WO2017049936A1 - 一种获取投影仪的最佳投影焦点的方法及系统 - Google Patents
一种获取投影仪的最佳投影焦点的方法及系统 Download PDFInfo
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- WO2017049936A1 WO2017049936A1 PCT/CN2016/083254 CN2016083254W WO2017049936A1 WO 2017049936 A1 WO2017049936 A1 WO 2017049936A1 CN 2016083254 W CN2016083254 W CN 2016083254W WO 2017049936 A1 WO2017049936 A1 WO 2017049936A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/28—Systems for automatic generation of focusing signals
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- 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
Definitions
- the present invention relates to the field of projection technology, and in particular, to a method and system for acquiring an optimal projection focus of a projector.
- a projector also known as a projector, is a device that projects images or video onto a screen and is widely used in homes, offices, schools, and entertainment venues.
- the projector can also be connected to computers, VCD, DVD, BD, game consoles, DV and other devices through different interfaces to receive video signals of different devices, and the device restrictions on the video input terminal are small.
- the projector is divided into CRT projector, LCD projector, DLP projector and so on.
- the projector projects an image or video through the projection lens
- the sharpness of the image or video projected by the projector changes.
- most of the prior art manually adjusts the projection focus of the projection lens by manually adjusting the projection focus of the projection lens while viewing the projection image, finding the best projection image or video, very inconvenient.
- the technical problem to be solved by the present invention is to provide a method and system for obtaining an optimal projection focus of a projector, which can conveniently obtain an optimal projection focus of the projector.
- a technical solution adopted by the present invention is to provide a method for automatically focusing a projector, comprising: causing the projector to project a projection image to a projection area, and collecting a projection area including the projector at a first environment image; enabling the projector to stop projecting a projection image to the projection area, and acquiring a second environment image including the projection area; extracting according to the first environment image and the second environment image Projecting a picture; calculating a sharpness of the projected picture according to an image sharpness evaluation algorithm; recording a projection focus at which the projector is currently located, and establishing a correspondence between a sharpness of the projected picture and the projected focus Adjusting the projection focus of the projector and returning the step of projecting the projection image onto the projection area until the projector has projected the projection image at all of its projection focus; obtaining the sharpness is maximum Projection focus corresponding to the projection screen, and the projection focus corresponding to the projection image with the highest resolution The best projection focus.
- the image resolution evaluation algorithm includes an image mean square error and a peak signal to noise ratio calculation algorithm or an image modulation transfer function calculation algorithm.
- the extracting the projected image according to the first environment image and the second environment image includes: subtracting pixels corresponding to the first environment image and the second environment image to obtain the projected image.
- the step of extracting a projected picture according to the first environment image and the second environment image includes: calculating according to a Fourier transform algorithm, a Walsh transform algorithm, or a discrete cosine transform
- the method converts the spatial regions of the first environment image and the second environment image into a transform domain, and extracts the projection image according to the first environment image and the second environment image.
- the method further comprises: causing the projector to be positioned at the optimal projection focus; and when the projector is located at the optimal projection focus, emitting an optimal projection indication signal.
- a projector automatic focusing system including a projector, an image collecting device, a processor, and a focusing device, the focusing device and the projector Projection lens connection for adjusting a projection focus of the projector, the image acquisition device, the projector and the focusing device are all connected to the processor;
- the processor is configured to: control the projector to project a projection to the projection area And controlling the image acquisition device to acquire a first environmental image including a projection area of the projector; controlling the projector to stop projecting a projection image to the projection area, and controlling the image acquisition device to include the a second environment image including a projection area of the projector; extracting a projection image according to the first environment image and the second environment image; calculating a sharpness of the projection image according to an image sharpness evaluation algorithm; recording the projection The projection focus at which the instrument is currently located, and establishing a correspondence between the sharpness of the projected picture and the projection focus Controlling the focusing device to adjust
- the image resolution evaluation algorithm includes an image mean square error and a peak signal to noise ratio calculation algorithm or an image modulation transfer function calculation algorithm.
- the processor is configured to provide, according to the first environment image and the second environment image
- the step of taking a projection picture includes: the processor is configured to: subtract the pixel points corresponding to the first environment image and the second environment image to obtain the projection picture, or the processor is configured to perform, according to a Fourier transform algorithm, The Walsh transform algorithm or the discrete cosine transform algorithm respectively converts the spatial regions of the first environment image and the second environment image into a transform domain, and then extracts the projection image according to the first environment image and the second environment image.
- the processor is further configured to control the focusing device to adjust a projection focus of the projector to an optimal focus, and control the projector to be positioned at the optimal projection focus;
- the autofocus system Also included is a pointing device coupled to the processor; the processor further configured to control the pointing device to emit an optimal projection indication when the projector is positioned at the optimal projection focus for projection signal.
