Slice image editing method and projection device

Abstract

The present invention discloses a method for editing slice images and a projection device, wherein the projection device includes an image source carrier, a lens array, a light source array, and a circuit board; the image source carrier is provided with slice images distributed in an array, the light source array is located on one side of the image source carrier, the light source array is electrically connected to the circuit board, and the lens array is located on the other side of the image source carrier, and the slice images in the image source carrier are projected onto a target screen in time sequence through the projection device. The present invention can use an existing LCD display screen as an image source carrier, and without reducing the original grayscale and color performance of the LCD display screen, without increasing the refresh rate, and without increasing the amount of additional data for storage and transmission, by adjusting the image editing method and coordinating the LED array and the lens array, a high frame rate projection image required for volumetric three-dimensional display is generated, the design is simple and easy, the manufacturing cost is low, and the image source data is easy to edit, creating conditions for the popularization and application of volumetric three-dimensional display.

Description

Technical Field

[0001] The present invention relates to the technical field of volumetric three-dimensional display, and in particular to a slice image editing method and a projection device. Background Art

[0002] Volumetric three-dimensional display is a stereoscopic display technology. Based on this display technology, three-dimensional images with physical depth of field can be directly observed. In volumetric three-dimensional display technology, it is necessary to display slice images with high frame rate on a moving screen, and use the visual persistence and visual fusion principles of the human eye to form a three-dimensional picture. In order to produce high-frame rate images, the current main research directions are active light-emitting LED moving screens and passive light-emitting DMD-based high-frame rate images projected onto moving screens. Due to its own weight, the LED moving screen will cause structural instability under high-speed movement conditions, and it is impossible to achieve a large-scale three-dimensional display space. In addition, a single LED light point is limited by its inherent size and cannot produce smaller pixels, which affects the image quality. The pixel points of DMD projection technology are a large number of micro-mirrors, which rely on directional vibration to reflect light to produce grayscale and color to form images. Both technologies rely on sacrificing grayscale to improve the image refresh rate, resulting in unsatisfactory imaging color and grayscale. In addition, both technologies require massive data storage and transmission, which increases the difficulty and cost of design and manufacturing, and are not easy to popularize. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a slice image editing method and projection device, and the specific scheme is as follows:

[0004] A method for editing a slice image comprises the following steps:

[0005] Distribute N slice images required to form a volumetric three-dimensional image in an array in an image source carrier for imaging;

[0006] The slice images in the image source carrier are projected onto a target screen in time sequence by a projection device.

[0007] Preferably, the imaging position, size and shape of the slice image in the image source carrier are corrected accordingly according to the final displacement, size and shape deviation on the target screen.

[0008] A projection device for slice images:

[0009] It includes an image source carrier, a lens array, a light source array, and a circuit board;

[0010] The image source carrier has N slice images required for forming a three-dimensional image in an array distributed image;

[0011] The light source array is located on one side of the image source carrier, so that the image source carrier is located in the light emitting direction of the light source array, the light source array includes a plurality of point light sources for illuminating the sliced ​​image in the image source carrier, and the distribution mode of the point light sources matches that of the image source carrier; the light source array is electrically connected to the circuit board, and the lighting and extinguishing of the point light sources in the light source array are controlled by the circuit board;

[0012] The lens array is located on the other side of the image source carrier. The lens array includes a plurality of lenses for magnifying slice images, and the distribution of the lenses matches that of the image source carrier.

[0013] Preferably, it further includes a first shading grid, which is located between the image source carrier and the light source array, and is provided with light-transmitting holes matching the point light sources in the light source array to ensure that the point light sources only illuminate the corresponding slice images.

[0014] Preferably, it also includes a second shading grid, which is located between the image source carrier and the lens array, and the second shading grid is provided with light-transmitting holes matching the point light sources in the light source array to ensure that each slice image is only received by the corresponding lens.

[0015] Preferably, the focal lengths of the lenses in the lens array are different to ensure that each slice image can be clearly projected on the target screen.

[0016] The present invention can utilize the existing LCD display screen, without reducing the original grayscale and color expression of the LCD display screen, without increasing the refresh rate, and without increasing the amount of extra data for storage and transmission. By adjusting the image editing method and coordinating the LED array and the lens array, a high frame rate projection image required for volumetric three-dimensional display is generated. The design is simple and easy, the manufacturing cost is low, and the image source data is easy to edit. The present invention can be applied to a slice-type projection imaging system, a multi-imaging screen projection imaging system, or a spiral screen projection imaging system, creating conditions for the popularization and application of volumetric three-dimensional display. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 It is a schematic top view of an image source carrier according to an embodiment of the present invention;

[0019] Figure 2 It is a longitudinal sectional schematic diagram of an embodiment of the present invention;

[0020] Figure 3This is a schematic diagram of the projection principle of an embodiment of the present invention;

[0021] Figure 4 This is a common polarity change method for LCD displays. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the slice projection imaging system, the moving screen performs linear reciprocating motion, spiral motion, or rotational motion to scan a three-dimensional imaging space. During the movement of the moving screen, the high-speed projection device sequentially projects N two-dimensional slices of a three-dimensional object onto the moving screen. The moving screen acts as a target screen at different positions to receive these slice images, forming a "slice stack" including N slice images in the real three-dimensional space. If the speed of the moving screen is fast enough, and the number of slices N projected by the high-speed projection device is large enough, due to the persistence of vision effect, the human eye can perceive a three-dimensional image with real physical depth in the imaging space.

