TW201325233A - A projector and a calibration method using the same - Google Patents
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Abstract
Description
本發明係關於一種投影裝置，特別是一種具自動校準功能之數位投影裝置及其影像校準方法。The invention relates to a projection device, in particular to a digital projection device with an automatic calibration function and an image calibration method thereof.
數位投影裝置為時下常用之影像產生設備，因其可與電腦連接並可將電腦之畫面直接投射出來，同時具有方便攜帶之便利性，因此廣泛被公司、學校等團體所採用。The digital projection device is a commonly used image generation device, and is widely used by companies, schools, and the like because it can be connected to a computer and can directly project a computer screen, and has the convenience of being convenient to carry.
一般而言，數位投影裝置在投射影像時都會內建有最理想的預設投射距離及預設投影角度，當影像被投射在此預設的投影距離，且符合預設的投影角度時，投影影像是清晰且沒有變形的。然而，因為受限於室內空間大小及數位投影裝置之擺設位置不同，無法使影像被投射在預設的投影距離及投影角度，導致投影影像變得模糊或是形成梯型失真，此時必須調整數位投影裝置之投影焦距及投射角度，以達到最佳投影效果。In general, a digital projection device has an ideal preset projection distance and a preset projection angle when projecting an image. When the image is projected at the preset projection distance and conforms to a preset projection angle, the projection is projected. The image is clear and undistorted. However, because the size of the indoor space and the position of the digital projection device are different, the image cannot be projected at a preset projection distance and projection angle, resulting in blurred projection images or ladder distortion. The projection focal length and projection angle of the digital projection device to achieve the best projection effect.
目前市面上之數位投影裝置仍仰賴人為設定之方式去調整焦距及校準梯型失真，極為不便。同時，人為之設定方式仍不夠精確，時常必須經過許多次的設定才能調整至符合需求之投影效果。或者是，使用數位投影裝置的空間不夠時，則無法調整數位投影裝置的擺放位置，以達到最佳的投影效果。At present, digital projection devices on the market still rely on artificially set methods to adjust the focal length and calibrate the ladder distortion, which is extremely inconvenient. At the same time, the artificial setting method is still not accurate enough, and often has to be adjusted many times to adjust to the projection effect that meets the demand. Alternatively, when the space for using the digital projection device is insufficient, the position of the digital projection device cannot be adjusted to achieve an optimum projection effect.
此外，數位投影裝置之投影影像因鏡頭或裝置本身的上下傾斜角度過大所形成之梯形失真，以目前習知真對梯型失真的校準技術皆採用數位校正的方式，在校準過程中必須犧牲畫面品質，無法兼顧維持投影效果。In addition, the projection image of the digital projection device is trapezoidal distortion formed by the lens or the tilt angle of the device itself. The current calibration method for the ladder distortion is digitally corrected, and the screen must be sacrificed during the calibration process. Quality, can not balance the maintenance of the projection effect.
鑒於以上的問題，本發明提供一種數位投影機及其影像校準方法，藉以解決習用必須仰賴人為設定之方式去調整數位投影裝置之焦距及校準梯型失真的問題。In view of the above problems, the present invention provides a digital projector and an image calibration method thereof, thereby solving the problem that the manual must rely on an artificial setting to adjust the focal length of the digital projection device and calibrate the ladder distortion.
本發明揭露一種投影裝置，包括一影像產生模組、一擷取模組、一控制單元及一校準模組。控制單元與擷取模組電性連接，校準模組與控制單元電性連接，校準模組與影像產生模組相連接。影像產生模組投射出一投影影像，投影影像與影像產生模組之間具有一投影距離。擷取模組擷取投影影像，並轉換成一圖像訊號。控制單元接收圖像訊號，依據投影距離計算出一投影比例，控制單元以投影比例與圖像訊號進行比對，以對應產生一校準訊號。校準模組接收校準訊號，根據校準訊號調整影像產生模組之投影設定。The invention discloses a projection device, which comprises an image generation module, a capture module, a control unit and a calibration module. The control unit is electrically connected to the capture module, the calibration module is electrically connected to the control unit, and the calibration module is connected to the image generation module. The image generation module projects a projection image, and the projection image has a projection distance from the image generation module. The capture module captures the projected image and converts it into an image signal. The control unit receives the image signal, calculates a projection ratio according to the projection distance, and the control unit compares the image with the image signal to generate a calibration signal. The calibration module receives the calibration signal and adjusts the projection setting of the image generation module according to the calibration signal.
