WO2019219092A1 - Procédé d'affichage de volume de type bitmap à translation circonférentielle à écran unique - Google Patents

Procédé d'affichage de volume de type bitmap à translation circonférentielle à écran unique Download PDF

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Publication number
WO2019219092A1
WO2019219092A1 PCT/CN2019/087739 CN2019087739W WO2019219092A1 WO 2019219092 A1 WO2019219092 A1 WO 2019219092A1 CN 2019087739 W CN2019087739 W CN 2019087739W WO 2019219092 A1 WO2019219092 A1 WO 2019219092A1
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WIPO (PCT)
Prior art keywords
imaging screen
screen
imaging
dimensional image
parallelogram mechanism
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PCT/CN2019/087739
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English (en)
Chinese (zh)
Inventor
李立新
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浙江大学
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Publication of WO2019219092A1 publication Critical patent/WO2019219092A1/fr

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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
    • H04N13/30—Image reproducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/30—Image reproducers
    • H04N13/363—Image reproducers using image projection screens

Definitions

  • the invention relates to a three-dimensional image display method, in particular to a single-screen circular translation bitmap volume display method.
  • the disclosed bitmap volume display method can be respectively assigned to three types: fixed-axis rotary type, reciprocating type and multi-screen translation type according to the number of imaging screens and the mechanical scanning movement mode thereof.
  • the fixed axis rotation type is shown in Fig. 1.
  • the advantage is that the inertial force is easy to balance, and the duty ratio of the display space and the duty ratio of the display time are maximized; the limitation is that the size and distribution of the voxels are not uniform, but linearly increases from the outer axis of the rotation, and thus Suitable for accurate display of 3D images.
  • the reciprocating movement is shown in Fig. 2.
  • the advantage is that voxels with uniform size and uniform distribution are allowed, so as to be suitable for accurate display of three-dimensional images, and the duty ratio of display space and display time are relatively large; the limitation is that the motion of the imaging screen is very large.
  • the reciprocating motion, the inertial force cannot be balanced, and the vibration and noise problems caused are difficult to overcome.
  • the multi-screen translation type is shown in Fig. 3.
  • Fig. 3 there are 2 to 6 parallel imaging images which are evenly distributed on the same circumference, and are circumferentially translated along the circumference, and sequentially appear in the field of view.
  • the advantage is that it allows voxels of uniform size and uniform distribution, so as to be suitable for accurate display of three-dimensional images, and the inertial force can be balanced; the limitation is that the duty ratio of display space and the duty ratio of display time are relatively small, especially driving The organization is more complicated.
  • the invention has an imaging screen for circumferential translation, and displays a two-dimensional image representing a cross section of the three-dimensional scene on the imaging screen, the bitmap information of the two-dimensional image and its display position on the imaging screen, according to the imaging screen
  • the real-time position is dynamically refreshed to form a parallel, time-division two-dimensional image sequence; with the visual persistence effect, the two-dimensional image sequence is perceived by the observer and restored to a three-dimensional scene.
  • a method for displaying a two-dimensional image representing a cross section of a three-dimensional scene on the imaging screen is generated by direct display; to achieve circular translation of the imaging screen, a first parallelogram mechanism is adopted, wherein the connecting rod and the imaging In order to achieve the balance with the inertial force of the first parallelogram mechanism, the first weight parallelogram mechanism with a crank arrangement of 180° is adopted, and the crank arrangement of 180° refers to the first weight parallelogram mechanism.
  • crank and the crank of the first parallelogram mechanism are arranged symmetrically on both sides to form a 180° arrangement, wherein the connecting rod is fixedly connected to the first weight; in order to ensure that the two-dimensional image displayed on the imaging screen falls exactly on the fixed imaging In space, it is necessary to make the offset of the display bitmap relative to the imaging screen equal to the amount of displacement of the imaging screen in the direction of the screen.
  • a method for displaying a two-dimensional image representing a cross section of a three-dimensional scene on the imaging screen is generated by projection imaging; and a mirror for circumferential translation is disposed on a projection light path from the fixed projector to the imaging screen.
  • the translation is performed along the circumferential path; between the mirror for the translation of the circumference and the imaging screen for the circumferential translation, a fixed mirror is installed to adjust the direction of the optical path;
  • the first parallelogram mechanism is adopted, in which the connecting rod is fixedly connected with the imaging screen; in order to achieve the balance of the inertial force with the first parallelogram mechanism, the first weight with the crank arranged at 180° is used in parallel.
  • the quadrilateral mechanism, the crank is 180°, which means that the crank of the first counterweight parallelogram mechanism and the crank of the first parallelogram mechanism are arranged symmetrically on both sides to form a 180° arrangement, wherein the connecting rod and the first weight are fixed.
