WO2023116393A1 - 投影装置的对焦方法及投影装置 - Google Patents

投影装置的对焦方法及投影装置 Download PDF

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Publication number
WO2023116393A1
WO2023116393A1 PCT/CN2022/136251 CN2022136251W WO2023116393A1 WO 2023116393 A1 WO2023116393 A1 WO 2023116393A1 CN 2022136251 W CN2022136251 W CN 2022136251W WO 2023116393 A1 WO2023116393 A1 WO 2023116393A1
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WIPO (PCT)
Prior art keywords
light spot
light
illuminating
lens
projection
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Ceased
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PCT/CN2022/136251
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English (en)
French (fr)
Inventor
赵鹏
弓殷强
陈彦哲
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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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
    • G03B21/14—Details
    • G03B21/142—Adjusting of projection optics
    • 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
    • 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
    • G03B21/14—Details
    • 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]

Definitions

  • the present application belongs to the field of projection technology, and in particular relates to a focusing method of a projection device and the projection device.
  • Projection video products may be used in various occasions such as mobile business presentations, multimedia conference rooms, classrooms, auditoriums, squares, etc.
  • the lens In the projection system, only when the lens is focused accurately can a clear and sharp picture be produced on the projection surface, but most of the current projectors still use the traditional contrast focusing method.
  • the contrast of the picture By moving the focusing lens, the contrast of the picture is measured, and the maximum contrast In this process, the lens needs to move within a large stroke and measure the contrast continuously. The speed is relatively slow, and there is still a lot of room for improvement.
  • the present application provides a focusing method for a projection device, a projection device and a focusing system, which can improve the focusing efficiency of the projection device.
  • the present application provides a focusing method of a projection device, including: projecting a first illuminating beam and a second illuminating beam to the lens, and the first illuminating beam and the second illuminating beam are emitted from the same position of the spatial light modulator and have different incident angles; the first illumination beam passes through the lens and is projected on the projection surface to form a first light spot, and the second illumination beam passes through the lens and is projected on the projection surface to form a second light spot; based on the first light spot and the second light spot in Based on the relative positional relationship on the projection surface, the focus adjustment amount of the lens is calculated; the lens is adjusted based on the focus adjustment amount.
  • the first illuminating light beam and the second illuminating light beam have the same color, and the projecting time of the first illuminating light beam and the second illuminating light beam on the projection surface are different.
  • the colors of the first illuminating beam and the second illuminating beam are different, and the first illuminating beam and the second illuminating beam are projected onto the projection surface at the same time.
  • the image information of the first light spot and the image information of the second light spot are captured by the camera, and the relative positional relationship between the first light spot and the second light spot on the projection surface is calculated based on the image information of the first light spot and the image information of the second light spot.
  • the relative positional relationship between the first light spot and the second light spot on the projection surface is calculated based on the image information of the first light spot and the second light spot, including:
  • the present application further provides a projection device, including a controller, a light source and a lens, the light source is used to generate a first illumination beam and a second illumination beam, and the first illumination beam and the second illumination beam are modulated from spatial light
  • the controller is used to calculate the relative position of the first light spot and the second light spot on the projection surface.
  • Focus Amount to focus the lens by the lens-based focus amount.
  • the first illuminating light beam and the second illuminating light beam have the same color, and the projecting time of the first illuminating light beam and the second illuminating light beam on the projection surface are different.
  • the first illuminating light beam and the second illuminating light beam have different colors, and the first illuminating light beam and the second illuminating light beam are simultaneously projected onto the projection surface.
  • the projection device further includes a camera, and the camera is used to capture the image information of the first light spot and the second light spot, and the controller obtains the relative position of the first light spot and the second light spot on the projection surface according to the image information of the first light spot and the second light spot. Location.
  • the controller is further used to control the camera to calculate the equivalent central point of the first light spot and the second light spot based on the image information of the first light spot and the second light spot through the brightness weighted average method, so as to The equivalent central point calculates the relative positional relationship between the first light spot and the second light spot.
  • the beneficial effects of the present application are: different from the focusing method of the projection device in the prior art, the present application can quickly calculate the adjustment direction of the lens by forming at least two light spots on the projection surface and calculating the relative positional relationship of the at least two light spots Compared with the technical solution in the prior art that needs to repeatedly move the lens within a larger stroke and continuously measure the contrast to achieve projection focusing, this application can reduce the number of measurements and realize the focus of the lens by adjusting the lens in sequence , can greatly shorten the time course for the projection device to adjust the lens to achieve focusing, and improve the focusing efficiency of the projection device; at the same time, the application can reduce the difficulty of focusing the projection device and reduce the movement loss of the lens by reducing the number of adjustments of the lens in the projection device.
  • Fig. 1 is a structural schematic diagram of a projection system
  • Fig. 2 is a schematic flow chart of the focusing method of the projection device of the present application.
  • FIG. 3 is a working schematic diagram of the first embodiment of the focusing method of the projection device of the present application.
  • Fig. 4 is a working schematic diagram of the second embodiment of the focusing method of the projection device of the present application.
  • FIG. 5 is a working schematic diagram of the third embodiment of the focusing method of the projection device of the present application.
  • FIG. 6 is a schematic structural diagram of an embodiment of a projection device of the present application.
  • the inventor of the present application has found through long-term research that before the projection device has ideal focus, the clear and sharp picture that should be presented when the focus is successful will appear blurred, and the direction and size of the blur are related to the angular distribution of the illuminating light, the direction of defocus and degree.
  • the camera system also needs fast and good focusing. The easiest way is contrast peak focusing.
  • technologies such as laser ranging focusing and phase focusing have emerged, achieving a faster focusing experience.
  • This technology is widely used in the lenses of SLR cameras, smartphones, etc.
  • the inventor of the present application introduces the idea of camera focusing into the projection device to realize the focusing of the projection device.
  • FIG. 1 is a schematic structural diagram of a projection system.
  • the projection system 10 includes a projection device 120 and a projection surface 110 , wherein the projection device 120 includes a light source 121 , a spatial light modulator 122 and a lens 123 .