[0024] The present invention provides a method for editing a slice image, comprising the following steps:

[0025] Distribute N slice images required to form a volumetric three-dimensional image in an array in an image source carrier for imaging;

[0026] The slice images in the image source carrier are projected onto a target screen in time sequence by a projection device.

[0027] like Figure 1 As shown, the present invention also provides a slice image projection device, including an image source carrier 1, a light source array 2, a circuit board 3, and a lens array 4;

[0028] Combination Figure 2 As shown, the image source carrier 1 may be a film, an LCD display screen or an LCD projection chip, and the N slice images 101 required to form a volumetric three-dimensional image are array-distributed and imaged on the image source carrier 1;

[0029] The light source array 2 is located on one side of the image source carrier 1, so that the image source carrier 1 is located in the light emitting direction of the light source array 2. The light source array 2 includes a plurality of point light sources 201 for illuminating the slice image 101 in the image source carrier 1. In this embodiment, the point light sources 201 are luminous LED patches, and the distribution mode of the point light sources 201 matches that of the image source carrier 1. The light source array 2 is electrically connected to the circuit board 3, and the circuit board 3 and its single-chip microcomputer are used to control the lighting and extinguishing of the point light sources 201 in the light source array 2.

[0030] The lens array 4 is located on the other side of the image source carrier 1 . The lens array 4 includes a plurality of lenses for magnifying the slice image 101 , and the distribution of the lenses matches that of the image source carrier 1 .

[0031] As an improvement of the above-mentioned embodiment, it also includes a first shading grid 5 composed of shading material, wherein the first shading grid 5 is located between the image source carrier 1 and the light source array 2, and the first shading grid 5 is provided with light-transmitting holes matching the point light sources 201 in the light source array 2 to ensure that the point light sources 201 only illuminate the corresponding slice image 101.

[0032] As an improvement of the above-mentioned embodiment, it also includes a second shading grid 6 composed of shading material, and the second shading grid 6 is located between the image source carrier 1 and the lens array 4. The second shading grid 6 is provided with light-transmitting holes matching the point light sources 201 in the light source array 2 to ensure that each slice image 101 is only received by the corresponding lens.

[0033] like Figure 3 As shown, the slice image projection device provided by this embodiment has an image source carrier 1 arranged in an x*y array, and slice images 101 are imaged in the image source carrier 1. The light source array under the control of the circuit board sequentially lights up the point light sources (x, y) therein according to the programmed order, and the slice image 101 corresponding to the point light source is projected onto the target screen at time tn.

[0034] As an improvement of the above solution, the imaging position, size and shape of the slice image 101 in the image source carrier are corrected accordingly according to its final displacement, size and shape deviation on the target screen (after projection imaging).

[0035] In this embodiment, the focal lengths of the lenses in the lens array 4 are different to ensure that each slice image 101 can be clearly projected on the moving target screen.

[0036] The driving voltage of the liquid crystal molecules in the LCD display must undergo a polarity change, which requires that the display voltage in the liquid crystal display be divided into two polarities, one is positive and the other is negative. When the voltage of the display electrode is higher than the common electrode voltage, it is called positive polarity; when the voltage of the display electrode is lower than the common electrode voltage, it is called negative polarity. Regardless of whether it is positive or negative polarity, there will be a set of grayscales with the same brightness, so when the absolute value of the pressure difference between the upper and lower layers of glass is fixed, the grayscale displayed is exactly the same. However, in these two cases, the direction of rotation of the liquid crystal molecules is completely opposite, which can avoid the above-mentioned characteristic destruction caused when the direction of the liquid crystal molecules is always fixed in one direction. There are four common polarity conversion methods, namely frame-by-frame inversion, row-by-row inversion, column-by-column inversion and point-by-point inversion, such as Figure 4 Therefore, when the polarity conversion mode of the LCD display screen is "frame-by-frame inversion", the whole frame of all slice images can be stably imaged within the same limited time, making it possible for the present invention to use the LCD display screen as an image source carrier.

[0037] In addition, the slice image editing method and projection device provided by the embodiment of the present invention can also be applied in the field of animation, that is, imaging the object frame by frame on the image source carrier, and controlling continuous playback through the circuit board to form a moving image.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A slice image projection device, characterized in that: It includes an image source carrier, a lens array, a light source array, and a circuit board; The image source carrier has N slice images required for forming a three-dimensional image in an array distributed image; The light source array is located on one side of the image source carrier, so that the image source carrier is located in the light emitting direction of the light source array, the light source array includes a plurality of point light sources for illuminating the slice image in the image source carrier, and the distribution mode of the point light sources matches that of the image source carrier, and the point light sources correspond to the slice image one by one; the light source array is electrically connected to the circuit board, and the lighting and extinguishing of the point light sources in the light source array are controlled by the circuit board; The lens array is located on the other side of the image source carrier, and the lens array includes a plurality of lenses for magnifying the slice image, and the distribution of the lenses matches that of the image source carrier; It also includes a first light shielding grid, which is located between the image source carrier and the light source array, and is provided with light-transmitting holes that match the point light sources in the light source array to ensure that the point light sources only illuminate the corresponding slice image; It also includes a second shading grid, which is located between the image source carrier and the lens array. The second shading grid is provided with light-transmitting holes matching the point light sources in the light source array to ensure that each slice image is only received by the corresponding lens.

2. The slice image projection device according to claim 1, characterized in that: The focal lengths of the lenses in the lens array are different to ensure that each slice image can be clearly projected on the target screen.

3. Application of the slice image projection device as described in claim 1 in the field of animation.

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