WO2016197802A1 - 一种投影修正的方法及系统和终端 - Google Patents

一种投影修正的方法及系统和终端 Download PDF

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Publication number
WO2016197802A1
WO2016197802A1 PCT/CN2016/082527 CN2016082527W WO2016197802A1 WO 2016197802 A1 WO2016197802 A1 WO 2016197802A1 CN 2016082527 W CN2016082527 W CN 2016082527W WO 2016197802 A1 WO2016197802 A1 WO 2016197802A1
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Prior art keywords
image
target parameter
projector
projected image
projection
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PCT/CN2016/082527
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English (en)
French (fr)
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胡易木
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中兴通讯股份有限公司
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Publication of WO2016197802A1 publication Critical patent/WO2016197802A1/zh

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3185—Geometric adjustment, e.g. keystone or convergence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3188—Scale or resolution adjustment

Definitions

  • This document relates to, but is not limited to, projection technology, and more particularly to a method and system for projecting correction and a terminal.
  • the principle is to install a distance sensor or an auxiliary camera near the lens to measure the distance from the lens to the wall, and calculate and correct the focal length according to the distance from the lens to the wall.
  • the elevation angle of the lens is determined by the height sensor inside the projector, and the trapezoidal distortion is corrected according to the elevation angle of the lens.
  • the above solution requires the addition of a distance sensor or a camera, etc., which means an increase in hardware cost.
  • the projector's automatic correction distortion is only for the vertical direction of the trapezoidal distortion; if the projector is placed on the plane inclined in the horizontal direction, the projection wall is not flat, the lens itself is distorted, etc.
  • Image distortion such as barrel distortion
  • the related technology can only be corrected manually; also, because the camera itself is equipped with the camera to capture the image at the position of the projector, not the actual position of the observer, the distortion correction is not observed The correction of the angle of the person is not satisfactory.
  • WIFI wireless network
  • Wireless Fidelity Wireless Fidelity
  • the embodiment of the invention provides a method, a system and a terminal for projecting correction, which can improve the image correction function of the projector and improve the user experience without increasing the hardware cost of the projector.
  • An embodiment of the present invention provides a method for projecting correction, which is applied to a terminal, and the method includes:
  • the adjusting the control parameter to the target parameter according to the analysis of the image quality of the projected image, and sending the solution to the projector that establishes a connection with the terminal includes:
  • the correction control parameter is positively adjusted based on the second target parameter, if the first corrected projection If the image quality of the image is better than the image quality of the second modified projection image, the correction control parameter is inversely adjusted based on the first target parameter; and the correction is performed based on the second target parameter Control parameters are adjusted to a third target parameter and sent to the projector;
  • the target parameter includes: the first target parameter, the second target parameter, and the third target parameter;
  • the corrected projected image includes: the first corrected projected image and the second corrected Project an image.
  • the adjusting the control parameter to the target parameter according to the analysis of the image quality of the projected image, and sending the solution to the projector that establishes a connection with the terminal includes:
  • the fourth target parameter value includes the fifth target parameter value; wherein the target parameter includes: the fourth target parameter, the fifth target parameter.
  • the capturing a projected image includes:
  • the projected image is captured by the user actually observing the position of the projected image with the center point of the projected image as a focus point;
  • the projected image area accounts for not less than 50% of the total captured image area.
  • the analyzing the image quality of the projected image comprises:
  • An image focus quality and image distortion of the projected image are analyzed; wherein the image distortion comprises: keystone distortion, barrel distortion, horizontal distortion.
  • An embodiment of the present invention further provides a terminal, where the terminal includes an image capturing module and a processing module, where
  • the image capture module is configured to capture a projected image and analyze an image quality of the projected image
  • the processing module is configured to adjust the correction control parameter to the target parameter according to the analysis of the image quality, and send the solution to a projector that establishes a connection with the terminal; the target parameter is used to control the projector to correct the Project an image.
  • processing module is configured to:
  • the correction control parameter is positively adjusted based on the second target parameter, if the first corrected projection If the image quality of the image is better than the image quality of the second modified projection image, the correction control parameter is inversely adjusted based on the first target parameter; and the correction is performed based on the second target parameter Control parameters are adjusted to a third target parameter and sent to the projector;
  • the target parameter includes: the first target parameter, the second target parameter, and the third target parameter;
  • the corrected projected image includes: the first corrected projected image and the second corrected Project an image.
  • processing module is configured to:
  • the fourth target parameter value includes the fifth target parameter value; wherein The target parameter includes: the fourth target parameter, and the fifth target parameter.
  • the image capture module is configured to:
  • the projected image is captured by the user actually observing the position of the projected image with the center point of the projected image as a focus point;
  • the projected image area accounts for not less than 50% of the total captured image area.
  • processing module is configured to:
  • An image focus quality and image distortion of the projected image are analyzed; wherein the image distortion comprises: keystone distortion, barrel distortion, horizontal distortion.
  • the embodiment of the invention further provides a system for projecting correction, the system comprising a terminal and a projector; wherein
  • the terminal is configured to capture a projection image, adjust the correction control parameter to the target parameter according to the analysis of the image quality of the projection image, and send the solution to a projector that establishes a connection with the terminal; the target parameter is used for Controlling the projector to correct the projected image;
  • the projector is configured to correct the projected image based on the received target parameter.
  • the terminal captures the projected image; analyzes the image quality of the captured projected image to obtain a modified control parameter, adjusts the modified control parameter to the target parameter, and sends the corrected parameter to the target parameter
  • the terminal establishes a connected projector; the projector corrects the projected image according to the received target parameter.
  • the embodiment of the invention completes the image correction by cooperate with the projector by means of the image capturing function of the terminal located outside the projector, such as a mobile phone; thus, the image correction function of the projector can be improved without increasing the cost of the projector;
  • the correction of the projection distortion in the embodiment of the invention is corrected by the angle of the observer, and the horizontal direction distortion and the barrel distortion caused by the tilting of the projector, the unevenness of the projection wall surface, the distortion of the lens itself, etc. can be detected in time.
  • the image distortion is so that the correction effect is more accurate and more significant, which improves the user experience.
  • FIG. 1 is a schematic flowchart of a method for terminal side projection correction according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a system for projection correction according to an embodiment of the present invention.
  • FIG. 3 is a schematic flow chart of a method for correcting a focus of a mobile phone controlled projector according to an embodiment of the present invention
  • FIG. 4 is a flow chart of a method for controlling a projector to correct distortion by a mobile phone according to an embodiment of the present invention.
  • the terminal captures the projected image; analyzes the image quality of the captured projected image to obtain a modified control parameter, adjusts the modified control parameter to the target parameter, and sends the corrected parameter to the projector connected to the terminal; the projector according to the received target The parameter corrects the projected image.
  • the embodiment of the present invention detects and analyzes the image quality of the projected image at an observer's angle by means of an existing image capturing function of a terminal outside the projector such as a mobile phone.
