CN113014901A - Parallax image sequence synthesis method and system for holographic volume view printing and storage medium - Google Patents
Parallax image sequence synthesis method and system for holographic volume view printing and storage medium Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
- H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
- H04N13/106—Processing image signals
- H04N13/156—Mixing image signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
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Abstract
The invention relates to a parallax image sequence synthesis method, a system and a storage medium for holographic volume view printing, wherein the method comprises the following steps: acquiring a sub-parallax image sequence; establishing a world coordinate system by taking the synthesized parallax image sequence as a reference; importing the sub parallax image sequence into a three-dimensional modeling platform; generating a view field plane by any point on the optical axis of the synthetic camera, and dividing the view field plane into a plurality of cells; connecting the original point of the synthetic camera with the central point of the cell to generate a ray, calculating intersection points of the ray extension line and corresponding images in each sub parallax image sequence, if the intersection points exist, calculating the distance between the original point of the synthetic camera and each intersection point, selecting a coordinate point corresponding to the minimum distance, and extracting four adjacent pixel values of the coordinate point to calculate to obtain a result pixel value; and sequentially calculating the parallax image pixel values corresponding to each synthesis camera to generate a synthesis parallax image sequence. The method can be directly operated in the three-dimensional modeling platform, has low limitation and strong operability, and is convenient for users to observe, set and operate.
Description
Technical Field
The invention relates to the technical field of holographic volume view printing, in particular to a parallax image sequence synthesis method, a parallax image sequence synthesis system and a storage medium for holographic volume view printing.
Background
The holographic volume view printing can realize three-dimensional online of a three-dimensional scene, the printing needs to successively expose the holographic units, each holographic unit corresponds to a synthesized parallax image, and an algorithm from a sampling image to the synthesized parallax image is a key research content in the view printing. However, the conventional composite parallax image algorithm cannot be operated by using a three-dimensional modeling platform only when there is a generated and independent parallax image sequence, and has a certain limitation. Therefore, the prior art has yet to be developed.
Disclosure of Invention
The present invention is directed to overcoming the disadvantages of the prior art and providing an improved method, system and storage medium for synthesizing a parallax image sequence for holographic volume view printing.
In order to achieve the above purpose, the invention provides the following technical scheme:
the invention provides a parallax image sequence synthesis method for holographic volume view printing, which comprises the following steps:
s100: obtaining N generated sub-parallax image sequences A, wherein the jth image in the ith sub-parallax image is
The number of cameras of each sub parallax image sequence A is M;
s200: recording the synthesized parallax image sequence as B, establishing a world coordinate system by taking the synthesized parallax image sequence B as a reference, wherein the origin of the world coordinate system is positioned at the position of a central camera of the synthesized parallax image sequence B, and the optical axis of the central camera is designated as the Z axis;
s300: importing the sub parallax image sequences A into a three-dimensional modeling platform, wherein the origin of a central camera of each sub parallax image sequence A is located at the origin of a world coordinate system, and each sub optical axis is superposed with a Z axis;
s400: setting the field angle α of the synthesized parallax image sequence BBAccording to the field angle αBGenerating a view field plane by any point on the optical axis of the synthetic camera, dividing the view field plane into a plurality of cells according to the image resolution of the synthetic parallax image sequence B, wherein each cell corresponds to a pixel point;
s500: connecting the original point of the synthetic camera and the central point of the cell to generate a ray, calculating the intersection point of the ray extension line and the corresponding image in each sub parallax image sequence, if the intersection point exists, calculating the distance between the original point of the synthetic camera and each intersection point, selecting a coordinate point corresponding to the minimum distance, extracting four adjacent pixel values of the coordinate point, and obtaining a result pixel value by using a bilinear interpolation algorithm;
s600: and sequentially calculating the parallax image pixel values corresponding to each synthesis camera to generate a synthesis parallax image sequence.
Further, the method also comprises the step S301: and performing rotation and translation on the central camera of each sub parallax image sequence.
Further, the method further includes step S501: if the ray extension line does not have an intersection point with the corresponding image in each sub-parallax image sequence, the pixel value of the image at the position is the background pixel value 0.
