CN210327826U

CN210327826U - Projector automatic focusing and trapezoidal correction system based on multi-light-path distance measurement

Info

Publication number: CN210327826U
Application number: CN201921874203.8U
Authority: CN
Inventors: 徐逸
Original assignee: Xingguangpu Technology Chengdu Co ltd
Current assignee: Xingguangpu Technology Chengdu Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-04-14
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses a projector auto focus and trapezoidal correction system based on multi-optical path range finding, this system include multichannel optics range finding system, step motor adjusting lens, the algorithm of function ability more than image four corners electron zoom function and control. The multi-path optical ranging system firstly measures respective distances between the projector and the screen, when the number of the light paths is more than or equal to three paths, the spatial position of the screen relative to the projector can be confirmed according to the distances, then the distance with the best imaging effect is simulated according to the spatial position and the optical parameters of the lens of the projector, then the distance required to be adjusted by the lens is calculated according to the distance, and the distance is adjusted to a proper position by the stepping motor, so that the automatic focusing of the projector is realized.

Description

Projector automatic focusing and trapezoidal correction system based on multi-light-path distance measurement

Technical Field

The utility model belongs to the technical field of the projector is used, concretely relates to projector auto focus and trapezoidal correction system based on many light paths range finding.

Background

With the continuous progress of the technology level, projectors are more and more widely applied to various occasions such as conferences, teaching and even households. In actual use, the placement of the projector may be various. The different positions of the projection devices make the angles between the projection light emitted from the projector and the image plane (such as a curtain or a wall) different. The angle between the projected light and the imaging plane directly affects the shape of the projected image on the imaging plane (which should be a regular rectangle in general). When the angle between the projection light and the imaging plane is not appropriate, the shape of the projected image on the imaging plane may be other shapes.

Because of the characteristics of the projector in use, the position of the projector may be changed frequently, so that the spatial position of the curtain is changed, the position of the lens of the projector is required to be adjusted again, and the projector is not perpendicular to the curtain every time, so that the image of the curtain end far away from the projector is large, the image of the near end is small, the image is inconsistent in size up and down or left and right, and the watching effect is affected. In this case, the image formed by the projector needs to be corrected.

In the prior art, only single-path optical automatic focusing is adopted, the distance from one point of the curtain to the projector can be determined, the spatial position of the curtain relative to the projector cannot be determined, the automatic focusing can be performed on the projector only according to the distance of the single point, and the trapezoidal correction cannot be performed automatically.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects, the inventor of the utility model continuously reforms and innovates and provides the method through long-term exploration and trial and a plurality of experiments and endeavors.

In order to realize the purpose, the utility model adopts the technical scheme that: the utility model provides a projector auto focus and trapezoidal correction system based on multi-path range finding, includes projector, multichannel optical ranging system, step motor adjusting lens, image four corners electron zoom module and controller, step motor adjusting lens dress is on the projector, the controller controls image four corners electron zoom module, step motor adjusting lens and multichannel optical ranging system.

According to the utility model discloses in a projector auto focus and trapezoidal correction system based on multi-optical path range finding, its further preferred technical scheme is: the multi-path optical ranging system is a laser range finder.

According to the utility model discloses in a projector auto focus and trapezoidal correction system based on multi-optical path range finding, its further preferred technical scheme is: the number of the light paths measured by the multi-path optical ranging system is more than or equal to 3.

According to the utility model discloses in a projector auto focus and trapezoidal correction system based on multi-optical path range finding, its further preferred technical scheme is: the light paths are not parallel to each other so as to improve the measurement precision of the spatial position; specifically, the upper limit of an included angle between the light paths is that the distance measuring point is within the display range of the projection picture, and the measurement is more accurate when the angle is larger.

According to the utility model discloses in a projector auto focus and trapezoidal correction system based on multi-optical path range finding, its further preferred technical scheme is: the stepping motor adjusts the lens to simulate the distance between the projector and the curtain with the best imaging effect according to the optical parameters of the lens and the space position of the curtain, and then the optimal adjusting position of the lens is determined according to the distance.

