TWI737049B - Projection calibration system and projection calibration method thereof - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
Description
本發明是有關於一種投影技術,且特別是有關於一種投影校正系統與其投影校正方法。The present invention relates to a projection technology, and more particularly to a projection correction system and a projection correction method thereof.
投影機為一種用以產生大尺寸影像畫面的顯示裝置。投影機的成像原理是將光源模組所產生的照明光束藉由光閥裝置轉換成影像光束,再將影像光束通過鏡頭投射到投影幕或牆面上以形成影像。隨著投影技術的進步及製造成本的降低,投影機的使用已拓展至各種應用場合中。觸控投影系統即是一種可供使用者在投影幕進行觸控操作的投影系統,投影幕的觸控區域用以接收使用者所執行的觸控輸入操作,以讓使用者可藉由觸控操作與投影系統進行直覺性互動。The projector is a display device used to generate large-scale image frames. The imaging principle of the projector is to convert the illumination beam generated by the light source module into an image beam through the light valve device, and then project the image beam onto the projection screen or wall through the lens to form an image. With the advancement of projection technology and the reduction of manufacturing costs, the use of projectors has been expanded to various applications. The touch projection system is a projection system that allows users to perform touch operations on the projection screen. The touch area of the projection screen is used to receive touch input operations performed by the user, so that the user can touch The operation interacts intuitively with the projection system.
需說明的是,在此種觸控投影系統中,使用者常需要對投影機所投射出的投影畫面以及投影幕所提供的觸控區域進行對齊校正,以使投影機可正確地反應觸控投影幕所接收的觸控操作來執行後續動作,進而讓使用者與觸控投影系統可順利地進行互動。更具體而言,投影幕上觸控區域的觸控邊界需要與投影畫面中的影像內容邊界準確對齊,觸控投影系統才可精準地針對觸控操作的觸控位置提供符合使用者預期的功能。於一種傳統校正方法中,使用者可移動投影機的位置或投影幕的位置來調整投影畫面的大小與畫面形狀,但此種校正方法不僅容易受限於環境限制且也不易獲得精準的校正結果。此外,於另一種傳統校正方法中,觸控投影系統可透過相機拍攝投影結果來進行觸控邊界與影像內容邊界的對齊校正,但此種校正方法需要一併考慮相機參數與相機校正,否則將無法進行準確的投影校正。又或者,於另一種傳統校正方法中,使用者可手動設定投影畫面中的影像內容邊界往內縮並藉由人眼主觀判斷來進行對齊校正,但此種校正方式的手動操作步驟繁瑣且耗時,對於使用者來說相當不便利。It should be noted that in this type of touch projection system, users often need to align the projection screen projected by the projector and the touch area provided by the projection screen, so that the projector can correctly respond to the touch. The touch operation received by the projection screen performs subsequent actions, so that the user and the touch projection system can interact smoothly. More specifically, the touch boundary of the touch area on the projection screen needs to be accurately aligned with the boundary of the image content in the projection screen, so that the touch projection system can accurately provide functions that meet the user's expectations for the touch position of the touch operation. . In a traditional calibration method, the user can move the position of the projector or the position of the projection screen to adjust the size and shape of the projection screen. However, this calibration method is not only easily limited by environmental constraints, but also difficult to obtain accurate calibration results. . In addition, in another traditional calibration method, the touch projection system can use the camera to shoot the projection result to perform the alignment correction of the touch boundary and the image content boundary, but this correction method needs to consider the camera parameters and camera calibration together, otherwise it will Cannot perform accurate projection correction. Or, in another traditional correction method, the user can manually set the image content boundary in the projection screen to shrink and perform alignment correction by subjective judgment of the human eye. However, the manual operation steps of this correction method are cumbersome and costly. Time, it is quite inconvenient for the user.
“先前技術”段落只是用來幫助了解本發明內容,因此在“先前技術”段落所揭露的內容可能包含一些沒有構成所屬技術領域中具有通常知識者所知道的習知技術。在“先前技術”段落所揭露的內容,不代表該內容或者本發明一個或多個實施例所要解決的問題,在本發明申請前已被所屬技術領域中具有通常知識者所知曉或認知。The "prior art" paragraph is only used to help understand the content of the present invention, so the contents disclosed in the "prior art" paragraph may include some conventional technologies that do not constitute the common knowledge in the technical field. The content disclosed in the "prior art" paragraph does not represent the content or the problem to be solved by one or more embodiments of the present invention, and has been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention.
有鑑於此,本發明提供一種投影校正系統與其投影校正方法,其可有效率地且準確地進行投影對齊校正,以使校正後畫面中影像內容邊界可對齊於投影幕的邊框。In view of this, the present invention provides a projection correction system and a projection correction method thereof, which can efficiently and accurately perform projection alignment correction, so that the boundary of the image content in the corrected screen can be aligned with the frame of the projection screen.
本發明一實施例提供一種投影校正系統,包括投影裝置、多個感光元件,以及運算裝置。投影裝置投影多張測試畫面於投影幕上。各張測試畫面皆包括圖騰,且這些測試畫面包括第一測試畫面與第二測試畫面。多個感光元件設置於投影幕的邊框上,並於投影裝置投影各測試畫面時量測亮度感測資訊。運算裝置耦接感光元件與投影裝置。反應於圖騰自位於第一測試畫面中的第一位置改變為位於第二測試畫面中的第二位置,亮度感測資訊自第一感測值改變為第二感測值。反應於亮度感測資訊自第一感測值改變為第二感測值,運算裝置依據圖騰於第一測試畫面中的第一位置決定畫面邊界參數。投影裝置依據畫面邊界參數進行影像縮放處理而投影與投影幕的邊框對齊的校正後畫面。An embodiment of the present invention provides a projection correction system, which includes a projection device, a plurality of photosensitive elements, and an arithmetic device. The projection device projects multiple test images on the projection screen. Each test picture includes a totem, and these test pictures include a first test picture and a second test picture. A plurality of photosensitive elements are arranged on the frame of the projection screen, and the brightness sensing information is measured when the projection device projects each test image. The computing device is coupled to the photosensitive element and the projection device. In response to the change of the totem from the first position in the first test frame to the second position in the second test frame, the brightness sensing information changes from the first sensing value to the second sensing value. In response to the brightness sensing information changing from the first sensing value to the second sensing value, the computing device determines the frame boundary parameter according to the first position of the totem in the first test frame. The projection device performs image scaling processing according to the image boundary parameters to project the corrected image aligned with the frame of the projection screen.
在本發明的一實施例中,上述的感光元件分別位於投影幕的邊框的多個角點上,且投影裝置的投影範圍至少涵蓋邊框。In an embodiment of the present invention, the above-mentioned photosensitive elements are respectively located on a plurality of corner points of the frame of the projection screen, and the projection range of the projection device at least covers the frame.
在本發明的一實施例中,上述的圖騰包括一水平線條,投影裝置藉由改變水平線條於垂直軸向上的位置而產生測試畫面。In an embodiment of the present invention, the aforementioned totem includes a horizontal line, and the projection device generates a test image by changing the position of the horizontal line on the vertical axis.
在本發明的一實施例中,上述的運算裝置依據第一測試畫面中水平線條於垂直軸向上的第一位置,決定畫面邊界參數中的一上下邊界參數。In an embodiment of the present invention, the aforementioned computing device determines an upper and lower boundary parameter of the frame boundary parameters according to the first position of the horizontal line on the vertical axis in the first test frame.
在本發明的一實施例中,上述的圖騰包括一垂直線條,投影裝置藉由改變垂直線條於水平軸向上的位置而產生測試畫面。In an embodiment of the present invention, the above-mentioned totem includes a vertical line, and the projection device generates a test image by changing the position of the vertical line on the horizontal axis.
在本發明的一實施例中,上述的運算裝置依據第一測試畫面中垂直線條於水平軸向上的第一位置,決定畫面邊界參數中的一左右邊界參數。In an embodiment of the present invention, the aforementioned computing device determines a left and right boundary parameter of the frame boundary parameters according to the first position of the vertical line on the horizontal axis in the first test frame.
在本發明的一實施例中,上述的圖騰包括一水平線條與一垂直線條,投影裝置藉由改變垂直線條於水平軸向上的位置以及改變水平線條於垂直軸向上的位置而產生測試畫面。In an embodiment of the present invention, the above-mentioned totem includes a horizontal line and a vertical line, and the projection device generates a test image by changing the position of the vertical line on the horizontal axis and the position of the horizontal line on the vertical axis.
在本發明的一實施例中,上述的投影裝置依據畫面邊界參數縮小來自運算裝置的一原始影像,並填補外圍影像區塊於縮小後原始影像的四周而產生校正後畫面,且校正後畫面中的原始影像的影像邊緣對齊於邊框。In an embodiment of the present invention, the above-mentioned projection device reduces an original image from the computing device according to the frame boundary parameters, and fills in the peripheral image blocks around the reduced original image to generate a corrected image, and the corrected image is The edge of the original image is aligned with the frame.