- the indicating device is an indicator light; the indicating device sends an optimal projection indication signal to light the indicator light.
- the framing lens of the image capturing device is set as a CCD or CMOS camera lens.
- the present invention adjusts the projector to different projection focus, and separately collects the first environment image when the projector projects the projection picture, and stops the projection projection at the projector.
- a second environment image at the time of the screen obtaining a projection image corresponding to each projection focus according to the second environment image and the second environment image, and calculating the sharpness of each projection image, and the higher the definition of the projection image, the clearer the projection image is. Therefore, the projection focus corresponding to the projection image with the highest sharpness is extracted, and the projection focus is taken as the optimal projection focus; of course, the projector can be adjusted to the optimal projection focus for projection, and the projector is automatically focused.
- FIG. 1 is a schematic diagram of a system embodiment of the present invention for obtaining an optimal projection focus of a projector
- FIG. 2 is a flow chart of an embodiment of a method of obtaining an optimal projection focus of a projector of the present invention.
- a system 20 for obtaining an optimal projection focus of a projector includes a projector 21, an image capture device 22, a processor 23, and a focusing device 24, and the focusing device 24 is coupled to a projection lens of the projector 21 for The projection focus of the projector 21 is adjusted, and the image capture device 22, the projector 21, and the focus adjuster 24 are all connected to the processor 23.
- the focusing device 24 can also be integrated inside the projector 21 and integrated with the projector 21.
- the framing lens of the image pickup device 22 is provided with a CCD (Charge-coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor).
- the processor 23 sends a start projection signal to the projector 21 to cause the projector 21 to project a projection image to the projection area, and to transmit an image acquisition signal to the image acquisition device 22 to cause the image acquisition device 22 to capture the projection area including the projector 21.
- the first environmental image After acquiring the first environment image, the processor 23 sends a stop projection signal to the projector to stop the projector from projecting the projection image to the projection area, and sends the image collection signal to the image collection device.
- the number is such that the image capture device 22 captures a second environmental image that includes the projected area of the projector 21.
- the image acquisition signal is used to instruct the image acquisition device to perform a signal for acquiring an image, wherein after the image acquisition device acquires the first and second environment images, the first and second environment images are sent to the processor;
- the shooting conditions are the same, that is, the framing angle, the exposure time, the aperture size, the framing focus, and the like of the image capturing device 22 are the same, and the image capturing device 22 is the same The area was taken for shooting.
- the processor 23 extracts a projected picture based on the first environmental image and the second environmental image. Since the acquisition range of the environment image captured by the image acquisition device 22 includes the projection area, the second environment image includes the projection image, and the first environment image does not include the projection image, and the first environment image and the second environment image may be processed. , extract the projection picture. Specifically, the processor 23 obtains a projection picture according to subtracting pixel points corresponding to the first environment image and the second environment image. More specifically, the processor 23 divides the first environment image and the second environment image into a plurality of pixel points according to a preset matrix matrix division algorithm, and subtracts pixels corresponding to the first environment image and the second environment image.
- the manner of extracting the projected picture is not limited to the above method, for example, converting the spatial domain of the first environment image and the second environment image into a transform domain according to a Fourier transform algorithm, a Walsh transform algorithm, or a discrete cosine transform algorithm, respectively. And extracting the projection picture according to the first environment image and the second environment image. Extracting the projected image under the transform domain can reduce the amount of calculation and improve the processing efficiency.
- the processor 23 calculates the vote based on the image sharpness evaluation algorithm.
- the sharpness of the shadow picture, the projection focus at which the projector 21 is currently located is recorded, and the correspondence between the sharpness of the projected picture and the projection focus at which the projector 21 is currently located is established, and then the processor 23 sends the focus to the focusing device 24.
- the focus signal is adjusted so that the focusing device 24 adjusts the projection focus of the projector 21 and returns to the step of transmitting the start projection signal to the projector 21 until the projector 21 has projected the projected picture at all of its projection focuses.
- the processor 23 is further configured to acquire a projection focus corresponding to the projection image with the largest resolution, and to use the projection focus corresponding to the projection image with the largest resolution as the optimal projection focus.
- the sharpness of the projected picture may be different.
- the image sharpness evaluation algorithm includes an image mean square error and a peak signal to noise ratio calculation algorithm or an image modulation transfer function calculation algorithm.
- those skilled in the art may also use other algorithms to calculate the sharpness of the projected image. I will not repeat them one by one.
- the projection focus carried by the processor in each of the focus signals sent to the focusing device is different.
- the processor 23 can also control the focusing device 24 to adjust the projection focus of the projector 21 to the optimal focus so that the projector 21 is positioned at the optimal projection focus.
- the projection picture is also the clearest, thereby realizing the auto focus of the projector 21.