Compared with the prior art, the technical scheme of the utility model have following advantage:

the utility model discloses a spatial position between curtain and the projector is confirmed in the range finding of adjustment many light paths to confirm step motor to the regulation of concrete focus and the correction of four corners electron zoom function to the image shape according to this spatial position, thereby realize auto focus and automatic trapezoidal correction, make the projector all can auto focus and automatic electron trapezoidal correction in any position.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of the present invention.

The reference numbers in the figures are: 1. and 2, a projector, 2, a stepping motor adjusting lens.

Detailed Description

To make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the detailed description of the embodiments of the present invention provided below is not intended to limit the scope of the claimed invention, but is merely representative of selected embodiments of the present invention.

Examples

As shown in fig. 1, the present embodiment provides an auto-focusing and keystone correction system for a projector based on multi-optical-path ranging, which includes a projector 1, a multi-optical-path ranging system, a stepping motor adjusting lens 2, an image four-corner electronic zoom module, and a controller, where the stepping motor adjusting lens is mounted on the projector, and the controller controls the image four-corner electronic zoom module, the stepping motor adjusting lens, and the multi-optical-path ranging system.

The multi-path optical ranging system in the embodiment adopts a laser range finder, and the controller has the capability of calculating the electronic zooming function of the four corners of the image. The multi-path optical ranging system firstly measures respective distances between the projector and the curtain, when the number of the light paths is more than or equal to three paths, the spatial position of the curtain relative to the projector can be confirmed according to the distances, then the distance with the best imaging effect is simulated according to the spatial position and the optical parameters of the lens of the projector, then the distance required to be adjusted by the lens is calculated according to the distance, and the distance is adjusted to a proper position by the stepping motor, so that the automatic focusing of the projector is realized. Meanwhile, the real shape of a projection picture on the curtain is calculated according to the space position of the curtain and the optical parameters of a lens, then the four-corner electronic zooming function is used, the four-corner zooming is carried out on the picture according to a corresponding algorithm, and finally a rectangular image is formed on the curtain. Thereby completing the auto-focus and auto-keystone correction.

The focusing adjustment is to simulate the optimal distance from the projector to the curtain according to the optical parameters of the lens and the space position of the curtain and the optical parameters of the lens, determine the position of the lens to be adjusted according to the distance, and then adjust the lens to a proper position by using a stepping motor through a controller to focus a clear image.

When the image is zoomed, the shape of the picture on the screen is obtained through simple geometric calculation according to the optical parameters of the lens and the space position of the screen regulated by the stepping motor, and the image is zoomed by using the electronic zooming function of four corners to obtain the rectangular pattern.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.

Claims

1. The utility model provides a projector auto focus and trapezoidal correction system based on multi-optical path range finding, includes the projector, its characterized in that still includes multichannel optical ranging system, step motor adjusting lens, image four corners electron zoom module and controller, step motor adjusting lens dress is on the projector, the controller controls image four corners electron zoom module, step motor adjusting lens and multichannel optical ranging system.

2. The system of claim 1, wherein the multi-path optical ranging system is a laser range finder.

3. The system of claim 1, wherein the number of optical paths measured by the multi-path optical ranging system is equal to or greater than 3.

4. The system of claim 3, wherein the optical paths are not parallel to each other, so as to improve the accuracy of the spatial position measurement.

5. The system of claim 4, wherein the upper limit of the included angle between the optical paths is that the distance measuring point is within the display range of the projection screen, and the measurement is more accurate when the angle is larger.

6. The system of claim 3, wherein the stepping motor adjusts the lens to simulate the distance between the projector and the curtain with the best imaging effect according to the optical parameters of the lens and the spatial position of the curtain, and determines the best adjustment position of the lens according to the distance.