Indication device

Abstract

To provide a display device and method for improving the quality of a 3D image.SOLUTION: A display device includes a view generator 110 for generating multiple input view numbers according to multiple reference parameters, a view curve modifier 120 coupled to the view generator 110 and for generating multiple output view numbers according to the multiple input view numbers and at least one s-curve, a three-dimensional (3D) image data sampling module 130 coupled to the view curve modifier 120 and for adjusting image data of multiple pixels according to the multiple output view numbers, and a display module 140 coupled to the 3D image data sampling module 130 and for displaying at least one image according to the multiple of pixels and the image data.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a display device, and more particularly, to a display device for improving the quality of three-dimensional (3D) images.

Background Art

[0002] Display devices using three-dimensional (3D) display technology have been developed and can provide a 3D visual effect to viewers. For example, by displaying images with appropriate viewing angles for the viewer's right and left eyes, the viewer can feel a 3D visual effect.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the prior art, display devices equipped with two-viewpoint 3D display technology or multi-viewpoint 3D display technology provide images of a predetermined viewing angle of an object to viewers. However, in this display device, a blurred image may be provided due to a phenomenon called crosstalk between views of the object. Therefore, there is a need for a display device that improves the quality of 3D images.

Means for Solving the Problems

[0005] Therefore, the present disclosure provides an apparatus and method for solving the above problems.

[0006] The display device comprises a view generator that generates a plurality of input view numbers according to a plurality of reference parameters; a view curve modifier coupled to the view generator that generates a plurality of output view numbers according to the plurality of input view numbers and at least one S-curve; a three-dimensional (3D) image data sampling module coupled to the view curve modifier that adjusts the image data of a plurality of pixels according to the plurality of output view numbers; and a display module coupled to the 3D image data sampling module that displays at least one image according to the plurality of pixels and the image data.

[0007] A method for improving the quality of a 3D image, comprising the steps of: generating a plurality of input view numbers according to a plurality of reference parameters; generating a plurality of output view numbers according to the plurality of input view numbers and at least one S-curve; adjusting image data of a plurality of pixels according to the plurality of output view numbers; and displaying at least one image according to the plurality of pixels and the image data. [Brief explanation of the drawing]

[0008] These and other purposes of the present disclosure should become apparent to those skilled in the art upon reading the following detailed description of the embodiments shown in various figures and drawings. [Figure 1] This is a schematic diagram of a display device according to one embodiment of the present disclosure. [Figure 2] This diagram shows the relationship between the original viewing position and the modified viewing position according to one embodiment of the present disclosure. [Figure 3] This diagram shows the relationship between the original viewing position and the modified viewing position according to one embodiment of the present disclosure. [Figure 4] This is a viewing pattern of a display module and an optical modulator according to one embodiment of the present disclosure. [Figure 5] This diagram shows the relationship between the original viewing position and the modified viewing position according to one embodiment of the present disclosure. [Figure 6]This diagram shows the relationship between the original viewing position and the modified viewing position according to one embodiment of the present disclosure. [Figure 7] This is a schematic diagram of a viewing scenario according to one embodiment of the present disclosure. [Figure 8] This is a schematic diagram of a display device according to one embodiment of the present disclosure. [Figure 9] This is a schematic diagram of multiple correction coefficients according to one embodiment of the present disclosure. [Figure 10] This is a flowchart of a process according to one embodiment of the present disclosure. [Modes for carrying out the invention]

[0009] In the following description and claims, terms are used to refer to specific components. As those skilled in the art will understand, electronic equipment manufacturers may refer to the same component by different names. This specification is not intended to distinguish between components that have different names but the same function. In the following description and claims, the terms “include” and “comprise” are used in an open-ended manner and should therefore be interpreted as “include, but not limited to.”

[0010] Figure 1 is a schematic diagram of a display device 10 according to one embodiment of the present disclosure. The display device 10 includes an eye-tracking module 100, a controller 102, a display module 140, and an optical modulator 150. More specifically, the controller 102 assigns image data to multiple pixels of the display module 140 and includes the eye-tracking module 100, a view generator 110, a view curve corrector 120, and a three-dimensional (3D) image data sampling module 130. The view generator 110 receives a plurality of reference parameters and generates a plurality of input view numbers according to the plurality of reference parameters. The view curve corrector 120 is coupled to the view generator 110 and receives a plurality of input view numbers. The view curve corrector 120 generates a plurality of output view numbers according to the plurality of input view numbers and at least one S-curve. The 3D image data sampling module 130 is coupled to the view curve corrector 120 and receives a plurality of output view numbers. The 3D image data sampling module 130 adjusts the image data of multiple pixels in the display module 140 according to multiple output view numbers. The display module 140 is coupled to the 3D image data sampling module 130 and displays at least one image according to the multiple pixels and image data. That is, at least one S-curve describes the relationship between multiple input view numbers and multiple output view numbers and corrects the view corresponding to the viewer's viewing position. Thus, image blur can be reduced, and the quality of the 3D image can be improved.

