TW200419295A - Method for electronic adjustment of the geometry in a videoprojector used in back projection and a videoprojector utilizing the method thereof - Google Patents

Abstract

Method and videoprojector using such a method for adjusting the geometry of an image produced starting from a digital video signal projected on a screen by a videoprojector, in particular used in back projection, comprising: entering a mode provided for electronic adjustment of the geometry of the image; controlling, through control elements associated to the videoprojector, the electronic adjustment means that operate distortions on the digital video signal to be projected; bringing each apex of the image to coincide with a respective apex of the screen by means of the distortions operated by said electronic adjustment means on the digital video signal.

Description

200419295 V. Description of the invention (1) [Technical Field] The present invention relates to a method for geometrically adjusting a projected image and an image projector using the method, which is an image projector, especially an image projection used for reverse projection. Method of adjusting geometry in the machine, and image projector using this method. [Prior technology] The simultaneous use of mechanical miniaturization and semiconductor-specific technologies has led the manufacture of small electromechanical systems. Such small electromechanical systems, such as DMD (digital micro, mirror element), LCD (liquid crystal display) & LC〇s ( (Reflective LCD projection display), is widely used in small and light image projection || The image projector can be used in a forward projection or back projection configuration, such as a single image projector or a so-called projection wall (videowall, which consists of several The reverse projector forms an image wall horizontally and vertically to obtain a large screen (max i -screens). 〇In the reverse camera, the image is projected onto a panel (such as deleting卞 * A screen composed of light focused by the system and transmitted directly or through a mirror to a Fresnel lens. In the forward projection, the light source is located on the face and the light source is on the face of the admirer. It is on the same side, but is used in back projection. The user and the first source are on the opposite side. When the image formed on the panel shows 5 geometric distortion (geometric dlst〇rtin), usually Will understand the influence of uistortlons, such as

200419295 V. Description of the invention (2) Rotation of vertical axis and / or horizontal axis, rectangles, irregular neutral and / or horizontal irregularities on the screen. , ▲, dots, and the image size are too large or too small. Some distortions are basically caused by the fixed positioning device, screen, and related fixed: f shadow system, lens panel alignment of the image projector, etc. different ^ 1 force, σ mirror surface Among the distortions of the azimuth and image projector, the most obvious influence is caused by two: tolerances (tolerances), which are in accordance with the rectangle of the screen. : ~ The sides and vertices of the rectangle are not the projectors that can be used in the reverse projector. The projector must be able to execute freely. 丄, due to the correct image orientation, the orthogonal coordinate axes X, Y, and z are driven by Each of the three periods of movement V is completely white, and three types of rotation are in three directions. Since the image projectors are separate, the image positioning of the X, γ, and Z axes will necessarily require at least two people: 1 ::: of Reverse side, adjustment: If the image projector is locked or loosened, the screen gives useful adjustment instructions. In this way, people directly watch or perform complicated operations, which is time-consuming and expensive. Η 会 疋 -Item phase§

" According to the Italian patent No. 1713〇8864, the aforementioned shortcomings can be solved by implementing independent mechanical adjustments with /, motor-driven and remote monitoring operation, a single installer can be in front of the screen Adjust the image on the screen; however, this system based on mechanical adjustment still has some notable disadvantages: such as high cost and the weight of the support base with three movable plates. Recently, some industry players have proposed other adjustment systems, which use electronic circuits to process images based on integrated circuits, such as LISEEGANG ELECTRONICS

Η INVENT20031202PI34.ptd Page 7 200419295 V. Description of the invention (3) _ (LE) 3G and SILl of (Π) ⑽ sxwi of qptix; For the kind of tuning I, the above-mentioned image has satisfactory geometric correction. Reason: Talent: Because some adjustments are dependent on each other, it is necessary to repeat the adjustment several times. [Πί The complex operation takes a long time. 5 、 The main purpose of 5:? Is to provide the electronic adjustment method of a kind of geometry, especially the electrical disadvantages of the geometry in the reverse projection system, and to ensure that the image on the screen is fast敕 π A f ΐ Full and accurate positioning of the palindrome, with the same text :: Chacha 'takes a relatively short time and a relatively low cost. As in the case of ^ 2 2 1, it is used to provide shadows for use in back projection. The above adjustment method has the same advantages.