  • the light beam generated by the light source 121 has a certain diffusion angle, which can be divided into upper and lower parts.
  • the spatial light modulator 122 is a key device in modern optical fields such as real-time optical information processing, adaptive optics and optical computing, and can be a liquid crystal light valve.
  • the light source 121 can form a light spot on the projection surface 110 , thereby displaying a clear and sharp image. In the case of not achieving focus, as shown in FIG.
  • the light source 121 since the light beam has a certain divergence angle, the light source 121 forms two diffused upper and lower light spots on the projection surface 110, the first light spot 126 and the second light spot 127, thereby causing The picture formed on the projection surface 110 is blurred.
  • the position where the light beam generated by the light source before focusing can be focused into a spot is defined as the preset projection surface.
  • the vertical position relationship between the first light spot 126 and the second light spot 127 and the distance between them are related to the distance between the projection surface 110 and the preset projection surface 111 . If the distance between the projection surface 110 and the preset projection surface 111 can be calculated, the direction and distance of the lens 123 to achieve focusing can also be determined, and then the direction and distance of the lens 123 can be adjusted to achieve focusing.
  • the present application provides a focusing method of a projection device, please refer to Figure 2 and Figure 3,
  • Figure 2 is a schematic flow chart of the focusing method of the projection device of the present application
  • Figure 3 is the first focusing method of the projection device of the present application
  • FIGS. 2 and 3 in the projection system 20 of the present application, the focusing method of the projection device 220 specifically includes the following steps:
  • the illuminating beams projected to the lens 223 can be two groups, respectively the first illuminating beams and the second illuminating beams, the first illuminating beams and the second illuminating beams are emitted from the same position of the spatial light modulator 222 and have different
  • the incident angles may also be two or more groups having different incident angles and emitting from the same position of the spatial light modulator 222 .
  • each group of illuminating light beams may be generated by a group of illuminating light sources, and in some specific application scenarios, each group of illuminating light beams may also be generated by multiple groups of illuminating light sources, which is not limited here.
  • the light source 221 in the projection device 220 may include at least two groups of lighting sources, namely the first group of lighting sources 2211 and the second group of lighting sources 2212, for generating the first lighting beam with a second illumination beam.
  • the first illumination beam and the second illumination beam are emitted from the same position of the spatial light modulator 222 , which can be understood as not being the same position in an absolute sense.
  • the first illuminating light beam and the second illuminating light beam emit at two positions on the spatial light modulator 222 with very small differences that cannot be observed by the naked eye.
  • the technical solution of the present application can be realized, and no limitation is made here.
  • the first illumination beam passes through the lens 223 and is projected on the projection surface 210 to form a first light spot 226
  • the second illumination beam passes through the lens 223 and is projected on the projection surface 210 to form a second light spot 227 .
  • the first illumination beam and the second illumination beam emitted to the lens 223 are emitted from the same position of the spatial light adjuster 222 and have different incident angles, and then the first illumination beam and the second illumination beam pass through the lens 223 and are projected on the
  • the corresponding first light spot 226 and second light spot 227 will be formed on the projection surface 210, the first light spot 226 and the second light spot 227 will not completely overlap, specifically, they can be partially overlapped, or not overlapped at all, which is not described here. limit.
  • the relative positional relationship of at least two light spots on the projection surface 210 is related to the direction and distance that the lens 223 needs to adjust for focusing, and the relative positional relationship between the first light spot 226 and the second light spot 227 on the projection surface 210 can be calculated to obtain The amount of focus adjustment required by the lens 223.
  • the relative positional relationship between the first light spot 226 and the second light spot 227 on the projection surface is calculated.
  • the following steps may be used to calculate the relative positional relationship between the first light spot 226 and the second light spot 227 on the projection surface 210 based on the image information of the first light spot 226 and the second light spot 227 .
  • Step 1 Calculate the equivalent central points of the first light spot 226 and the second light spot 227 based on the brightness of the first light spot 226 and the second light spot 227 using a weighted average method.
  • the center point of the light spot can be calculated based on the brightness of each light spot using a weighted average method, and the relative positional relationship of the light spot can be calculated through the center point of the light spot, which can improve the accuracy of the relative positional relationship calculation. In other embodiments, it can be improved Any calculation method for the calculation accuracy of the relative positional relationship can be applied, which is not limited here.
  • Step 2 Calculate the relative positional relationship between the first light spot 226 and the second light spot 227 based on the equivalent center point of the first light spot 226 and the equivalent center point of the second light spot 227 .
  • the following steps may be used to calculate and obtain the focusing amount of the lens 223 .
  • Step 3 Calculate the deviation data between the preset focusing point and the actual imaging light spot based on the relative position data.
  • the focus point after focusing in the actual projection process is defined as the preset focus point
  • the light spot of the light source 221 on the projection surface 210 before focusing in the actual projection process is defined as the actual imaging light spot.
  • the actual imaging spot formed by the light source 221 on the projection surface 210 cannot be focused, and its position is related to the deviation data of the preset focusing point and the focusing amount required by the lens 223 to focus.
  • the relative positional relationship between the first light spot 226 and the second light spot 227 is different from the correspondence between the deviation data between the preset focus point and the actual imaging light spot.
  • the relevant technicians can measure the above corresponding relationship and make a corresponding lookup table, so that the focusing process of the projection device can quickly calculate the preset focus point when the projection device is in use. The deviation data from the actual spot.
  • Step 4 Calculate the adjustment direction and adjustment distance of the lens based on the deviation data between the preset focus point and the actual focus point.
  • the projection device 220 can be set to include a spatial light modulator 222 and a lens 223, and the spatial light modulator 222 and the lens 223 can be obtained by calculating the deviation data between the preset focus point and the actual focus point The positional relationship between them, and then obtain the specific focusing amount required by the lens 223, that is, the specific adjustment direction and adjustment distance of the lens 223.
  • the relative positional relationship between the lens 223 and the spatial light modulator 222 can be adjusted, so that different illuminating beams can be focused on the projection surface 210, and different projection angles can be achieved.