  • a method for projecting correction according to an embodiment of the present invention is applicable to a terminal. As shown in FIG. 1, the method includes:
  • Step 101 Capture a projected image
  • the image capturing module in the terminal may be used to capture the projected image; the projected image may be captured at a position actually viewed by the user; when capturing the projected image, the center point of the projected image or the diagonal intersection of the projected image is used as a focus point;
  • the area of the projected image accounts for no less than 50% of the area of the captured image.
  • the captured projection image is an initial projection image
  • the projection image of the projector is corrected according to the initial projection image
  • Step 102 Analyze the image quality of the captured projected image to obtain a modified control parameter, adjust the modified control parameter to the target parameter, and send it to the projector that establishes a connection with the terminal; the target parameter is used to control the projector to correct the projected image.
  • analyzing the image quality of the captured projection image to obtain the correction control parameter comprises: calculating a correction control parameter for correcting the projection image according to the result of the analysis of the image quality of the captured projection image;
  • image quality includes: image focus quality And image distortion; image distortion, including keystone distortion, barrel distortion, horizontal distortion.
  • the degree of deformation of the four sides of the projected image may be used to calculate the degree of deformation of the projected image;
  • the characteristics of the projection include: projection lens characteristics, imaging characteristics of the imaging device, etc.;
  • the modified control parameters may include: projection focal length, graphic deformation adjustment parameters ( That is, a parameter for adjusting the color and/or intensity of each pixel in the projected image, etc.;
  • the correction control parameter may be a series of adjustment parameters for correcting the projected image.
  • the target parameter is used to control the projector to correct the projected image; after the terminal obtains the modified control parameter, the modified control parameter is sent to the projector in the form of the target parameter.
  • the transmission can send the target parameter in a wireless manner, and the wireless transmission can be performed by using WIFI, Bluetooth, Near Field Communication (NFC) or the like.
  • WIFI Wireless Fidelity
  • NFC Near Field Communication
  • the projector can adjust the focal length of the projection according to the received target parameter or correct the image to be projected, so that the quality of the projected image satisfies the viewing requirement of the user.
  • a projector with a wireless function can be used for image projection, and a camera with a camera function can be used for capturing a projected image.
  • the modified control parameter is set as the target parameter and transmitted to the projector wirelessly, and the projector receives the image according to the received image. Go to the target parameter to correct the lens or correct the image to be projected to achieve the purpose of correcting the projected image. Since the correction is performed based on the viewing screen of the actual viewing position of the user, the corrected projection image is closer to the viewing demand of the user.
  • the modified control parameter for correcting the projected image ie, the processing method for the distortion of the projected image
  • the projector that establishes the connection of the terminal includes: comparing the deviation between the preset ideal rectangle and the captured projection image (that is, comparing the parallelism of the edge of the projected image with the ideal rectangle and the aspect ratio), and obtaining the parameters of the corrected projection image by an algorithm.
  • the graphic deformation adjustment parameter ie, the graphic deformation adjustment parameter
  • the algorithm can be adjacent interpolation of the distortion correction of the projected image, bilinear Interpolation method, etc.
  • the at least one edge of the projected image is compared or coincident with at least one edge of the ideal rectangle.
  • the size of the ideal rectangle may be determined according to the size of the projected image, and the width of the ideal rectangle is greater than or equal to the shortest edge of the projected image.
  • the correction control parameter for correcting the projected image ie, the processing method for the focus quality of the projected image
  • the processing method for the focus quality of the projected image is calculated according to the characteristics of the projection, and is sent.
  • the projector for establishing a connection with the terminal further comprises: adjusting the correction control parameter to the first target parameter (ie, the first focal length of the projector), and capturing and analyzing the first corrected projection image (ie, calculating the first corrected projection image) Image quality, such as sharpness;; based on the first target parameter, randomly adjusting the correction control parameter, and adjusting the adjusted correction control parameter to the second target parameter (ie, the second focal length of the projector different from the first focal length) And capturing and analyzing the second corrected projection image (ie, calculating the image quality of the second modified projection image, such as sharpness); comparing the first corrected projected image with the second corrected projected image to estimate a trend of image quality change, according to the trend Correct the projected image again until the image quality is optimal.
  • steps 101 and 102 may be repeated a plurality of times to capture the projected image before and after the correction; optionally, the corrected and corrected projection images are acquired, and the quality of the focus before correction and the quality of the corrected focus are compared, thereby Estimate the trend; for example, the target parameter used is used to control the projector to increase the projection focal length when projecting, and the quality of the projected image captured by the terminal to increase the projection focal length becomes better than before the correction, then the next time it continues to increase is called forward Adjustment.
  • the focus quality of the captured image captured until the focal length is increased becomes worse, thus indicating that the previous target parameter can project the best quality image; if the target parameter is used to control the projector to increase the projection focal length during projection, When the contrast quality is deteriorated, the focus is reduced at the next adjustment, which is called reverse adjustment, until the focus quality of the captured image captured is reduced when the focus is reduced; the final target parameter is adjusted to be sent to the projector.
  • the method for processing image focus quality may include: exhausting all projection settings of the projector, the terminal uses all projection settings as correction control parameters, and the terminal will modify each of the projection parameters in the form of target parameters.
  • the projector is sent to the projector, and the projector sequentially projects; the terminal compares the projected images one by one to determine an image with the best image quality, and the target parameter corresponding to the projected image with the best image quality is used as the final projection setting.
  • the terminal includes an image capturing module and a processing module; wherein, the image capturing module is configured to capture a projected image; and analyze the captured projection Obtaining a control parameter for correcting the projected image, and adjusting the modified control parameter to the target parameter;
  • the image capturing module may be an image capturing function module in the user terminal, configured to: capture a projected image at a position actually viewed by the user; and capturing the projected image includes: when capturing the projected image, using a center point of the projected image The focus point at the time of capture; optionally, the area of the projected image accounts for not less than 50% of the total captured image area.
  • the processing module is configured to adjust the correction control parameter to the target parameter according to the analysis of the image quality, and send the solution to the projector that establishes a connection with the terminal; the target parameter is used to control the projector to correct the projected image;
  • the processing module is configured to obtain a modified control parameter by calculating a modified control parameter according to a result of image quality analysis of the projected image; wherein the image quality comprises: image focus quality and image distortion; Image distortion, including keystone distortion, barrel distortion, and horizontal distortion.
  • the degree of deformation of the four sides of the image may be used to calculate the degree of deformation of the image;
  • the characteristics of the projection include: projection lens characteristics, imaging characteristics of the imaging device, etc.;
  • the correction control parameters may include: projection focal length, graphic deformation adjustment parameters, etc.;
  • the control parameters can be a series of adjustment parameters for correcting the projected image.
  • the target parameter is used to control the projector to correct the projected image; after the terminal obtains the modified control parameter, the modified control parameter is sent to the projector in the form of the target parameter.
  • the transmission can be sent in a wireless manner to modify the control parameters, and the wireless transmission can be by using WIFI, Bluetooth, NFC, and the like.
  • a projector with a wireless function can be used for image projection, and a terminal with a camera function can be used for capturing a projected image.