It is used in the electronic adjustment method system, starting from the-image projector, especially using the J-signal of the image projector in reverse projection, including the following: ^ On-screen ^ digital video geometric electronic adjustment ·· Enter the deformation of the video signal provided by the camera as an electronic adjustment means for the control of the video control. The deformation of the video signal is the most; the deformation of the digital segment projected by the electric segment operation makes the scene digital. ~ The vertex of the mother of the image is the same as the corresponding vertex of the screen. 上 上 Ϊ: ΐ :: ί ΐThe image projector in the reverse projection is on the screen and the whole, "make the projection on the screen reach the appropriate steps in the straight method. The parameters are reached: the characteristics of the electronic processing and the method of adjustment according to the present invention are based on the implemented steps,

ZUU41 ^ 295 5 Description of the invention (4) ^ Description provided by the operating device Keep it simple and fast: 3: 3 u up to a certain number of keys, which can be confirmed or specified, and experience. Operator, * $ The operator must have special capabilities. [Implementation method] Camera (not shown in the figure: f electronic adjustment method, see Figure-how the image is distorted, π history is projected on a rectangular screen (1) Out image due to several

A, B: The vertices of the 'A'-, C ,, ... of the Gang's phase; should ;; points L, D are not consistent. The adjustment method according to the present invention provides the following steps: First, a digital video signal is required. + Then, follow the general procedure to enter the "geometry adjustment mode" of the image projector, for example, press a specific button on the remote monitor (remote c〇ntr〇i) or call the directory on the screen and move the cursor to review Directory until you reach the "Geometry adjustment" item. Press the specific button on the remote monitor of the image projector, for example, use the symbol "+" or the text "Continue (go 〇n)" as a mark to start the adjustment mode; a light-emitting indicator (3), one or more letters , Digital or graphic symbols, displayed near a vertex of the image (2) (such as vertex A 'in the first image), indicating where the operator should start calibration. By activating the direction buttons "high, low, right, left" provided on the image projector or remote monitoring, the adjustment is performed to maximize the vertex A 'of the image (2) and the corresponding vertex A of the screen (1). Coincidence of degrees. As mentioned above, since the video signal is

INVENT20031202PI34.ptd Page 9 200419295 V. Description of the invention (5) The adjustment circuit is digitized, so that vertex A may coincide with vertex a. Press the "+" key again, and the light-emitting indicator (3) will move to the other corner of the image (2), such as vertex B. Activate the aforementioned direction button to make vertex β, which coincides with vertex b. 'This adjustment can be borrowed. Distortion used by the aforementioned electronic adjustment method on the digital image to be projected. It should be noted how to obtain independent adjustments and adjust the image only once at each vertex; that is, in a single operation cycle, the vertices must be corrected according to the instructions of the light-emitting mark (3) preset instructions. In fact, the circuit used to deform the digital image can perform the subsequent deformation without changing the result of the deformation. 1 ~ DL The adjustment of the four vertices, the adjustment data, that is, the number of moxibustions that process the image (2) and adapt it to the screen (1), is a non-volatile volatil: t ^ stored in the image projector Call out. The storage operation of the shell material can be automatically generated when the command under "Geometric Tune, J" is exited. In order to perform the optimal adjustment, the author is formed on the screen (must be smaller than the effective surface area of the screen (1) itself; the actual = image (2) f: (2) Contents: Image ⑺ The big shirt image falls outside the screen (1) and is missing. In correction 1, it is known that it may also occur during expansion deformation, abnormal center point and rotation. See also the rw on the four sides. A picture is close to the vertices C 'and D, and is located at the part of the oblique line area.' And a part of it falls outside the screen (丨) so that the operator can't see it, the image can be seen, and by raising

200419295 V. Description of the invention (6) Appropriate indication signals to the image inside the ϊί 堂 can make the straight lines a, b: c? Of each side can be inserted into the parallel images ⑺4C, then start the button to draw a reference picture ), If you need to adjust the visible part of the vertex. The straight lines a and two plus straight lines (a) fall on the dotted area outside the screen. It is obvious that c and d can also be combined into a quadrangle. Figure a), b), c; The adjustment of the j-shaped image (2) on the panel, see the schematic diagram of γ A e), f) on the fourth screen (1), which is to make the digital Two take ^ Yupi distortion aliasing; the above ㈣ ^, and the horizontal line and the image fortunately: as in accordance with the known procedures briefly described in the following to obtain the description together. The reference number m ^ & the reference number ^ which is generated by the image processing on the panel layer is used for the image 萤 on the screen p in the second and second figures = the whole starting vertex, in the fourth,), Any B ,, ", D, pointed out by :: A, so in the center of the fourth picture, △ ,, and the image, and the vertices A, B, and 'c = are the shadow points A, which are displayed on the screen to be adjusted. B, C, D and glory screen g are the correct images of Phase 2 ^, which is to make vertex A and pay attention to vertex A. Xiao You operates the entire image movement B ', C, D' Tongri Temple Equivalent ° Ming: that is, the positioning of f will cause the vertex to move inside; in order to make the movement of f 'f B', C ', D, easier, these vertices A have been selected as the starting point Since the vertex is generated in this way, so that the position of vertex A, is adjusted, the fourth figure b) must be used to represent the horizontal turn, and the position of B1, B1, and B is maintained. Do not