[0011] In one embodiment, the multiple reference parameters may include multiple positions of multiple pixels of the display module 140. In one embodiment, the multiple reference parameters may include multiple positions of the viewer's eyes. Furthermore, the eye-tracking module 100 is coupled to the view generator 110 to track multiple positions of the viewer's eyes and estimate the positions of the viewer's right and left eyes. In one embodiment, the multiple reference parameters may include at least one optical parameter of the optical modulator 150. The optical modulator 150 is coupled to the display module 140 to modulate multiple illumination directions of multiple pixels of the display module 140. For example, at least one optical parameter may include the pitch of the optical modulator 150, the angle of the optical modulator 150, or the alignment offset of the optical modulator 150. That is, the view generator 110 may generate an input view number according to the pixel positions, at least one optical parameter of the optical modulator 150, and multiple positions of the viewer's eyes.

[0012] In one embodiment, at least one S-shaped curve includes a plurality of line segments, At least one of the line segments among the multiple line segments has a slope less than or equal to 1. For example, the slope of at least one of the line segments among the multiple line segments may be between 0.2 and 0.4, but is not limited herein. In one embodiment, at least one S-curve includes multiple line segments, and at least two of those segments have the same slope. In one embodiment, at least one S-curve includes multiple line segments, and the slope of at least one of those segments is equal to zero. In one embodiment, one or more sets of multiple line segments may be connected directly or indirectly. In one embodiment, one or more sets of multiple line segments may be connected horizontally at a vertical distance from each other.

[0013] In one embodiment, at least one S-curve includes multiple planes, and at least two of these planes have the same normal vector. In another embodiment, at least one S-curve includes multiple planes, and at least two of these planes have different normal vectors. In another embodiment, one or more sets of multiple planes may be connected directly or indirectly.

[0014] In one embodiment, the view curve modifier 120 generates multiple output view numbers according to a plurality of input view numbers, at least one S-curve, and a lookup table. The lookup table provides the relationships between the plurality of input view numbers and the plurality of output view numbers. That is, the view curve modifier 120 may include a lookup table. In one embodiment, the view curve modifier 120 generates multiple output view numbers according to a plurality of input view numbers, at least one S-curve, and a function. The function provides the relationships between the plurality of input view numbers and the plurality of output view numbers. That is, the view curve modifier 120 may be a calculation module including a function. In one embodiment, the view curve modifier 120 generates multiple output view numbers according to a plurality of input view numbers, at least one S-curve, and a plurality of smoothing coefficients.

[0015] In one embodiment, the 3D image data sampling module 130 may further receive corresponding 3D data of a plurality of pixels (e.g., from a 3D data storage element or a transmitter), and the 3D data may include at least one of geometric data, color data (e.g., color information), lighting data (e.g., light source information), or material data (e.g., surface scattering characteristics), but is not limited thereto in this specification. In one embodiment, the 3D image data sampling module 130 defines a line between the eyes and converts a plurality of output view numbers to viewing positions on the line between the eyes. The 3D image data sampling module 130 calculates ray vectors from the viewing positions to the plurality of pixels. Then, the 3D image data sampling module 130 performs 3D data sampling along the ray vectors according to the 3D data and the method of ray tracing 3D computer graphics (3DCG) to generate values of gray levels (e.g., in the range of 0 to 255) corresponding to the plurality of pixels. That is, the 3D image data sampling module 130 may generate gray level values according to the 3D data and the plurality of output view numbers to adjust the image data of the plurality of pixels.

[0016] In one embodiment, the display module 140 may be at least one of a liquid crystal (LCD) display module, an organic light emitting diode (OLED) display module, a quantum light emitting diode (QLED) display module, a mini light emitting diode (mini-LED) display module, or a micro light emitting diode (micro-LED) display module, but is not limited thereto in this specification. In one embodiment, the light modulator 150 may be at least one of a lenticular lens film, a liquid crystal (LC) gradient index (GRIN) lens, a parallax barrier, a liquid crystal (LC) parallax barrier, or a microlens array (MLA), but is not limited thereto in this specification.