  • the modified control parameter is calculated; then the modified control parameter is set as the target parameter and transmitted to the projector wirelessly, and the projector receives the image according to the received image. Go to the target parameter to correct the lens or correct the image to be projected to achieve the purpose of correcting the projected image. Since the correction is performed based on the viewing screen of the actual viewing position of the user, the corrected projection image is closer to the viewing demand of the user.
  • the processing module is configured to: compare a preset ideal rectangle with a captured Deviation of the projected image, the parameters of the corrected image are obtained by an algorithm, so that the image can be corrected to be as close as possible to the ideal rectangle, and the final target parameter is sent to the projector; wherein the algorithm can be a neighboring interpolation method for correcting the image deformation. , bilinear interpolation, and so on.
  • the processing module is further configured to: adjust the modified control parameter to the first target parameter, capture and analyze the first corrected projected image; and randomly adjust the modified control parameter based on the first target parameter, and The adjusted correction control parameter is adjusted to the second target parameter, and the second corrected projection image is captured and analyzed; the first corrected projection image and the second corrected projection image are compared, the image quality change trend is estimated, and the projected image is corrected again according to the change trend. Until the image quality is optimal.
  • the projected image before and after the correction can be captured multiple times; optionally, the corrected and corrected projection images are acquired, and the quality of the focus before correction and the quality of the corrected focus are compared to estimate the trend; for example:
  • the target parameter is used to control the projector to increase the projection focal length when projecting, and the quality of the projected image captured by the terminal to increase the projection focal length becomes better than before the correction, and the next step is to continue to increase the forward adjustment.
  • the focus quality of the captured image captured until the focal length is increased becomes worse, thus indicating that the previous target parameter can project the best quality image; if the target parameter is used to control the projector to increase the projection focal length during projection, When the contrast quality is deteriorated, the focus is reduced at the next adjustment, which is called reverse adjustment, until the focus quality of the captured image captured is reduced when the focus is reduced; the final target parameter is adjusted to be sent to the projector.
  • the processing module is further configured to: exhaust all projection settings of the projector, the terminal uses all projection settings as correction control parameters, and the terminal sets each projection setting of the modified control parameters in the form of target parameters.
  • the projector is sent to the projector, and the projector sequentially projects; the terminal compares the projected images one by one to determine an image with the best image quality, and the target parameter corresponding to the projected image with the best image quality is used as the final projection setting.
  • the image capture module can be combined with a camera module (such as a camera) of a terminal, a central processing unit (CPU), a microprocessor (MPU, a Microprocessor Unit), and a digital signal processor (DSP, Digital Signal Processing). ) or Field-Programmable Gate Array (FPGA) implementation; the processing module can be implemented by a wireless communication module of the terminal in combination with a CPU, an MPU, a DSP, or an FPGA.
  • a camera module such as a camera
  • CPU central processing unit
  • MPU microprocessor
  • DSP Digital Signal Processing
  • FPGA Field-Programmable Gate Array
  • a projection correction system provided by an embodiment of the present invention, as shown in FIG. 2, the system includes a terminal 21 and a projector 22;
  • the terminal 21 is configured to capture the projected image; analyze the image quality of the captured projected image to obtain a modified control parameter, adjust the modified control parameter to the target parameter and send it to the projector 22 that establishes a connection with the terminal; and the projector 22 is set to receive according to the receiving Correcting the projected image to the target parameter;
  • the processing module 212 is configured to send Correct the control parameters
  • the image capturing module 211 may be an image capturing function module in the user terminal; the captured image may be captured at a position actually viewed by the user; capturing the projected image includes: when capturing the projected image, using the projected image center point as a pair at the time of capturing Focus; better, the projected image area accounts for no less than 50% of the total captured image area.
  • the processing module 212 is configured to adjust the correction control parameter to the target parameter according to the analysis of the image quality, and send it to the projector 22 that establishes a connection with the terminal 21; the target parameter is used to control the projector 22 to correct the projected image;
  • Obtaining the correction control parameter includes: calculating the correction control parameter according to the image quality analysis result of the projection image; wherein the image quality includes: image focus quality and image distortion; image distortion, including trapezoidal distortion, barrel distortion Horizontal distortion.
  • the degree of deformation of the four sides of the image may be used to calculate the degree of deformation of the image;
  • the characteristics of the projection include: projection lens characteristics, imaging characteristics of the imaging device, etc.;
  • the correction control parameters may include: projection focal length, graphic deformation adjustment parameters, etc.;
  • the control parameters can be a series of adjustment parameters.
  • the target parameter is set to control the projector to correct the projected image; after the terminal obtains the modified control parameter, the modified control parameter is sent to the projector in the form of the target parameter.
  • the processing module 212 may send the modified control parameters in a wireless manner, and may use WIFI, Bluetooth, NFC, etc. to transmit by wireless.
  • the projector 22 includes a receiving module 221 and a projection correction module 222; wherein the receiving module 221 is configured to receive a target parameter; and the projection correction module 222 is configured to correct the projected image using the received target parameter.
  • the projector 22 can adjust the focal length of the projection according to the received target parameter or correct the image that needs to be projected, so that the quality of the projected image satisfies the viewing requirement of the user;
  • the projector 22 may be a projector with a wireless function, and the terminal 21 is a diagram.
  • the capture module 211 performs capture of the projected image. In this manner, after the image capturing module 211 captures the projected image, the image quality of the captured projected image is analyzed, and the modified control parameter is calculated; then the modified control parameter is set as the target parameter, and is sent to the projector 22 by wireless.
  • the projector 22 corrects the lens or corrects the image to be projected according to the received target parameter to achieve the purpose of correcting the projected image. Since the correction is performed based on the viewing screen of the actual viewing position of the user, the corrected projection image is closer to the viewing demand of the user.
  • the processing method for the image distortion may include: comparing the deviation between the ideal rectangle and the captured projection image, and obtaining a parameter of the corrected image by an algorithm, so that the image can be corrected to be as close as possible to the ideal rectangle, thereby being the final correction.
  • the control parameters are sent to the projector; wherein the algorithm may be a neighboring interpolation method, a bilinear interpolation method, or the like that corrects the image distortion.
  • the method for processing the image focus quality may include: comparing the pre-corrected and corrected projection images, estimating the image quality change trend, and correcting the projection image according to the change trend until the image quality is optimal.
  • the projected images before and after the correction may be captured multiple times for comparison to obtain the optimal target parameters; specifically, the corrected and corrected projection images are acquired, and the quality of the focus before correction and the quality of the corrected focus are compared. Therefore, the trend is estimated; for example, the target parameter used is used to control the projector to increase the projection focal length when projecting, and the quality of the projected image captured by the terminal to increase the projection focal length becomes better than before the correction, and the next time it continues to increase is called positive To adjust.
  • the focus quality of the captured image captured until the focal length is increased becomes worse, thus indicating that the previous target parameter can project the best quality image; if the target parameter is used to control the projector to increase the projection focal length during projection, When the comparison is made that the focus quality is deteriorated, the focus is reduced at the next adjustment, which is called reverse adjustment, until the focus quality of the captured image captured is reduced when the focus is reduced; the final target parameter is adjusted to be sent to the projector 22 .
