WO2019127570A1 - Procédé permettant d'acquérir une image de projection rectangulaire maximale au cours d'une correction de trapèze d'unité de projection - Google Patents

Procédé permettant d'acquérir une image de projection rectangulaire maximale au cours d'une correction de trapèze d'unité de projection Download PDF

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Publication number
WO2019127570A1
WO2019127570A1 PCT/CN2017/120396 CN2017120396W WO2019127570A1 WO 2019127570 A1 WO2019127570 A1 WO 2019127570A1 CN 2017120396 W CN2017120396 W CN 2017120396W WO 2019127570 A1 WO2019127570 A1 WO 2019127570A1
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WO
WIPO (PCT)
Prior art keywords
vertex
projected image
projection
coordinates
reference vertex
Prior art date
Application number
PCT/CN2017/120396
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English (en)
Chinese (zh)
Inventor
那庆林
麦浩晃
黄彦
Original Assignee
神画科技（深圳）有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 神画科技（深圳）有限公司 filed Critical 神画科技（深圳）有限公司
Priority to PCT/CN2017/120396 priority Critical patent/WO2019127570A1/fr
Publication of WO2019127570A1 publication Critical patent/WO2019127570A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]

Definitions

  • the trapezoidal correction unit converts the image to be projected according to the deflection angle of the projection lens optical axis with respect to the lower, left and right directions of the projection display surface, thereby realizing automatic compensation of the deformation of the projection image.
  • the technical problem to be solved by the present invention is to provide a projection image transformation algorithm capable of acquiring a maximum rectangular projection image during the trapezoidal correction of the projection unit.
  • a positional relationship between the maximum rectangular projected image and the current projected image includes: a position of the reference vertex in the maximum rectangular projected image is consistent with a position of the reference vertex in the current projected image; the reference vertex is at a maximum
  • the diagonal vertices in the rectangular projected image are located on the side of the current projected image that is opposite the reference vertices.
  • the step of establishing a relationship including a maximum rectangular side length according to a positional relationship between the maximum rectangular projected image and the current projected image, and the step of obtaining a maximum rectangular side length includes:
  • the method further includes: obtaining a side length of each side of the current projected image according to coordinates of each vertex of the current projected image;
  • the step of establishing a relationship including a maximum rectangular side length according to a positional relationship between the maximum rectangular projected image and the current projected image, and the step of obtaining a maximum rectangular side length includes:
  • the maximum rectangular side length is obtained according to the proportional relationship and the aspect ratio of the largest rectangle.
  • the aspect ratio of the largest rectangle is set to a constant value.
  • the reference vertex coincides with the reference vertex, or the distance between the reference vertex and the reference vertex is less than one tenth of the length of the long side passing through the reference vertex in the current projected picture.
  • the reference vertex is the lower right corner vertex of the current projected picture.
  • the reference vertex is the lower left corner vertex of the current projected picture.
  • the reference vertex is the upper right corner vertex of the current projected picture.
  • the reference vertex is the upper left corner vertex of the current projected picture.
  • the invention determines the maximum rectangular projection image reference vertex coordinates by the position and posture of the projection unit and the deflection direction, and establishes a relationship including the maximum rectangular side length according to the positional relationship between the maximum rectangular projection image and the current projection image, and obtains the maximum rectangular side length, and finally according to the reference.
  • the vertex coordinates and the maximum rectangle side length can determine the coordinates of each vertex of the largest rectangular projection image, thereby obtaining the largest rectangular projection image to ensure the best viewing effect for the user.
  • the four vertex coordinates of the trapezoid A 1 B 1 C 1 D 1 of the current projection image can be obtained through perspective transformation, and the side lengths of the four sides can be further determined according to the coordinates of the four vertexes.
  • the side A 1 B 1 is a
  • the side C 1 D 1 is b
  • the bottom A 1 D 1 is l
  • the corrected rectangle ABCD is w.
  • the height is h
  • the aspect ratio is a fixed value, according to the user's viewing habits, for example, 16:9.
  • FIG. 4 (a) through FIG diagonal of the rectangle BD longest point D 1 D is a 1:00 current reference vertex of the projected image, the maximum reference vertex point D rectangular projection image, D and D coincide.
  • point When B is on the straight line B 1 C 1 the area of the rectangular ABCD is the largest.
  • the vertices D of the rectangle ABCD coincide with D 1 , and the coordinates of the D point are known.
  • the plane coordinates of the other vertices of the rectangle ABCD can be obtained, and the space of the rectangle ABCD can be obtained according to the deflection angle of the projection unit.
  • the coordinates can be obtained by inverse perspective transformation to obtain the coordinates of each vertex of the corrected image, and the maximum rectangular projection image can be acquired.
  • the relationship including the maximum rectangular side length is established according to the positional relationship between the maximum rectangular projection image and the current projected image, and the maximum rectangular side length is obtained.
  • the maximum rectangular side length is obtained according to the proportional relationship.
  • the horizontal deflection to the left in the vertical direction is taken as an example.
  • the current projected image is shown in Fig. 2(b)
  • the corrected maximum rectangular projected image is shown in Fig. 3(b).
  • the four vertex coordinates of the current projection image quadrilateral A 1 B 1 C 1 D 1 can be obtained through perspective transformation.
  • the corrected maximum rectangle ABCD width is w
  • the height is h
  • the aspect ratio is fixed
  • the diagonal BD direction vector No change when the rectangular diagonal BD is the longest, the rectangular ABCD area is the largest.
  • FIG. 4 (b) through FIG diagonal of the rectangle BD longest point D 1 D is a 1:00 current reference vertex of the projected image, the maximum reference vertex point D rectangular projection image, D and D coincide.
  • point When B is on the straight line B 1 C 1 the area of the rectangular ABCD is the largest.
  • the above method is also applicable to the case where the projection unit is only deflected horizontally with respect to the projection display surface.
  • the deflection angle in the vertical direction is 0; therefore, when the projection unit is deflected relative to the projection display surface, including simultaneous occurrence
  • the vertical direction and the horizontal direction are deflected, only the horizontal direction deflection occurs, or the vertical direction deflection angle is not too large, a relationship including the maximum rectangular side length is established according to the positional relationship between the maximum rectangular projected image and the current projected image, and the maximum rectangular side length is obtained.
  • the process includes the following steps:
  • This embodiment is the same as the second embodiment, and the step of obtaining the maximum rectangle is the same as that of the second embodiment.
  • the projection unit has different deflection directions.
  • the projection unit is vertically downward and horizontally deflected to the right.
  • the projection display image is as shown in FIG. 2(c), and the corrected projection image is as shown in FIG. 3(c).
  • the coordinates of point A are obtained as (x 3 -k*h, y 3 -h).
  • the point A must be on the line A 1 D 1 , so the point A should satisfy the equation of the line A 1 D 1 .