在本發明的一實施例中,上述的投影裝置依據運算裝置提供的圖騰參數產生測試畫面,圖騰參數包括圖騰位置參數,投影裝置依據圖騰位置參數產生分別作為測試畫面的多張圖騰畫面,圖騰分別位於圖騰畫面中的不同位置,且圖騰的尺寸是固定的。In an embodiment of the present invention, the above-mentioned projection device generates test images according to totem parameters provided by the computing device, the totem parameters include totem position parameters, and the projection device generates multiple totem images as the test images according to the totem position parameters, and the totems are respectively Located in different positions in the totem screen, and the size of the totem is fixed.
在本發明的一實施例中,上述的投影裝置依據運算裝置提供的圖騰參數產生測試畫面,圖騰參數包括圖騰壓縮變形參數,投影裝置依據圖騰壓縮變形參數壓縮一圖騰畫面,並填補影像區塊於壓縮後的圖騰畫面四周而產生測試畫面,圖騰於圖騰畫面中的位置固定,且圖騰的尺寸依據圖騰壓縮變形參數而縮小。In an embodiment of the present invention, the above-mentioned projection device generates a test image according to totem parameters provided by the computing device. The totem parameters include totem compression deformation parameters. The projection device compresses a totem image according to the totem compression deformation parameters, and fills in the image block. A test image is generated around the compressed totem screen. The position of the totem in the totem screen is fixed, and the size of the totem is reduced according to the compression deformation parameters of the totem.
在本發明的一實施例中,上述的投影裝置更投影一第一預設畫面,各感光元件於投影裝置投影第一預設畫面時量測一第一亮度值且於投影裝置沒有投影第一預設畫面時量測一第二亮度值,運算裝置依據第一亮度值與第二亮度值之間的差異值判斷投影裝置的投影範圍是否涵蓋邊框上的感光元件,其中第一亮度值與第二亮度值用以決定第一感測值與第二感測值。In an embodiment of the present invention, the above-mentioned projection device further projects a first preset screen, and each photosensitive element measures a first brightness value when the projection device projects the first preset screen, and the projection device does not project the first preset screen. When the screen is preset, a second brightness value is measured, and the computing device determines whether the projection range of the projection device covers the photosensitive element on the frame according to the difference between the first brightness value and the second brightness value, wherein the first brightness value and the second brightness value The two brightness values are used to determine the first sensing value and the second sensing value.
在本發明的一實施例中,上述的各感光元件於投影裝置投影一第二預設畫面或不投影時量測第二亮度值。In an embodiment of the present invention, each of the above-mentioned photosensitive elements measures the second brightness value when a second preset image is projected on the projection device or is not projected.
本發明一實施例提供一種投影校正方法,所述方法包括下列步驟。藉由投影裝置投影多張測試畫面於投影幕上。各測試畫面皆包括圖騰,這些測試畫面包括第一測試畫面與第二測試畫面。於投影各測試畫面時,藉由位於投影幕的邊框上的多個感光元件量測亮度感測資訊。反應於圖騰自位於第一測試畫面中的第一位置改變為位於第二測試畫面中的第二位置,亮度感測資訊自第一感測值改變為第二感測值。反應於亮度感測資訊自第一感測值改變為第二感測值,依據圖騰於第一測試畫面中的第一位置決定畫面邊界參數。依據畫面邊界參數進行影像縮放處理而投影與投影幕的邊框對齊的校正後畫面。An embodiment of the present invention provides a projection correction method. The method includes the following steps. Project multiple test images on the projection screen by the projection device. Each test picture includes a totem, and these test pictures include a first test picture and a second test picture. When projecting each test image, the brightness sensing information is measured by a plurality of photosensitive elements located on the frame of the projection screen. In response to the change of the totem from the first position in the first test frame to the second position in the second test frame, the brightness sensing information changes from the first sensing value to the second sensing value. In response to the brightness sensing information changing from the first sensing value to the second sensing value, the frame boundary parameter is determined according to the first position of the totem in the first test frame. Perform image scaling processing according to the frame boundary parameters to project the corrected frame aligned with the frame of the projection screen.
在本發明的一實施例中,上述的感光元件分別位於投影幕的邊框的多個角點上,且投影裝置的投影範圍至少涵蓋邊框。In an embodiment of the present invention, the above-mentioned photosensitive elements are respectively located on a plurality of corner points of the frame of the projection screen, and the projection range of the projection device at least covers the frame.
在本發明的一實施例中,上述的圖騰包括一水平線條,所述方法更包括:藉由改變水平線條於垂直軸向上的位置而產生測試畫面。In an embodiment of the present invention, the above-mentioned totem includes a horizontal line, and the method further includes: generating a test image by changing the position of the horizontal line on the vertical axis.
在本發明的一實施例中,上述的反應於亮度感測資訊自第一感測值改變為第二感測值,依據圖騰於第一測試畫面中的第一位置決定畫面邊界參數的步驟包括:依據第一測試畫面中水平線條於垂直軸向上的第一位置,決定畫面邊界參數中的一上下邊界參數。In an embodiment of the present invention, the step of determining the frame boundary parameter according to the first position of the totem in the first test frame in response to the brightness sensing information changing from the first sensed value to the second sensed value includes : According to the first position of the horizontal line on the vertical axis in the first test picture, determine an upper and lower boundary parameter of the picture boundary parameters.
在本發明的一實施例中,上述的圖騰包括一垂直線條,所述方法更包括:藉由改變垂直線條於水平軸向上的位置而產生測試畫面。In an embodiment of the present invention, the above-mentioned totem includes a vertical line, and the method further includes: generating a test image by changing the position of the vertical line on the horizontal axis.
在本發明的一實施例中,上述的反應於亮度感測資訊自第一感測值改變為第二感測值,依據圖騰於該第一測試畫面中的第一位置決定畫面邊界參數的步驟包括:依據第一測試畫面中垂直線條於水平軸向上的第一位置,運算裝置決定畫面邊界參數中的一左右邊界參數。In an embodiment of the present invention, the step of determining the frame boundary parameter according to the first position of the totem in the first test frame is reflected in the change of the brightness sensing information from the first sensed value to the second sensed value. Including: according to the first position of the vertical line on the horizontal axis in the first test picture, the computing device determines a left and right boundary parameter in the picture boundary parameters.
在本發明的一實施例中,上述的圖騰包括一水平線條與一垂直線條,所述方法更包括:藉由沿水平軸向左右平移垂直線條以及沿垂直軸向上下平移水平線條而產生測試畫面。In an embodiment of the present invention, the above-mentioned totem includes a horizontal line and a vertical line, and the method further includes: generating a test image by translating the vertical line left and right along the horizontal axis and the horizontal line up and down along the vertical axis .
在本發明的一實施例中,上述的依據畫面邊界參數進行影像縮放處理而投影與投影幕的邊框對齊的校正後畫面的步驟包括:依據畫面邊界參數縮小一原始影像,並填補外圍影像區塊於縮小後原始影像的四周而產生校正後畫面,且校正後畫面中的原始影像的影像邊緣對齊於邊框。In an embodiment of the present invention, the above-mentioned step of performing image scaling processing according to the picture boundary parameters to project the corrected picture aligned with the frame of the projection screen includes: reducing an original image according to the picture boundary parameters, and filling the peripheral image block A corrected frame is generated around the reduced original image, and the image edges of the original image in the corrected frame are aligned with the frame.
在本發明的一實施例中,上述的方法更包括:依據圖騰參數產生測試畫面,其中圖騰參數包括圖騰位置參數;以及依據圖騰位置參數產生分別作為測試畫面的多張圖騰畫面,圖騰分別位於圖騰畫面中的不同位置,且圖騰的尺寸是固定的。In an embodiment of the present invention, the above-mentioned method further includes: generating a test picture according to the totem parameter, wherein the totem parameter includes a totem position parameter; and generating a plurality of totem pictures as the test picture according to the totem position parameter, and the totems are respectively located in the totem. Different positions in the screen, and the size of the totem is fixed.
在本發明的一實施例中,上述的方法更包括:依據圖騰參數產生測試畫面,圖騰參數包括圖騰壓縮變形參數;以及依據圖騰壓縮變形參數壓縮一圖騰畫面,並填補影像區塊於壓縮後的圖騰畫面四周而產生測試畫面,圖騰於圖騰畫面中的位置固定,且圖騰的尺寸依據圖騰壓縮變形參數而縮小。In an embodiment of the present invention, the above method further includes: generating a test image according to totem parameters, the totem parameters including totem compression deformation parameters; and compressing a totem screen according to the totem compression deformation parameters, and filling the image block after compression Test images are generated around the totem screen, the position of the totem in the totem screen is fixed, and the size of the totem is reduced according to the totem compression deformation parameters.
在本發明的一實施例中,上述的方法更包括:藉由投影裝置投影一第一預設畫面;藉由各感光元件於投影裝置投影第一預設畫面時量測一第一亮度值;藉由各感光元件於投影裝置沒有投影第一預設畫面時量測一第二亮度值;以及依據第一亮度值與該第二亮度值之間的差異值判斷投影裝置的投影範圍是否涵蓋邊框上的感光元件,其中第一亮度值與第二亮度值用以決定第一感測值與第二感測值。In an embodiment of the present invention, the above method further includes: projecting a first preset image by the projection device; and measuring a first brightness value when the first preset image is projected on the projection device by each photosensitive element; Measure a second brightness value by each photosensitive element when the projection device is not projecting the first preset screen; and determine whether the projection range of the projection device covers the frame according to the difference between the first brightness value and the second brightness value On the photosensitive element, the first brightness value and the second brightness value are used to determine the first sensing value and the second sensing value.
