KR101090787B1 - Apparatus and Method for Processing by Using Depth Transformation - Google Patents
Apparatus and Method for Processing by Using Depth Transformation Download PDFInfo
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- KR101090787B1 KR101090787B1 KR1020100047542A KR20100047542A KR101090787B1 KR 101090787 B1 KR101090787 B1 KR 101090787B1 KR 1020100047542 A KR1020100047542 A KR 1020100047542A KR 20100047542 A KR20100047542 A KR 20100047542A KR 101090787 B1 KR101090787 B1 KR 101090787B1
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- 238000012545 processing Methods 0.000 title claims description 28
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- 230000008859 change Effects 0.000 claims abstract description 37
- 238000003672 processing method Methods 0.000 claims abstract description 8
- 230000000873 masking effect Effects 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 9
- 238000001093 holography Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/08—Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms
- G03H1/0808—Methods of numerical synthesis, e.g. coherent ray tracing [CRT], diffraction specific
Abstract
The hologram processing method generates depth change information by calculating the high frequency component of the input data by calculating the high frequency component of the input data by changing the depth of the discontinuous pixel according to the boundary change of the input depth data, and follows the trajectory of the depth change information. Calculate average envelope information including change information about the depth of non-contiguous pixels of input depth data, and convert the depth map representing boundary information according to the depth change of input depth data based on the high frequency component as average envelope information. The final depth data is calculated by calculating the information, adding the input depth data and the depth map transformation information, and generating computer generated hologram (CGH) output data using the final depth data.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram processing method, and more particularly, to an apparatus and method for hologram processing using depth map transformation for processing input depth data by depth map transformation to generate enhanced hologram data.
Three-dimensional image and video playback technologies are actively being researched, and next-generation displays are expected to be developed as new immersive visual media that raises the level of visual information.
Three-dimensional image reproduction technologies include stereoscopy, holography, and intergral imaging.
Among these, the holography method is a method in which a viewer observes a virtual image of a virtual image while looking at the holography at a certain distance from the front of the holography when the light source is illuminated on the holography.
The principle of the hologram is to divide the beam from the laser into two, so that one ray is directly on the screen and the other is on the target.
In this case, a light beam that directly shines on the screen is called a reference wave, and a light beam that shines on an object is called an object wave.
The object wave is the light reflected from each surface of the object, so the phase difference is different depending on the distance from the object surface to the screen.
At this time, the interference pattern generated by the unmodified reference wave interferes with the object wave and is stored on the screen. Films in which such interference fringes are stored are called holograms.
The hologram processing receives the depth data, generates a hologram pattern, and outputs the hologram data using the hologram reconstruction tool hologram.
Recognition of hologram data is based on attributes of depth data input to hologram processing.
However, until now, in order to improve the recognition of the hologram data, the research has focused on the method of outputting the hologram data by hologram processing the depth data rather than focusing on the attributes of the input depth data.
That is, there is no conventional method for outputting enhanced hologram data by processing an attribute of input depth data.
In order to solve such a problem, an object of the present invention is to provide a hologram processing apparatus and method using a depth map transform to process the input depth data by the depth map transform to generate improved hologram data.
According to an aspect of the present invention, there is provided a hologram processing apparatus including an unsharp masking processor configured to calculate a high frequency component of an input data by changing a depth of a discontinuous pixel according to a boundary change of an input depth data. ; Depth change information is generated by calculating an absolute value of the high frequency component, and includes average envelope information including change information about a depth of a discontinuous pixel of the input depth data while following the trajectory of the depth change information. An average envelope processing unit for calculating; A depth map converter for calculating depth map transformation information representing boundary information according to a change in depth of the input depth data based on the high frequency component based on the average envelope information; A final depth data calculator configured to calculate final depth data by adding the input depth data and the depth map transformation information; And a CGH generator configured to generate computer generated hologram (CGH) output data using the final depth data.