本發明同時揭露一種數位投影裝置之影像校準方法，包括以下步驟：以一影像產生模組投射一投影影像，以一擷取模組擷取投影影像，並轉換為一圖像訊號，擷取模組傳送圖像訊號至一控制單元。控制單元依據投影影像與影像產生模組間之一投影距離計算出一投影比例，比對投影比例與圖像訊號是否符合，若投影比例與圖項訊號不符合，控制單元執行計算影像校準，並對應產生一校準訊號傳送至一校準模組。校準模組依據校準訊號調整影像產生模組之投影設定。The invention also discloses an image calibration method for a digital projection device, which comprises the steps of: projecting a projection image by an image generation module, capturing a projection image by using a capture module, and converting the image into an image signal; The group transmits image signals to a control unit. The control unit calculates a projection ratio according to a projection distance between the projection image and the image generation module, and compares the projection ratio with the image signal. If the projection ratio does not match the image signal, the control unit performs calculation image calibration, and Corresponding to generate a calibration signal is transmitted to a calibration module. The calibration module adjusts the projection settings of the image generation module according to the calibration signal.
本發明之功效在於，數位投影裝置可藉由擷取模組截取影像產生模組投射之投影影像，並轉換為圖像訊號，控制單元接受圖像訊號，與依據投影影像與影像產生模組間之投影距離計算出之投影比例比對，並對應產生校準訊號，校準模組依照校準訊號調整影像產生模組之投影焦距及投影角度，毋須透過人為設定之方式，數位投影裝置即可自動進行校準工作，達到最佳投影效果，減少人為校準之誤差及麻煩，亦可減少調整數位投影裝置的時間，進而提昇數位投影裝置使用上之便利性。此外，本發明所揭露梯形失真之校準方式則是透過調整影像產生模組投射角度之方式，不會造成損失投影畫面品質。The effect of the present invention is that the digital projection device can capture the projected image projected by the image generation module by using the capture module, and convert it into an image signal, and the control unit receives the image signal, and the projection image and the image generation module The projection distance is calculated by the projection ratio, and the calibration signal is generated correspondingly, and the calibration module adjusts the projection focal length and the projection angle of the image generation module according to the calibration signal, and the digital projection device can automatically perform calibration without manual setting. Work, achieve the best projection effect, reduce the error and trouble of human calibration, and reduce the time for adjusting the digital projection device, thereby improving the convenience of the digital projection device. In addition, the calibration method of the trapezoidal distortion disclosed in the present invention is to adjust the projection angle of the image generation module without causing loss of the quality of the projected image.
有關本發明的特徵、實作與功效，茲配合圖式作最佳實施例詳細說明如下。The features, implementations, and utilities of the present invention are described in detail below with reference to the drawings.
10．．．投影裝置10. . . Projection device
100．．．影像產生模組100. . . Image generation module
200．．．擷取摸組200. . . Touch group
300．．．控制單元300. . . control unit
400．．．校準模組400. . . Calibration module
第1圖為本發明一實施例之數位投影裝置之示意圖。FIG. 1 is a schematic diagram of a digital projection apparatus according to an embodiment of the present invention.
第2圖為本發明一實施例之數位投影裝置影像校準方法的步驟流程圖。2 is a flow chart showing the steps of a method for image calibration of a digital projection device according to an embodiment of the invention.
第3A圖及第3B圖為本發明一實施例之計算影像校準方法之調整原理示意圖。3A and 3B are schematic diagrams showing the adjustment principle of the method for calculating image calibration according to an embodiment of the present invention.
第4A圖及第4B圖為本發明一實施例所揭露計算影像校準方法之另一調整原理示意圖。4A and 4B are schematic diagrams showing another adjustment principle of the method for calculating a calculated image according to an embodiment of the present invention.