在本發明的一實施例中,上述的方法更包括:藉由各感光元件於投影裝置投影一第二預設畫面或不投影時量測第二亮度值。In an embodiment of the present invention, the above method further includes: using each photosensitive element to project a second preset image on the projection device or measure the second brightness value when the projection device is not projected.
基於上述,在本發明的實施例中,投影裝置將投影包括圖騰的多張測試畫面於投影幕上,且各張測試畫面中的圖騰位置是變動的。並且,當投影裝置投影這些測試畫面於投影幕上時,藉由設置於投影幕的邊框上的感光元件來感測測試畫面的亮度資訊。由於圖騰位置將隨著測試畫面的切換而改變,因此可藉由持續地感測亮度感測資訊來檢測出感光元件相對於投影範圍的位置,從而依據感光元件相對於投影範圍的位置來決定畫面邊界參數。藉此,使投影機依據畫面邊界參數進行影像縮放處理而產生可與投影幕的邊框對齊的校正後畫面,從而提供一種有效率且便利的投影校正方法。Based on the above, in the embodiment of the present invention, the projection device projects a plurality of test images including totems on the projection screen, and the position of the totems in each test image is changed. Moreover, when the projection device projects these test images on the projection screen, the brightness information of the test images is sensed by the photosensitive element arranged on the frame of the projection screen. Since the position of the totem will change with the switching of the test screen, the position of the photosensitive element relative to the projection range can be detected by continuously sensing the brightness sensing information, and the picture can be determined according to the position of the photosensitive element relative to the projection range Boundary parameters. In this way, the projector is allowed to perform image scaling processing according to the image boundary parameters to generate a corrected image that can be aligned with the frame of the projection screen, thereby providing an efficient and convenient projection correction method.
為讓本發明的上述特徵和優點能更明顯易懂,下文特舉實施例,並配合所附圖式作詳細說明如下。In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.
有關本發明之前述及其他技術內容、特點與功效,在以下配合參考圖式之一較佳實施例的詳細說明中,將可清楚的呈現。以下實施例中所提到的方向用語,例如:上、下、左、右、前或後等,僅是參考附加圖式的方向。因此,使用的方向用語是用來說明並非用來限制本發明。The foregoing and other technical content, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, for example: up, down, left, right, front or back, etc., are only directions for referring to the attached drawings. Therefore, the directional terms used are used to illustrate but not to limit the present invention.
圖1是依據本發明一實施例繪示的投影校正系統的示意圖。請參照圖1,投影校正系統10包括投影裝置110、多個感光元件120_1~120_4、投影幕S1,以及運算裝置130。FIG. 1 is a schematic diagram of a projection correction system according to an embodiment of the invention. Please refer to FIG. 1, the
投影裝置110可將影像投影於投影幕S1上,其可以為液晶投影機(Liquid Crystal Projector,LCP)、數位光學處理(Digital Light Processing,DLP)投影機,或反射式液晶(Liquid Crystal On Silicon,LCOS)投影顯示裝置等等。在本實施例中,投影裝置110還可包括光源模組、光機模組、鏡頭模組以及相關光學及電路控制元件等等。例如,投影裝置110還可以包括用以進行影像處理的影像處理電路。The
投影幕S1用以顯示投影裝置110投射出來的投影畫面,並具有邊框F1。在一實施例中,觸控式的投影幕S1可包括邊框F1以及嵌於邊框F1內的觸控面板。觸控式的投影幕S1可依據投影裝置110投射的影像光束顯示投影畫面並偵測使用者下達的觸控操作。觸控式的投影幕S1可以是投射電容式觸控投影幕、電磁式觸控投影幕、電阻式觸控投影幕或是其他適當的觸控投影幕,本發明對此不限制。此外,於一實施例中,投影幕S1也可包括邊框F1以及嵌於邊框F1內且不具備觸控功能的其他顯示媒介,例如投影布幕等等。The projection screen S1 is used to display the projection screen projected by the
感光元件120_1~120_4設置於投影幕S1的邊框F1上。在本實施例中,感光元件120_1~120_4可用以感測投影畫面的亮度而輸出亮度感測值。感光元件120_1~120_4例如是電荷耦合元件(Charge Coupled Device,CCD)、互補性氧化金屬半導體(Complementary Metal-Oxide Semiconductor,CMOS)元件或其他元件。在其他實施例中,感光元件120_1~120_4可例如是用以偵測色光的色度的顏色感測器(Color Sensor),本發明對此不限制。在一實施例中,感光元件120_1~120_4分別位於投影幕S1的邊框F1的多個角點上,且投影裝置110的投影範圍R1至少涵蓋邊框F1。The photosensitive elements 120_1 to 120_4 are arranged on the frame F1 of the projection screen S1. In this embodiment, the photosensitive elements 120_1 to 120_4 can be used to sense the brightness of the projection screen to output brightness sensing values. The photosensitive elements 120_1 to 120_4 are, for example, Charge Coupled Devices (CCD), Complementary Metal-Oxide Semiconductor (CMOS) elements, or other elements. In other embodiments, the photosensitive elements 120_1 to 120_4 may be, for example, color sensors for detecting the chromaticity of the color light, and the invention is not limited thereto. In an embodiment, the photosensitive elements 120_1 to 120_4 are respectively located on multiple corner points of the frame F1 of the projection screen S1, and the projection range R1 of the
需說明的是,圖1係以4個感光元件120_1~120_4且分別配置於投影幕S1的邊框F1的4個角點上為例進行說明,但本發明對於感光元件的數量與設置位置並不加以限制,其可視實際應用而設置。像是,感光元件的數目也可能是其他數量,例如2個或8個等等,感光元件可例如配置於各邊框的中間點等。需說明的是,在一實施例中,為了依據感光元件產生的亮度量測結果獲取邊框F1所界定的矩形顯示邊界,感光元件的數目至少要2個且分別位於邊框F1之對角線的兩個角點上。It should be noted that, FIG. 1 takes four photosensitive elements 120_1 to 120_4 and is respectively arranged on the four corners of the frame F1 of the projection screen S1 as an example for description, but the present invention does not have any influence on the number and location of the photosensitive elements. To be restricted, it can be set according to the actual application. For example, the number of photosensitive elements may also be other numbers, such as 2 or 8, etc., and the photosensitive elements may be arranged at the middle point of each frame, for example. It should be noted that, in one embodiment, in order to obtain the rectangular display boundary defined by the frame F1 according to the brightness measurement result generated by the photosensitive element, the number of the photosensitive elements must be at least two and they are respectively located at two diagonals of the frame F1. Corner point.