According to an aspect of the present invention, there is provided a hologram processing method comprising: calculating a high frequency component of the input data by changing a depth of a discontinuous pixel according to a boundary change of the input depth data; Generating depth change information by calculating an absolute value of the high frequency component; Calculating average envelope information including change information about a depth of a discontinuous pixel of the input depth data while following the trajectory of the depth change information; Calculating depth map transformation information representing boundary information according to a change in depth of the input depth data based on the high frequency component as the average envelope information; And calculating final depth data by adding the input depth data and the depth map transformation information, and generating computer generated hologram (CGH) output data using the final depth data.
By the above-described configuration, the present invention has the effect of generating the improved hologram data by processing the input depth data by the depth map transformation.
1 is a diagram illustrating a hologram processing apparatus using a depth map transformation according to an exemplary embodiment of the present invention.
2 is a block diagram illustrating a hologram processing process according to an embodiment of the present invention.
3 is a diagram illustrating Gaussian filtered depth data in an unsharp masking processor according to an exemplary embodiment of the present invention.
4 is a diagram illustrating average envelope information in an average envelope processor according to an exemplary embodiment of the present invention.
5 is a diagram illustrating depth map transformation information in a depth map transformation unit according to an embodiment of the present invention.
6A illustrates final depth data to which DELTA D / De is applied in the final depth data calculator according to an exemplary embodiment of the present invention.
6B illustrates final depth data to which DELTA D is applied in the final depth data calculator according to an exemplary embodiment of the present invention.
7 is a diagram illustrating a hologram processing method using a depth map transformation according to an embodiment of the present invention.
DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.
Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise.
1 is a diagram illustrating a hologram processing apparatus using a depth map transformation according to an embodiment of the present invention, and FIG. 2 is a block diagram illustrating a hologram processing process according to an embodiment of the present invention.
The
The
The
The unsharp
A process of obtaining DELTA D, which is the output data of the unsharp
Where D is input depth data,
Denotes data obtained by applying a Gaussian low frequency filter (G) to the input depth data.As shown in FIG. 3, when the input depth data is given, the
In more detail, when the depth value of a pixel of a scan line is 100, 100, 100, 150, 150, 150, the edge of the depth map is in the middle of 100 and 150.
Accordingly, when the unsharp
The average
Average envelope information (output data of the average envelope processing unit 130 (
) Is expressed as in [Equation 2].
Here, G denotes a spatial low pass filter with variance σ.
As illustrated in FIG. 5, the
A process of obtaining the depth map conversion information Ds, which is the output data of the
Here, D max uses 1.4 as the scan sector and is a parameter that scales the boundary change of the input depth data.
The
The final
6A illustrates a case where D / De is used to obtain depth map transformation information Ds, and FIG. 5B illustrates a case where DELTA D is used to obtain depth map transformation information Ds.
As shown in FIG. 6B, it can be seen that D 'suddenly changes at the boundary at which the input depth data changes.
Such abrupt changes in D 'are not good for computer generated holograms (CGHs) and reconstructed images.
Since the method of generating and restoring the fringe pattern is obvious to those skilled in the art, detailed descriptions thereof will be omitted within the scope of not obscuring the features of the present invention.
The CGH generation method receives normalized depth data, generates an intermediate parameter to create a hologram using the normalized depth data (z), and uses the input depth data (Depth) and an intermediate parameter to create a hologram as the CGH output data. Create a fringe pattern.
The normalized depth data z is calculated using Equation 4 below using the input depth data Depth.
Here, D [i] [j] represents input depth data, and i and j represent integer values.
The intermediate parameter R for making a hologram is calculated using Equation 5 using normalized depth data.
Here, P represents 0.0000104 in pixel pitch and x, y represents image size.
The fringe pattern is calculated as shown in Equation 6 using the input depth data D and the intermediate parameter R that makes the hologram.
Where W and H represent a width and a length that are the size of the input depth data, and k is a wave number.
Respectively. λ represents 9926043.4154818337 (red). Red, blue, and yellow use different wavelength values, and red produces the best hologram.The
Since D '= D + Ds, the normalized depth data z' according to an embodiment of the present invention uses the input depth data D [i] [j] and the depth map transformation information Ds. Is calculated as shown in Equation 7].