- the system further includes a pointing device 25 that is coupled to the processor 23.
- the processor 23 can control the pointing device 25 to issue a search for the best projection focus.
- the processor 23 can control the pointing device 25 to emit an optimal projection indication signal when the best projection focus has been found and the projector 21 is at the optimal projection focus for projection.
- the pointing device 25 is an indicator light, and when in the process of finding the optimal projection focus of the projector 21, the processor 23 is turned off, and when the projector 21 is at the optimal projection focus for projection, the indication The light is illuminated, or alternatively, when in the process of finding the optimal projection focus of the projector 21, the indicator light illuminates the first color, and when the projector 21 is at the optimal projection focus for projection, the indicator light illuminates the second color.
- the projector is adjusted to different projection focus, and the first environment image when the projector projects the projection image and the second environment image when the projector stops projecting the projection image are respectively acquired, according to the
- the second environment image and the second environment image obtain a projection picture corresponding to each projection focus, and calculate the sharpness of each projection picture, and the higher the definition of the projection picture, the clearer the projection picture, and therefore, the projection picture with the highest definition is extracted.
- the present invention further provides an embodiment of a method of automatic focusing of a projector.
- the projector's auto focus method includes:
- Step S301 causing the projector to project a projection image to the projection area, and acquiring a first environment image including a projection area of the projector;
- the projector When the second environment image is acquired, the projector is in a state of projecting the projected picture, and therefore, the first environment image includes the projected picture.
- Step S302 stopping the projector from projecting the projection image to the projection area, and collecting a second environment image including the projection area;
- the projector When the first environment image is acquired, the projector is in a state in which the projection screen is stopped, and therefore, the second environment image does not include the projection screen. It is worth noting that when the first environment image and the second environment image are acquired, the image capturing device is in the same shooting condition, that is, the angle of view, the exposure time, the aperture size, and the framing focus of the image capturing device are the same. And the image capture device captures the same area.
- Step S303 extracting a projection picture according to the first environment image and the second environment image
- the first environment image includes the projection picture
- the acquisition areas of the two acquired images are the same, the imaging conditions of the image collection device are the same, and therefore, the first environment image and the second environment image may be adopted.
- Extract the projected picture Specifically, in step S303, the pixel points corresponding to the first environment image and the second environment image are subtracted to obtain the projection picture.
- the manner of extracting the projected picture is not limited to the above method, for example, converting the spatial domain of the first environment image and the second environment image into a transform domain according to a Fourier transform algorithm, a Walsh transform algorithm, or a discrete cosine transform algorithm, respectively. And extracting the projection picture according to the first environment image and the second environment image. Extracting the projected image under the transform domain can reduce the amount of calculation and improve the processing efficiency.
- the projection curtain is usually placed in the projection area or the flat white wall is selected as the projection area, and therefore, the respective pixels of the projection area in the area within the first environment image are relatively close.
- the change of the second environment image compared with the first environment image is also in the region where the projection area is located. Therefore, by subtracting the pixel points corresponding to the first environment image from the second environment image, the area outside the projection area is The pixels are all zero, thereby extracting the projected picture. Of course, the subtracted projection picture can also be restored to avoid distortion.
- Step S304 Calculating the sharpness of the projected image according to the image sharpness evaluation algorithm
- the image sharpness evaluation algorithm includes an image sharpness evaluation algorithm including an image mean square error and a peak signal to noise ratio calculation algorithm or an image modulation transfer function calculation algorithm.
- image sharpness evaluation algorithm is not only the several algorithms listed above, but also in the field. The technician can select an appropriate image sharpness evaluation algorithm according to the actual situation.
- Step S305 recording the projection focus at which the projector is currently located, and establishing a correspondence between the sharpness of the projected image and the projection focus at which the projector is currently located;
- the definition of the projection picture is different.
- Step S306 adjusting the projection focus of the projector and returning to the step of projecting the projector until the projector has projected the projected image at all of its projection focus;
- the projector has a projection focus range and divides the projection focus range into several projection focal points.
- the projector has been projected on all of its projection focal points, which means that the projectors are projected by several projections and the corresponding projection images are acquired. .
- Step S307 acquiring a projection focus corresponding to the projection image with the largest resolution, and using the projection focus corresponding to the projection image with the largest resolution as the optimal projection focus;
- the projection focus of the projector is the same, but the resolution of the projected image is different when the projector is in different positions. Therefore, after the projector is replaced, it is necessary to re-find the optimal projection focus.
- the projector can also be automatically focused, and the method further includes:
- Step S308 Projecting the projector at the optimal projection focus.
- Step S309 when the projector is located at the optimal projection focus, an optimal projection indication signal is sent;
- the projector when the projector is in the process of finding the best projection focus, it can also send out the information to find the best projection focus, for example: when the projector is at the best projection focus, the control indicator lights up red, when the projector is looking for the most When the focus of the projection is in progress, the control indicator lights up in green, etc., so that the user can know the current state of the projector.