運算裝置130耦接投影裝置110與多個感光元件120_1~120_4,其包括記憶體以及耦接至記憶體的至少一個處理器。運算裝置130可以是桌上電腦、筆記型電腦、工作站(work station)、工業電腦、伺服器主機等具有運算能力的電腦控制系統。所述記憶體可以是任意型式的非暫態性、揮發性、非揮發性的資料儲存裝置,其用以儲存緩衝資料、永久資料以及用來執行運算裝置130的功能的編譯程式碼。所述處理器可以是場式可程式閘陣列(Field Programmable Array,FPGA)、可程式化邏輯裝置(Programmable Logic Device,PLD)、特殊應用積體電路(Application Specific Integrated Circuits,ASIC)、其他類似裝置或這些裝置的組合。處理器亦可以是中央處理單元(Central Processing Unit,CPU)或是其他可程式化之一般用途或特殊用途的微處理器(Microprocessor)、數位訊號處理器(Digital Signal Processor,DSP)、圖形處理單元(Graphics Processing Unit,GPU)、其他類似裝置或這些裝置的組合。The
圖2是依據本發明一實施例繪示的投影校正方法的流程圖,而圖2的方法流程可以由圖1的投影校正系統10的各元件實現。請同時參照圖1及圖2,以下即搭配圖1中投影校正系統10的各項元件,說明本實施例的投影校正方法的步驟。FIG. 2 is a flowchart of a projection correction method according to an embodiment of the present invention, and the method flow of FIG. 2 can be implemented by the components of the
於步驟S201,藉由投影裝置110投影多張測試畫面於投影幕S1上。投影裝置110投射影像光束於投影幕S1上,且投影裝置110的投影範圍R1更寬廣於投影幕S1而至少涵蓋邊框F1。換言之,投影範圍R1內由投影裝置110所投影的測試畫面會覆蓋感光元件120_1~120_4。In step S201, a plurality of test images are projected on the projection screen S1 by the
在一實施例中,各張測試畫面皆包括圖騰與畫面背景。圖騰可包括水平線條(bar)、垂直線條或其組合。並且,圖騰與畫面背景的色彩彼此相異。舉例而言,圖騰可以為白色且畫面背景可為黑色,但本發明並不限制於此。需說明的是,這些測試畫面中圖騰的位置是變動的。換言之,當投影裝置110自投影這些測試畫面其中之一切換為這些投影測試畫面其中之另一時,圖騰的顯示位置將會發生改變,即不同的測試畫面呈現於投影幕S1上時,圖騰的顯示位置相對於邊框F1的距離會變化。In one embodiment, each test picture includes a totem and a picture background. The totem may include horizontal bars, vertical bars, or a combination thereof. Moreover, the colors of the totem and the screen background are different from each other. For example, the totem can be white and the screen background can be black, but the invention is not limited thereto. It should be noted that the positions of the totems in these test screens are changed. In other words, when the
舉例而言,圖3A與圖3B是依據本發明一實施例所繪示的測試畫面的範例。請參照圖3A,假設圖騰為白色水平線條L1(圖式中以斜線區示意)且畫面背景是黑色,投影裝置110可藉由改變白色水平線條L1於垂直軸向(即Y軸)上的位置而產生兩張測試畫面It1、It2。亦即,測試畫面It1可包括位於畫面邊緣的白色水平線條L1。另一張測試畫面It2可包括接近畫面邊緣的白色水平線條L1。請參照圖3B,假設圖騰為白色垂直線條L2(圖式中以斜線區示意)且畫面背景是黑色,投影裝置110藉由改變白色垂直線條L2於水平軸向(即X軸)上的位置而產生兩張測試畫面It3、It4。亦即,測試畫面It3可包括位於畫面邊緣的白色垂直線條L2。另一張測試畫面It4可包括接近畫面邊緣的白色垂直線條L2。投影裝置110產生測試畫面的實施細節將說明於後方。然而,圖3A與圖3B係以兩張測試畫面進行說明,但本發明對於測試畫面的數量並不限制。For example, FIGS. 3A and 3B are examples of test screens drawn according to an embodiment of the present invention. Please refer to FIG. 3A, assuming that the totem is a white horizontal line L1 (indicated by a diagonal line in the figure) and the screen background is black, the
接著,於步驟S202,於依序投影各張測試畫面時,藉由位於投影幕S1的邊框F1上的多個感光元件120_1~120_4量測亮度感測資訊。具體而言,當投影裝置110投影各張測試畫面時,藉由多個感光元件120_1~120_4分別於邊框F1上的不同位置量測關聯於各張測試畫面的亮度感測資訊,且感光元件120_1~120_4將亮度感測資訊回報給運算裝置130。於圖1的範例中,當投影裝置110依序投影多張測試畫面時,感光元件120_1~120_4可於邊框F1上4個角點上進行亮度量測,並輸出分別對應至這些角點且關聯於各張測試畫面的4個亮度感測值。Next, in step S202, when each test frame is projected sequentially, the brightness sensing information is measured by the multiple photosensitive elements 120_1 to 120_4 on the frame F1 of the projection screen S1. Specifically, when the
在一實施例中,以依序顯示的第一測試畫面與第二測試畫面進行說明,反應於圖騰自位於第一測試畫面中的位置(亦稱為第一位置)改變為位於第二測試畫面中的位置(亦稱為第二位置),部份或全部感光元件120_1~120_4所感測的亮度感測資訊將自第一感測值改變為第二感測值。於此,第一感測值是針對第一測試畫面進行亮度感測的量測結果,而第二感測值是針對第二測試畫面進行亮度感測的量測結果。In one embodiment, the first test picture and the second test picture displayed in sequence are described, which reflects that the totem changes from the position in the first test picture (also referred to as the first position) to the second test picture. In the position (also referred to as the second position), some or all of the brightness sensing information sensed by the photosensitive elements 120_1 to 120_4 will be changed from the first sensing value to the second sensing value. Here, the first sensing value is a measurement result of brightness sensing for the first test image, and the second sensing value is a measurement result of brightness sensing for the second test image.
詳細而言,由於這些測試畫面中圖騰與畫面背景的色彩是相異,因此第一測試畫面中的圖騰是否覆蓋顯示在感光元件120_1~120_4上方會影響感光元件120_1~120_4的亮度感測結果。亦即,感光元件120_1~120_4所輸出的亮度感測值可用以反應圖騰的顯示位置與感光元件120_1~120_4的量測位置是否重疊。舉例而言,若某一張測試畫面中圖騰的顯示位置重疊於感光元件120_1的量測位置,則感光元件120_1將輸出第一感測值。若某一張測試畫面中圖騰的顯示位置不重疊於感光元件120_1的量測位置,則感光元件120_1將輸出相異於第一感測值的第二感測值。在一實施例中,感光元件120_1~120_4進行亮度感測而產生的第一感測值與第二感測值是取決於環境光源以及測試畫面中圖騰與畫面背景的色彩。In detail, since the colors of the totems in these test images and the screen background are different, whether the totems in the first test image are displayed over the photosensitive elements 120_1 to 120_4 will affect the brightness sensing results of the photosensitive elements 120_1 to 120_4. That is, the brightness sensing values output by the photosensitive elements 120_1 to 120_4 can be used to reflect whether the display position of the totem and the measurement positions of the photosensitive elements 120_1 to 120_4 overlap. For example, if the display position of the totem in a certain test frame overlaps the measurement position of the photosensitive element 120_1, the photosensitive element 120_1 will output the first sensing value. If the display position of the totem in a certain test frame does not overlap the measurement position of the photosensitive element 120_1, the photosensitive element 120_1 will output a second sensing value different from the first sensing value. In one embodiment, the first sensing value and the second sensing value generated by the light-sensing elements 120_1 to 120_4 for brightness sensing depend on the ambient light source and the color of the totem and the screen background in the test screen.
於是,於步驟S203,反應於亮度感測資訊自第一感測值改變為第二感測值,運算裝置130可依據圖騰於第一測試畫面中的第一位置決定畫面邊界參數。更具體而言,當運算裝置130判斷感光元件120_1~120_4其中之一者所回報的亮度感測資訊自第一感測值改變為第二感測值時,代表圖騰於第一測試畫面中的第一位置重疊於感光元件120_1~120_4其中之所述一者的量測位置,因此運算裝置130可依據圖騰於第一測試畫面中的第一位置獲取邊框F1的一個角點相對於投影範圍R1的位置資訊並據以決定畫面邊界參數。Thus, in step S203, in response to the brightness sensing information changing from the first sensing value to the second sensing value, the