  • the processing method for the image focus quality may further include: exhausting all projection settings of the projector, the terminal uses all projection settings as the correction control parameters, and the terminal will correct each of the projection parameters to the target.
  • the form of the parameter is sent to the projector, and the projector sequentially projects; the terminal compares the projected images one by one to determine an image with the best image quality, and the target parameter corresponding to the projected image with the best image quality is used as the final projection setting.
  • the image capturing module 211 can be implemented by the camera module of the terminal 21 in combination with a CPU, an MPU, a DSP, or an FPGA; and the processing module can be terminated by the wireless communication module of the terminal 21.
  • the implementation of the CPU, MPU, DSP, or FPGA; the projection correction module 222 can be implemented by the CPU, MPU, DSP, or FPGA of the projector 22.
  • Embodiment 1 Mobile phone control projector focus correction method
  • the terminal is a mobile phone, and the wireless mode used is short-range wireless communication.
  • the method for implementing focus correction in this embodiment includes:
  • Step 301 The mobile phone and the projector are powered on and the short-range wireless communication module is opened to establish a wireless connection;
  • Step 302 The mobile phone camera completes autofocus and fixes the focal length, and performs real-time image capture on the projected image;
  • the projected image should be completely displayed on the screen of the mobile phone and reach a certain display proportion, for example, not less than 50%, the mobile phone automatically selects the diagonal intersection of the projected image to perform camera focusing; The user should select the actual viewing position to perform the focusing operation.
  • Step 303 The mobile phone sends the projector lens target parameter to the projector
  • Step 304 The projector corrects the projection lens according to the received target parameter
  • Step 305 The mobile phone records and analyzes the focus quality
  • the mobile phone can compare the focus quality and the previous focus quality to estimate the change trend of the focus quality and speed up the focus speed; for example, this time makes the focal length increase, and after comparison, the focus quality becomes better, then the next Continue to increase once, until the focus quality continues to worsen; it is also possible to traverse the state supported by the projector to select the best quality; for example, the projector supports 20 focal lengths, where it can be projected once per focal length. Compare the quality of each projection and take the one with the best image quality for projection.
  • Step 306 The mobile phone selects an optimal lens parameter, and sends the optimal lens target parameter to the projector;
  • Step 307 The projector corrects the lens according to the received parameters to complete the focus.
  • Embodiment 2 Mobile phone control projector correction distortion method
  • the terminal is a mobile phone
  • the wireless mode used is short-range wireless communication.
  • the method for implementing the mobile phone to control the projector to correct distortion includes:
  • Step 401 The mobile phone and the projector are powered on and the short-range wireless communication module is opened to establish a wireless connection;
  • Step 402 The mobile phone calculates a difference between the projected image and the ideal image.