200419295 V. Description of the invention (7) __ — Mai Bing moves the side formed between the vertices C and d horizontally. This shift horizontally forms the image to obtain the pixels...... The value changes linearly so that the pixels arranged on A delete are advanced by 0: the fourth figure C) represents the vertical turning, which changes the positions of vertices A and 0 and moves the sides between vertices B, and c, vertically. This kind of adjustment can be obtained from the pixels of the line of = not: i: i =: from the action consistent with the "-c 'side edge", the value of 1 = Ϊ is changed to a straight line to the pixels arranged on the A-_ side as . (Ping Ming ΐ: ΐά) Explain that the vertices A, B, 〇 are kept unchanged and the vertices are “water perspective. This adjustment is supported by a straight line increase from top to bottom and the side columns are subject to the largest pixel changes. The columns that are modified with k 'and are consistent with the sides C'-D are known to be the same in the field of digital video signal processing. Therefore, the details will not be repeated. Β, D :: S: Table vertical Perspective 'is similar to horizontal perspective. Vertex A, Bottom]: Move vertex C'. In this example, from top to bottom: 2: Insert the row and receive ΞΑ: 像 一 素 ^ Preparation: D represents the horizontal size of the image The change is made by reducing the image by the same number of ": less (that is, for shrinking, ', Ren keeps the fixed starting column, so the vertex

200419295 V. Description of the invention (8) The sides between A and D have not been moved to. Once the fourth image g) represents the change in the vertical size of the image, it is increased by adding to the parent line of the second image (that is, for the purpose of expanding f: "low", the same number of pixels, but maintained at the top-" Set = the beginning, so the position of the vertex will remain unchanged. The spoon i must be described 'the fourth figure b), c), d), e), f), g) _M 仵 is selected as the start of the adjustment The position of the member point A remains unchanged. Obviously choosing a different starting vertex 'should change the fourth figure ㈨,

• I C interplays with each other; ::: Disturbance §. ) As shown in the figure to avoid the selected vertex bit will be top: is: the first step of ΐ 'by starting to move the 佶 仙 shown in the fourth as soon as it moves to its correct position A, but as previously described, this For this adjustment, i = vertices must follow. Adjacent to vertex A, vertex B, may be four. C) The vertical turning is performed by the vertical movement and the horizontal enlargement of the fourth figure f). The movement is moved to bring the top_ 'to the position of B. Withering like this will not move the vertices A and D, but will move the top%. . The vertex D ′, which is also adjacent to the vertex A, can be moved to the position of, by vertically moving the vertical magnification in the fourth graph b): = and the fourth graph g). The adjustment of vertex D will not cause any change in vertex B. Go to Γ, j 丨 7 and 第. Finally, the horizontal perspective of the fourth figure d) is used for horizontal movement. The vertical perspective of the blind Ί ™™ 6) is used for vertical movement, and it will be brought to position c with the starting vertex A and the taste cup L L. The adjustment of vertex C will not have any impact on other vertices. ~ Dagger, in accordance with: 1) pre-selected apex, such as A in the embodiment;

200419295 V. Description of the invention (9) 2) Vertices adjacent to eight 'such as 3) and eight, phase & τ /, B, and D; Zhou Zheng's vertex position, prepared for a single vertex, will not affect the adjustment of the shirt's shirt-like geometry.执行 By performing a single adjustment of each vertex, it has the same effect, whether the member point ^ has been ^, and!), it does not matter whether the _ integer of the bit vertices of other vertices depends on ^ ^, however, The adjusted points are localized; the entire vertex is moved, so the adjusted vertices are basically compensated so that when the vertex is adjusted, the previous point A, all the vertices B ,, c, remain motionless. . In particular, when the moving starting point is opposite and almost the same amount of movement, it will experience and apply to the vertex A, and the adjustment of the upper point B 'will produce the same as the vertex, so it almost seems to remain stationary, and the vertex D is used at the vertex. "Adjustment on the right" = counter-equivalent movement; this is also the only way to see the top i-shift in the adjustment: the intermediary, when the time is paid, the operator will take the job. Month > Converge the teaching method of the invention, the video projector can obviously use this. For example, the first = = without stunning the novel principle of the invention-the label of the right vertex in the picture can be paid by the small quadrilateral (4) 'In the small quadrilateral (4), the important angle is indicated by the light-emitting reference point (5). ^ Place the small quadrilateral = (4) in the center area of the image (2), and the vertex correction = will not fall off the screen, That is to say, the indication will always be in the visible area, and the adjustment of ^ is easier. The correction instructions of the vertices are also expressed in text, such as "upper right corner", "lower left corner", etc. The above adjustment methods can also be used in non-'" Performed in a reverse-projected image projector. Simple method adopted