在一實施例中,當感光元件120_1~120_4所回報的亮度感測資訊分別自對應於白色圖騰的第一感測值改變為對應於黑色畫面背景的第二感測值時,運算裝置130可依據對應於第一感測值的圖騰位置偵測出邊框F1四個角點相對於投影範圍R1的所在位置並據以決定畫面邊界參數。在一實施例中,畫面邊界參數包括上下邊界參數、左右邊界參數或其組合,其可用以定義出邊框F1於投影範圍R1中所界定出的理想顯示邊界。舉例而言,在圖1的範例中,由於感光元件120_1~120_4分別位於邊框F1的四個角點進行亮度感測,因此左右邊界參數可包括4個X座標值且上下邊界參數可包括4個Y座標值,此4個X軸座標值與4個Y軸座標值可視為投影範圍R1中邊框F1四個角點的位置。總而言之,藉由依序投影多張測試畫面且感光元件120_1~120_4持續進行亮度感測,運算裝置130可依據感光元件120_1~120_4回報的亮度感測資訊推估邊框F1於投影範圍R1中所界定出的理想顯示邊界。In one embodiment, when the brightness sensing information reported by the photosensitive elements 120_1 to 120_4 is changed from the first sensing value corresponding to the white totem to the second sensing value corresponding to the black screen background, the
之後,於步驟S204,投影裝置110可依據畫面邊界參數進行影像縮放處理而投影與投影幕S1的邊框F1對齊的校正後畫面。在一實施例中,投影裝置110可依據畫面邊界參數縮小來自運算裝置130的原始影像,並填補外圍影像區塊於縮小後原始影像的四周而產生校正後畫面。需注意的是,此校正後畫面中的原始影像的影像邊緣對齊於邊框F1。換言之,原始影像的影像內容邊界將對齊於邊框F1,使原始影像的影像內容呈現於邊框F1內,而黑色外圍影像區塊將呈現於邊框F1的外部。After that, in step S204, the
舉例而言,圖4是依據本發明實施例所繪示的校正後畫面的示意圖。請參照圖4,參考圖1範例中,假設畫面邊界參數可包括4個X軸座標值X1
、X2
、X3
、X4
與4個Y軸座標值Y1
、Y2
、Y3
、Y4
,則投影裝置110可依據上述八個座標元素來對原始影像Img_ori進行包括影像縮放處理的影像變形處理,以產生包括經縮小的原始影像Img_ori。此外,投影裝置110將依據上述八個座標元素將外圍影像區塊ZB填補於經縮小的原始影像Img_ori外圍,以產生包括經縮小的原始影像Img_ori與外圍影像區塊ZB的校正後畫面CF1。其中,經縮小的原始影像Img_ori的四個角落像素點位於校正後畫面CF1中的位置分別為(X1
,Y1
)、(X2
,Y2
)、(X3
,Y3
)、(X4
,Y4
)。當投影裝置110投影校正後畫面CF1時,原始影像Img_ori的影像內容邊界E1將對齊投影幕S1的邊框F1。For example, FIG. 4 is a schematic diagram of a corrected picture according to an embodiment of the present invention. Please refer to Figure 4. In the example of Figure 1, it is assumed that the picture boundary parameters can include 4 X-axis coordinate values X 1 , X 2 , X 3 , X 4 and 4 Y-axis coordinate values Y 1 , Y 2 , Y 3 , Y 4 , the
圖5是依據本發明一實施例繪示的投影裝置的示意圖。請參照圖5,投影裝置110可包括圖騰產生模組111、畫面變形模組112,以及光閥裝置113。圖騰產生模組111與畫面變形模組112可由軟體程式、韌體、硬體電路或其組合實作而得,在此不加以限制。光閥裝置113例如是透射式液晶顯示面板(transmissive LCD panel)、矽基液晶(LCOS)面板或數位微鏡元件(DMD)。FIG. 5 is a schematic diagram of a projection device according to an embodiment of the invention. Please refer to FIG. 5, the
於一實施例中,投影裝置110可依據運算裝置130所提供的圖騰參數來產生多張測試畫面,各張測試畫面中圖騰的位置是依據圖騰參數而決定,圖騰參數可包括圖騰位置參數CMD1或圖騰壓縮變形參數CMD2。圖騰產生模組111可獲取來自運算裝置130的圖騰位置參數CMD1,並依據來自運算裝置130的圖騰位置參數CMD1產生至少一張圖騰畫面ImgP。畫面變形模組112可獲取來自運算裝置130的圖騰壓縮變形參數CMD2,並用以依據圖騰壓縮變形參數CMD2執行畫面變形處理。以下列舉兩種產生測試畫面的實施方式。In one embodiment, the
在一實施例中,投影裝置110的圖騰產生模組111可依據圖騰位置參數CMD1產生分別作為多張測試畫面ImgT的多張圖騰畫面ImgP。亦即,畫面變形模組112並不執行影像變形處理,圖騰產生模組111產生的多張圖騰畫面ImgP即用以作為由光閥裝置113接收的多張測試畫面ImgT。此外,反應於圖騰位置參數CMD1的改變,圖騰分別位於多張圖騰畫面ImgP中的不同位置。舉例而言,圖騰分別位於多張圖騰畫面ImgP中的位置將自畫面邊緣往畫面中心移動,致使由光閥裝置113投影出來的圖騰可隨測試畫面ImgT的逐張投影而逐漸逼近感光元件120_1~120_4。需說明的是,由於畫面變形模組112並不執行影像變形處理,因此多張圖騰畫面ImgP中圖騰的尺寸是固定的。In one embodiment, the
舉例而言,圖6是依據本發明一實施例繪示的依據圖騰位置參數產生測試畫面的示意圖。請參照圖5及圖6,圖騰設置為包括兩條水平線條Pa1、Pa2,且圖騰產生模組111產生的圖騰影像用以作為測試畫面。首先,圖騰產生模組111可先依據圖騰位置參數CMD1產生測試畫面It5。測試畫面It5包括位於上下畫面邊緣的水平線條Pa1、Pa2,且測試畫面It5中水平線條Pa1、Pa2的寬度皆為W1(像素單位)。接著,圖騰產生模組111可先依據圖騰位置參數CMD1產生另一張測試畫面It6。測試畫面It6包括靠近上下畫面邊緣的水平線條Pa1、Pa2,且測試畫面It6中水平線條Pa1、Pa2的寬度皆為W1,其中在測試畫面It6中的水平線條Pa1、Pa2相對於在測試畫面It5中的水平線條Pa1、Pa2較接近測試畫面的中心。接著,圖騰產生模組111可先依據圖騰位置參數CMD1產生又一張測試畫面It7。測試畫面It7包括靠近上下畫面邊緣的水平線條Pa1、Pa2,且測試畫面It7中水平線條Pa1、Pa2的寬度皆為W1,其中在測試畫面It7中的水平線條Pa1、Pa2相對於在測試畫面It6中的水平線條Pa1、Pa2較接近測試畫面的中心。由此可知,此兩條水平線條Pa1、Pa2將隨著測試畫面It5~It7的依序顯示而逐漸分別往畫面中心移動。For example, FIG. 6 is a schematic diagram of generating a test image according to totem position parameters according to an embodiment of the present invention. Referring to FIGS. 5 and 6, the totem is set to include two horizontal lines Pa1 and Pa2, and the totem image generated by the
此外,在一實施例中,投影裝置110的圖騰產生模組111可依據固定的圖騰位置參數CMD1產生一張圖騰畫面ImgP。投影裝置110的畫面變形模組112再依據圖騰壓縮變形參數CMD2壓縮圖騰畫面ImgP的高度或寬度,並填補影像區塊於壓縮後的圖騰畫面四周而產生多張測試畫面ImgT。更詳細而言,反應於圖騰壓縮變形參數CMD2的改變,圖騰畫面ImgP將依據不同的縮放倍率被壓縮而據以產生多張測試畫面ImgT,因此多張測試畫面ImgT中圖騰的尺寸依據圖騰壓縮變形參數CMD2而縮小。此外,由於圖騰產生模組111是依據固定的圖騰位置參數CMD1產生一張圖騰畫面ImgP,因此圖騰於圖騰畫面ImgP中的位置固定。In addition, in one embodiment, the
舉例而言,圖7是依據本發明一實施例繪示的依據圖騰壓縮變形參數產生測試畫面的示意圖。請參照圖5及圖7,圖騰設置為包括兩條水平線條Pa3、Pa4。圖騰產生模組111可先依據圖騰位置參數CMD1產生圖騰畫面。圖騰壓縮變形參數CMD2可為縮放倍率。首先,在縮放倍率為1的情況下,畫面變形模組112可依據圖騰壓縮變形參數CMD2產生測試畫面It8。測試畫面It8包括位於上下畫面邊緣的水平線條Pa3、Pa4,且測試畫面It8中水平線條Pa3、Pa4的寬度皆為W1(像素單位)。接著,在縮放倍率改變為α(α>1)的情況下,畫面變形模組112可依據圖騰壓縮變形參數CMD2壓縮圖騰畫面的高度(垂直方向的長度)而產生壓縮後的圖騰畫面It8’,並填補影像區塊Z1、Z2於壓縮後的圖騰畫面It8’四周而產生測試畫面It9。測試畫面It9中水平線條Pa3、Pa4的寬度皆為W2,且W2小於W1。接著,在縮放倍率改變為β(β>α>1)的情況下,畫面變形模組112可依據圖騰壓縮變形參數CMD2壓縮圖騰畫面的高度(垂直方向的長度)而產生壓縮後的圖騰畫面It8’’,並填補影像區塊Z3、Z4於壓縮後的圖騰畫面It8’’四周而產生測試畫面It10。測試畫面It10中水平線條Pa3、Pa4的寬度皆為W3,且W3小於W2、W1。由此可知,此兩條水平線條Pa3、Pa4將隨著測試畫面It8~It10的依序顯示而逐漸分別往畫面中心移動。For example, FIG. 7 is a schematic diagram of generating a test image according to totem compression deformation parameters according to an embodiment of the present invention. Please refer to Figures 5 and 7, the totem is set to include two horizontal lines Pa3 and Pa4. The
以下將進一步說明如何依據測試畫面與感光元件的亮度感測資訊來獲取畫面邊界參數。為了方便說明,以下實施例將以測試畫面中的圖騰為白色而畫面背景為黑色為例進行說明。The following will further explain how to obtain the frame boundary parameters according to the brightness sensing information of the test frame and the photosensitive element. For the convenience of description, the following embodiments will take the totem in the test screen as white and the screen background as black as an example for description.
圖8A與圖8B是依據本發明一實施例繪示的投影校正方法的示意圖。圖8A與圖8B係以依據圖騰位置參數改變測試畫面中圖騰位置且圖騰尺寸固定為例進行說明。8A and 8B are schematic diagrams of a projection correction method according to an embodiment of the invention. 8A and 8B are illustrated by taking as an example the totem position in the test screen is changed according to the totem position parameter and the totem size is fixed.
請參照圖8A,於水平對齊校正階段中,以圖6的測試畫面It5~It7為例,圖騰可包括兩條水平線條Pa1、Pa2,此兩條水平線條Pa1、Pa2將隨著測試畫面It5~It7的依序顯示而移動位置。Please refer to Fig. 8A. In the horizontal alignment correction stage, taking the test images It5~It7 of Fig. 6 as an example, the totem may include two horizontal lines Pa1 and Pa2, and these two horizontal lines Pa1 and Pa2 will follow the test images It5~ It7 is displayed in sequence while moving the position.