Further, the three-dimensional coordinates of the sub-pixels of the sub-parallax image sequence a in the world coordinate system are:
after rotating the camera of each sub parallax image sequence by R unit and translating the camera by T unit, the central camera of each sub parallax image sequence is:
further, connecting the original point of the synthesis camera and the central point of the cell, generating a ray, and calculating the intersection point of the ray extension line and the corresponding image in each sub parallax image sequence specifically comprises:
setting the included angle between the center and the interval of a camera array of the synthesized parallax image sequence B, and calculating the position of the camera array, wherein the number of cameras in the camera array is also M; wherein, the coordinate of the jth camera center in the world coordinate system is recorded as
The optical axis of the composite image points to the center of the camera array, and the sub-pixel of the ith composite image is set as
Corresponding sub-pixel center coordinate is
Calculating the sub-image plane by taking three pixel points of a sub-image in each sub-parallax sequence, and recording the jth image in the ith sub-parallax image
The image plane of
To synthesize the jth camera center in the camera
As a starting point, connect
Generating rays
Calculating a ray
With the jth image plane in each sub-parallax image sequence A
Point of intersection of。
Further, if the ray is irradiated
And intersection points exist between the image plane and the K image planes, wherein K is less than or equal to M, and the coordinate set of all the intersection points in the world coordinate system is as follows:
if K is equal to 0, setting the sub-pixel
The pixel value of (a) is a background pixel value of 0;
if K is greater than 0, calculating each intersection point
With the current camera origin
Distance between them
Taking the intersection point corresponding to the minimum distance
And calculating to obtain two-dimensional floating point coordinates of the corresponding image as follows:
taking the pixel values at the four nearest integer coordinates of the two-dimensional floating point coordinate:
wherein the content of the first and second substances,
and
operators of rounding-down and rounding-up respectively;
calculating the pixel value of the floating point by using a bilinear interpolation method, and assigning the pixel value to a sub-pixel of the jth composite image
And sequentially calculating the pixel values of all images in the synthesized parallax image sequence to generate the synthesized parallax image sequence for printing the holographic volume view.
Further, dividing the plane of the field of view into a plurality of cells according to the image resolution of the composite parallax image sequence B specifically includes:
the resolution of the synthesized parallax image sequence B is (W)B,HB) Dividing the field plane into WB×HBAnd (5) dividing into small grids.
The present invention also provides a system comprising a memory, a processor and a computer program stored in the memory and configured to be executed by the processor, wherein the processor implements the parallax image sequence synthesis method as described above when executing the computer program.
The present invention also provides a computer-readable storage medium in which a computer program is stored, which, when executed, implements the parallax image sequence synthesis method as described above.
The technical scheme of the invention has the following beneficial effects:
according to the parallax image sequence synthesis method, the plurality of sub parallax image sequences are directly led into the three-dimensional modeling platform, then the synthesized parallax image sequence with the plurality of scenes or models is generated and used for printing the holographic volume view, and the method can be directly operated in the three-dimensional modeling platform, is low in limitation and high in operability, and facilitates observation, setting and operation of a user.
Drawings
Fig. 1 is a flowchart of a parallax image sequence synthesis method of the present invention;
fig. 2 is a schematic diagram of the sub parallax image and the composite parallax image according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the present invention, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "connected" may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
Referring to fig. 1, the present invention provides a method for synthesizing a parallax image sequence for holographic volume-view printing, comprising the following steps:
s100: acquiring N generated sub-parallax image sequences A, wherein the sub-parallax image sequences A are source images and are acquired by a camera and recorded as { A }1,A2,...,ANJ, wherein j image in i sub-parallax image is
The number of cameras of each sub parallax image sequence A is M;
s200: recording the synthesized parallax image sequence as B, establishing a world coordinate system by taking the synthesized parallax image sequence B as a reference, wherein the origin of the world coordinate system is positioned at the position of a central camera of the synthesized parallax image sequence B, and the optical axis of the central camera is designated as the Z axis; since the parallax image includes depth information, the specific coordinates of the camera can be obtained from the depth information.
S300: importing the sub parallax image sequences A into a three-dimensional modeling platform, wherein the origin of a central camera of each sub parallax image sequence A is located at the origin of a world coordinate system, and each sub optical axis is superposed with a Z axis; in the embodiment, the three-dimensional modeling platform can display corresponding point clouds, center camera coordinates, a view field, an optical axis and the like of the center camera, data are visual, and observation and operation of a user are facilitated.
S400: setting the field angle α of the synthesized parallax image sequence BBAccording to the field angle αBGenerating a view field plane by any point on the optical axis of the synthetic camera, dividing the view field plane into a plurality of cells according to the image resolution of the synthetic parallax image sequence B, wherein each cell corresponds to a pixel point;
s500: connecting the original point of the synthetic camera and the central point of the cell to generate a ray, calculating the intersection point of the ray extension line and the corresponding image in each sub parallax image sequence, if the intersection point exists, calculating the distance between the original point of the synthetic camera and each intersection point, selecting a coordinate point corresponding to the minimum distance, extracting four adjacent pixel values of the coordinate point, and obtaining a result pixel value by using a bilinear interpolation algorithm;
s600: and sequentially calculating the parallax image pixel values corresponding to each synthesis camera to generate a synthesis parallax image sequence.
According to the parallax image sequence synthesis method, the plurality of sub parallax image sequences are directly led into the three-dimensional modeling platform, then the synthesized parallax image sequence with the plurality of scenes or models is generated and used for printing the holographic volume view, and the method can be directly operated in the three-dimensional modeling platform, is low in limitation and high in operability, and facilitates observation, setting and operation of a user.