  • the projected image should be displayed completely on the screen of the mobile phone and reach a certain display ratio, such as not less than 50%.
  • the user should select the actual viewing position for the focus operation.
  • the mobile phone can select the center point of the two diagonal lines of the image as the center point of the ideal rectangle, calculate the deviation between the ideal rectangle and the actual projected image according to the focal length, and obtain an algorithm to correct the image parameters to correct the image as close as possible to the ideal rectangle.
  • Step 403 The mobile phone sends an image target parameter to the projector.
  • Step 404 The projector corrects the image according to the received parameter
  • Step 405 Complete the distortion correction.
  • Embodiments of the present invention also provide a computer readable storage medium storing computer executable instructions for performing any of the methods described above.
  • each module/unit in the foregoing embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program in a storage and a memory by a processor. / instruction to achieve its corresponding function.
  • the invention is not limited to any specific form of combination of hardware and software.
  • the above technical solution corrects the projection distortion by the angle of the observer, and can detect the horizontal direction distortion and the barrel distortion caused by the tilting of the projector, the unevenness of the projection wall surface, the distortion of the lens itself, and the like in time.
  • the image distortion is such that the correction effect is more accurate and more significant, thereby improving the user experience.

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Abstract

一种投影修正的方法，包括：捕获投影图像；分析所述捕获的投影图像的图像质量获得修正控制参数，将修正控制参数调整到目标参数，并发送给与所述终端建立连接的投影仪；所述目标参数用于控制投影仪修正所述投影图像。本发明还同时公开了一种终端、系统。

Description

一种投影修正的方法及系统和终端 技术领域
本文涉及但不限于投影技术，尤其涉及一种投影修正的方法及系统和终端。
背景技术
目前，很多投影仪带有自动对焦和投影图像校准功能；其实现原理是：在镜头附近加装距离传感器或者辅助摄像头来测量镜头到墙面的距离，根据镜头到墙面的距离计算和修正焦距；由投影仪内部的高度传感器来判断自身镜头的仰角，根据镜头的仰角来修正梯形失真。但是，上述方案需要外加距离传感器或者摄像头等，这意味着硬件成本的增加。另外，投影仪的自动修正失真也只针对了垂直方向的梯形失真；如果由于投影仪摆放在水平方向倾斜的平面上、投影墙面不平整、镜头自身失真等原因带来的水平方向失真及桶形失真等图像失真，相关技术只能通过手动修正；还有，由于投影仪自身带的摄像头是在投影仪所处位置采集图像，而不是观测者的实际位置，对失真的修正没有以观察者的角度来修正，带来的修正结果并不能令人满意。
目前，很多投影机已经自带无线网络(WIFI，Wireless Fidelity)等无线通信功能，如何利用投影机自带的功能，在不增加成本的情况下，完善投影仪的图像修正功能，是投影仪厂商亟待解决的问题。
发明内容
以下是对本文详细描述的主题的概述。本概述并非是为了限制权利要求的保护范围。
本发明实施例提供了一种投影修正的方法及系统和终端，能在不增加投影仪硬件成本的情况下，完善投影仪的图像修正功能，提升用户体验。
本发明实施例提供了一种投影修正的方法，应用于终端，所述方法包括：
捕获投影图像；
根据对所述投影图像的图像质量的分析，将修正控制参数调整到目标参数，并发送给与所述终端建立连接的投影仪；所述目标参数用于控制投影仪 修正所述投影图像。
可选的，所述根据对所述投影图像的图像质量的分析，将修正控制参数调整到目标参数，并发送给与所述终端建立连接的投影仪，包括：
将所述修正控制参数调整到第一目标参数，捕获并分析第一修正投影图像；
将所述修正控制参数调整到第二目标参数，捕获并分析第二修正投影图像；
如果所述第二修正投影图像的图像质量优于所述第一修正投影图像的图像质量，则以所述第二目标参数为基准正向调整所述修正控制参数，如果所述第一修正投影图像的图像质量优于所述第二修正投影图像的图像质量，则以所述第一目标参数为基准反向调整所述修正控制参数；以所述第二目标参数为基准，将所述修正控制参数调整到第三目标参数，并发送给所述投影仪；
所述目标参数包括：所述第一目标参数、所述第二目标参数和所述第三目标参数；所述修正的所述投影图像包括：所述第一修正投影图像和所述第二修正投影图像。
可选的，所述根据对所述投影图像的图像质量的分析，将修正控制参数调整到目标参数，并发送给与所述终端建立连接的投影仪，包括：
将所述修正控制参数调整到第四目标参数，所述第四目标参数控制所述投影仪在投影镜头投影范围内依次修正投影图像；
根据对所述依次修正投影图像的图像质量的分析，将所述修正控制参数调整到第五目标参数值；其中，所述第五目标参数值控制所述投影仪修正投影图像至最佳状态；所述第四目标参数值包括所述第五目标参数值；其中，所述目标参数包括：所述第四目标参数、所述第五目标参数。
可选的，所述捕获投影图像，包括：
在用户实际观测所述投影图像位置，以所述投影图像中心点为对焦点，捕获所述投影图像；
所述投影图像面积占整个捕获图像面积的比例不少于50％。
可选的，所述对所述投影图像的图像质量的分析包括：
分析所述投影图像的图像对焦质量和图像失真；其中所述图像失真包括：梯形失真、桶形失真、水平失真。
本发明实施例还提供了一种终端，所述终端包括图像捕获模块和处理模块；其中，
所述图像捕获模块，设置为捕获投影图像并分析所述投影图像的图像质量；
所述处理模块，设置为根据对所述图像质量的分析，将修正控制参数调整到目标参数，并发送给与所述终端建立连接的投影仪；所述目标参数用于控制投影仪修正所述投影图像。
可选的，所述处理模块，是设置为：