首先,投影裝置110投影測試畫面It5。由於由投影裝置110所投影的測試畫面It5中水平線條Pa1、Pa2並未覆蓋感光元件120_1~120_4,因此感光元件120_1~120_4感測到關聯於黑色畫面背景的第二感測值。感光元件120_1~120_4將第二感測值回報給運算裝置130,致使運算裝置130控制投影裝置110投影下一張測試畫面It6。由於由投影裝置110所投影的測試畫面It6中水平線條Pa1、Pa2並覆蓋感光元件120_1~120_4,因此感光元件120_1~120_4感測到關聯於白色圖騰的第一感測值。感光元件120_1~120_4將第一感測值回報給運算裝置130,致使運算裝置130控制投影裝置110投影下一張測試畫面It7。First, the
由於由投影裝置110所投影的測試畫面It7中水平線條Pa1、Pa2並未覆蓋感光元件120_1~120_4,因此感光元件120_1~120_4感測到關聯於黑色畫面背景的第二感測值。感光元件120_1~120_4將第二感測值回報給運算裝置130。反應於感光元件120_1~120_4的亮度感測資訊自第一感測值改變為第二感測值,運算裝置130可依據兩條水平線條Pa1、Pa2於測試畫面It6中的位置決定上下邊界參數Y1
、Y2
、Y3
、Y4
。更具體而言,藉由兩條水平線條Pa1、Pa2的掃描,運算裝置130可依據亮度感測資訊得知感光元件120_1~120_4位於測試畫面It6中水平線條Pa1、Pa2的涵蓋範圍中。因此,運算裝置130可依據測試畫面It6中水平線條於垂直軸向上的位置,決定畫面邊界參數中的上下邊界參數Y1
、Y2
、Y3
、Y4
。Since the horizontal lines Pa1 and Pa2 in the test image It7 projected by the
在一實施例中,測試畫面It6中水平線條Pa1位於垂直軸向上的Y軸像素座標Ya
與Y軸像素座標Yb
之間。基此,運算裝置130可依據Y軸像素座標Ya
與Y軸像素座標Yb
取得上下邊界參數Y1
。在一實施例中,運算裝置130可取介於Y軸像素座標Ya
與Y軸像素座標Yb
之間的其他Y軸像素座標作為上下邊界參數Y1
。以水平線條Pa1的寬度為8個像素為例,假設Y軸像素座標Ya
為8且Y軸像素座標Yb
為15,則運算裝置130可決定出上下邊界參數Y1
為11。相似的,運算裝置130也可依據測試畫面It6中水平線條Pa2位於垂直軸向上的Y軸像素座標Yc
與Y軸像素座標Yd
取得上下邊界參數Y3
。In one embodiment, the horizontal line Pa1 in the test image It6 is located between the Y-axis pixel coordinate Y a and the Y-axis pixel coordinate Y b on the vertical axis. Based on this, the
在圖8A的情境中,於投影It5~It7的過程中,感光元件120_1、120_2回報的亮度資訊是相同的,因此上下邊界參數Y1 與上下邊界參數Y2 是依據相同的圖騰位置(即Y軸像素座標Ya 與Y軸像素座標Yb )而決定。此外,於投影It5~It7的過程中,感光元件120_3、120_4回報的亮度資訊是相同的,因此上下邊界參數Y3 與上下邊界參數Y4 是依據相同的圖騰位置(即Y軸像素座標Yc 與Y軸像素座標Yd )而決定。In the scenario of FIG. 8A, during the projection of It5 to It7, the brightness information reported by the photosensitive elements 120_1 and 120_2 are the same. Therefore, the upper and lower boundary parameters Y 1 and the upper and lower boundary parameters Y 2 are based on the same totem position (ie Y Axis pixel coordinates Y a and Y axis pixel coordinates Y b ). In addition, in the process of projecting It5 to It7, the brightness information reported by the photosensitive elements 120_3 and 120_4 are the same. Therefore, the upper and lower boundary parameters Y 3 and the upper and lower boundary parameters Y 4 are based on the same totem position (that is, the Y-axis pixel coordinates Y c And Y-axis pixel coordinates Y d ).
值得一題的是,在一實施例中,在執行圖8A所示的流程之後,投影裝置110可以寬度更窄的水平線條(例如線條寬度可自8的像素更改為4個像素)掃描Y軸像素座標Ya
與Y軸像素座標Yb
之間的範圍,以獲取更精確的上下邊界參數。It is worth mentioning that, in one embodiment, after the process shown in FIG. 8A is executed, the
接著,請參照圖8B,於垂直對齊校正階段中,圖騰可包括兩條垂直線條Pa5、Pa6,此兩條水平線條Pa5、Pa6將隨著測試畫面It11~It13的依序顯示而移動位置。Next, referring to FIG. 8B, in the vertical alignment correction stage, the totem may include two vertical lines Pa5 and Pa6, and the two horizontal lines Pa5 and Pa6 will move positions as the test images It11 to It13 are sequentially displayed.
首先,投影裝置110投影測試畫面It11。由於由投影裝置110所投影的測試畫面It11中垂直線條Pa5、Pa6並未覆蓋感光元件120_1~120_4,因此感光元件120_1~120_4感測到關聯於黑色畫面背景的第二感測值。感光元件120_1~120_4將第二感測值回報給運算裝置130,致使運算裝置130控制投影裝置110投影下一張測試畫面It12。由於由投影裝置110所投影的測試畫面It12中垂直線條Pa5、Pa6覆蓋感光元件120_1~120_4,因此感光元件120_1~120_4感測到關聯於白色圖騰的第一感測值。感光元件120_1~120_4將第一感測值回報給運算裝置130,致使運算裝置130控制投影裝置110投影下一張測試畫面It13。First, the
由於由投影裝置110所投影的測試畫面It13中垂直線條Pa5、Pa6並未覆蓋感光元件120_1~120_4,因此感光元件120_1~120_4感測到關聯於黑色畫面背景的第二感測值。感光元件120_1~120_4將第二感測值回報給運算裝置130。反應於感光元件120_1~120_4的亮度感測資訊自第一感測值改變為第二感測值,運算裝置130可依據兩條垂直線條Pa5、Pa6於測試畫面It12中的位置決定左右邊界參數X1
、X2
、X3
、X4
。更具體而言,藉由兩條垂直線條Pa5、Pa6的掃描,運算裝置130可依據亮度感測資訊得知感光元件120_1~120_4位於測試畫面It12中垂直線條Pa5、Pa6的涵蓋範圍中。因此,運算裝置130可依據測試畫面It12中垂直線條Pa5、Pa6於水平軸向上的X軸像素座標Xa
、Xb
、Xc
、Xd
,決定畫面邊界參數中的左右邊界參數X1
、X2
、X3
、X4
。然而,決定左右邊界參數X1
、X2
、X3
、X4
的方式相似於決定上述邊界參數Y1
、Y2
、Y3
、Y4
的方式,於此不再贅述。Since the vertical lines Pa5 and Pa6 in the test image It13 projected by the
需說明的是,在圖8A與圖8B的情境中,感光元件120_1~120_4是被同一張測試畫面It6的水平線條Pa1、Pa2同時覆蓋,且感光元件120_1~120_4是被同一張測試畫面It12的垂直線條Pa5、Pa6同時覆蓋,但本發明並不限制於此。於其他應用場景中,感光元件120_1~120_4可以是被不同張測試畫面的圖騰覆蓋。亦即,分別對應至四個感光元件120_1~120_4的上下邊界參數Y1 、Y2 、Y3 、Y4 與左右邊界參數X1 、X2 、X3 、X4 可以是依據不同測試畫面中不同圖騰位置而決定。It should be noted that, in the context of FIGS. 8A and 8B, the photosensitive elements 120_1 to 120_4 are simultaneously covered by the horizontal lines Pa1 and Pa2 of the same test picture It6, and the photosensitive elements 120_1 to 120_4 are covered by the same test picture It12. The vertical lines Pa5 and Pa6 cover at the same time, but the present invention is not limited to this. In other application scenarios, the photosensitive elements 120_1 to 120_4 may be covered by totems of different test images. That is, the upper and lower boundary parameters Y 1 , Y 2 , Y 3 , Y 4 and the left and right boundary parameters X 1 , X 2 , X 3 , and X 4 corresponding to the four photosensitive elements 120_1 to 120_4 can be based on different test images. It depends on the position of the totem.
圖9A與圖9B是依據本發明一實施例繪示的投影校正方法的示意圖。圖9A與圖9B係以依據圖騰壓縮變形參數改變測試畫面中圖騰位置且圖騰尺寸不固定為例進行說明。9A and 9B are schematic diagrams of a projection correction method according to an embodiment of the invention. 9A and 9B are illustrated by taking as an example that the totem position in the test screen is changed according to the totem compression deformation parameter and the totem size is not fixed.
請參照圖9A,於水平對齊校正階段中,以圖7的測試畫面It8~It10為例,圖騰可包括兩條水平線條Pa3、Pa4,此兩條水平線條Pa3、Pa4將隨著測試畫面It8~It10的依序顯示而移動位置。Please refer to Fig. 9A. In the horizontal alignment correction stage, taking the test images It8~It10 of Fig. 7 as an example, the totem may include two horizontal lines Pa3 and Pa4. These two horizontal lines Pa3 and Pa4 will follow the test images It8~It8. It10 is displayed in order while moving the position.