  • Different illuminating light beams can form a light spot on the projection surface 210, presenting a clear and sharp picture, and then realize the focusing of the lens 223 in the projection device 220 by only one operation of adjusting the lens, which can greatly improve the performance of the projection device 220. focus efficiency.
  • the configurations of the spatial light modulator 222 and the lens 223 in the projection surface 210 and the projection device 220 may be the same as those in the above embodiment, and will not be repeated here.
  • the illumination light source 221 of the projection device 220 includes a first group of illumination light sources 2211 and a second group of illumination light sources 2212 .
  • the illumination light source 221 projects two sets of illumination light beams onto the projection surface 210 to form corresponding first light spots 226 and second light spots 227 on the projection surface 210 .
  • step S10 may include the following process:
  • S11 Control the operation of the first group of illumination light sources 2211 to project a corresponding first group of illumination light beams onto the projection surface 210 to form corresponding first light spots 226 on the projection surface 210 .
  • S12 Control the operation of the second group of illumination light sources 2212 to project a corresponding second group of illumination light beams onto the projection surface 210 to form corresponding second light spots 227 on the projection surface 210 .
  • the colors of the first group of illumination beams generated by the first group of illumination sources 2211 and the second group of illumination beams generated by the second group of illumination sources 2212 can be set to be red, orange, yellow, Any of green, blue, purple, white.
  • the colors of the illumination light beams generated by the first group of illumination light sources 2211 and the second group of illumination light sources 2212 may be set to be different, so that the colors of the first group of illumination light beams are different from those of the second group of illumination light beams.
  • the first group of illumination sources 2211 and the second group of illumination sources 2212 can be controlled to work simultaneously to form the first light spot 226 and the second light spot 227 with different colors on the projection surface 210 .
  • the first group of illumination light sources 2211 and the second group of illumination sources 2212 can also be controlled to work in time sequence, and form the first light spot 226 and the second light spot 227 with different colors on the projection surface 210 .
  • the projection angles of the illumination light beams generated by the first group of illumination sources 2211 and the second group of illumination sources 2212 towards the projection surface 210 have certain differences, so as to realize the difference between the first light spot 226 and the second light spot 227.
  • the positions do not completely overlap, and can be partially overlapped or completely separated.
  • the relative position relationship between the first light spot 226 and the second light spot 227 is related to the relative position relationship between the first group of illumination light sources 2211 and the second group of illumination light sources 2212 .
  • the first light spot 226 and the second light spot 227 are also distributed up and down along the extending direction of the projection surface 210 Relative positional relationship; in an application scenario where the first group of illumination sources 2211 and the second group of illumination sources 2212 are arranged side by side along the direction perpendicular to the projection of the light beam, the first light spot 226 and the second light spot 227 corresponding to the side-by-side distribution can be formed,
  • the specific relative positional relationship of different groups of illumination light sources in the illumination light sources 221 is not limited here.
  • FIG. 4 is a working schematic diagram of the second embodiment of the focusing method of the projection device of the present application.
  • the settings of the spatial light modulator 322 and the lens 323 in the projection surface 310 and the projection device 320 can be the same as those in the above embodiment, and are not repeated here. repeat.
  • the lighting source 321 can be set to include a first group of lighting sources 3211 and a second group of lighting sources 3212, the first group of lighting beams generated by the first group of lighting sources 3211 and the first group of lighting beams generated by the second group of lighting sources 3212
  • the colors of the second group of light beams are any one of red, orange, yellow, green, blue, purple and white. Different from the first embodiment, in this embodiment, it may be set that the colors of the illumination light beams generated by the first group of illumination light sources 3211 and the second group of illumination light sources 3212 are the same.
  • the first group of lighting sources 3211 and the second group of lighting sources 3212 can be controlled to be switched off sequentially. Form the corresponding first light spot 326 , then control the first group of illumination light sources 3211 to stop working, and then control the second group of illumination light sources 3212 to work, so that the corresponding second light spot 327 can be formed on the projection surface 310 .
  • the order in which the first group of lighting sources 3211 and the second group of lighting sources 3212 work in time series can be flexibly adjusted, which is not limited here.
  • the first group of illumination sources 3211 and the second group of illumination sources 3212 are also controlled to work simultaneously to form the first light spot 326 and the second light spot with the same color on the projection surface 310 327, without limitation here.
  • the projection angles of the illumination light beams generated by the first group of illumination sources 3211 and the second group of illumination sources 3212 towards the projection surface 310 are also set to have a certain difference, so that the first light spot 326 and the second light spot 327 can be partially overlapped or completely separated.
  • the positional distribution relationship of the first light spot 326 and the second light spot 327 on the projection surface 310 is related to the relative position setting of the first group of illumination light sources 3211 and the second group of illumination light sources 3212 , which will not be repeated here.
  • FIG. 5 is a working diagram of a third embodiment of the focusing method of the projection device of the present application.
  • the settings of the spatial light modulator 422 and the lens 423 in the projection surface 410 and the projection device 420 can be the same as those in any of the above embodiments, and the lighting source 421 is set to The projection angles of the illumination light beams generated by each group of illumination light sources toward the projection surface 410 are different, which are the same as any one of the first embodiment and the second embodiment, and will not be repeated here.
  • the illumination light source 421 is configured to include more than two groups of illumination light sources.
  • the color settings of each group of illumination light sources may be the same or different.
  • the colors of each group of lighting sources are the same, it can be set to control different groups of lighting sources to turn on in time sequence; in the application scenario where at least two groups of lighting sources have different colors, it can be set to control different groups of lighting sources Open at the same time, the opening and closing of multiple groups of lighting sources can be flexibly adjusted according to different settings of the lighting sources, and there is no limitation here.
  • At least two light spots formed on the projection surface may not completely overlap or not overlap, and the relative positional relationship between different light spots can be calculated, and then the focus of the lens 423 can be calculated.
  • the focusing distance and the focusing direction realize the focusing of the lens 423 .
  • FIG. 6 is a schematic structural diagram of an embodiment of the projection device of the present application.