  • a second parallelogram mechanism is adopted, in which the connecting rod is fixedly connected with the mirror; to achieve the flatness of the inertial force with the second parallelogram mechanism
  • the second counterweight parallelogram mechanism with a crank arrangement of 180° is adopted, and the crank arrangement of 180° means that the crank of the second counterweight parallelogram mechanism and the crank of the second parallelogram mechanism are symmetrically arranged on both sides.
  • the crank length of the first parallelogram mechanism must be twice the crank length of the second parallelogram mechanism, and the first parallelogram mechanism has one
  • the crank is fixed to a crank of the second parallelogram mechanism, so that the linear velocity of the mirror in the vertical mirror direction is always half of the linear velocity of the imaging screen in the vertical screen direction, thereby ensuring from fixing the projector to
  • the optical path between the imaging screens that are circularly moved remains unchanged, and a two-dimensional image with sharp focus, the same size, and a position just in the fixed imaging space is projected on the imaging screen.
  • the invention is similar to the reciprocating type and the multi-screen translation type.
  • the positions are parallel to each other, thereby allowing voxels of uniform size and uniform distribution, thereby being suitable for accurate display of three-dimensional images and display.
  • the three-dimensional image quality is inevitably better than the fixed-axis rotation type; secondly, compared with the reciprocating movement type, the invention avoids the reciprocating motion with large acceleration, and can realize the inertial force balance; compared with the multi-screen translation type, it is significantly simplified.
  • the drive mechanism is increased, and the duty ratio of the display space and the duty ratio of the display time are increased.
  • the invention is particularly suitable for accurate display of three-dimensional images, and has broad application prospects in the fields of industrial design, scientific research, teaching demonstration, medical CT analysis, spatial mechanism motion simulation and the like, involving three-dimensional image display.
  • 1 is a schematic diagram of a known method of setting a fixed-axis rotational bitmap volume.
  • FIG. 2 is a schematic diagram of a known reciprocating bitmap volume display method.
  • FIG. 3 is a schematic diagram of a known multi-screen translational bitmap volume display method.
  • FIG. 4 is a schematic diagram of a single screen circumferential translation bitmap volume display method of the present invention.
  • Fig. 5 is a view showing the state of the first embodiment of the present invention.
  • Figure 6 is a schematic view showing the state of the second embodiment of the present invention.
  • Fig. 7 is a second schematic view showing the state of the first embodiment of the present invention.
  • Figure 8 is a second schematic view of the second embodiment of the present invention.
  • the imaging screen 1 is a schematic diagram of a known method of setting a fixed-axis rotational bitmap volume.
  • the imaging screen 1 is rotated in a fixed axis, and the inertial force is easily balanced.
  • the imaging space of the imaging screen 1 (shown by gray shading, the same below) can be equivalent to the scanning space (shown by the hatching, the same below), and thus the display space is occupied.
  • the space ratio reaches a maximum of 100%; from the time duty cycle, a two-dimensional image is displayed at any time, and the duty ratio of time also reaches a maximum of 100%.
  • the size of the imaging screen 1 may be equal to the size of the two-dimensional cross-sectional image; if the two-dimensional cross-sectional image is rectangular, the three-dimensional imaging space is a cylinder.
  • the imaging screen 1 is reciprocatingly moved by the shifting speed, and the inertial force cannot be balanced. Considering that the acceleration at both ends is large, it is not conducive to imaging.
  • the imaging space of the imaging screen 1 is usually smaller than the scanning space, and thus the duty ratio of the display space.
  • the duty cycle with the display time is less than 100%.
  • the size of the imaging screen 1 may be equal to the size of the two-dimensional cross-sectional image; if the two-dimensional cross-sectional image is rectangular, the three-dimensional imaging space is a rectangular parallelepiped.
  • FIG. 3 is a schematic diagram of a known multi-screen translational bitmap volume display method, in which a solid black solid line indicates an imaging screen 1, and a circular dashed line indicates a path of three imaging screens 1 for circular translation, hatching
  • the area is a three-dimensional scanning space formed by the circular imaging of the three imaging screens 1
  • the area where the gray shadow is located is an imaging space formed by the three imaging screens 1 as a circular motion. It shows the case where the three imaging screens 1 are evenly distributed on the same circumference and sequentially enter the field of view.
  • the imaging space of the imaging screen 1 is much smaller than the scanning space, and when two imaging screens in the imaging space are alternated, the two-dimensional image cannot be displayed, and thus the duty ratio of the display space and the duty ratio of the display time Both are relatively small. If the imaging space is required to be a rectangular parallelepiped, the size of the imaging screen 1 must be larger than the size of the two-dimensional sectional image of the imaging space.
  • FIG. 4 is a schematic diagram of a single-screen circular translation bitmap volume display method of the present invention.
  • a thick black solid line indicates the imaging screen 1
  • a circular dotted line indicates a path of the imaging screen 1 for circular translation, and the section line is located.