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

La présente invention appartient au domaine technique de la projection, et concerne un procédé permettant d'acquérir une image de projection rectangulaire maximale au cours d'une correction de trapèze d'unité de projection. Le procédé consiste à : sélectionner un sommet de référence d'une image de projection actuelle selon une posture de position et une direction de déviation d'une unité de projection ; régler des coordonnées du sommet de référence en tant que coordonnées d'un sommet de référence de l'image de projection rectangulaire maximale ; établir une expression relationnelle contenant un côté rectangle maximal selon une relation de position entre l'image de projection rectangulaire maximale et l'image de projection actuelle, et la résolution du rectangle maximal ; et obtenir les coordonnées de chaque sommet de l'image de projection rectangulaire maximale selon les coordonnées du sommet de référence et du côté rectangle maximal. Au moyen du procédé, l'image de projection rectangulaire maximale peut être obtenue de façon à garantir l'effet de visualisation de film optimal pour un utilisateur.
PCT/CN2017/120396 2017-12-30 2017-12-30 Procédé permettant d'acquérir une image de projection rectangulaire maximale au cours d'une correction de trapèze d'unité de projection WO2019127570A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/120396 WO2019127570A1 (fr) 2017-12-30 2017-12-30 Procédé permettant d'acquérir une image de projection rectangulaire maximale au cours d'une correction de trapèze d'unité de projection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/120396 WO2019127570A1 (fr) 2017-12-30 2017-12-30 Procédé permettant d'acquérir une image de projection rectangulaire maximale au cours d'une correction de trapèze d'unité de projection

Publications (1)

Publication Number Publication Date
WO2019127570A1 true WO2019127570A1 (fr) 2019-07-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114727081A (zh) * 2022-06-09 2022-07-08 深圳新智联软件有限公司 投影仪投影校正方法、装置及投影仪

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5465121A (en) * 1993-03-31 1995-11-07 International Business Machines Corporation Method and system for compensating for image distortion caused by off-axis image projection
CN102611822A (zh) * 2012-03-14 2012-07-25 海信集团有限公司 投影仪及其投影图像校正方法
CN105554486A (zh) * 2015-12-22 2016-05-04 Tcl集团股份有限公司 一种投影校正方法和装置
CN106657953A (zh) * 2016-11-22 2017-05-10 江苏轩博电子科技有限公司 一种投影仪自动梯形校正系统
CN107147888A (zh) * 2017-05-16 2017-09-08 深圳市火乐科技发展有限公司 一种利用图形处理芯片自动校正失真方法和装置
CN107343186A (zh) * 2017-06-13 2017-11-10 北京小米移动软件有限公司 投影设备控制方法及装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5465121A (en) * 1993-03-31 1995-11-07 International Business Machines Corporation Method and system for compensating for image distortion caused by off-axis image projection
CN102611822A (zh) * 2012-03-14 2012-07-25 海信集团有限公司 投影仪及其投影图像校正方法
CN105554486A (zh) * 2015-12-22 2016-05-04 Tcl集团股份有限公司 一种投影校正方法和装置
CN106657953A (zh) * 2016-11-22 2017-05-10 江苏轩博电子科技有限公司 一种投影仪自动梯形校正系统
CN107147888A (zh) * 2017-05-16 2017-09-08 深圳市火乐科技发展有限公司 一种利用图形处理芯片自动校正失真方法和装置
CN107343186A (zh) * 2017-06-13 2017-11-10 北京小米移动软件有限公司 投影设备控制方法及装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114727081A (zh) * 2022-06-09 2022-07-08 深圳新智联软件有限公司 投影仪投影校正方法、装置及投影仪

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