  • the projection device 50 includes a controller 51, a light source 52, a spatial light modulator 53 and a lens 54, the light source 52 is used to generate a first illuminating beam and a second illuminating beam, the first illuminating beam and the second illuminating beam Emit from the same position of the spatial light modulator 53 towards the lens 53 and have different incident angles to form a first light spot and a second light spot on the projection surface 60, and the controller 51 is used to project light according to the first light spot and the second light spot.
  • the relative positional relationship on the surface 60 calculates the focusing amount of the lens 53 to focus the lens 53 based on the focusing amount of the lens 53 .
  • the projection device 50 also includes a camera 55, the camera 55 is used to capture the image information of the first light spot and the second light spot, and the controller 51 obtains the position of the first light spot and the second light spot according to the image information of the first light spot and the second light spot. The relative position on the projection plane 60.
  • the camera 55 can be installed on the casing (not shown) of the projection device 50, or can be arranged on a fixed bracket (not shown), and the shooting direction of the camera 55 can be set to face the projection surface 60, so that when the illumination beam generated by the light source 52 forms a spot on the projection surface 60, the positions of the spots of different illumination beams on the projection surface 60 can be photographed, and the specific installation position of the camera 55 is not limited here.
  • the controller 51 controls the light source 52 to project the first lighting beam and the second lighting beam to the lens 54
  • the first lighting beam and the second lighting beam generated by the light source 52 have the same color
  • the first lighting beam and the second lighting beam have the same color.
  • the projected time on the projection surface 60 is different.
  • the first and second lighting beams generated by the light source 52 have the same color
  • the first and second lighting beams can also be projected onto the projection surface 60 at the same time, which is not limited here.
  • the controller 51 controls the light source 52 to project the first lighting beam and the second lighting beam to the lens 54
  • the first lighting beam and the second lighting beam produced by the light source 52 have different colors
  • the first lighting beam and the second lighting beam have different colors. Simultaneously project onto the projection surface 60 .
  • the projecting times of the first and second illuminating beams onto the projection surface 60 may also be different, which is not limited herein.
  • the controller 51 can obtain the relative positional relationship of the light spots of different illumination beams on the projection surface 60 based on the shooting results of the camera 55, so that the controller 51 can calculate the accurate focus of the lens 54 through the relative positional relationship of the light spots of different illumination beams. The direction and distance to adjust.
  • the light source 52 includes at least two groups of lighting sources