10．．．投影裝置10. . . Projection device
100．．．影像產生模組100. . . Image generation module
200．．．擷取模組200. . . Capture module
300．．．控制單元300. . . control unit
400．．．校準模組400. . . Calibration module
Claims (9)
一影像產生模組，係投射出一投影影像，該投影影像與該影像產生模組之間具有一投影距離；
一擷取模組，該擷取模組擷取該投影影像，並轉換成一圖像訊號；
一控制單元，該控制單元與該擷取模組電性連接，該控制單元接收該圖像訊號，該控制單元依據該投影距離計算出一投影比例，該控制單元以該投影比例與該圖像訊號進行比對，以對應產生一校準訊號；以及
一校準模組，電性連接該控制單元，且該校準模組接收該校準訊號，該校準模組與該影像產生模組相連接，該校準機構根據該校準訊號調整該影像產生模組之投影設定。A projection device comprising:
An image generation module projects a projection image, and the projection image has a projection distance from the image generation module;
a capture module, the capture module captures the projected image and converts it into an image signal;
a control unit, the control unit is electrically connected to the capture module, the control unit receives the image signal, and the control unit calculates a projection ratio according to the projection distance, and the control unit uses the projection ratio and the image The signal is compared to generate a calibration signal; and a calibration module is electrically connected to the control unit, and the calibration module receives the calibration signal, and the calibration module is connected to the image generation module, and the calibration is performed. The mechanism adjusts the projection setting of the image generation module according to the calibration signal.
以一影像產生模組投射一投影影像；
以一擷取模組擷取該投影影像，並轉換為一圖像訊號，該擷取模組傳送該圖像訊號至一控制單元；
該控制單元依據該投影影像與該影像產生模組間之一投影距離計算出一投影比例，比對該投影比例與該圖像訊號是否符合，若該投影比例與該圖像訊號不符合，該控制單元執行計算影像校準，並對應產生一校準訊號傳送至一校準模組；以及
該校準模組依據該校準訊號調整該影像產生模組之投影焦距及投影角度。An image calibration method for a digital projection device includes the following steps:
Projecting a projection image by an image generation module;
The image is captured by a capture module and converted into an image signal, and the capture module transmits the image signal to a control unit;
The control unit calculates a projection ratio according to a projection distance between the projection image and the image generation module, and compares the projection ratio with the image signal, and if the projection ratio does not match the image signal, the control unit The control unit performs a calculation image calibration, and correspondingly generates a calibration signal to be transmitted to a calibration module; and the calibration module adjusts a projection focal length and a projection angle of the image generation module according to the calibration signal.
該控制單元依據該圖像訊號判斷該投影影像為一矩形，且該投影影像之尺寸大於該投影比例之尺寸；
該控制單元分別計算該投影影像對角線長度倒數與該投影比例對角線長度倒數之一差值；以及
該控制單元以該差值乘以該投影距離與該影像產生模組鏡頭尺寸之乘積為該影像產生模組之一焦距值，並對應產生一設定訊號。The image calibration method of the digital projection device of claim 5, wherein the control unit calculates the image calibration further comprises the following steps:
The control unit determines that the projected image is a rectangle according to the image signal, and the size of the projected image is larger than the size of the projection ratio;
The control unit respectively calculates a difference between a reciprocal of the diagonal length of the projection image and a reciprocal of the diagonal length of the projection ratio; and the control unit multiplies the difference by the product of the projection distance and the lens size of the image generation module A focus value of one of the modules is generated for the image, and a set signal is generated correspondingly.
該控制單元依據該圖像訊號判斷該投影影像為一矩形，且該投影影像之尺寸皆小於該投影比例之尺寸；
該控制單元分別計算該投影影像對角線長度倒數與該投影比例對角線長度倒數之一差值；以及
該控制單元以該差值乘以該投影距離與該影像產生模組鏡頭尺寸之乘積為該影像產生模組之一焦距值，並對應產生一設定訊號。The image calibration method of the digital projection device of claim 5, wherein the control unit calculates the image calibration further comprises the following steps:
The control unit determines that the projected image is a rectangle according to the image signal, and the size of the projected image is smaller than the size of the projection ratio;
The control unit respectively calculates a difference between a reciprocal of the diagonal length of the projection image and a reciprocal of the diagonal length of the projection ratio; and the control unit multiplies the difference by the product of the projection distance and the lens size of the image generation module A focus value of one of the modules is generated for the image, and a set signal is generated correspondingly.