  • the area is a three-dimensional scanning space formed by the circumferential translation of the imaging screen 1.
  • the area where the gray shadow is located is a three-dimensional imaging space formed by the imaging screen 1 and which can always display a three-dimensional scene.
  • an imaging screen 1 for circular translation a two-dimensional image representing a cross section of the three-dimensional scene is displayed on the imaging screen 1, and the bitmap information of the two-dimensional image and its display position on the imaging screen 1 are based on imaging
  • the real-time position of the screen 1 is dynamically refreshed to form a parallel, time-division two-dimensional image sequence; with the visual persistence effect, the two-dimensional image sequence is perceived and restored by the observer into a three-dimensional scene.
  • the imaging space of the imaging screen 1 is also smaller than the scanning space, but the duty ratio of the display space is larger than that of FIG. 3, and the duty ratio of the display time is the same as that of FIG.
  • the width of the imaging screen 1 is at least twice greater than the width of the two-dimensional cross-sectional image, that is, the horizontal horizontal length of the imaging screen 1 in FIG. 4 is at least greater than the horizontal shading length of the region in the figure. double.
  • FIG. 5 and FIG. 7 are the first embodiment of the present invention.
  • a thick black solid line indicates the imaging screen 1
  • a circular dotted line indicates a path in which the imaging screen 1 is circumferentially translated.
  • the area where the hatching is located is the imaging screen 1.
  • the three-dimensional scanning space formed by the circumferential translation, the area where the gray shadow is located is a three-dimensional imaging space formed by the imaging screen 1 under the circumferential translation, which can always display the three-dimensional scene.
  • a method for displaying a two-dimensional image representing a cross section of a three-dimensional scene on the imaging screen 1 is generated by direct display; to realize the circumferential translation of the imaging screen 1, a first parallelogram mechanism ABCD is adopted,
  • the rod BC is fixedly connected to the imaging screen 1; in order to achieve the balance of the ABCD inertia force with the first parallelogram mechanism, the first weight parallelogram mechanism AB'C'D with the crank arranged at 180° is used, wherein the rod B'C' is fixed with the first weight 1'; in the specific implementation, the link B'C' and the first weight 1' can be directly decomposed to point B' and point C', becoming two An independent weight; in order to ensure that the two-dimensional image displayed on the imaging screen 1 falls exactly in the fixed imaging space, the offset of the display bitmap relative to the imaging screen must be equal to the displacement of the imaging screen in the direction of the screen. .
  • FIG. 6 and FIG. 8 are a second embodiment of the present invention.
  • the solid black solid lines respectively represent the imaging screen 1/mirror 2
  • the circular dotted line indicates the path of the imaging screen 1/mirror 2 for circumferential translation.
  • the area corresponding to the section line of the imaging screen 1 is a three-dimensional scanning space formed by the circular motion of the imaging screen 1.
  • the gray shading area corresponding to the imaging screen 1 is a three-dimensional scene formed by the imaging screen 1 and can be displayed under the circular motion.
  • the area corresponding to the section line of the mirror 2 is a three-dimensional moving space formed by the mirror 2, and the corresponding gray shading area of the mirror 2 is the reflection projection formed by the mirror 2 under the circular motion.
  • a method of displaying a two-dimensional image representing a cross section of a three-dimensional scene on the imaging screen 1 is generated by projection imaging; and a circumferential translation is provided on a projection light path from the fixed projector 4 to the imaging screen 1.
  • the circumferential translation of 1 adopts the first parallelogram mechanism ABCD, in which the connecting rod BC is fixedly connected to the imaging screen 1; in order to achieve the balance of the inertial force of the ABCD with the first parallelogram mechanism, the crank is arranged at 180°.
  • the first counterweight parallelogram mechanism wherein the connecting rod is fixedly connected to the first weight (similar to the structure of Fig. 5, not shown in Fig. 6); in order to realize the circular translation of the mirror 2, the first Two parallelogram mechanisms AEFG, wherein the connecting rod EF is fixedly connected with the mirror 2; in order to achieve the balance of the inertial force of the AEFG with the second parallelogram mechanism, a second counterweight parallelogram mechanism with a crank arrangement of 180° is used. , the connecting rod and the first A counterweight secured (FIG. 5 and similar structure, not shown in FIG. 6).
  • the imaging light emitted by the projector 4 is sequentially reflected by the mirror 2, reflected by the fixed mirror 3, and then irradiated onto the imaging screen 1.
  • the embodied imaging screen 1 may be a white screen but is not limited thereto.
  • of the first parallelogram mechanism ABCD must be twice the crank length
  • the diameter of the circumference is twice, and the first parallelogram mechanism has a crank AB fixed to a crank AE of the second parallelogram mechanism, so that the linear velocity of the mirror 2 in the vertical mirror direction is always maintained as an image screen.
  • the first parallelogram mechanism has a crank AB and a crank AE of the second parallelogram mechanism is vertically fixed at 90°, but the specific implementation is not limited to this 90° vertical, and may be other Any angle of attachment.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
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Abstract