Since the corresponding sub-scene models in each sub-parallax image sequence may have an overlap phenomenon, the method further includes step S301: and performing rotation and translation on the central camera of each sub parallax image sequence. And performing rotary translation on the sub-scene models to spread the sub-scene models, and performing rotary translation on the cameras of the sub-parallax image sequences to equivalently realize the rotary translation on the sub-scene models.
Preferably, the parallax image sequence synthesizing method of the present invention further comprises step S501: if the ray extension line does not have an intersection point with the corresponding image in each sub-parallax image sequence, the pixel value of the image at the position is the background pixel value 0, namely the whole background is black.
Further, the three-dimensional coordinates of the sub-pixels of the sub-parallax image sequence a in the world coordinate system are:
the three-dimensional coordinates are used as a reference and a basis for performing rotation translation on each sub parallax image sequence camera. After rotating the camera of each sub parallax image sequence by R unit and translating the camera by T unit, the central camera of each sub parallax image sequence is:
as an embodiment, connecting the original point of the synthesis camera and the central point of the cell, generating a ray, and calculating the intersection point of the extension line of the ray and the corresponding image in each sub parallax image sequence specifically includes:
setting the center of a camera array of the synthesized parallax image sequence B and an interval included angle, wherein the interval included angle represents the included angle of adjacent cameras, and calculating the position of the camera array, wherein the number of the cameras in the camera array is also M; wherein, the coordinate of the jth camera center in the world coordinate system is recorded as
With its optical axis pointing towards the center of the camera array.
The resolution of the synthesized parallax image sequence B is (W)B,HB) Since the image pixel content acquired by the synthesis camera is derived from the corresponding sub-sequence image, the view field plane is divided into W according to the image resolution of the synthesis parallax image sequence BB×HBAnd each cell corresponds to a sub-pixel of the composite image, and the coordinates of each cell in the world coordinate system can be calculated. Let the sub-pixel of the ith composite image be
Corresponding sub-pixel center coordinate is
As shown in fig. 2, three pixel points of a sub-image in each sub-parallax sequence are taken to calculate the sub-image plane, and the jth image in the ith sub-parallax image is recorded
The image plane of
To synthesize the jth camera center in the camera
As a starting point, connect
Generating rays
Calculating a ray
With the jth image plane in each sub-parallax image sequence A
The intersection point of (a).
If ray
And intersection points exist between the image plane and the K image planes, wherein K is less than or equal to M, and the coordinate set of all the intersection points in the world coordinate system is as follows:
if K is 0, namely the ray extension line does not have an intersection point with the corresponding image in each sub-parallax image sequence, setting the sub-pixel
The pixel value of (2) is a background pixel value of 0, namely black;
if K is greater than 0, calculating each intersection point
With the current camera origin
Distance between them
Taking the intersection point corresponding to the minimum distance
And calculating to obtain two-dimensional floating point coordinates of the corresponding image as follows:
taking the pixel values at the four nearest integer coordinates of the two-dimensional floating point coordinate:
wherein the content of the first and second substances,
and
operators of rounding-down and rounding-up respectively;
calculating the pixel value of the floating point by using a bilinear interpolation method, and assigning the pixel value to a sub-pixel of the jth composite image
And sequentially calculating the pixel values of all images in the synthesized parallax image sequence to generate the synthesized parallax image sequence for printing the holographic volume view.
The invention also provides a system comprising a memory, a processor and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the parallax image sequence synthesis method as claimed in the preceding paragraph when executing the computer program.
Illustratively, the computer program may be partitioned into one or more modules/units that are stored in the memory and executed by the processor to implement the invention. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program in the asynchronous message processing terminal device.
The system may include, but is not limited to, a processor, a memory. It will be appreciated by those skilled in the art that the components described above are merely examples based on a system and do not constitute a limitation on a system, and that more or fewer components than described above may be included, or certain components may be combined, or different components may be included, for example, a system may also include input-output devices, network access devices, buses, etc.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like that is the control center for the device and that connects the various parts of the overall system using various interfaces and lines.
The memory may be used to store the computer programs and/or modules, and the processor may implement the various functions of the apparatus by running or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (such as a sound playing function, an image playing function, etc.), and the like; the storage data area may store data created according to usage (such as audio data, a phonebook, etc.), and the like. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
The present invention also provides a computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, which when executed implements the parallax image sequence synthesis method as described above.
It should be noted that the above-described embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, and may be specifically implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
The above examples of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications which are obvious to the technical scheme of the invention are covered by the protection scope of the invention.