[0017] To explain the modification operation of the present disclosure, it should be noted that the view curve corrector 120 is depicted as being coupled to the view generator 110 of FIG. 1. In some embodiments of the present disclosure, the view curve corrector 120 may be part of the view generator 110 or may be an independent module for modifying view numbers. When the view curve corrector 120 is part of the view generator 110, the view generator 110 generates the same view number as the view curve corrector 120, that is, the view generator 110 may directly generate a plurality of output view numbers.

[0018] In one embodiment, all pixels of the display module 140 may be divided into a plurality of pattern blocks, and one pattern block of the plurality of pattern blocks includes a plurality of pixels. That is, different pattern blocks correspond to different groups of input view numbers. For example, a plurality of input view numbers may be independently assigned to sub-pixels of a pattern block, and light vectors directed at target pixels of a plurality of pixels from a viewing position where eyes meet on a line of sight may be displayed.

[0019] FIG. 2 is a relationship diagram 20 of an original viewing position and a modified viewing position according to an embodiment of the present disclosure. The relationship diagram 20 may be used to realize the relationship between the plurality of input view numbers and the plurality of output view numbers of FIG. 1. In FIG. 2, in the case of 8 bits, the ranges of the original viewing position and the modified viewing position are -128 to 127. However, the present disclosure is not limited to the case of 8 bits. The original viewing position with a value of "0" is represented as the central position of the viewer's eyes. The original viewing positions with values from "-128" to "-1" are represented as the viewing positions of the viewer's right eye. The original viewing positions with values from "1" to "127" are represented as the viewing positions of the viewer's left eye. The original viewing position is rearranged to the modified viewing position (e.g., by the view curve corrector 120), and the modified viewing position and the original viewing position may be the same or different.

[0020] After correction, the corrected viewing position has fewer views (displays) than the original viewing position. Subsequently, the image with fewer views is displayed, and the viewer's eyes simultaneously see the image with fewer views. In this way, the effects of image blur can be reduced and the quality of the 3D image can be improved. Furthermore, the display device of this disclosure can provide the viewer with depth cues for eye accommodation and avoid the problem of vergence accommodation conflict (VAC).

[0021] According to Figure 2, the relationship between the original viewing position and the corrected viewing position has an S-shaped curve. The S-curve includes a line segment, which has a tilt SP1 for the right eye and a tilt SP2 for the left eye. Tilts SP1 and SP2 are less than 1 and may be the same.

[0022] Figure 3 is a diagram 30 illustrating the relationship between the original viewing position and the modified viewing position according to one embodiment of the present disclosure. Diagram 30 may be used to realize the relationship between multiple input view numbers and multiple output view numbers in Figure 1.

[0023] As shown in Figure 3, in the dotted areas 302, 304, and 306, the S-curve is modified by multiple smoothing coefficients 300. In other words, the multiple smoothing coefficients 300 smooth the S-curve to generate a smooth S-curve. Therefore, even when the viewer's head moves, they do not see discontinuous scenes or double images. The 3D visual effect of the image is improved.

[0024] In one embodiment, multiple smoothing coefficients 300 may be expressed by mathematical formulas. That is, the S-curve may be filtered by the mathematical formula to generate a smooth S-curve.

[0025] Figure 4 shows a viewing pattern 40 of a display module 140 and an optical modulator 150 according to one embodiment of the present disclosure. In Figure 4, the pixels of the display module 140 are for displaying an image to the viewer. For example, multiple viewing pixels VP1 display an image via the lens focusing area A1 of the optical modulator 150. Multiple viewing pixels VP2 display an image via the lens focusing area A2 of the optical modulator 150. Multiple viewing pixels VP3 display an image via the lens focusing area A3 of the optical modulator 150. It should be noted that multiple X-mark pixels XP within a viewing pixel may affect pixel blurring as they may provide the viewer with an undesirable extra view. The view curve corrector 120 can rearrange the X-mark pixels XP to viewing pixels VP1, VP2, or VP3. Thus, the rearranged X-mark pixels can display the desired image and reduce the phenomenon of crosstalk and / or image blurring.