The
The intermediate parameter R 'for making a hologram is calculated using Equation 8 using normalized depth data z'.
Since Ds << 255, this can be assumed to be R '= R.
The
The fringe pattern is calculated as shown in Equation 9 by using the input depth data D [i] [j], the depth map conversion information Ds, and the intermediate parameter R 'for creating a hologram.
As shown in Equation 9, since the Ds value is 0 in the flat region, there is no effect. However, if the Ds value is not 0, it has a negative or positive value and thus affects the fringe pattern.
The CGH
7 is a diagram illustrating a hologram processing method using a depth map transformation according to an embodiment of the present invention.
The
The
The average
The
The final
The
The embodiments of the present invention described above are not implemented only by the apparatus and / or method, but may be implemented through a program for realizing functions corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded And such an embodiment can be easily implemented by those skilled in the art from the description of the embodiments described above.
Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.
Claims (6)
Depth change information is generated by calculating an absolute value of the high frequency component, and includes average envelope information including change information about a depth of a discontinuous pixel of the input depth data while following the trajectory of the depth change information. An average envelope processing unit for calculating;
A depth map converter for calculating depth map transformation information representing boundary information according to a change in depth of the input depth data based on the high frequency component based on the average envelope information;
A final depth data calculator configured to calculate final depth data by adding the input depth data and the depth map transformation information; And
CGH generator for generating Computer Generated Hologram (CGH) output data using the final depth data
Hologram processing apparatus comprising a.
The unsharp masking processing unit,
And a high frequency component of the input depth data is calculated by applying a Gaussian low frequency filter to the input depth data and subtracting the low frequency component from the input depth data.
The depth map converter,
And dividing the high frequency component into the average envelope information and calculating the depth map transformation information using a parameter for scaling a boundary change of the input depth data.
Generating depth change information by calculating an absolute value of the high frequency component;
Calculating average envelope information including change information about a depth of a discontinuous pixel of the input depth data while following the trajectory of the depth change information;
Calculating depth map transformation information representing boundary information according to a change in depth of the input depth data based on the high frequency component as the average envelope information; And
Calculating final depth data by adding the input depth data and the depth map conversion information and generating computer generated hologram (CGH) output data using the final depth data.
Hologram processing method comprising a.
The step of calculating the high frequency component,
Calculating a high frequency component of the input depth data by applying a Gaussian low frequency filter to the input depth data and subtracting the low frequency component from the input depth data.
Hologram processing method comprising a.
Generating the depth change information,
Generating the depth change information by applying a spatial low pass filter to the absolute value;
Hologram processing method comprising a.
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KR101906936B1 (en) * | 2012-01-19 | 2018-10-11 | 삼성전자주식회사 | Apparatus and method of generating light field hologram |
EP2629156B1 (en) | 2012-01-27 | 2024-04-17 | Samsung Electronics Co., Ltd. | Image processing apparatus and method |
KR101421984B1 (en) * | 2012-10-16 | 2014-07-28 | 목포해양대학교 산학협력단 | A Fast Generation Method of Digital Hologram Using Depth Difference Temporal Filtering |
KR102083584B1 (en) | 2013-04-15 | 2020-03-02 | 삼성전자주식회사 | Apparatus and method for generating hologram pattern |
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JP2007164862A (en) | 2005-12-12 | 2007-06-28 | Fuji Xerox Co Ltd | Hologram recording method and hologram recording device |
KR100973031B1 (en) | 2009-04-06 | 2010-07-30 | 광운대학교 산학협력단 | Method for generating 3d video computer generated hologram using look-up table and temporal redundancy, and apparatus thereof |
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JP2007164862A (en) | 2005-12-12 | 2007-06-28 | Fuji Xerox Co Ltd | Hologram recording method and hologram recording device |
KR100973031B1 (en) | 2009-04-06 | 2010-07-30 | 광운대학교 산학협력단 | Method for generating 3d video computer generated hologram using look-up table and temporal redundancy, and apparatus thereof |
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