- the projector is adjusted to different projection focus, and the first environment image when the projector projects the projection image and the second environment image when the projector stops projecting the projection image are respectively acquired, according to the
- the second environment image and the second environment image obtain a projection picture corresponding to each projection focus, and calculate the sharpness of each projection picture, and the higher the definition of the projection picture, the clearer the projection picture, and therefore, the projection picture with the highest definition is extracted.
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Abstract
本发明公开了一种获取投影仪的最佳投影焦点的方法及系统，方法包括使投影仪向投影区域投射投影画面，并且采集包含投影仪的投影区域在内的第一环境图像；使投影仪停止向投影区域投射投影画面，并且采集包含投影区域在内的第二环境图像；根据第一环境图像和第二环境图像，提取投影画面；计算投影画面的清晰度；记录投影仪的投影焦点，并建立投影画面的清晰度与投影焦点之间的对应关系；调节投影仪的投影焦点，并返回使投影仪进行投影的步骤，直至投影仪在其所有投影焦点都进行过投影；获取清晰度为最大的投影画面对应的投影焦点，并将清晰度为最大的投影画面对应的投影焦点作为最佳投影焦点。通过上述方式，本发明能够获取投影仪的最佳投影焦点。
Description
本发明涉及投影技术领域，特别是涉及一种获取投影仪的最佳投影焦点的方法及系统。
投影仪，又称投影机，是一种可以将图像或视频投射到幕布上的设备，其广泛应用于家庭、办公室、学校和娱乐场所等场所。其中，投影仪也可以通过不同的接口与计算机、VCD、DVD、BD、游戏机、DV等设备相连,接收不同设备的视频信号，对视频输入端的设备限制较小。
根据工作方式不同，投影仪分为CRT投影仪、LCD投影仪、DLP投影仪等。但是，由于投影仪是通过投影镜头投射图像或视频，因此，投影镜头的投影焦点不同时，或者，投影仪的位置产生变化时，投影仪所投射的图像或视频的清晰度会产生变化。为了获得最佳投射图像或视频，现有技术中大多数都是通过一边手动调节投影镜头的投影焦点，一边观看投影画面，寻找最佳投射图像或视频，手动调节投影镜头的投影焦点的方式，非常不方便。
发明内容
本发明主要解决的技术问题是提供一种获取投影仪的最佳投影焦点的方法及系统，能够方便获取投影仪的最佳投影焦点。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种投影仪自动聚焦的方法，包括：使所述投影仪向投影区域投射投影画面，并且采集包含所述投影仪的投影区域在内的第一环境图像；启使所述投影仪停止向投影区域投射投影画面，并且采集包含所述投影区域在内的第二环境图像；根据所述第一环境图像和第二环境图像，提取投影画面；根据图像清晰度评价算法，计算所述投影画面的清晰度；记录所述投影仪当前所处的投影焦点，并建立所述投影画面的清晰度与所述投影焦点之间的对应关系；调节所述投影仪的投影焦点，并返回使所述投影仪向投影区域投射投影画面的步骤，直至所述投影仪在其所有投影焦点都进行过投射投影画面；获取所述清晰度为最大的投影画面对应的投影焦点，并将所述清晰度为最大的投影画面对应的投影焦点作为最佳投影焦点。
其中，所述图像清晰度评价算法包括图像均方误差及峰值信噪比计算算法或者图像调制传递函数计算算法。
其中，所述根据所述第一环境图像和第二环境图像，提取投影画面步骤包括：使所述第一环境图像和第二环境图像对应的像素点进行相减，获得到所述投影画面。
其中，所述根据所述第一环境图像和第二环境图像，提取投影画面步骤包括：根据傅立叶变换算法、沃尔什变换算法或者离散余弦变换算