[0026] Figure 5 is a relationship diagram 50 between the original viewing position and the modified viewing position according to one embodiment of the present disclosure. Relationship diagram 50 may be used to realize the relationship between multiple input view numbers and multiple output view numbers in Figure 1. The original viewing position is repositioned to the modified viewing position (for example, by the view curve corrector 120). The modified viewing position and the original viewing position are the same if the modified viewing position is in the viewing range VR1 of the viewer's right eye or the viewing range VR2 of the viewer's left eye. Otherwise, it will be the same as the nearest modified viewing position within the viewing range VR1 or viewing range VR2.

[0027] After correction, the corrected viewing positions within viewing ranges VR1 and VR2 will have the same view as the original viewing position. If the viewing position is not within viewing ranges VR1 or VR2, adjacent corrected viewing positions will have the same view. In this way, by eliminating extraneous viewing information, crosstalk and image blurring can be reduced, and the quality of 3D images can be improved.

[0028] According to Figure 5, the relationship between the original viewing position and the corrected viewing position has a double S-curve. The double S-curve includes a line segment, which has slopes SP1 and SP2. Slopes SP1 and SP2 are equal to 1. In one embodiment, the line segment has a slope, which is equal to zero.

[0029] Figure 6 is a relationship diagram 60 between the original viewing position and the modified viewing position according to one embodiment of the present disclosure. Relationship diagram 60 may be used to realize the relationship between multiple input view numbers and multiple output view numbers in Figure 1. The original viewing position is repositioned to the modified viewing position (for example, by the view curve modifier 120). The modified viewing position and the original viewing position may be the same or different.

[0030] After correction, the corrected viewing position will have fewer views (displays) than the original viewing position. Subsequently, the image with fewer views will be displayed, and the viewer's eyes will simultaneously see the image with fewer views.

[0031] As shown in Figure 6, the relationship between the original viewing position and the modified viewing position has a multi-S curve. The multi-S curve includes a line segment having slopes SP1, SP2, SP3, and SP4. Slopes SP1, SP2, SP3, and SP4 may be less than 1 and may be the same. In this disclosure, the line segment of the multi-S curve is not limited to having four slopes. It should be noted that the line segment of the multi-S curve may have fewer or more slopes, for example, more than three slopes.

[0032] In one embodiment, the display device 10 may provide images to multiple viewers according to the relationship diagram 60. For example, the display device 10 may generate a 3D visual effect by providing a first viewer with images at different viewing angles. A second viewer can also perceive a 3D visual effect according to the image, provided that the second viewer is close to the first viewer and shares the same line of sight as the first viewer.

[0033] Figure 7 is a schematic diagram of a viewing scenario 70 according to one embodiment of the present disclosure. In this embodiment, the display module 140 may be, but is not limited to, a mini-LED display module, a micro-LED display module, or a display module having a microlens array (MLA). According to Figure 7, the display module 140 includes a light source 700 and a pixel plane 702 on the st axis, and is viewed by a viewer 704. The 3D image data sampling module 130 may generate parameters for the center position VC of the viewer 704's eyes on the line of sight EL, according to the position of the viewer 704's eyes detected by the eye-tracking module 100. The 3D image data sampling module 130 generates parameters for the viewing position plane 706 on the st axis, corresponding to the pixel plane. That is, the view curve modifier 120 may be a 2D view curve modifier. The view curve modifier 120 receives a plurality of input view numbers (s,t) and generates a plurality of output view numbers (s,t).

[0034] In one embodiment, the st axis may be equal to the xy axis. In one embodiment, the relationship between a plurality of input view numbers and a plurality of output view numbers has a 2D S-curve, and the st axis may include two planes for the viewer's right eye and left eye, respectively. In one embodiment, the view curve modifier 120 may generate a plurality of output view numbers according to a plurality of input view numbers, a 2D S-curve, and a 2D lookup table. That is, the view curve modifier 120 may include a 2D lookup table. In one embodiment, the plane for the right eye and the plane for the left eye may have the same normal vector.

[0035] Figure 8 is a schematic diagram of a display device 80 according to one embodiment of the present disclosure. The display device 80 includes an eye-tracking module 100, a controller 802, a display module 140, and an optical modulator 150. The controller 802 assigns image data to multiple pixels of the display module 140 and includes a view generator 110, a view curve corrector 120, a 3D image data sampling module 130, and a black data insertion module 812. In detail, the black data insertion module 812 is coupled to the view generator 110 and the 3D image data sampling module 130 and receives multiple input view numbers from the view generator 110. The black data insertion module 812 generates multiple correction factors according to the multiple input view numbers and transmits the multiple correction factors to the 3D image data sampling module 130. The 3D image data sampling module 130 may adjust the image data of multiple pixels according to the multiple output view numbers and multiple correction factors generated by the view curve corrector 120. In other words, the display device 80 includes a black data insertion module 812 that corrects the light intensity of discontinuous view transition regions. Therefore, the phenomenon of crosstalk can be reduced, and the 3D visual effect of the image can be improved.