将所述修正控制参数调整到第一目标参数，捕获并分析第一修正投影图像；
将所述修正控制参数调整到第二目标参数，捕获并分析第二修正投影图像；
如果所述第二修正投影图像的图像质量优于所述第一修正投影图像的图像质量，则以所述第二目标参数为基准正向调整所述修正控制参数，如果所述第一修正投影图像的图像质量优于所述第二修正投影图像的图像质量，则以所述第一目标参数为基准反向调整所述修正控制参数；以所述第二目标参数为基准，将所述修正控制参数调整到第三目标参数，并发送给所述投影仪；
所述目标参数包括：所述第一目标参数、所述第二目标参数和所述第三目标参数；所述修正的所述投影图像包括：所述第一修正投影图像和所述第二修正投影图像。
可选的，所述处理模块，是设置为：
将所述修正控制参数调整到第四目标参数，所述第四目标参数控制所述投影仪在投影镜头投影范围内依次修正投影图像；
根据对所述依次修正投影图像的图像质量的分析，将所述修正控制参数调整到第五目标参数值；其中，所述第五目标参数值控制所述投影仪修正投影图像至最佳状态；所述第四目标参数值包括所述第五目标参数值；其中， 所述目标参数包括：所述第四目标参数、所述第五目标参数。
可选的，所述图像捕获模块是设置为：
在用户实际观测所述投影图像位置，以所述投影图像中心点为对焦点，捕获所述投影图像；
所述投影图像面积占整个捕获图像面积的比例不少于50％。
可选的，所述处理模块是设置为：
分析所述投影图像的图像对焦质量和图像失真；其中所述图像失真包括：梯形失真、桶形失真、水平失真。
本发明实施例还提供了一种投影修正的系统，所述系统包括终端和投影仪；其中，
所述终端，设置为捕获投影图像，根据对所述投影图像的图像质量的分析，将修正控制参数调整到目标参数，并发送给与所述终端建立连接的投影仪；所述目标参数用于控制投影仪修正所述投影图像；
所述投影仪，设置为根据接收到的所述目标参数修正所述投影图像。
本发明实施例所提供的投影修正的方法及系统和终端，终端捕获投影图像；分析所述捕获的投影图像的图像质量获得修正控制参数，将修正控制参数调整到目标参数并发送给与所述终端建立连接的投影仪；所述投影仪根据接收到的所述目标参数修正所述投影图像。本发明实施例借助于位于投影仪外的终端如手机的图像捕获功能，与投影仪配合完成图像修正；如此，能在不增加投影仪成本的情况下，完善投影仪的图像修正功能；并且，本发明实施例对投影失真的修正是以观察者的角度来修正，能及时检测到投影仪由于摆放倾斜、投影墙面不平整、镜头自身失真等原因带来的水平方向失真及桶形失真等等图像失真，使得修正效果更准确、更显著，进而提升了用户体验。
在阅读并理解了附图和详细描述后，可以明白其他方面。
附图概述
图1为本发明实施例一种终端侧投影修正的方法的流程示意图；
图2为本发明实施例一种投影修正的系统的组成结构示意图；
图3为本发明实施例手机控制投影仪对焦修正方法的流程示意图；
图4为本发明实施例手机控制投影仪修正失真方法的流程意图。
本发明的实施方式
为了便于本领域技术人员的理解，下面结合附图对本发明作进一步的描述，并不能用来限制本发明的保护范围。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的各种方式可以相互组合。
本发明实施例中，终端捕获投影图像；分析捕获的投影图像的图像质量获得修正控制参数，将修正控制参数调整到目标参数并发送给与终端建立连接的投影仪；投影仪根据接收到的目标参数修正投影图像。
这里，本发明实施例借助了投影仪外的终端如手机已有的图像捕获功能，以观察者的角度来检测和分析投影图像的图像质量。
下面结合实施例对本发明再作进一步详细的说明。
本发明实施例提供的一种投影修正的方法，适用于终端，如图1所示，方法包括：
步骤101：捕获投影图像；
这里，可以采用终端中图像捕获模块捕获投影图像；可以在用户实际观看的位置捕获投影图像；在捕获投影图像时，以投影图像的中心点或投影图像的对角线交叉点作为对焦点；可选的，投影图像的面积占捕获的图像面积的比例不少于50％。
本步骤中，捕获的投影图像为初始投影图像，后续根据初始投影图像对投影仪的投影图像进行修正。
步骤102：分析捕获的投影图像的图像质量获得修正控制参数，将修正控制参数调整到目标参数，并发送给与终端建立连接的投影仪；目标参数用于控制投影仪修正投影图像。
本步骤中，分析捕获的投影图像的图像质量获得修正控制参数包括：根据对捕获的投影图像的图像质量进行分析得到的结果，依据投影的特性计算出用于修正投影图像的修正控制参数；其中，图像质量包括：图像对焦质量 和图像失真；图像失真，包括梯形失真、桶形失真、水平失真。
这里，可以采用对投影图像四边的弯曲程度的分析来计算投影图像的变形程度；投影的特性包括：投影镜头特性，成像器件成像特性等；修正控制参数可以包括：投影焦距，图形变形调整参数(即用于调整投影图像中每一个像素的颜色和/或强度的参数)等；修正控制参数可以是一系列的用于修正投影图像的调整参数。
目标参数用于控制投影仪修正投影图像；终端获得修正控制参数后，将修正控制参数以目标参数的形式发送给投影仪。
发送可以采用无线方式来发送目标参数，采用无线方式发送可以是采用WIFI、蓝牙、近场通讯(NFC，Near Field Communication)等。
可选的，投影仪可以根据接收到的目标参数调整投影的焦距或修正需要投影的图像，使投影图像的质量满足用户的观看需求。
可选的，可以采用带无线功能的投影仪来进行图像投影，采用带摄像功能的终端进行投影图像的捕获。如此，终端捕获投影图像后，经过对所捕获投影图像的图像质量进行分析，计算得出修正控制参数；再将修正控制参数设置成目标参数，并通过无线方式发送给投影仪，投影仪根据接收到的目标参数来修正镜头或修正要投影的图像，以达到修正投影图像的目的。由于修正是基于用户的实际观察位置的观看画面来进行的，因此，修正过的投影图像更贴近用户的观看需求。
可选的，根据对捕获的投影图像的图像质量进行分析得到的结果，依据投影的特性计算出用于修正投影图像的修正控制参数(即对投影图像失真的处理方法)，并发送给与所述终端建立连接的投影仪包括：比较预先设置的理想长方形与捕获的投影图像的偏差(即比较投影图像的边沿和理想长方形的平行程度及长宽比例)，通过算法得出修正投影图像的参数(即图形变形调整参数)，使投影图像可以修正到尽可能接近理想长方形，以此为最终的目标参数发送给投影仪；其中，算法可以是对投影图像变形修正的邻近插值法、双线性内插法等。
在比较投影图像的边沿和理想长方形的平行程度及长宽比例时，可以使 投影图像的至少一条边与理想长方形的至少一条边平行或重合来进行比较，理想长方形的大小可以根据投影图像的大小来确定，理想长方形的宽大于或等于投影图像的最短的一条边。
本发明实施例中，根据对捕获的投影图像的图像质量进行分析得到的结果，依据投影的特性计算出用于修正投影图像的修正控制参数(即对投影图像对焦质量的处理方法)，并发送给与所述终端建立连接的投影仪还包括：将修正控制参数调整到第一目标参数(即投影仪的第一焦距)，捕获并分析第一修正投影图像(即计算第一修正投影图像的图像质量，如清晰度)；以第一目标参数为基准，随机调整修正控制参数，并将调整后的修正控制参数调整到第二目标参数(即投影仪的与第一焦距不同的第二焦距)，捕获并分析第二修正投影图像(即计算第二修正投影图像的图像质量，如清晰度)；对比第一修正投影图像和第二修正投影图像，估算出图像质量变化趋势，根据变化趋势再次修正投影图像，直至图像质量最佳。在实际应用中，可以多次重复步骤101和步骤102来捕获修正前后的投影图像；可选的，获取修正前和修正后的投影图像，对比修正前的对焦质量和修正后的对焦质量，从而估算出趋势；比如：采用的目标参数用于控制投影仪在投影时增大投影焦距，终端捕获到增大投影焦距的投影图像质量较修正之前变好，则下一次继续加大称为正向调整。直到增大焦距时捕获的投影图像的对焦质量反而变差，这样，表明前一次的目标参数可以投影出质量最好的图像；如果采用目标参数用于控制投影仪在投影时增大投影焦距，对比得知对焦质量变差，则下一次调整时减小焦距，称为反向调整，直到减小焦距时捕获的投影图像的对焦质量反而变差；以调整的最终目标参数发送给投影仪。
可选的，对于图像对焦质量的处理方法可以包括：穷举投影仪的所有的投影设置，终端将所有投影设置作为修正控制参数，终端将修正控制参数中每一种投影设置以目标参数的形式发送给投影仪，投影仪依次投影；终端逐一比较投影图像，确定图像质量最优的一张，并将图像质量最优的投影图像对应的目标参数作为最终选用的投影设置。