法分别将所述第一环境图像和第二环境图像的空间域的转换为变换域，再根据所述第一环境图像和第二环境图像提取投影画面。
其中，所述方法还包括：使所述投影仪位于所述最佳投影焦点进行投影；当所述投影仪位于所述最佳投影焦点时，发出最佳投影指示信号。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种投影仪自动聚焦系统，包括投影仪、图像采集装置、处理器和调焦装置，所述调焦装置与所述投影仪的投影镜头连接，用于调整所述投影仪的投影焦点，所述图像采集装置、投影仪和调焦装置均与处理器连接；所述处理器用于：控制所述投影仪向投影区域投射投影画面，并且控制所述图像采集装置采集包含所述投影仪的投影区域在内的第一环境图像；控制所述投影仪停止向投影区域投射投影画面，并且控制所述图像采集装置采集包含所述投影仪的投影区域在内的第二环境图像；根据所述第一环境图像和第二环境图像，提取投影画面；根据图像清晰度评价算法，计算所述投影画面的清晰度；记录所述投影仪当前所处的投影焦点，并建立所述投影画面的清晰度与所述投影焦点之间的对应关系；控制所述调焦装置调节所述投影仪的投影焦点，并返回控制所述投影仪向投影区域投射投影画面的步骤，直至所述投影仪在其所有投影焦点都进行过投射投影画面；获取所述清晰度为最大的投影画面对应的投影焦点，并将所述清晰度为最大的投影画面对应的投影焦点作为最佳投影焦点。
其中，所述图像清晰度评价算法包括图像均方误差及峰值信噪比计算算法或者图像调制传递函数计算算法。
其中，所述处理器用于根据所述第一环境图像和第二环境图像，提
取投影画面步骤包括：所述处理器用于：使所述第一环境图像和第二环境图像对应的像素点进行相减，获得所述投影画面，或者，所述处理器用于根据傅立叶变换算法、沃尔什变换算法或者离散余弦变换算法分别将所述第一环境图像和第二环境图像的空间域的转换为变换域，再根据所述第一环境图像和第二环境图像提取投影画面。
其中，所述处理器还用于控制所述调焦装置将所述投影仪的投影焦点调整至最佳焦点，并控制所述投影仪位于所述最佳投影焦点进行投影；所述自动聚焦系统还包括指示装置，所述指示装置与所述处理器连接；所述处理器还用于在使所述投影仪位于所述最佳投影焦点进行投影时，控制所述指示装置发出最佳投影指示信号。
其中，所述指示装置为指示灯；所述指示装置发出最佳投影指示信号为所述指示灯亮起。
其中，所述图像采集装置的取景镜头设置为CCD或CMOS摄像镜头。
本发明的有益效果是：区别于现有技术的情况，本发明将投影仪调节至不同的投影焦点，并分别采集在投影仪投射投影画面时的第一环境图像，以及在投影仪停止投射投影画面时的第二环境图像，根据第二环境图像和第二环境图像获得各投影焦点对应的投影画面，计算各投影画面的清晰度，而投影画面的清晰度越高，投影画面就越清楚，因此，提取将清晰度最大的投影画面对应的投影焦点，并作该投影焦点作为最佳投影焦点；当然，还可以将投影仪调节至最佳投影焦点进行投影，实现投影仪的自动聚焦。
图1是本发明获取投影仪的最佳投影焦点的系统实施方式的示意图；
图2是本发明获取投影仪的最佳投影焦点的方法实施方式的流程图。
下面结合附图和实施方式对本发明进行详细说明。
请参阅图1，获取投影仪的最佳投影焦点的系统20包括投影仪21、图像采集装置22、处理器23和调焦装置24，调焦装置24与投影仪21的投影镜头连接，用于调整投影仪21的投影焦点，图像采集装置22、投影仪21和调焦装置24均与处理器23连接。当然，调焦装置24也可以集成在投影仪21的内部，与投影仪21成为一体。在本实施方式中，图像采集装置22的取景镜头设置有CCD(Charge-coupled Device，电荷耦合元件)或者CMOS(Complementary Metal Oxide Semiconductor，互补金属氧化物半导体)。
处理器23向投影仪21发送启动投影信号，以使投影仪21向投影区域投射投影画面，向图像采集装置22发送图像采集信号，以使图像采集装置22采集包含投影仪21的投影区域在内的第一环境图像。在采集到第一环境图像后，处理器23向投影仪发送停止投射信号，以使投影仪停止向投影区域投射投影画面，并向图像采集装置发送图像采集信
号，以使图像采集装置22采集包含投影仪21的投影区域在内的第二环境图像。图像采集信号用于指示图像采集装置进行采集图像的信号，其中，图像采集装置采集到第一、第二环境图像后，会把第一、第二环境图像发送至处理器；另外，图像采集装置22在采集第一环境图像和第二环境图像时，其拍摄条件相同，即：图像采集装置22的取景角度、曝光时间、光圈大小和取景焦点等等均相同，并且图像采集装置22是对同一区域进行拍摄得到的。