[0036] Figure 9 is a schematic diagram of a plurality of correction factors 90 according to one embodiment of the present disclosure. The plurality of correction factors 90 may be used to realize the plurality of correction factors generated by the black data insertion module 812 of Figure 8. According to Figure 9, when the view is an outside view or an inside view (for example, when the view is in a discontinuous view transition region), the value of the plurality of correction factors 90 is less than 1. When the view is neither an outside view nor an inside view (i.e., when the view is in a region close to the position of the right eye or the left eye), the value of the plurality of correction factors 90 is 1. That is, the viewer will see a darker image at the viewing position corresponding to the outside view or inside view.

[0037] In one embodiment, the insertion region (e.g., the outside view and inside view regions) may be 10% of the total view region. In one embodiment, the 3D image data sampling module 130 may modify the gray level value according to a plurality of correction coefficients 90 in order to adjust the image data for a plurality of pixels of the display module 140. In this way, the phenomenon of crosstalk and / or the problem of double images can be reduced, and the quality of the 3D image can be improved.

[0038] Figure 10 is a flowchart of process 1000 according to one embodiment of the present disclosure. Process 1000 is used by the display device 10 and includes the following steps.

[0039] Step 1002: Start

[0040] Step 1004: Generate multiple input view numbers according to multiple reference parameters.

[0041] Step 1006: Generate multiple input view numbers and multiple output view numbers following at least one S-curve.

[0042] Step 1008: Adjust the image data of multiple pixels according to the multiple output view numbers.

[0043] Step 10: Display at least one image according to multiple pixels and image data.

[0044] Step 1012: Finish

[0045] A detailed description and variations of Process 1000 can be found in the preceding description and are not described herein. Those skilled in the art should be able to easily combine, modify, and / or change the above description and examples.

[0046] In the example above, the phrase "from A to B" is a comprehensive description, meaning it includes both A and B.

[0047] In summary, this disclosure provides a display device and method equipped with 3D display technology. The display device modifies the view corresponding to the viewing position. In this way, image blurring due to the phenomenon of crosstalk can be reduced. Furthermore, the problem of double images and / or VAC can be solved. As a result, the quality of 3D images can be improved.

[0048] Furthermore, in order to determine whether the display device described herein is infringing, it would be necessary to analyze the structure of the display device in question and the performance of its 3D images using a camera or a special optical measurement system. Multiple photographs (e.g., consecutive images) would be taken by changing the angle and position of the camera. By analyzing these multiple photographs, it would be possible to determine how the position of the object's edges changes at each viewing angle. Based on these multiple photographs, it would be possible to determine whether the display device in question is infringing the display device described herein.

[0049] Those skilled in the art will readily understand that numerous modifications and changes can be made to the apparatus and method while maintaining the teachings of this disclosure. Accordingly, the above disclosure should be construed as being limited only by the appended claims. [Explanation of Symbols]

[0050] 10 Display device 100 Eye Tracking Modules 102 Controllers 110 View Generator 120 View Curve Corrector 130 3D Image Data Sampling Module 140 Display Modules 150 Optical modulators 80 Display device 802 Controller 812 Black Data Insertion Module

Claims

1. A view generator that generates multiple input viewing position numbers based on multiple reference parameters, A view curve modifier coupled to the view generator generates a plurality of output viewing position numbers according to the plurality of input viewing position numbers and at least one S-curve, In order to adjust the image data of multiple pixels according to the multiple output viewing position numbers, a three-dimensional (3D) image data sampling module is coupled to the view curve corrector, A display module connected to the 3D image data sampling module, which displays the plurality of pixels and at least one image according to the image data, Equipped with, A display device wherein the at least one S-shaped curve describes the relationship between the plurality of input viewing position numbers and the plurality of output viewing position numbers, and the view curve modifier modifies a plurality of first displays corresponding to the original viewing positions represented by the plurality of input viewing position numbers to generate a plurality of second displays corresponding to the modified viewing positions represented by the plurality of output viewing position numbers, wherein the number of the plurality of second displays is less than the number of the plurality of first displays.