首先,投影裝置110投影測試畫面It8。由於由投影裝置110所投影的測試畫面It8中水平線條Pa3、Pa4並未覆蓋感光元件120_1~120_4,因此感光元件120_1~120_4感測到關聯於黑色畫面背景的第二感測值。感光元件120_1~120_4將第二感測值回報給運算裝置130,致使運算裝置130控制投影裝置110投影下一張測試畫面It9。由於由投影裝置110所投影的測試畫面It9中水平線條Pa3、Pa4覆蓋感光元件120_1~120_4,因此感光元件120_1~120_4感測到關聯於白色圖騰的第一感測值。感光元件120_1~120_4將第一感測值回報給運算裝置130,致使運算裝置130控制投影裝置110投影下一張測試畫面It10。First, the
需說明的是,在一實施例中,測試畫面It9中的外圍影像區塊Z1、Z2也為黑色。由於由投影裝置110所投影的測試畫面It10中水平線條Pa3、Pa4並未覆蓋感光元件120_1~120_4,因此感光元件120_1~120_4感測到關聯於黑色畫面背景(即外圍影像區塊Z1、Z2)的第二感測值。感光元件120_1~120_4將第二感測值回報給運算裝置130。反應於感光元件120_1~120_4的亮度感測資訊自第一感測值改變為第二感測值,運算裝置130可依據兩條水平線條Pa3、Pa4於測試畫面It9中的位置決定上下邊界參數Y1
、Y2
、Y3
、Y4
。更具體而言,藉由兩條水平線條Pa3、Pa4的掃描,運算裝置130可依據亮度感測資訊得知感光元件120_1~120_4位於測試畫面It9中水平線條Pa3、Pa4的涵蓋範圍中。因此,運算裝置130可依據測試畫面It9中水平線條於垂直軸向上的位置,決定畫面邊界參數中的上下邊界參數Y1
、Y2
、Y3
、Y4
。需說明的是,兩條水平線條Pa3、Pa4的寬度將反應於用以產生測試畫面It8~It10的縮放倍率而逐漸變窄。相似於圖8A的說明,運算裝置130可依據測試畫面It9中水平線條Pa3、Pa4位於垂直軸向上的Y軸像素座標Ye
、Yf
、Yg
、Yh
取得上下邊界參數Y1
、Y2
、Y3
、Y4
。It should be noted that, in one embodiment, the peripheral image blocks Z1 and Z2 in the test frame It9 are also black. Since the horizontal lines Pa3 and Pa4 in the test image It10 projected by the
接著,請參照圖9B,於垂直對齊校正階段中,圖騰可包括兩條垂直線條Pa7、Pa8,此兩條垂直線條Pa7、Pa8將隨著測試畫面It14~It16的依序顯示而移動位置。測試畫面It15~It16分別包括影像區塊Z5、Z6、Z7、Z8,而影像區塊Z5、Z6、Z7、Z8可為黑色並視為畫面背景。相似於圖8A、圖8B與圖9A的操作流程,在依序顯示測試畫面It14~It16的過程中,反應於感光元件120_1~120_4的亮度感測資訊自第一感測值改變為第二感測值,運算裝置130可依據兩條垂直線條Pa7、Pa8於測試畫面It15中水平軸向上的X軸像素座標Xe
、Xf
、Xg
、Xh
決定左右邊界參數X1
、X2
、X3
、X4
。Next, referring to FIG. 9B, in the vertical alignment correction stage, the totem may include two vertical lines Pa7 and Pa8, and the two vertical lines Pa7 and Pa8 will move positions as the test images It14 to It16 are sequentially displayed. The test images It15 to It16 respectively include image blocks Z5, Z6, Z7, and Z8, and the image blocks Z5, Z6, Z7, and Z8 can be black and regarded as the screen background. Similar to the operation flow of FIG. 8A, FIG. 8B and FIG. 9A, in the process of sequentially displaying the test screens It14 to It16, the brightness sensing information reflected by the photosensitive elements 120_1 to 120_4 is changed from the first sensing value to the second sensing value. According to the measured value, the
參照圖8A、圖8B、圖9A、圖9B可知,經過水平對齊校正階段與垂直對齊校正階段的操作流程,運算裝置130可獲取上下邊界參數Y1
、Y2
、Y3
、Y4
與左右邊界參數X1
、X2
、X3
、X4
。藉此,投影裝置110可依據上下邊界參數Y1
、Y2
、Y3
、Y4
與左右邊界參數X1
、X2
、X3
、X4
對待投影影像進行影像變形處理而產生校正後畫面,上述影像變形處理可包括影像縮放處理或幾何變形處理,使校正後畫面中的畫面內容邊界的四個頂點座標分別為(X1
,Y1
)、(X2
,Y2
)、(X3
,Y3
)、(X4
,Y4
)。藉此,透過依據畫面邊界參數產生校正後畫面,投影裝置110的投影內容可對齊於邊框F1。Referring to FIGS. 8A, 8B, 9A, and 9B, it can be seen that after the operation flow of the horizontal alignment correction stage and the vertical alignment correction stage, the
圖10是依據本發明一實施例繪示的投影校正方法的示意圖。圖10係以依據圖騰位置參數改變測試畫面中圖騰位置且圖騰尺寸固定為例進行說明。請參照圖10,圖騰可包括兩條水平線條Pa9、Pa10與兩條垂直線條Pa11、Pa12,水平線條Pa9、Pa10與垂直線條Pa11、Pa12將隨測試畫面It20~It22的依序顯示而移動位置。水平線條Pa9、Pa10設置於測試畫面It20~It22的畫面下方,且垂直線條設置於測試畫面It20~It22的畫面上方。FIG. 10 is a schematic diagram of a projection correction method according to an embodiment of the present invention. FIG. 10 is an example of changing the totem position in the test screen according to the totem position parameter and the totem size is fixed as an example for illustration. 10, the totem may include two horizontal lines Pa9 and Pa10 and two vertical lines Pa11 and Pa12. The horizontal lines Pa9 and Pa10 and the vertical lines Pa11 and Pa12 will move positions as the test pictures It20-It22 are sequentially displayed. The horizontal lines Pa9 and Pa10 are arranged below the screens of the test images It20 to It22, and the vertical lines are arranged above the screens of the test images It20 to It22.
相似於圖8A、圖8B、圖9A與圖9B的操作流程,在依序顯示測試畫面It20~It22的過程中,反應於感光元件120_1~120_4的亮度感測資訊自第一感測值改變為第二感測值,運算裝置130可依據兩條垂直線條Pa11、Pa12於測試畫面It21中水平軸向上的位置決定左右邊界參數X1 、X2 ,並依據兩條水平線條Pa9、Pa10於測試畫面It21中垂直軸向上的位置決定下邊界參數Y3 、Y4 。Similar to the operation flow of FIGS. 8A, 8B, 9A, and 9B, in the process of sequentially displaying the test screens It20 to It22, the brightness sensing information reflected by the photosensitive elements 120_1 to 120_4 is changed from the first sensing value to For the second sensing value, the computing device 130 can determine the left and right boundary parameters X 1 and X 2 according to the position of the two vertical lines Pa11 and Pa12 on the horizontal axis of the test image It21, and determine the left and right boundary parameters X 1 and X 2 according to the two horizontal lines Pa9 and Pa10 on the test image. The upper position of the vertical axis in It21 determines the lower boundary parameters Y 3 and Y 4 .