处理器23根据第一环境图像和第二环境图像，提取投影画面。由于图像采集装置22采集环境图像的采集范围包含投影区域，因此，第二环境图像包含投影画面，而第一环境图像没有包含投影画面，则可以通过对第一环境图像和第二环境图像进行处理，提取出投影画面。具体的，处理器23根据使第一环境图像和第二环境图像对应的像素点进行相减，获得投影画面。更具体的，处理器23根据预设行列矩阵划分算法，将第一环境图像和第二环境图像分别划分为多个像素点，使第一环境图像和第二环境图像对应的像素点进行相减，获得到投影画面的像素点，根据预设行列矩阵划分算法，将投影画面的各个像素点组合形成完整的投影画面。当然，提取投影画面的方式也不仅仅限于上述方法，例如：根据傅立叶变换算法、沃尔什变换算法或者离散余弦变换算法分别将第一环境图像和第二环境图像的空间域的转换为变换域，再根据第一环境图像和第二环境图像提取投影画面。在变换域下提取投影画面，可以减少计算量，提高处理效率。
在获得投影画面后，处理器23根据图像清晰度评价算法，计算投
影画面的清晰度,记录投影仪21当前所处的投影焦点，并建立投影画面的清晰度与投影仪21当前所处的投影焦点之间的对应关系，然后处理器23向调焦装置24发送调焦信号，以使调焦装置24调节投影仪21的投影焦点，并返回向投影仪21发送启动投射信号的步骤，直至投影仪21在其所有投影焦点都进行过投射投影画面。处理器23还用于获取清晰度为最大的投影画面对应的投影焦点，并将清晰度为最大的投影画面对应的投影焦点作为最佳投影焦点。
当投影仪21位于不同投影焦点时，其投影画面的清晰度可能不相同，通过将投影仪21调节至在各个投影焦点，并获取其各个投影画面的清晰度以及投影焦点，而清晰度越大其对应的投影画面越清晰，因此，清晰度最大的投影画面对应的投影焦点为最佳焦点。在本实施方式中，图像清晰度评价算法包括图像均方误差及峰值信噪比计算算法或者图像调制传递函数计算算法，当然，本领域技术人员也可以采用其它算法计算投影画面的清晰度，此处不再一一赘述。另外，需要说明的是：处理器每次向调焦装置所发送的调焦信号中所携带的投影焦点均不相同。
进一步的，在获取到最佳投影焦点后，处理器23还可以控制调焦装置24将投影仪21的投影焦点调整至最佳焦点，以使投影仪21位于最佳投影焦点进行投影。而投影仪21在最佳投影焦点进行投影时，其投影画面也最清晰，从而实现了投影仪21的自动聚焦。
为了方便用户获知投影仪21的调整状态，系统还包括指示装置25，指示装置25与处理器23连接。当处于寻找投影仪21的最佳投影焦点的过程中时，处理器23可以控制指示装置25发出寻找最佳投影焦点信
息，当最佳投影焦点已找到，并且投影仪21处于最佳投影焦点进行投影时，处理器23可以控制指示装置25发出最佳投影指示信号。在本实施方式中，指示装置25为指示灯，当处于寻找投影仪21的最佳投影焦点的过程中时，处理器23指示灯熄灭，当投影仪21处于最佳投影焦点进行投影时，指示灯亮起，又或者，当处于寻找投影仪21的最佳投影焦点的过程中时，指示灯亮起第一颜色，当投影仪21处于最佳投影焦点进行投影时，指示灯亮起第二颜色。
在本发明实施方式中，将投影仪调节至不同的投影焦点，并分别采集在投影仪投射投影画面时的第一环境图像，以及在投影仪停止投射投影画面时的第二环境图像，根据第二环境图像和第二环境图像获得各投影焦点对应的投影画面，计算各投影画面的清晰度，而投影画面的清晰度越高，投影画面就越清楚，因此，提取将清晰度最大的投影画面对应的投影焦点，并作该投影焦点作为最佳投影焦点；当然，还可以将投影仪调节至最佳投影焦点进行投影，实现投影仪的自动聚焦。
本发明又提供投影仪自动聚焦的方法实施方式。请参阅图2，投影仪自动聚焦的方法包括：
步骤S301：使投影仪向投影区域投射投影画面，并且采集包含投影仪的投影区域在内的第一环境图像；
在采集第二环境图像时，投影仪处于投射投影画面的状态，因此，第一环境图像包含投影画面。
步骤S302：使投影仪停止向投影区域投射投影画面，并且采集包含所述投影区域在内的第二环境图像；
在采集第一环境图像时，投影仪处于停止投射投影画面的状态，因此，第二环境图像并没有包含投影画面。值得说明的是：在采集第一环境图像和第二环境图像时，其图像采集装置所处拍摄条件相同，即：图像采集装置的取景角度、曝光时间、光圈大小和取景焦点等等均相同，并且图像采集装置是对同一区域进行拍摄。
步骤S303：根据第一环境图像和第二环境图像，提取投影画面；