Claims (9)
1. A method of synthesizing a sequence of parallax images for holographic volume view printing, comprising the steps of:
s100: obtaining N generated sub-parallax image sequences A, wherein the jth image in the ith sub-parallax image is
The number of cameras of each sub parallax image sequence A is M;
s200: recording the synthesized parallax image sequence as B, establishing a world coordinate system by taking the synthesized parallax image sequence B as a reference, wherein the origin of the world coordinate system is positioned at the position of a central camera of the synthesized parallax image sequence B, and the optical axis of the central camera is designated as the Z axis;
s300: importing the sub parallax image sequences A into a three-dimensional modeling platform, wherein the origin of a central camera of each sub parallax image sequence A is located at the origin of a world coordinate system, and each sub optical axis is superposed with a Z axis;
s400: setting the field angle α of the synthesized parallax image sequence BBAccording to the field angle αBGenerating a view field plane by any point on the optical axis of the synthetic camera, dividing the view field plane into a plurality of cells according to the image resolution of the synthetic parallax image sequence B, wherein each cell corresponds to a pixel point;
s500: connecting the original point of the synthetic camera and the central point of the cell to generate a ray, calculating the intersection point of the ray extension line and the corresponding image in each sub parallax image sequence, if the intersection point exists, calculating the distance between the original point of the synthetic camera and each intersection point, selecting a coordinate point corresponding to the minimum distance, extracting four adjacent pixel values of the coordinate point, and obtaining a result pixel value by using a bilinear interpolation algorithm;
s600: and sequentially calculating the parallax image pixel values corresponding to each synthesis camera to generate a synthesis parallax image sequence.
2. The parallax image sequence synthesizing method according to claim 1, further comprising step S301 of: and performing rotation and translation on the central camera of each sub parallax image sequence.
3. The parallax image sequence synthesizing method according to claim 1, further comprising step S501: if the ray extension line does not have an intersection point with the corresponding image in each sub-parallax image sequence, the pixel value of the image at the position is the background pixel value 0.
4. A parallax image sequence synthesis method according to claim 2, wherein the three-dimensional coordinates of the sub-pixels of the sub-parallax image sequence a in the world coordinate system are:
after rotating the camera of each sub parallax image sequence by R unit and translating the camera by T unit, the central camera of each sub parallax image sequence is:
5. the parallax image sequence synthesis method according to claim 4, wherein connecting the origin of the synthesis camera and the cell center point, generating a ray, and calculating the intersection point of the ray extension line and the corresponding image in each sub parallax image sequence specifically comprises:
setting the included angle between the center and the interval of a camera array of the synthesized parallax image sequence B, and calculating the position of the camera array, wherein the number of cameras in the camera array is also M; wherein, the coordinate of the jth camera center in the world coordinate system is recorded as
The optical axis of the composite image points to the center of the camera array, and the sub-pixel of the ith composite image is set as
Corresponding sub-pixel center coordinate is
Calculating the sub-image plane by taking three pixel points of a sub-image in each sub-parallax sequence, and recording the jth image in the ith sub-parallax image
The image plane of
To synthesize the jth camera center in the camera
As a starting point, connect
Generating rays
Calculating a ray
With the jth image plane in each sub-parallax image sequence A
The intersection point of (a).
6. A method for synthesis of a sequence of parallax images according to claim 5, wherein the ray is a ray
And intersection points exist between the image plane and the K image planes, wherein K is less than or equal to M, and the coordinate set of all the intersection points in the world coordinate system is as follows:
if K is equal to 0, setting the sub-pixel
The pixel value of (a) is a background pixel value of 0;
if K is greater than 0, calculating each intersection point
With the current camera origin
Distance between them
Taking the intersection point corresponding to the minimum distance
And calculating to obtain two-dimensional floating point coordinates of the corresponding image as follows:
taking the pixel values at the four nearest integer coordinates of the two-dimensional floating point coordinate:
wherein the content of the first and second substances,
and
operators of rounding-down and rounding-up respectively;
calculating the pixel value of the floating point by using a bilinear interpolation method, and assigning the pixel value to a sub-pixel of the jth composite image
And sequentially calculating the pixel values of all images in the synthesized parallax image sequence to generate the synthesized parallax image sequence for printing the holographic volume view.
7. The method for synthesizing a parallax image sequence according to claim 1, wherein dividing a plane of a field of view into a plurality of cells in accordance with an image resolution of the synthesized parallax image sequence B specifically comprises:
the resolution of the synthesized parallax image sequence B is (W)B,HB) Dividing the field plane into WB×HBAnd (5) dividing into small grids.
8. A system comprising a memory, a processor and a computer program stored in the memory and configured to be executed by the processor, when executing the computer program, implementing the parallax image sequence synthesis method according to any one of claims 1 to 7.
9. A computer-readable storage medium, in which a computer program is stored, which when executed implements the parallax image sequence synthesis method according to any one of claims 1 to 7.
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