  • the controller 51 is further configured to control the at least two groups of lighting sources to project corresponding at least two light spots to the projection surface 60 .
  • the light source 52 can be set to include at least two groups of lighting sources, and the corresponding light spots formed by the at least two groups of lighting sources on the projection surface 60 do not completely overlap or do not overlap at all, so as to facilitate the calculation of the relative positional relationship of the corresponding light spots.
  • controller 51 is further used to calculate the equivalent center point of each light spot by using a weighted average method based on the brightness of each light spot, and calculate the relative position data of at least two light spots based on the equivalent center point, and further based on the relative position
  • the data calculates the deviation data between the preset focus point and the actual focus point, so as to calculate the adjustment direction and the adjustment distance of the lens 54 based on the deviation data.
  • the controller 51 first calculates the equivalent central point of each light spot, and then calculates the relative position data between different light spots, which can make the calculation of the relative position data of different light spots more accurate, and then can more accurately calculate the current position of the lens 54.
  • the deviation data between the actual focus point and the preset focus point determines the specific adjustment direction and distance of the lens 54 to achieve more precise focusing of the lens 54 .
  • the projection device 50 may be a projector, a smart terminal, or other electronic equipment with a projection function, which is not limited here.
  • this application sets at least two sets of lighting sources in the projection device, and sets that the corresponding light spots formed by at least two sets of lighting sources on the projection surface have certain differences, and then records the relative positional relationship of different light spots on the projection surface. , calculate the deviation data between the current focus point of the lens in the projection device and the preset focus point, and then based on the deviation data, the focus of the lens can be realized by adjusting the lens at one time, which can greatly improve the efficiency of lens focus of the projection device , shorten the time for the lens to focus, and reduce the difficulty of focusing the projection device.

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  • General Physics & Mathematics (AREA)
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Abstract

一种投影装置（120）的对焦方法及投影装置（120），包括：向镜头（123）投射第一照明光束和第二照明光束，第一照明光束和第二照明光束从空间光调制器（222）的同一位置射出且具有不同的入射角度；第一照明光束经过镜头（123）后投射在投影面（110）上形成第一光斑（226），第二照明光束经过镜头（123）后投射在投影面（110）上形成第二光斑（227）；基于第一光斑（226）和第二光斑（227）在投影面（110）上的相对位置关系，计算得到镜头（123）的调焦量；基于调焦量对镜头（123）进行调焦。通过上述方式，能够提高投影装置（120）的对焦效率。

Description

投影装置的对焦方法及投影装置 技术领域
本申请属于投影技术领域，具体涉及一种投影装置的对焦方法及投影装置。
背景技术
随着视频技术的不断发展，投影视频产品在市场上的影响越来越大。在移动式商业演示、多媒体会议室、教室、礼堂、广场等各种场合中，都有可能用到投影视频产品。而在投影系统中，镜头对焦准确才能在投影面上打出清晰锐利的画面，但目前的投影机大部分采用的还是比较传统的反差式对焦，通过移动对焦镜片，测量画面的对比度，寻找对比度最大的位置，这个过程中需要镜片在较大的行程内进行移动并持续测量对比度，速度较慢，还存在很大的提升空间。
发明内容
为解决上述技术问题，本申请提供一种投影装置的对焦方法、投影装置及对焦系统，能够提高投影装置的对焦效率。
