this hologram data, the method comprising the steps of:

From contain the reproduced image frame that reproduces data image and border extract reproduce data image and be inserted in the described border or be inserted into described each border with the reproduction data image between a fringe region in several alignment marks in some precalculated positions;

The alignment mark that use extracts detects the degrees of misalignment of reproducing the pixel in the data image, and calculates the misalignment corrected value according to testing result;

Proofread and correct the location of pixels of this reproduction data image according to the misalignment corrected value that calculates, determine the positional value at each edge of this reproduction data image after its location of pixels is corrected, and starting point and the terminal point locations of pixels value of determining the line data according to the positional value at determined each edge;

The average fault in enlargement value of coming calculating pixel according to determined starting point and terminal point locations of pixels value, the size of the described reproduction data image that extracts of wherein said average fault in enlargement value representation and the ratio of the difference between the real data size and this real data size, and calculate described average fault in enlargement value by carrying out subtraction and division arithmetic; And

Use compensates location of pixels in the reproduction data image that is extracted corresponding to the predetermined misalignment offset of the pixel of the average fault in enlargement value that calculates.

14. according to the method for claim 13, further comprise the step of distinguishing several data fields according to the average fault in enlargement value that calculates, these data fields are used to determine the compensation direction of location of pixels,

Wherein, the compensation direction according to the data field of being distinguished compensates each location of pixels.

15. according to the method for claim 13, wherein, the described average fault in enlargement value that calculates comprises the average fault in enlargement value of x direction and the average fault in enlargement value of y direction.

16. according to the method for arbitrary claim in the claim 13 to 15, wherein each alignment mark all has 4 * 4 block size, and has the open and closed that make in 2 * 2 sub-pieces wherein by the shape of arranged alternate.

17. the device of a compensation pixel distortion when the reconstructing hologram data, this hologram data is recorded in the storage medium, as by reference light with carry out the interference figure that the modulated signal light interference obtains according to this hologram data, this device comprises:

Be used for from contain the reproduced image frame that reproduces data image, border and a plurality of alignment marks extract to reproduce data image and be inserted in the described border or be inserted into described each border with a fringe region that reproduces between the data image in some precalculated positions and by the unit of a plurality of alignment marks of predetermined space formation;

Be used for according to the next unit that the reproduction data image that is extracted is divided into a plurality of subimage blocks of these a plurality of alignment marks that extract;

Be used for determining the positional value at each edge of each subimage block and the unit that calculates the average fault in enlargement value of corresponding subimage block interior pixel by the starting point and the terminal point locations of pixels value of line data, the starting point of described line data and terminal point locations of pixels value are based on the positional value at determined each edge, the size of the described reproduction data image that extracts of wherein said average fault in enlargement value representation and the ratio of the difference between the real data size and this real data size, and calculate described average fault in enlargement value by carrying out subtraction and division arithmetic;

The storage unit that is used for the form of the misalignment offset of each pixel in the storage line data, wherein said misalignment offset is corresponding to several predetermined benchmark of average fault in enlargement value; And

Be used to use the compensating unit that compensates corresponding location of pixels in the corresponding subimage block corresponding to the misalignment offset of the average fault in enlargement value that calculates.

18. device according to claim 17, further comprise the unit that is used for distinguishing several data fields according to beginning or end locations of pixels value and the average fault in enlargement value that calculates, these data fields are used to determine the compensation direction of corresponding subimage block interior pixel position

Wherein, this compensating unit compensates location of pixels in the corresponding subimage block according to the compensation direction of the data field of being distinguished.

19. device according to claim 18, wherein, when the value that obtains whenever the average fault in enlargement value on beginning or end locations of pixels value that calculates by adding up reaches 0.5 * n, just change the compensation direction with respect to each data field, wherein n is an integer.

20. according to the device of arbitrary claim in the claim 17 to 19, wherein, the described average fault in enlargement value that calculates comprises the average fault in enlargement value of x direction and the average fault in enlargement value of y direction.

21. according to the device of arbitrary claim in the claim 17 to 19, wherein each alignment mark all has 4 * 4 block size, and has the open and closed that make in 2 * 2 sub-pieces wherein by the shape of arranged alternate.

22. the method for a compensation pixel distortion when the reconstructing hologram data, this hologram data is recorded in the storage medium, as by reference light with carry out the interference figure that the modulated signal light interference obtains according to this hologram data, the method comprising the steps of:

From contain the reproduced image frame that reproduces data image, several borders and a plurality of alignment marks extract to reproduce data image and be inserted in the described border or be inserted into described each border with a fringe region that reproduces between the data image in some precalculated positions on and by a plurality of alignment marks of predetermined space formation;

According to these a plurality of alignment marks that extract, the reproduction data image that is extracted is divided into a plurality of subimage blocks;

Determine the positional value at each edge of each subimage block;

According to the positional value at determined each edge, determine the starting point and the terminal point locations of pixels value of line data;

According to determined starting point and terminal point locations of pixels value, calculate the average fault in enlargement value of corresponding subimage block interior pixel, the size of the described reproduction data image that extracts of wherein said average fault in enlargement value representation and the ratio of the difference between the real data size and this real data size, and calculate described average fault in enlargement value by carrying out subtraction and division arithmetic; And

Use compensates location of pixels in the described subimage block corresponding to the predetermined misalignment offset of the pixel of the average fault in enlargement value that calculates.

23. method according to claim 22, further comprise the step of distinguishing several data fields according to beginning or end locations of pixels value and the average fault in enlargement value that calculates, these data fields are used to determine the compensation direction of the location of pixels in the corresponding subimage block

Wherein, the compensation direction according to the data field of being distinguished comes the compensation pixel position.

24. method according to claim 23, wherein, when the value that obtains whenever the average fault in enlargement value on beginning or end locations of pixels value that calculates by adding up reaches 0.5 * n, just change the compensation direction with respect to each data field, wherein n is an integer.

25. according to the method for claim 22, wherein, the described average fault in enlargement value that calculates comprises the average fault in enlargement value of x direction and the average fault in enlargement value of y direction.

26. according to the method for claim 25, wherein, the step of calculating average fault in enlargement value may further comprise the steps:

Use following equation to calculate the fault in enlargement value X_mag_error of x direction and the fault in enlargement value Y_mag_error of y direction;

X_mag_error＝(x_2-x_1)-X_data_size

Y_mag_error＝(y_3-y_1)-Y_data_size

Use following equation to calculate the degrees of misalignment Δ y of the y direction of the degrees of misalignment Δ x of x direction of each pixel and each pixel,

Δx＝X_mag_error/X_data_size

Δy＝Y_mag_error/Y_data_size

Wherein, X_data_size is the real data size on the x direction, x_1 is the starting point locations of pixels value on the x direction, x_2 is the terminal point locations of pixels value on the x direction, Y_data_size is the real data size on the y direction, y_1 is the starting point locations of pixels value on the y direction, and y_3 is the terminal point locations of pixels value on the y direction.

27. according to the method for claim 23, wherein, the predetermined misalignment offset of described pixel is to be configured to corresponding to each predetermined benchmark of average fault in enlargement value and to be stored in value in the form.

28. according to the method for arbitrary claim in the claim 22 to 27, wherein each alignment mark all has 4 * 4 block size, and has the open and closed that make in 2 * 2 sub-pieces wherein by the shape of arranged alternate.

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