由于第二环境图像没有包含投影画面，第一环境图像包含投影画面，并且两者采集图像的采集区域相同，图像采集装置的拍摄条件相同，因此，可以通过第一环境图像和第二环境图像，提取投影画面。具体的，步骤S303为：使第一环境图像和第二环境图像对应的像素点进行相减，获得所述投影画面。当然，提取投影画面的方式也不仅仅限于上述方法，例如：根据傅立叶变换算法、沃尔什变换算法或者离散余弦变换算法分别将第一环境图像和第二环境图像的空间域的转换为变换域，再根据第一环境图像和第二环境图像提取投影画面。在变换域下提取投影画面，可以减少计算量，提高处理效率。
为了投影仪进行投影，通常投影区域放置投影帘幕或者选择平整洁白的墙体作为投影区域，因此，投影区域在第一环境图像内的区域的各个像素点均比较接近。另外，第二环境图像与第一环境图像相比，其变化也是在投影区域所在区域，因此，通过，第二环境图像与第一环境图像对应的像素点相减，则投影区域以外的区域的像素点全部为零，从而提取投影画面。当然，也可以相减出来的投影画面进行还原，以避免其失真。
步骤S304：根据图像清晰度评价算法，计算投影画面的清晰度；
图像清晰度评价算法包括图像清晰度评价算法包括图像均方误差及峰值信噪比计算算法或者图像调制传递函数计算算法，当然，图像清晰度评价算法也不仅于上述列举的几种算法，本领域技术人员可以根据实际情况选择合适的图像清晰度评价算法。
步骤S305：记录投影仪当前所处的投影焦点，并建立投影画面的清晰度与投影仪当前所处的投影焦点之间的对应关系；
投影仪位于不同投影焦点时，其投影画面的清晰度是不相同，通过建立清晰度与投影焦点之间的对应关系，方便后续进行判断。
步骤S306：调节投影仪的投影焦点，并返回使投影仪进行投影的步骤，直至投影仪在其所有投影焦点都进行过投射投影画面；
投影仪通过具有投影焦点范围，将投影焦点范围划分出若干个投影焦点，投影仪在其所有投影焦点都进行过投影是指投影仪上述若干个投影焦点都进行投影，并且获取其对应的投影画面。
步骤S307：获取清晰度为最大的投影画面对应的投影焦点，并将清晰度为最大的投影画面对应的投影焦点作为最佳投影焦点；
清晰度越大说明投影画面越清楚，而清晰度最大的投影画面对应的投影焦点为最佳投影焦点。值得说明的是：投影仪的投影焦点相同，但是投影仪位于不同位置时，其投影画面的清晰度也是不相同的，因此，在投影仪更换位置后，需要重新查找其最佳投影焦点。
进一步的，在获得最佳投影焦点后，还可以使投影仪进行自动聚焦，则方法还包括：
步骤S308：使投影仪位于最佳投影焦点进行投影。
投影仪位于最佳投影焦点进行投影时，其当前的投影画面是越清晰。
步骤S309：当投影仪位于最佳投影焦点时，发出最佳投影指示信号；
当然，当投影仪处于寻找最佳投影焦点的过程中时，也可以发出寻找最佳投影焦点信息，例如：当投影仪位于最佳投影焦点时，控制指示灯亮起红色，当投影仪处于寻找最佳投影焦点的过程中时，控制指示灯亮起绿色等等，以方便用户获知投影仪当前所处的状态。
在本发明实施方式中，将投影仪调节至不同的投影焦点，并分别采集在投影仪投射投影画面时的第一环境图像，以及在投影仪停止投射投影画面时的第二环境图像，根据第二环境图像和第二环境图像获得各投影焦点对应的投影画面，计算各投影画面的清晰度，而投影画面的清晰度越高，投影画面就越清楚，因此，提取将清晰度最大的投影画面对应的投影焦点，并作该投影焦点作为最佳投影焦点；当然，还可以将投影仪调节至最佳投影焦点进行投影，实现投影仪的自动聚焦。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。
Claims (10)
- 一种获取投影仪的最佳投影焦点的方法，其特征在于，包括：使所述投影仪向投影区域投射投影画面，并且采集包含所述投影仪的投影区域在内的第一环境图像；使所述投影仪停止向投影区域投射投影画面，并且采集包含所述投影区域在内的第二环境图像；根据所述第一环境图像和第二环境图像，提取所述投影画面；根据图像清晰度评价算法，计算所述投影画面的清晰度；记录所述投影仪当前所处的投影焦点，并建立所述投影画面的清晰度与所述投影焦点之间的对应关系；调节所述投影仪的投影焦点，并返回使所述投影仪向投影区域投射投影画面的步骤，直至所述投影仪在其所有投影焦点都进行过投射投影画面；获取所述清晰度为最大的投影画面对应的投影焦点，并将所述清晰度为最大的投影画面对应的投影焦点作为最佳投影焦点。
- 根据权利要求1所述的方法，其特征在于，所述图像清晰度评价算法包括图像均方误差及峰值信噪比计算算法或者图像调制传递函数计算算法。
- 根据权利要求1所述的方法，其特征在于，所述根据所述第一环境图像和第二环境图像，提取投影画面步骤包 括：使所述第一环境图像和第二环境图像对应的像素点进行相减，获得到所述投影画面。