为解决上述技术问题，本申请提供一种投影装置的对焦方法，包括：向镜头投射第一照明光束和第二照明光束，第一照明光束和第二照明光束从空间光调制器的同一位置射出且具有不同的入射角度；第一照明光束经过镜头后投射在投影面上形成第一光斑，第二照明光束经过镜头后投射在投影面上形成第二光斑；基于第一光斑和第二光斑在投影面上的相对位置关系，计算得到镜头的调焦量；基于调焦量对镜头进行调焦。
其中，第一照明光束和第二照明光束颜色相同，第一照明光束和第二照明光束投射至投影面上的时间不同。
其中，第一照明光束和第二照明光束的颜色不同，第一照明光束 和第二照明光束同时投射至投影面上。
其中，基于第一光斑和第二光斑在投影面上的相对位置关系，计算得到镜头的调焦量之前，包括：
通过摄像头拍摄获取第一光斑的图像信息和第二光斑的图像信息，基于第一光斑的图像信息和第二光斑的图像信息计算得到第一光斑和第二光斑在投影面上的相对位置关系。
其中，基于第一光斑和第二光斑的图像信息计算得到第一光斑和第二光斑在投影面上的相对位置关系，包括：
基于第一光斑和第二光斑的亮度采用加权平均的方法计算第一光斑和第二光斑的等效中心点；基于第一光斑的等效中心点和第二光斑的等效中心点计算第一光斑和第二光斑的相对位置关系。
为解决上述技术问题，本申请进一步提供一种投影装置，包括控制器、光源和镜头，光源用于产生第一照明光束和第二照明光束，第一照明光束和第二照明光束从空间光调制器的同一位置朝向镜头射出且具有不同的入射角度，以在投影面上形成第一光斑和第二光斑，控制器用于根据第一光斑和第二光斑在投影面上的相对位置关系计算镜头的调焦量，以基于镜头的调焦量对镜头进行调焦。
其中，第一照明光束和第二照明光束颜色相同，第一照明光束和第二照明光束投射至投影面上的时间不同。
其中，第一照明光束和第二照明光束的颜色不同，第一照明光束和第二照明光束同时投射至投影面上。
其中，投影装置还包括摄像头，摄像头用于拍摄第一光斑和第二光斑的图像信息，控制器根据第一光斑和第二光斑的图像信息得到第一光斑和第二光斑在投影面上的相对位置。
其中，控制器进一步用于控制摄像头基于第一光斑和第二光斑的图像信息通过亮度加权平均的方法计算第一光斑和第二光斑的等效中心点，以根据第一光斑和第二光斑的等效中心点计算第一光斑和第二光斑的相对位置关系。
本申请的有益效果是：区别与现有技术中投影装置的对焦方法， 本申请通过在投影面上形成至少两个光斑并计算至少两个光斑的相对位置关系，能够快速计算得到镜头的调整方向和调整距离，相比于现有技术中需要在较大的行程内反复移动镜头并持续测量对比度实现投影对焦的技术方案，本申请能够减少测量的次数，并可以通过依次调整镜头实现镜头的对焦，能够大幅度缩短投影装置调整镜头实现对焦的时间进程，提高投影装置的对焦效率；同时本申请通过减少投影设备中镜头的调整次数，能够降低投影装置对焦的难度，减少镜头的移动损耗。
附图说明
图1是投影系统的结构示意图；
图2是本申请投影装置的对焦方法的流程示意图；
图3是本申请投影装置的对焦方法第一实施例的工作示意图；
图4是本申请投影装置的对焦方法第二实施例的工作示意图；
图5是本申请投影装置的对焦方法第三实施例的工作示意图；
图6是本申请投影装置实施例的结构示意图。
具体实施方式
下面将结合本申请实施方式中的附图，对本申请实施方式中的技术方案进行清楚、完整地描述，显然，所描述的实施方式仅仅是本申请一部分实施方式，而不是全部实施方式。基于本申请中的实施方式，本领域普通技术人员在没有做出创造性的劳动前提下所获得的所有其他实施方式，都属于本申请保护的范围。本申请中所表述的“第一”“第二”并不代表先后顺序，仅起到指向作用，本申请中所表述的“和/或”，仅用于描述关联对象的关联关系，表示可以存在三种关系，并非对关联关系的限制。
本申请的发明人经长期研究发现，在投影设备没有理想对焦前，对焦成功时应呈现的清晰锐利的画面会出现模糊，且模糊的方向和大小与照明光的角分布、离焦的方向和程度有关。而相机系统也需要快速且良好的对焦，最简单的方式也是对比度峰值对焦，但伴随着相机 技术的升级，出现了诸如激光测距对焦和相位对焦等技术，实现了更高速的对焦体验，目前单反相机、智能手机等的镜头都广泛使用了这种技术。为了提高投影设备的对焦速度，本申请发明人将相机对焦的思想引入投影设备中实现投影设备的对焦。
请参阅图1，图1是投影系统的结构示意图。
如图1所示，投影系统10包括投影装置120和投影面110，其中投影装置120包括光源121、空间光调制器122以及镜头123。其中，光源121所产生的光束具有一定的扩散角度，可以将其分为上下两部分，空间光调制器122是实时光学信息处理，自适应光学和光计算等现代光学领域的关键器件，可以为液晶光阀。在投影系统10实现理想对焦的情况下，光源121可以在投影面110上形成一个光斑，进而显示出清晰锐利的画面。而在未实现对焦的情况下，如图1所示，由于光束具有一定的扩散角，光源121在投影面110上形成扩散的上下两个光斑，第一光斑126和第二光斑127，进而导致投影面110上形成的画面模糊。
在本申请中，将未实现对焦前光源所产生的光束能够聚焦为一个光斑的位置出定义为预设投影面。其中，在投影面110上，第一光斑126和第二光斑127的上下位置关系以及二者之间的距离，与投影面110和预设投影面111的距离相关。而在能够计算出投影面110和预设投影面111的距离的情况下，也可以确定镜头123实现对焦需要调整的方向和距离，进而可以调整镜头123的方向和距离实现对焦。
为解决上述技术问题，本申请提供一种投影装置的对焦方法，请参阅图2和图3，图2是本申请投影装置的对焦方法的流程示意图，图3是本申请投影装置的对焦方法第一实施例的工作示意图。如图2和图3所示，本申请投影系统20中，投影装置220的对焦方法具体包括以下步骤：
S10：向镜头223投射第一照明光束和第二照明光束，第一照明光束和第二照明光束从空间光调制器222的同一位置射出且具有不同的入射角度。
具体地，向镜头223投射的照明光束可以为两组，分别为第一照明光束和第二照明光束，第一照明光束和第二照明光束从空间光调制器222的同一位置射出且具有不同的入射角度，也可以为两组以上具有不同入射角度从空间光调制器222的同一位置射出上。其中，每组照明光束可以由一组照明光源产生，在一些具体的应用场景中，每组照明光束也可以由多组照明光源产生，此处不作限制。
可选地，在一些具体的应用场景中，投影装置220中的光源221可以包括至少两组照明光源，分别为第一组照明光源2211和第二组照明光源2212，用于产生第一照明光束与第二照明光束。
可选地，第一照明光束和第二照明光束从空间光调制器222的同一位置射出，可以理解为不是绝对意义上的同一位置。不限于本实施例，在本发明所提供的技术方案的基础上，使得第一照明光束和第二照明光束在空间光调制器222上肉眼不能观察出的具有极小差异的两个位置射出也可实现本申请的技术方案，在此不作限制。
S20：第一照明光束经过镜头223后投射在投影面210上形成第一光斑226，第二照明光束经过镜头223后投射在投影面210上形成第二光斑227。
具体地，向镜头223射出的第一照明光束和第二照明光束从空间光调整器222的同一位置射出且具体不同的入射角度，进而第一照明光束和第二照明光束经过镜头223后投射在投影面210上形会成的对应的第一光斑226和第二光斑227，第一光斑226和第二光斑227不会完全重叠，具体可以为部分重叠，也可以为完全不重叠，此处不作限制。
S30：基于第一光斑226和第二光斑227在投影面210上的相对位置关系，计算得到镜头223的调焦量。
其中，至少两个光斑在投影面210上的相对位置关系与镜头223对焦需要调整的方向和距离相关，计算出第一光斑226和第二光斑227在投影面210上的相对位置关系可以计算得到镜头223需要的调焦量。