於一實施例中,投影裝置110可依據左右邊界參數X1
、X2
與下邊界參數Y3
、Y4
來進行影像縮放處理而投影與邊框F1對齊的校正後畫面。於另一實施例中,在依序顯示測試畫面It20~It22之後,投影裝置10將投影水平線條設置於畫面上方且垂直線條設置於畫面下方的多張測試畫面,從而依序相似的操作流程獲取對應於感光元件120_3、120_4的左右邊界參數X3
、X4
以及對應於感光元件120_1、120_2上邊界參數Y1
、Y2
。之後,投影裝置110可依據左右邊界參數X1
、X2
、X3
、X4
與上下邊界參數Y1
、Y2
、Y3
、Y4
來進行影像縮放處理而投影與邊框F1對齊的校正後畫面。In one embodiment, the
然而,在一實施例中,在利用圖騰偵測邊框F1所界定的範圍之前,可執行環境偵測以確保感光元件120_1~120_4的設置位置被投影裝置110的投影範圍R1涵蓋,並將環境光源考慮進去而定義出適用於投影系統10所處環境的第一感測值與第二感測值。However, in one embodiment, before using the totem to detect the range defined by the frame F1, environment detection can be performed to ensure that the positions of the photosensitive elements 120_1 to 120_4 are covered by the projection range R1 of the
圖11是依據本發明一實施例繪示的投影校正方法的流程圖,而圖11的方法流程可以由圖1的投影校正系統10的各元件實現。請同時參照圖1及圖11,以下即搭配圖1中投影校正系統10的各項元件,說明本實施例之投影校正方法的步驟。FIG. 11 is a flowchart of a projection correction method according to an embodiment of the present invention, and the method flow of FIG. 11 can be implemented by the components of the
於步驟S1101,藉由投影裝置110投影第一預設畫面。此第一預設畫面的色彩相同於測試畫面中圖騰的色彩,例如,第一預設畫面可為一白畫面,且測試畫面中圖騰是白色的。於步驟S1102,藉由各感光元件120_1~120_4於投影裝置110投影第一預設畫面時量測第一亮度值。於步驟S1103,藉由各感光元件120_1~120_4於投影裝置110沒有投影第一預設畫面時量測第二亮度值。在一實施例中,各感光元件120_1~120_4可於投影裝置110投影第二預設畫面或不投影時量測第二亮度值。第二預設畫面的色彩相同於測試畫面中畫面背景的色彩。例如,第二預設畫面可為一黑畫面,且測試畫面中畫面背景是黑色的。也就是說,於一實施例中,投影裝置110可依序投影白畫面與黑畫面,而感光元件120_1~120_4可分別感測白畫面與黑畫面的亮度資訊(即第一亮度值與第二亮度值)。In step S1101, a first preset image is projected by the
於步驟S1104,依據第一亮度值與第二亮度值之間的差異值運算裝置130判斷投影裝置110的投影範圍R1是否涵蓋邊框F1上的感光元件120_1~120_4。具體而言,在投影範圍R1涵蓋邊框F1上的感光元件120_1~120_4的情況下,各感光元件120_1~120_4對白畫面進行亮度感測而產生的第一亮度值與對黑畫面(或不投影畫面)進行亮度感測而產生的第二亮度值之間的差異將大於門檻值。對應的,在投影範圍R1不涵蓋邊框F1上的感光元件120_1~120_4的情況下,各感光元件120_1~120_4對第一預設畫面進行亮度感測而產生的第一亮度值將相似於對第二預設畫面進行亮度感測而產生的第二亮度值,因此第一亮度值與第二亮度值之間的差異值將小於門檻值。亦即,運算裝置130可依據第一亮度值與第二亮度值之間的差異值是否大於門檻值來判定投影裝置110的投影範圍R1是否涵蓋邊框F1上的感光元件120_1~120_4。In step S1104, the
在確定投影裝置110的投影範圍R1涵蓋邊框F1上的感光元件120_1~120_4之後,第一亮度值與第二亮度值可用以決定第一感測值與第二感測值,而第一感測值與第二感測值後續將用以偵測感光元件120_1~120_4是否被測試畫面中的圖騰覆蓋。換言之,藉由步驟S1101~S1104的環境偵測流程,除了可確認投影裝置110的投影範圍R1是否涵蓋邊框F1上的感光元件120_1~120_4之外,運算裝置130可將第一感測值與第二感測值分別設定為於實際投影環境所量測的第一亮度值與第二亮度值。After determining that the projection range R1 of the
於步驟S1105,藉由投影裝置110投影多張測試畫面於投影幕S1上。於步驟S1106,於投影各測試畫面時,運算裝置130藉由位於投影幕S1的邊框F1上的多個感光元件120_1~120_4量測亮度感測資訊。於步驟S1107,反應於亮度感測資訊自第一感測值改變為第二感測值,運算裝置130依據圖騰於第一測試畫面中的第一位置決定畫面邊界參數。於步驟S1108,運算裝置130依據畫面邊界參數進行影像縮放處理而投影與投影幕S1的邊框F1對齊的校正後畫面。In step S1105, a plurality of test images are projected on the projection screen S1 by the
綜上所述,在本發明的實施例中,投影裝置將投影包括圖騰的多張測試畫面於投影幕上,且各張測試畫面中的圖騰位置是變動的。並且,當投影裝置投影這些測試畫面於投影幕上時,藉由設置於投影幕的邊框上的感光元件來感測測試畫面的亮度資訊。由於圖騰位置將隨著測試畫面的依序顯示而改變,因此可藉由持續地感測亮度感測資訊來偵測出感光元件相對於投影範圍的位置。由於感光元件是設置於邊框上,因此可依據感光元件相對於投影範圍的位置來決定畫面邊界參數。藉此,使投影機將依據畫面邊界參數進行影像縮放處理而產生可與投影幕的邊框對齊的校正後畫面,從而提供一種有效率且便利的投影校正方法。To sum up, in the embodiment of the present invention, the projection device projects a plurality of test images including totems on the projection screen, and the position of the totems in each test image is changed. Moreover, when the projection device projects these test images on the projection screen, the brightness information of the test images is sensed by the photosensitive element arranged on the frame of the projection screen. Since the position of the totem will change with the sequential display of the test images, the position of the photosensitive element relative to the projection range can be detected by continuously sensing the brightness sensing information. Since the photosensitive element is arranged on the frame, the image boundary parameters can be determined according to the position of the photosensitive element relative to the projection range. In this way, the projector will perform image scaling processing according to the image boundary parameters to generate a corrected image that can be aligned with the frame of the projection screen, thereby providing an efficient and convenient projection correction method.
此外,於本發明實施例中,由於使用者無需手動進行投影校正流程且無須考慮相機參數與相機校正,因而提供一種更便利且快速的投影校正方法。並且,藉由圖騰的掃描可獲取精確的畫面邊界參數,因此更進一步提升投影裝置的顯示品質。再者,本發明的其他目的和優點可以從本發明所揭露的技術特徵中得到進一步的了解。In addition, in the embodiment of the present invention, since the user does not need to manually perform the projection calibration process and does not need to consider the camera parameters and camera calibration, a more convenient and fast projection calibration method is provided. In addition, accurate picture boundary parameters can be obtained by scanning totems, thereby further improving the display quality of the projection device. Furthermore, other objectives and advantages of the present invention can be further understood from the technical features disclosed in the present invention.
雖然本發明已以實施例揭露如上,然其並非用以限定本發明,任何所屬技術領域中具有通常知識者,在不脫離本發明的精神和範圍內,當可作些許的更動與潤飾,故本發明的保護範圍當視後附的申請專利範圍所界定者為準。Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be subject to those defined by the attached patent application scope.
10:投影校正系統 110:投影裝置 111:圖騰產生模組 112:畫面變形模組 113:光閥模組 120_1~120_4:感光元件 130:運算裝置 S1:投影幕 F1:邊框 R1:投影範圍 L1:白色水平線條 L2:白色垂直線條 It1~It16、It21~It22、ImgT:測試畫面 CF1:校正後畫面 E1:影像內容邊界 Img_ori:原始影像 ZB:外圍影像區塊 CMD1:圖騰位置參數 CMD2:圖騰壓縮變形參數 ImgP:圖騰畫面 Pa1、Pa2、Pa3、Pa4、Pa9、Pa10:水平線條 It8’、It8’’:壓縮後的圖騰畫面 Z1、Z2、Z3、Z4、Z5、Z6、Z7、Z8:影像區塊 Pa5、Pa6、Pa7、Pa8、Pa11、Pa12:垂直線條 S201~S204、S1101~S1108:步驟10: Projection correction system 110: Projection device 111: Totem Generation Module 112: Screen Deformation Module 113: Light Valve Module 120_1~120_4: photosensitive element 130: computing device S1: Projection screen F1: Border R1: projection range L1: White horizontal lines L2: White vertical lines It1~It16, It21~It22, ImgT: test screen CF1: Picture after correction E1: Image content boundary Img_ori: Original image ZB: peripheral image block CMD1: Totem position parameter CMD2: Totem compression deformation parameters ImgP: Totem screen Pa1, Pa2, Pa3, Pa4, Pa9, Pa10: horizontal lines It8’, It8’’: Totem screen after compression Z1, Z2, Z3, Z4, Z5, Z6, Z7, Z8: image block Pa5, Pa6, Pa7, Pa8, Pa11, Pa12: vertical lines S201~S204, S1101~S1108: steps
圖1是依據本發明一實施例繪示的投影校正系統的示意圖。 圖2是依據本發明一實施例繪示的投影校正方法的流程圖。 圖3A與圖3B是依據本發明一實施例所繪示的測試畫面的範例。 圖4是依據本發明一實施例繪示的校正後畫面的示意圖。 圖5是依據本發明一實施例繪示的投影裝置的示意圖。 圖6是依據本發明一實施例繪示的依據圖騰位置參數產生測試畫面的示意圖。 圖7是依據本發明一實施例繪示的依據圖騰壓縮變形參數產生測試畫面的示意圖。 圖8A與圖8B是依據本發明一實施例繪示的投影校正方法的示意圖。 圖9A與圖9B是依據本發明一實施例繪示的投影校正方法的示意圖。 圖10是依據本發明一實施例繪示的投影校正方法的示意圖。 圖11是依據本發明一實施例繪示的投影校正方法的流程圖。FIG. 1 is a schematic diagram of a projection correction system according to an embodiment of the invention. FIG. 2 is a flowchart of a projection correction method according to an embodiment of the invention. 3A and 3B are examples of test screens drawn according to an embodiment of the invention. FIG. 4 is a schematic diagram of a corrected screen according to an embodiment of the invention. FIG. 5 is a schematic diagram of a projection device according to an embodiment of the invention. FIG. 6 is a schematic diagram of generating a test screen according to totem position parameters according to an embodiment of the present invention. FIG. 7 is a schematic diagram of a test screen generated according to totem compression deformation parameters according to an embodiment of the present invention. 8A and 8B are schematic diagrams of a projection correction method according to an embodiment of the invention. 9A and 9B are schematic diagrams of a projection correction method according to an embodiment of the invention. FIG. 10 is a schematic diagram of a projection correction method according to an embodiment of the present invention. FIG. 11 is a flowchart of a projection correction method according to an embodiment of the invention.
S201~S204:步驟 S201~S204: steps
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