L'invention concerne un procédé d'affichage de volume de type bitmap à translation circonférentielle à écran unique. Un écran d'imagerie selon l'invention effectue un mouvement de translation circonférentielle; une image bidimensionnelle représentant une section transversale d'une scène tridimensionnelle est affichée sur l'écran d'imagerie; et des informations bitmap de l'image bidimensionnelle et la position d'affichage de l'image bidimensionnelle sur l'écran d'imagerie sont rafraîchies de manière dynamique en fonction de la position en temps réel de l'écran d'imagerie, de manière à former une séquence d'images bidimensionnelles à répartition dans le temps ayant des images parallèles; au moyen d'un effet de persistance visuelle, la séquence d'images bidimensionnelle est perçue et rétablie dans une scène tridimensionnelle par un observateur. Par rapport au procédé d'affichage dans l'état de la technique, la présente invention simplifie considérablement le mécanisme d'entraînement et améliore le rapport cyclique de l'espace d'affichage et le rapport cyclique du temps d'affichage dans le but de garantir des voxels uniformes et d'obtenir un équilibre de force d'inertie. Par conséquent, la présente invention est particulièrement appropriée pour un affichage précis d'images tridimensionnelles, et présente de larges perspectives d'application dans le domaine concernant un affichage d'image en trois dimensions, telles que la conception industrielle, la recherche scientifique, la présentation d'enseignement, l'analyse de scanographie médicale et la simulation de mouvement de mécanisme spatial.
PCT/CN2019/087739 2018-05-17 2019-05-21 Procédé d'affichage de volume de type bitmap à translation circonférentielle à écran unique WO2019219092A1 (fr)

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CN201810474872.X 2018-05-17
CN201810474872.XA CN108769663B (zh) 2018-05-17 2018-05-17 单屏圆周平动位图式体积显示方法

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CN108769663B (zh) * 2018-05-17 2020-03-17 浙江大学 单屏圆周平动位图式体积显示方法

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