可选地，在其他实施例中，在基于第一光斑226和第二光斑227在投影面210上的相对位置关系，计算得到镜头223的调焦量之前，需要通过摄像头拍摄获取第一光斑226的图像信息和第二光斑227的图像信息，基于第一光斑226的图像信息和第二光斑227的图像信息计算得到第一光斑226和所述第二光斑227在投影面上的相对位置关系。
可选地，可以采用如下步骤实现基于第一光斑226和第二光斑227的图像信息计算得到第一光斑226和第二光斑227在投影面210上的相对位置关系。
步骤一：基于第一光斑226和第二光斑227的亮度采用加权平均的方法计算第一光斑226和第二光斑227的等效中心点。
因第一光斑226与第二光斑227在投影面210上有一定的分布范围，如果基于投影面210上的光斑直接计算第一光斑226与第二光斑227的相对位置关系，则计算误差较大。因此可以基于每个光斑的亮度采用加权平均的方法计算出光斑的中心点，在通过光斑中心点计算光斑的相对位置关系，可以提高相对位置关系计算的精确度，在其他实施例中，可以提高相对位置关系计算精确度的计算方法都可应用，在此不作限制。
步骤二：基于第一光斑226的等效中心点和第二光斑227的等效中心点计算第一光斑226和第二光斑227的相对位置关系。
具体地，在得到第一光斑226和第二光斑227的相对位置关系，可以采用如下步骤实现计算得到镜头223的调焦量。
步骤三：基于相对位置数据计算预设对焦点与实际成像光斑之间的偏差数据。
实际投影过程中，无法实现将投影装置220对焦至理想对焦点，投影装置220对焦后的对焦点与理想对焦点之间也存在一定偏差。在本申请中，将实际投影过程中对焦后的对焦点定义为预设对焦点，将实际投影过程中对焦前的光源221在投影面210上的光斑定义为实际成像光斑。在未对焦前，光源221在投影面210上形成的实际成像光 斑无法聚焦，且其位置与预设对焦点的偏差数据和镜头223对焦需的调焦量相关。
具体地，不同的镜头223和/或不同的照明光束角度，第一光斑226与第二光斑227的相对位置关系与预设对焦点和实际成像光斑之间的偏差数据的对应关系不同。在一些具体的应用场景中，投影装置在出厂投入使用之前，相关技术人员可对上述对应关系进行测量，并制作对应的查找表，以便于投影装置使用时的对焦过程能够快速计算预设对焦点与实际光斑之间的偏差数据。
步骤四：基于预设对焦点与实际对焦点之间的偏差数据计算镜头的调整方向和调整距离。
具体地，在本实施例中，可以设置投影装置220中包括空间光调制器222和镜头223，可以通过预设对焦点与实际对焦点之间的偏差数据计算得到空间光调制器222和镜头223之间的位置关系，进而得到镜头223所需要的具体调焦量，也即镜头223的具体调整方向和调整距离。
S40：基于调焦量对镜头223进行调焦。
进一步地，基于镜头223所需要的调焦量可以调整镜头223和也空间光调制器222之间的相对位置关系，进而使得不同的照明光束得以在投影面210处聚焦，实现投射角度有差异的不同照明光束在投影面210上能够形成一个光斑，呈现出清晰、锐利的画面，进而实现仅通过一次调整镜头的操作，就能够实现投影装置220中镜头223的对焦，能够大幅度提高投影装置220的对焦效率。
如图3所示，在本实施例的投影系统20中，投影面210和投影装置220中空间光调制器222以及镜头223的设置可以与上文实施例中相同，此处不再赘述。区别于上文实施例，在本实施例中，可以进一步设置投影装置220的照明光源221包括第一组照明光源2211和第二组照明光源2212。其中，照明光源221向投影面210上投射两组照明光束，在投影面210上形成对应的第一光斑226和第二光斑227。具体地，在本实施例中，步骤S10可以包括以下过程：
S11：控制第一组照明光源2211工作，向投影面210上投射对应的第一组照明光束，以在投影面210上形成对应的第一光斑226。
S12：控制第二组照明光源2212工作，向投影面210上投射对应的第二组照明光束，以在投影面210上形成对应的第二光斑227。
具体地，在本实施例中，可以设置第一组照明光源2211所产生的第一组照明光束和第二组照明光源2212所产生的第二组照明光束的颜色均为红色、橙色、黄色、绿色、蓝色、紫色、白色中的任一种。
进一步地，可以设置第一组照明光源2211和第二组照明光源2212所产生的照明光束的颜色不同，实现第一组照明光束的颜色与第二组照明光束的颜色不同。在步骤S10的具体实施过程中，可以控制第一组照明光源2211和第二组照明光源2212同时工作，在投影面210上形成颜色不同的第一光斑226和第二光斑227。
在其他实施例中，也可以控制第一组照明光源2211和第二组照明光源2212按时序工作，并在投影面210上形成颜色不同的第一光斑226和第二光斑227。
在本实施例中，进一步设置第一组照明光源2211和第二组照明光源2212所产生的照明光束朝向投影面210的投射角度具有一定的差异，进而实现第一光斑226和第二光斑227的位置不会完全重叠，具体可以部分重叠，也可以完全分离。
其中，第一光斑226和第二光斑227的相对位置关系与第一组照明光源2211和第二组照明光源2212的相对位置关系相关。
例如，在第一组照明光源2211和第二组照明光源2212在垂直于光束投射的方向上下设置的应用场景中，第一光斑226和第二光斑227沿投影面210延伸方向也呈上下分布的相对位置关系；在第一组照明光源2211和第二组照明光源2212沿垂直于光束投射的方向上并排设置的应用场景中，则可以形成对应并排分布的第一光斑226和第二光斑227，照明光源221中不同组照明光源的具体相对位置关系此处不作限制。
请参阅图4，图4是本申请投影装置的对焦方法第二实施例的工 作示意图。如图4所示，在本实施例中的投影系统30中，投影面310和投影装置320中的空间光调制器322以及镜头323的设置可以与上文实施例中的相同，此处不再赘述。在本实施例中，可以设置照明光源321包括第一组照明光源3211和第二组照明光源3212，第一组照明光源3211所产生的第一组照明光束和第二组照明光源3212所产生的第二组照明光束的颜色均为红色、橙色、黄色、绿色、蓝色、紫色、白色中的任一种。区别于第一实施例，在本实施例中，可以设置第一组照明光源3211和第二组照明光源3212所产生的照明光束的颜色相同。
在本实施例中，步骤S10的具体实施过程中，可以控制第一组照明光源3211和第二组照明光源3212时序开断，例如可以先控制第一组照明光源3211工作，在投影面310上形成对应的第一光斑326，然后控制第一组照明光源3211停止工作，进而控制第二组照明光源3212工作，可以在投影面310上形成对应的第二光斑327。第一组照明光源3211和第二组照明光源3212按时序工作的先后顺序可灵活调整，此处不作限制。
在其他实施例中，在步骤S10的具体实施过程中，也控制第一组照明光源3211和第二组照明光源3212同时工作，在投影面310上形成颜色相同的第一光斑326和第二光斑327，在此不作限制。
具体地，在本实施例中，同样设置第一组照明光源3211和第二组照明光源3212所产生的照明光束朝向投影面310的投射角度具有一定差异，以使得第一光斑326和第二光斑327可以部分重叠也可以完全分离。进一步地，第一光斑326和第二光斑327在投影面310上的位置分布关系与第一组照明光源3211和第二组照明光源3212的相对位置设置相关，此处不再赘述。
进一步地，请参阅图5，图5是本申请投影装置的对焦方法第三实施例的工作示意图。
具体地，在本实施例中的投影系统40中，投影面410和投影装置420中空间光调制器422以及镜头423的设置可以与上文中任一实 施例中相同，且设定照明光源421中的每组照明光源所产生的照明光束朝向投影面410的投射角度有差异，与第一实施例、第二实施例中的任一个相同，此处不再赘述。与上文实施例不同的是，在本实施例中，照明光源421设置为包括多于两组照明光源。