本发明实施例提供的一种终端，参照图2所示，终端包括图像捕获模块和处理模块；其中，图像捕获模块，设置为捕获投影图像；分析捕获的投影 图像的图像质量获得用于修正投影图像的修正控制参数，将修正控制参数调整到目标参数；
可选的，图像捕获模块可以是用户终端中的图像捕获功能模块，是设置为：在用户实际观看的位置进行捕获投影图像；捕获投影图像包括：在捕获投影图像时，以投影图像中心点作为捕获时的对焦点；可选的，投影图像的面积占整个捕获的图像面积的比例不少于50％。
处理模块，设置为根据对图像质量的分析，将修正控制参数调整到目标参数，并发送给与终端建立连接的投影仪；目标参数用于控制投影仪修正投影图像；
所述处理模块是设置为采用以下方式实现获得修正控制参数：根据对投影图像的图像质量分析的结果，依据投影的特性计算出修正控制参数；其中，图像质量包括：图像对焦质量和图像失真；图像失真，包括梯形失真、桶形失真、水平失真。这里，可以采用对图像四边的弯曲程度的分析来计算图像的变形程度；投影的特性包括：投影镜头特性，成像器件成像特性等；修正控制参数可以包括：投影焦距，图形变形调整参数等；修正控制参数可以是一系列的用于修正投影图像的调整参数。
目标参数用于控制投影仪修正投影图像；终端获得修正控制参数后，将修正控制参数以目标参数的形式发送给投影仪。
发送可以采用无线方式来发送修正控制参数，采用无线方式发送可以是采用WIFI、蓝牙、NFC等。
本发明实施例中，可以采用带无线功能的投影仪来进行图像投影，采用带摄像功能的终端进行投影图像的捕获。如此，终端捕获投影图像后，经过对所捕获投影图像的图像质量进行分析，计算得出修正控制参数；再将修正控制参数设置成目标参数，并通过无线方式发送给投影仪，投影仪根据接收到的目标参数来修正镜头或修正要投影的图像，以达到修正投影图像的目的。由于修正是基于用户的实际观察位置的观看画面来进行的，因此，修正过的投影图像更贴近用户的观看需求。
可选的，所述处理模块是设置为：比较预先设置的理想长方形与捕获的 投影图像的偏差，通过算法得出修正图像的参数，使图像可以修正到尽可能接近理想长方形，以此为最终的目标参数发送给投影仪；其中，算法可以是对图像变形修正的邻近插值法、双线性内插法等。
本发明实施例中，所述处理模块还设置为：将修正控制参数调整到第一目标参数，捕获并分析第一修正投影图像；以第一目标参数为基准，随机调整修正控制参数，并将调整后的修正控制参数调整到第二目标参数，捕获并分析第二修正投影图像；对比第一修正投影图像和第二修正投影图像，估算出图像质量变化趋势，根据变化趋势再次修正投影图像，直至图像质量最佳。
在实际应用中，可以多次捕获修正前后的投影图像；可选的，获取修正前和修正后的投影图像，对比修正前的对焦质量和修正后的对焦质量，从而估算出趋势；比如：采用的目标参数用于控制投影仪在投影时增大投影焦距，终端捕获到增大投影焦距的投影图像质量较修正之前变好，则下一次继续加大称为正向调整。直到增大焦距时捕获的投影图像的对焦质量反而变差，这样，表明前一次的目标参数可以投影出质量最好的图像；如果采用目标参数用于控制投影仪在投影时增大投影焦距，对比得知对焦质量变差，则下一次调整时减小焦距，称为反向调整，直到减小焦距时捕获的投影图像的对焦质量反而变差；以调整的最终目标参数发送给投影仪。
本发明实施例中，所述处理模块还设置为：穷举投影仪的所有的投影设置，终端将所有投影设置作为修正控制参数，终端将修正控制参数中每一种投影设置以目标参数的形式发送给投影仪，投影仪依次投影；终端逐一比较投影图像，确定图像质量最优的一张，并将图像质量最优的投影图像对应的目标参数作为最终选用的投影设置。
在实际应用中，图像捕获模块可由终端的摄像模块(如摄像头等)结合中央处理器(CPU，Central Processing Unit)、微处理器(MPU，Microprocessor Unit)、数字信号处理器(DSP，Digital Signal Processing)、或现场可编程门阵列(FPGA，Field-Programmable Gate Array)等实现；处理模块可由终端的无线通信模块结合CPU、MPU、DSP、或FPGA等实现。
本发明实施例提供的一种投影修正的系统，如图2所示，系统包括终端21和投影仪22；其中，
终端21，设置为捕获投影图像；分析捕获的投影图像的图像质量获得修正控制参数，将修正控制参数调整到目标参数并发送给与终端建立连接的投影仪22；投影仪22，设置为根据接收到的目标参数修正投影图像；
可选的，终端21包括图像捕获模块211和处理模块212；其中，图像捕获模块211，设置为实时捕获投影图像；分析捕获的投影图像的图像质量获得修正控制参数；处理模块212，设置为发送修正控制参数；
这里，图像捕获模块211可以是用户终端中的图像捕获功能模块；可以在用户实际观看的位置进行捕获投影图像；捕获投影图像包括：在捕获投影图像时，以投影图像中心点作为捕获时的对焦点；更优的，投影图像面积占整个捕获图像面积的比例不少于50％。
处理模块212，设置为根据对图像质量的分析，将修正控制参数调整到目标参数，并发送给与终端21建立连接的投影仪22；目标参数用于控制投影仪22修正投影图像；
获得修正控制参数包括：根据对投影图像的图像质量分析的结果，依据投影的特性计算出修正控制参数；其中，图像质量包括：图像对焦质量和图像失真；图像失真，包括梯形失真、桶形失真、水平失真。这里，可以采用对图像四边的弯曲程度的分析来计算图像的变形程度；投影的特性包括：投影镜头特性，成像器件成像特性等；修正控制参数可以包括：投影焦距，图形变形调整参数等；修正控制参数可以是一系列的调整参数。
目标参数设置为控制投影仪修正投影图像；终端获得修正控制参数后，将修正控制参数以目标参数的形式发送给投影仪。
处理模块212可以采用无线方式来发送修正控制参数，采用无线方式发送可以是采用WIFI、蓝牙、NFC等。
投影仪22包括接收模块221和投影修正模块222；其中，接收模块221，设置为接收目标参数；投影修正模块222，设置为采用收到的目标参数修正投影图像。投影仪22可以根据接收到的目标参数调整投影的焦距或修正需要投影的图像，使投影图像的质量满足用户的观看需求；
本发明实施例中，投影仪22可以是带无线功能的投影仪，终端21的图 像捕获模块211进行投影图像的捕获。如此，图像捕获模块211捕获投影图像后，经过对所捕获投影图像的图像质量进行分析，计算得出修正控制参数；再将修正控制参数设置成目标参数，并通过无线方式发送给投影仪22，投影仪22根据接收到的目标参数来修正镜头或修正要投影的图像，以达到修正投影图像的目的。由于修正是基于用户的实际观察位置的观看画面来进行的，因此，修正过的投影图像更贴近用户的观看需求。
可选的，对于图像失真的处理方法可以包括：比较理想长方形与捕获的投影图像的偏差，通过算法得出修正图像的参数，使图像可以修正到尽可能接近理想长方形，以此为最终的修正控制参数发送给投影仪；其中，算法可以是对图像变形修正的邻近插值法、双线性内插法等。
本发明实施例中，对于图像对焦质量的处理方法可以包括：对比修正前和修正后的投影图像，估算出图像质量变化趋势，根据变化趋势再次修正投影图像，直至图像质量最佳。在实际应用中，可以多次捕获修正前后的投影图像进行比较，以获得最佳目标参数；具体的，获取修正前和修正后的投影图像，对比修正前的对焦质量和修正后的对焦质量，从而估算出趋势；比如：采用的目标参数用于控制投影仪在投影时增大投影焦距，终端捕获到增大投影焦距的投影图像质量较修正之前变好，则下一次继续加大称为正向调整。直到增大焦距时捕获的投影图像的对焦质量反而变差，这样，表明前一次的目标参数可以投影出质量最好的图像；如果采用目标参数用于控制投影仪在投影时增大投影焦距，对比得知对焦质量变差，则下一次调整时减小焦距，称为反向调整，直到减小焦距时捕获的投影图像的对焦质量反而变差；以调整的最终目标参数发送给投影仪22。
本发明实施例中，对于图像对焦质量的处理方法还可以包括：穷举投影仪的所有的投影设置，终端将所有投影设置作为修正控制参数，终端将修正控制参数中每一种投影设置以目标参数的形式发送给投影仪，投影仪依次投影；终端逐一比较投影图像，确定图像质量最优的一张，并将图像质量最优的投影图像对应的目标参数作为最终选用的投影设置。
在实际应用中，图像捕获模块211可由终端21的摄像模块结合CPU、MPU、DSP、或FPGA等实现；212处理模块可由终端21的无线通信模块结 合CPU、MPU、DSP、或FPGA等实现；投影修正模块222可由投影仪22的CPU、MPU、DSP、或FPGA等实现。