INVENT2003l202PI34.ptd page 14 200419295 5. The invention description (ίο) method is actually beneficial to use in an image projector with a forward structure. INVENT20031202PI34.ptd Page 15 111 · 200419295 Schematic description of the first picture: The schematic diagram of the image geometry electronic adjustment method for adjusting the image geometry projected on the screen according to the present invention. Illustration of the third example: a schematic diagram of a further embodiment of the electronic geometric adjustment method of the image according to the present invention. Fourth illustration: a schematic diagram of the possible intermediate steps used in the electronic geometric adjustment method of the image of the present invention. Reference number: [Invention] (1) Screen (2) Image (3) Illumination mark (4) Small quadrangle (5) Illuminated reference point (A, B, C, D) Screen vertex (A ', B', C ', D') Image vertex (a, b, c, d) straight line

INVENT20031202PI34.ptd Page 16

Claims (1)

200419295, patent application scope 1 · A "several machines for projecting images, especially used in the reverse two adjustment method", which starts from the digital video signal of an image projection, and the image projector ^ = is projected on the screen 1) The following steps are provided as the image S: 2) The mode of electronic adjustment through the image projector; the electronic control means controls the deformation of the electronic adjustment hand; ', the digital video signal projected by Zhi Zuo 3) Each-vertex of the electronic image on the digital video signal is corresponding to the screen respectively. The deformation of the wood makes the geometric adjustment of the projected image of the first item of the encirclement ^ ^-the adjustment parameters of the vertices are stored in the non-volatile memory 7 and used after the image projector is started every time, /, · = The geometric adjustment method of the projected image in the first item of the patent scope / Daiji sign is the deformation adopted by the electronic adjustment means on the digital video signal, and each vertex is operated only in the preset order. Vertices coincide. Han ~ Xiang's mother—The geometric adjustment method of the projected image in item 1 of the patent, which is characterized in that the adjustment angle in the image is indicated by — character number. The method of projecting images on the basis of the number of items in the scope of the patent application, which is characterized by the fact that the adjustment angle in the image is indicated by a f. 1U and evening graphic symbols 6. According to the projection method of item 4 or 5 of the scope of patent application, the method is characterized in that the symbol is located at the vertex to be adjusted: near. , Adjustable INVENT20031202PI34.ptd Page 17 200419295 6. Scope of Patent Application 7. The method of geometric adjustment of the projected image according to item 1 of the scope of patent application 'is characterized in that the adjustment means includes four indications. 8 · The method for geometrically adjusting the projection image according to item 7 of the scope of the patent application, characterized in that the instruction is transmitted to the image projector via a remote control method. 9 · The method of geometric adjustment of a projected image according to item 1 of the scope of patent application 'is characterized in that the image contains a signal generated inside the image projector, making adjustment easier. I 〇 The method of geometric adjustment of a projected image according to item 9 of the scope of patent application 'is characterized in that the signal is composed of a straight line parallel to the side of the image. II. The method of geometric adjustment of the projected image according to item 1 of the patent application 'is characterized in that the image projector uses DMD (Digital Micro Mirror Element) technology. 1 2 · The method of geometric adjustment of the projected image according to item 1 of the scope of patent application 'is characterized in that the image projector uses LCD (Liquid Crystal Display) technology. 1 3 · The geometric adjustment method of the projected image according to item 1 of the scope of patent application, characterized in that the image projector uses LCoS (Reflective Liquid Crystal Projection Display) technology. 1 4 · The method for geometric adjustment of a projected image according to item 1 of the scope of patent application, characterized in that the adjustment vertices are indicated by letters, numbers or image signals located near the center of the image. 1 5 · — Ritual image projector, especially the image projection used in reverse projection INVENT20031202PI34.ptd Page 18 200419295 VI. Scope of Patent Application The feature of the geometric adjustment of the camera is based on one or more of the aforementioned methods of patent application. 16. The image projector according to one or more of the foregoing patent applications, which is characterized in that it is a reverse projector. ί ί INVENT20031202PI34.ptd Page 19 I