2. The display device according to claim 1, wherein the plurality of reference parameters include a plurality of positions of the viewer's eyes, and the display device further comprises an eye-tracking module coupled to the view generator for tracking the plurality of positions of the viewer's eyes.

3. The display device according to claim 1, wherein the plurality of reference parameters include at least one optical parameter of an optical modulator, and the display device further comprises the optical modulator coupled to the display module for modulating a plurality of illumination directions of the plurality of pixels of the display module.

4. The display device according to claim 1, wherein the at least one S-shaped curve consists of a plurality of line segments, and the slope of at least one of the plurality of line segments is 1 or less.

5. The display device according to claim 1, wherein the at least one S-shaped curve consists of a plurality of line segments, and at least two of the plurality of line segments have the same slope.

6. The display device according to claim 1, wherein the at least one S-shaped curve consists of a plurality of line segments, and the slope of at least one of the plurality of line segments is equal to zero.

7. The display device according to claim 1, wherein the at least one S-shaped curve consists of a plurality of planes, and at least two of the plurality of planes have the same normal vector.

8. The display device according to claim 1, wherein the view curve corrector generates the plurality of output viewing position numbers according to the plurality of input viewing position numbers, the at least one S-curve, and the lookup table.

9. The display device according to claim 1, wherein the view curve corrector generates a plurality of output viewing position numbers according to the plurality of input viewing position numbers, the at least one S-curve, and a plurality of smoothing coefficients for smoothing the at least one S-curve by filtering it with a mathematical formula to generate a smooth S-curve.

10. The display device according to claim 1, wherein the 3D image data sampling module adjusts the image data of the plurality of pixels according to the plurality of output viewing position numbers and the plurality of correction coefficients, and the display device further comprises a black data insertion module coupled to the view generator and the 3D image data sampling module for generating the plurality of correction coefficients.

11. A method for improving the quality of three-dimensional (3D) images, The steps include generating multiple input viewing position numbers according to multiple reference parameters, The steps include generating a plurality of output viewing position numbers according to the plurality of input viewing position numbers and at least one S-curve, The steps include adjusting the image data of multiple pixels according to the multiple output viewing position numbers, A step of displaying at least one image according to the plurality of pixels and the image data, Includes, A method wherein the at least one S-curve describes the relationship between the plurality of input viewing position numbers and the plurality of output viewing position numbers, and a view curve modifier modifies a plurality of first displays corresponding to the original viewing positions represented by the plurality of input viewing position numbers to generate a plurality of second displays corresponding to the modified viewing positions represented by the plurality of output viewing position numbers, wherein the number of the plurality of second displays is less than the number of the plurality of first displays.

12. The method according to claim 11, wherein the plurality of reference parameters include a plurality of positions of the viewer's eyes, and the method further includes the step of tracking the plurality of positions of the viewer's eyes.

13. The method according to claim 11, wherein the plurality of reference parameters include at least one optical parameter of an optical modulator, and the method further includes the step of modulating a plurality of illumination directions of the plurality of pixels.

14. The method according to claim 11, wherein the at least one S-shaped curve consists of a plurality of line segments, and the slope of at least one of the plurality of line segments is 1 or less.

15. The method according to claim 11, wherein the at least one S-shaped curve consists of a plurality of line segments, and at least two of the plurality of line segments have the same slope.

16. The method according to claim 11, wherein the at least one S-shaped curve consists of a plurality of line segments, and the slope of at least one of the plurality of line segments is equal to zero.

17. The method according to claim 11, wherein the at least one S-shaped curve consists of a plurality of planes, and at least two of the plurality of planes have the same normal vector.

18. The method according to claim 11, further comprising the step of generating the plurality of output viewing position numbers according to the plurality of input viewing position numbers, the at least one S-curve, and a lookup table.

19. The method according to claim 11, further comprising the step of generating a plurality of output viewing position numbers according to the plurality of input viewing position numbers, the at least one S-curve, and a plurality of smoothing coefficients for smoothing the at least one S-curve by filtering it with a mathematical formula to generate a smooth S-curve.

20. The method according to claim 11, wherein the step of adjusting the image data of the plurality of pixels according to the plurality of output viewing position numbers includes the step of generating a plurality of correction coefficients and the step of correcting the image data of the plurality of pixels according to the plurality of output viewing position numbers and the plurality of correction coefficients.

Images