下面结合两个具体实施例对本发明作进一步详细的描述。
实施例1：手机控制投影仪对焦修正方法
本实施例中，终端为手机，所采用的无线方式为短距无线通信；具体的，如图3所示，本实施例实现对焦修正的方法包括：
步骤301：手机及投影仪开机并打开短距无线通讯模块建立无线连接；
步骤302：手机摄像头完成自动对焦并固定焦距，对投影图像进行实时图像捕获；
这里，在对投影图像进行图像捕获时，投射图像应完整显示在手机屏幕上，并达到一定显示占比，比如不小于50％，手机自动选择投射图像的对角线交叉点进行摄像头对焦；并且，用户应选择实际观看的位置进行对焦操作。
步骤303：手机发送投影仪镜头目标参数给投影仪；
步骤304：投影仪根据接收到的目标参数修正投影镜头；
步骤305：手机记录并分析对焦质量；
这里，手机可以对比本次的对焦质量和上一次的对焦质量，从而估算出对焦质量的变化趋势，加快对焦速度；比如：本次使得焦距加大，经对比得知对焦质量变好，则下一次继续加大，直到继续加大对焦质量反而变差；也可以遍历投影仪支持的状态，选取最佳的质量；例如：投影仪支持20个焦距，这里，可以在每个焦距上投影一次，比较每一次投影的质量，取图像质量最优的一个进行投影。
步骤306：手机挑选最佳镜头参数，并将最佳镜头目标参数发送给投影仪；
步骤307：投影仪根据接收到的参数修正镜头，完成对焦。
实施例2：手机控制投影仪修正失真方法
本实施例中，终端为手机，所采用的无线方式为短距无线通信；具体的，如图4所示，本实施例实现手机控制投影仪修正失真的方法包括：
步骤401：手机及投影仪开机并打开短距无线通讯模块建立无线连接；
步骤402：手机计算出投射图像和理想图像间的差值；
这里，投射图像应完整显示在手机屏幕上，并达到一定显示占比，比如不小于50％。用户应选择实际观看的位置进行对焦操作。手机可选择图像两个对角线的中心点作为理想长方形的中心点，根据焦距计算理想长方形与实际投射图像的偏差，通过算法得出如何修正图像参数将图像修正到尽可能接近理想长方形。
步骤403：手机发送图像目标参数给投影仪；
步骤404：投影仪根据接收到的参数修正图像；
步骤405：完成失真修正。
本发明实施例还提出了一种计算机可读存储介质，存储有计算机可执行指令，计算机可执行指令用于执行上述描述的任意一个方法。
本领域普通技术人员可以理解上述方法中的全部或部分步骤可通过程序来指令相关硬件(例如处理器)完成，所述程序可以存储于计算机可读存储介质中，如只读存储器、磁盘或光盘等。可选地，上述实施例的全部或部分步骤也可以使用一个或多个集成电路来实现。相应地，上述实施例中的各模块/单元可以采用硬件的形式实现，例如通过集成电路来实现其相应功能，也可以采用软件功能模块的形式实现，例如通过处理器执行存储与存储器中的程序/指令来实现其相应功能。本发明不限于任何特定形式的硬件和软件的结合。
以上所述，仅为本发明的佳实施例而已，并非用于限定本发明的保护范围，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。
工业实用性
上述技术方案对投影失真的修正是以观察者的角度来修正，能及时检测到投影仪由于摆放倾斜、投影墙面不平整、镜头自身失真等原因带来的水平方向失真及桶形失真等等图像失真，使得修正效果更准确、更显著，进而提升了用户体验。

Claims (11)

  1. 一种投影修正的方法，应用于终端，所述方法包括：
    捕获投影图像；
    分析捕获的投影图像的图像质量获得修正控制参数，将修正控制参数调整到目标参数，并发送给与所述终端建立连接的投影仪；所述目标参数用于控制投影仪修正所述投影图像。
  2. 根据权利要求1所述的方法，其中，所述分析捕获的投影图像的图像质量获得修正控制参数，将修正控制参数调整到目标参数，并发送给与所述终端建立连接的投影仪，包括：
    将所述修正控制参数调整到第一目标参数，捕获并分析第一修正投影图像；
    将所述修正控制参数调整到第二目标参数，捕获并分析第二修正投影图像；
    如果所述第二修正投影图像的图像质量优于所述第一修正投影图像的图像质量，则以所述第二目标参数为基准正向调整所述修正控制参数；
    如果所述第一修正投影图像的图像质量优于所述第二修正投影图像的图像质量，以所述第一目标参数为基准反向调整所述修正控制参数；以所述第二目标参数为基准，将所述修正控制参数调整到第三目标参数，并发送给所述投影仪；
    所述目标参数包括：所述第一目标参数、所述第二目标参数和所述第三目标参数；所述修正的所述投影图像包括：所述第一修正投影图像和所述第二修正投影图像。
  3. 根据权利要求1所述的方法，其中，所述根据对所述投影图像的图像质量的分析，将修正控制参数调整到目标参数，并发送给与所述终端建立连接的投影仪，包括：
    将所述修正控制参数调整到第四目标参数，所述第四目标参数控制所述投影仪在投影镜头投影范围内依次修正投影图像；
    根据对所述依次修正投影图像的图像质量的分析，将所述修正控制参数调整到第五目标参数值；其中，所述第五目标参数值控制所述投影仪修正投影图像至最佳状态；所述第四目标参数值包括所述第五目标参数值；其中，所述目标参数包括：所述第四目标参数、所述第五目标参数。
  4. 根据权利要求1至3任一项所述的方法，其中，所述捕获投影图像包括：
    在用户实际观测所述投影图像的位置，以所述投影图像的中心点为对焦点，捕获所述投影图像；
    所述投影图像的面积占整个捕获的图像面积的比例不少于50％。
  5. 根据权利要求1至3任一项所述的方法，其中，所述对所述投影图像的图像质量的分析包括：
    分析所述投影图像的图像对焦质量和图像失真；其中所述图像失真包括：梯形失真、桶形失真、水平失真。
  6. 一种终端，所述终端包括图像捕获模块和处理模块；其中，
    所述图像捕获模块，设置为捕获投影图像并分析所述投影图像的图像质量；
    所述处理模块，设置为根据对所述图像质量的分析，将修正控制参数调整到目标参数，并发送给与所述终端建立连接的投影仪；所述目标参数用于控制投影仪修正所述投影图像。
  7. 根据权利要求6所述的终端，其中，所述处理模块，是设置为：
    将所述修正控制参数调整到第一目标参数，捕获并分析第一修正投影图像；
    将所述修正控制参数调整到第二目标参数，捕获并分析第二修正投影图像；
    如果所述第二修正投影图像的图像质量优于所述第一修正投影图像的图像质量，则以所述第二目标参数为基准正向调整所述修正控制参数，如果所述第一修正投影图像的图像质量优于所述第二修正投影图像的图像质量，则以所述第一目标参数为基准反向调整所述修正控制参数；以所述第二目标参 数为基准，将所述修正控制参数调整到第三目标参数，并发送给所述投影仪；
    所述目标参数包括：所述第一目标参数、所述第二目标参数和所述第三目标参数；所述修正的所述投影图像包括：所述第一修正投影图像和所述第二修正投影图像。
  8. 根据权利要求6所述的终端，其中，所述处理模块，是设置为：
    将所述修正控制参数调整到第四目标参数，所述第四目标参数控制所述投影仪在投影镜头投影范围内依次修正投影图像；
    根据对所述依次修正投影图像的图像质量的分析，将所述修正控制参数调整到第五目标参数值；其中，所述第五目标参数值控制所述投影仪修正投影图像至最佳状态；所述第四目标参数值包括所述第五目标参数值；其中，所述目标参数包括：所述第四目标参数、所述第五目标参数。
  9. 根据权利要求6至8任一项所述的终端，其中，所述捕获模块是设置为：
    在用户实际观测所述投影图像位置，以所述投影图像中心点为对焦点，捕获所述投影图像；
    所述投影图像的面积占整个捕获的图像面积的比例不少于50％。
  10. 根据权利要求6至8任一项所述的终端，其中，所述处理模块是设置为：
    分析所述投影图像的图像对焦质量和图像失真；其中所述图像失真包括：梯形失真、桶形失真、水平失真。
  11. 一种投影修正的系统，所述系统包括终端和投影仪；其中，
    所述终端，设置为捕获投影图像，根据对所述投影图像的图像质量的分析，将修正控制参数调整到目标参数，并发送给与所述终端建立连接的投影仪；所述目标参数用于控制投影仪修正所述投影图像；
    所述投影仪，设置为根据接收到的所述目标参数修正所述投影图像。
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