該控制單元依據該圖像訊號判斷該投影影像為一梯形，該梯形之一上底長大於該投影比例邊長之值且該梯形之一下底長小於該投影比例邊長之值；
該控制單元分別計算該梯形之上底長及下底長與該投影比例邊長之差值；以及
該控制單元以該梯形之上底長及下底長與該投影比例邊長差值之乘積為參數計算一投影角度降低值。The image calibration method of the digital projection device of claim 5, wherein the control unit calculates the image calibration further comprises the following steps:
The control unit determines that the projected image is a trapezoid according to the image signal, and the upper base length of the trapezoid is greater than the value of the projection proportional side length and the lower base length of the trapezoid is smaller than the projection length side value;
The control unit respectively calculates a difference between the base length and the bottom length of the trapezoid and the side length of the projection ratio; and the control unit multiplies the bottom length of the trapezoid and the difference between the length of the bottom and the length of the lower base and the length of the projection ratio Calculate a projection angle reduction value for the parameter.
該控制單元依據該圖像訊號判斷該投影影像為一梯形，該梯形之一上底長小於該投影比例之邊長值且該梯形之一下底長大於該投影比例邊長值；
該控制單元分別計算該梯形之上底長及下底長與該投影比例邊長之差值；以及
該控制單元以該梯形之上底長及下底長與該投影比例邊長差值之乘積為參數計算一投影角度升高值。The image calibration method of the digital projection device of claim 5, wherein the control unit calculates the image calibration further comprises the following steps:
The control unit determines, according to the image signal, that the projected image is a trapezoid, the upper base length of the trapezoid is smaller than the side length value of the projection ratio, and the lower base length of the trapezoid is greater than the projection proportional side length value;
The control unit respectively calculates a difference between the base length and the bottom length of the trapezoid and the side length of the projection ratio; and the control unit multiplies the bottom length of the trapezoid and the difference between the length of the bottom and the length of the lower base and the length of the projection ratio Calculate a projection angle rise value for the parameter.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849950A (en) * | 2014-02-19 | 2015-08-19 | 中强光电股份有限公司 | Projection system and projection method thereof |
| CN111629190A (en) * | 2019-02-28 | 2020-09-04 | 中强光电股份有限公司 | Projection system and projection method |
| CN114754679A (en) * | 2016-12-09 | 2022-07-15 | 手持产品公司 | Calibrating a size-quantifier using a ratio of measurable parameters of an optically-perceptible geometric element |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI592020B (en) | 2016-08-23 | 2017-07-11 | 國立臺灣科技大學 | Image correction method of projector and image correction system |
| CN109587459B (en) | 2017-09-29 | 2021-07-06 | 中强光电股份有限公司 | Projection system and automatic setting method thereof |
| CN109587458B (en) | 2017-09-29 | 2021-10-15 | 中强光电股份有限公司 | Projection system and automatic setting method thereof |
| CN109587457A (en) | 2017-09-29 | 2019-04-05 | 中强光电股份有限公司 | Optical projection system and its automatic setting method |
| CN110784690B (en) | 2018-07-30 | 2022-05-10 | 中强光电股份有限公司 | Projection system and projection method |
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| TW480362B (en) * | 2000-09-14 | 2002-03-21 | Delta Electronics Inc | Automatic calibration method and device of the projector display |
| JP2007078821A (en) * | 2005-09-12 | 2007-03-29 | Casio Comput Co Ltd | Projection apparatus, projection method, and program |
| DE602007006430D1 (en) * | 2006-02-21 | 2010-06-24 | Panasonic Elec Works Co Ltd | PICTURE DISPLAY DEVICE AND PICTURE DISTORTION CORRECTION FOR THIS |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104849950A (en) * | 2014-02-19 | 2015-08-19 | 中强光电股份有限公司 | Projection system and projection method thereof |
| TWI504931B (en) * | 2014-02-19 | 2015-10-21 | Coretronic Corp | Projection system and projection method thereof |
| CN114754679A (en) * | 2016-12-09 | 2022-07-15 | 手持产品公司 | Calibrating a size-quantifier using a ratio of measurable parameters of an optically-perceptible geometric element |
| CN111629190A (en) * | 2019-02-28 | 2020-09-04 | 中强光电股份有限公司 | Projection system and projection method |
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