- 根据权利要求1所述的方法，其特征在于，所述根据所述第一环境图像和第二环境图像，提取投影画面步骤包括：根据傅立叶变换算法、沃尔什变换算法或者离散余弦变换算法分别将所述第一环境图像和第二环境图像的空间域的转换为变换域，再根据所述第一环境图像和第二环境图像提取投影画面。
- 根据权利要求1所述的方法，其特征在于，所述方法还包括：使所述投影仪位于所述最佳投影焦点进行投影；当所述投影仪位于所述最佳投影焦点时，发出最佳投影指示信号。
- 一种获取投影仪的最佳投影焦点的系统，其特征在于，包括投影仪、图像采集装置、处理器和调焦装置，所述调焦装置与所述投影仪的投影镜头连接，用于调整所述投影仪的投影焦点，所述图像采集装置、投影仪和调焦装置均与处理器连接；所述处理器用于：向所述投影仪发送启动投射信号，以使所述投影仪向投影区域投射投影画面，向所述图像采集装置发送图像采集信号，以使所述图像采集装置采集包含所述投影仪的投影区域在内的第一环境图像；向所述投影仪发送停止投射信号，以使所述投影仪停止向投影区域投射投影画面，向所述图像采集装置发送图像采集信号，控制所述图像采集装置采集包含所述投影仪的投影区域在内的第二环境图像；根据所述第一环境图像和第二环境图像，提取投影画面；根据图像清晰度评价算法，计算所述投影画面的清晰度；记录所述投影仪当前所处的投影焦点，并建立所述投影画面的清晰度与所述投影焦点之间的对应关系；向所述调焦装置发送调焦信号，以所述调焦装置调节所述投影仪的投影焦点，并返回向所述投影仪发送启动投射信号的步骤，直至所述投影仪在其所有投影焦点都进行过投射投影画面；获取所述清晰度为最大的投影画面对应的投影焦点，并将所述清晰度为最大的投影画面对应的投影焦点作为最佳投影焦点。
- 根据权利要求5所述的系统，其特征在于，所述图像清晰度评价算法包括图像均方误差及峰值信噪比计算算法或者图像调制传递函数计算算法。
- 根据权利要求5所述的系统，其特征在于，所述处理器用于根据所述第一环境图像和第二环境图像，提取投影画面步骤包括：使所述第一环境图像和第二环境图像对应的像素点进行相减，获得所述投影画面；或者，所述处理器用于根据傅立叶变换算法、沃尔什变换算法或者离散余弦变换算法分别将所述第一环境图像和第二环境图像的空间域的转换为变换域，再根据所述第一环境图像和第二环境图像提取投影画面。
- 根据权利要求5所述的系统，其特征在于，所述处理器还用于控制所述调焦装置将所述投影仪的投影焦点调 整至最佳焦点，并控制所述投影仪位于所述最佳投影焦点进行投影；所述系统还包括指示装置，所述指示装置与所述处理器连接；所述处理器还用于在使所述投影仪位于所述最佳投影焦点进行投影时，控制所述指示装置发出最佳投影指示信号。
- 根据权利要求5所述的系统，其特征在于，所述图像采集装置的取景镜头设置为CCD或CMOS摄像镜头。
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| CN115174877A (zh) * | 2021-11-16 | 2022-10-11 | 海信视像科技股份有限公司 | 投影设备及投影设备的调焦方法 |
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| CN105208308B (zh) * | 2015-09-25 | 2018-09-04 | 广景视睿科技（深圳）有限公司 | 一种获取投影仪的最佳投影焦点的方法及系统 |
| CN106303481B (zh) * | 2016-09-09 | 2019-03-19 | 深圳市Tcl高新技术开发有限公司 | 一种投影电视对焦的方法及系统 |
| CN108206944A (zh) * | 2016-12-20 | 2018-06-26 | 浙江舜宇智能光学技术有限公司 | 评价发散光式散斑投射器的投影清晰度的方法和系统 |
| CN106604005B (zh) * | 2016-12-20 | 2019-09-10 | 深圳市Tcl高新技术开发有限公司 | 一种投影电视自动对焦方法及系统 |
| CN109120918B (zh) * | 2018-08-14 | 2020-09-22 | 上海常仁信息科技有限公司 | 基于机器人的投影效果自评系统和方法 |
| CN109698948B (zh) | 2019-01-31 | 2021-04-23 | 广景视睿科技（深圳）有限公司 | 投影方法及投影设备 |
| CN116647654B (zh) * | 2022-04-08 | 2024-02-23 | 宜宾市极米光电有限公司 | 投影仪热失焦的补偿方法、系统、设备及可读存储介质 |
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