进一步地，在本实施例中，每组照明光源的颜色设置可以相同，也可以不同。其中，在每组照明光源的颜色都相同的应用场景中，可以设置控制不同组照明光源按时序打开；在至少其中两组照明光源的颜色不同的应用场景中，则可以设置控制不同组照明光源同时打开，多组照明光源的开闭可以根据照明光源的不同设置灵活调整，此处不作限制。
通过设置至少两组照明光束的投射角度差异，可以实现在投影面上形成的至少两个光斑不完全重叠或者不重叠，可以计算出不同光斑之间的相对位置关系，进而计算出镜头423对焦的调焦距离和调焦方向，实现镜头423的调焦。
为解决上述技术问题，本申请进一步提供一种投影装置，请参阅图6，图6是本申请投影装置实施例的结构示意图。
如图6所示，投影装置50包括控制器51、光源52、空间光调制器53和镜头54，光源52用于产生第一照明光束和第二照明光束，第一照明光束和第二照明光束从空间光调制器53的同一位置朝向镜头53射出且具有不同的入射角度，以在投影面60上形成第一光斑和第二光斑，控制器51用于根据第一光斑和第二光斑在投影面60上的相对位置关系计算镜头53的调焦量，以基于镜头53的调焦量对镜头53进行调焦。
进一步地，投影装置50还包括摄像头55，摄像头55用于拍摄第一光斑和第二光斑的图像信息，控制器51根据第一光斑和第二光斑的图像信息得到第一光斑和第二光斑在投影面60上的相对位置。
具体地，在本实施例中，摄像头55可以安装在投影装置50的外壳(图未示)，也可以设置在固定支架(图未示)上，且摄像头55的拍摄方向可以设置为朝向投影面60，以在光源52产生的照明光束 在投影面60上形成光斑时，能够拍摄下不同照明光束的光斑在投影面60上的位置，此处对摄像头55的具体安装位置不作限制。
可选地，控制器51控制光源52向镜头54投射第一照明光束和第二照明光束时，光源52产生的第一照明光束和第二照明光束颜色相同，第一照明光束和第二照明光束投射至投影面60上的时间不同。在其他实施例中，光源52产生的第一照明光束和第二照明光束颜色相同，第一照明光束和第二照明光束也可同时投射至投影面60上，在此不作限定。
可选地，控制器51控制光源52向镜头54投射第一照明光束和第二照明光束时，光源52产生的第一照明光束和第二照明光束颜色不同，第一照明光束和第二照明光束同时投射至投影面60上。在其他实施例中，光源52产生的第一照明光束和第二照明光束颜色不同时，第一照明光束和第二照明光束投射至投影面60上的时间也可以不同，在此不作限定。
进一步地，控制器51可以基于摄像头55的拍摄结果获取不同照明光束的光斑在投影面60上的相对位置关系，使得控制器51可以通过不同照明光束的光斑的相对位置关系计算出镜头54准确对焦需要调整的方向和距离。
进一步地，光源52包括至少两组照明光源，控制器51进一步用于控制至少两组照明光源向投影面60投射对应的至少两个光斑。
在本实施例中，可以设置光源52包括至少两组照明光源，且至少两组照明光源在投影面60上形成的对应光斑不完全重叠或者完全不重叠，以便于对应光斑相对位置关系的计算。
进一步地，控制器51进一步用于基于每个光斑的亮度采用加权平均的方法计算每个光斑的等效中心点，并基于等效中心点计算至少两个光斑的相对位置数据，进一步基于相对位置数据计算预设对焦点与实际对焦点之间的偏差数据，以基于偏差数据计算镜头54的调整方向和调整距离。
具体地，控制器51先计算每个光斑的等效中心点，然后计算不 同光斑之间的相对位置数据，可以使得不同光斑的相对位置数据计算更加精确，进而可以更精确地计算镜头54目前的实际对焦点与预设对焦点之间的偏差数据，确定镜头54具体的调整方向及距离，实现镜头54更精准的对焦。
具体地，投影装置50可以为投影机、智能终端以及具有投影功能的其他电子设备，此处不作限制。
综上所述，本申请通过设置投影装置中至少两组照明光源，并设置至少两组照明光源在投影面上形成的对应光斑具有一定差异，进而通过记录不同光斑在投影面上的相对位置关系，计算出投影装置中镜头目前的对焦点与预设对焦点之间的偏差数据，进而可以基于该偏差数据通过一次性调整镜头即可实现镜头的对焦，能够大幅度提高投影装置镜头对焦的效率，缩短镜头对焦的时间，降低投影装置对焦的难度。
所述仅为本申请的实施方式，并非因此限制本申请的专利范围，凡是利用本申请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，均同理包括在本申请的专利保护范围内。

Claims (10)

  1. 一种投影装置的对焦方法，其特征在于，包括：
    向镜头投射第一照明光束和第二照明光束，所述第一照明光束和所述第二照明光束从空间光调制器的同一位置射出且具有不同的入射角度；
    所述第一照明光束经过所述镜头后投射在投影面上形成第一光斑，所述第二照明光束经过所述镜头后投射在所述投影面上形成第二光斑；
    基于所述第一光斑和所述第二光斑在所述投影面上的相对位置关系，计算得到所述镜头的调焦量；
    基于所述调焦量对所述镜头进行调焦。
  2. 根据权利要求1所述的对焦方法，其特征在于，所述第一照明光束和所述第二照明光束颜色相同，所述第一照明光束和所述第二照明光束投射至所述投影面上的时间不同。
  3. 根据权利要求1所述的对焦方法，其特征在于，所述第一照明光束和所述第二照明光束的颜色不同，所述第一照明光束和所述第二照明光束同时投射至所述投影面上。
  4. 根据权利要求1所述的对焦方法，其特征在于，所述基于所述第一光斑和所述第二光斑在所述投影面上的相对位置关系，计算得到所述镜头的调焦量之前，包括：
    通过摄像头拍摄获取所述第一光斑的图像信息和所述第二光斑的图像信息，基于所述第一光斑的图像信息和所述第二光斑的图像信息计算得到所述第一光斑和所述第二光斑在所述投影面上的相对位置关系。
  5. 根据权利要求4所述的对焦方法，其特征在于，所述基于所述第一光斑和所述第二光斑的图像信息计算得到所述第一光斑和所述第二光斑在所述投影面上的相对位置关系，包括：
    基于所述第一光斑和所述第二光斑的亮度采用加权平均的方法 计算所述第一光斑和所述第二光斑的等效中心点；
    基于所述第一光斑的所述等效中心点和所述第二光斑的等效中心点计算所述第一光斑和所述第二光斑的相对位置关系。
  6. 一种投影装置，其特征在于，所述投影装置包括控制器、光源、空间光调制器和镜头，所述光源用于产生第一照明光束和第二照明光束，所述第一照明光束和所述第二照明光束从空间光调制器的同一位置朝向所述镜头射出且具有不同的入射角度，以在所述投影面上形成第一光斑和第二光斑，所述控制器用于根据所述第一光斑和所述第二光斑在所述投影面上的相对位置关系计算所述镜头的调焦量，以基于所述镜头的调焦量对所述镜头进行调焦。
  7. 根据权利要求6所述的投影装置，其特征在于，所述第一照明光束和所述第二照明光束颜色相同，所述第一照明光束和所述第二照明光束投射至所述投影面上的时间不同。
  8. 根据权利要求6所述的投影装置，其特征在于，所述第一照明光束和所述第二照明光束的颜色不同，所述第一照明光束和所述第二照明光束同时投射至所述投影面上。
  9. 根据权利要求6所述的投影装置，其特征在于，所述投影装置还包括摄像头，所述摄像头用于拍摄所述第一光斑和所述第二光斑的图像信息，所述控制器根据所述第一光斑和所述第二光斑的图像信息得到所述第一光斑和所述第二光斑在所述投影面上的相对位置。
  10. 根据权利要求9所述的投影装置，其特征在于，所述控制器进一步用于控制所述摄像头基于所述第一光斑和所述第二光斑的图像信息通过亮度加权平均的方法计算所述第一光斑和所述第二光斑的等效中心点，以根据所述第一光斑和所述第二光斑的等效中心点计算所述第一光斑和所述第二光斑的相对位置关系。
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