WO2022062604A1

WO2022062604A1 - Projection screen adjusting method and apparatus, and projector, and storage medium

Info

Publication number: WO2022062604A1
Application number: PCT/CN2021/106993
Authority: WO
Inventors: 冉鹏; 余金清
Original assignee: 成都极米科技股份有限公司
Priority date: 2020-09-28
Filing date: 2021-07-19
Publication date: 2022-03-31
Also published as: CN114286065A

Abstract

Provided are a projection screen adjusting method and apparatus, and a projector, and a storage medium, relating to the field of projectors. The method comprises: obtaining a selected target area (S200); an adjusting step: adjusting a projection focal length of a light engine to change the size of the current projection area of the light engine; correcting an effective projection screen in the current projection area to change the shape of the effective projection screen (S210); and at least executing the adjusting step once to project the effective projection screen to the selected target area (S220). Adjusting the projection focal length of the light engine can ensure that the loss of brightness and image quality can be avoided when zooming the projected screen, and therefore, combining the adjustment mode with the mode of correcting the effective projection screen in the current projection area can achieve fast and efficient adjustment of the projection screen, project the projection screen to the selected target area, and reduce the loss of brightness and image quality of the projection screen.

Description

Projection screen adjustment method, device, projector and storage medium

technical field

The present application relates to the field of projectors, and in particular, to a method, device, projector and storage medium for adjusting a projection screen.

Background technique

At present, the projector can adjust the projected image through an adaptive adjustment method, avoid corners or obstacles, adjust the image to an area suitable for projection, and adjust it into a rectangle. In essence, the adjustment is realized at the expense of reducing the brightness and image quality of the projected image.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present application is to provide a projection image adjustment method, device, projector and storage medium, which can adjust the projection image and reduce the loss of brightness and image quality of the projection image.

The embodiments of the present application can be implemented as follows:

In a first aspect, an embodiment of the present application provides a projection image adjustment method, which is applied to a projector, where the projector includes an optical machine, and the method includes:

Get the selected target area;

Adjusting step: adjusting the projection focal length of the optical machine to change the size of the current projection area of the optical machine; correcting the effective projection picture in the current projection area to change the shape of the effective projection picture;

The adjusting step is performed at least once to project the effective projection image to the selected target area.

In an optional implementation manner, the step of performing the adjustment step at least once to project the effective projection image to the selected target area includes:

adjusting the projection focal length of the opto-mechanical to zoom the current projection area of the opto-mechanical to a first projection area; the first projection area includes the selected target area;

Correcting a valid projection picture in the current projection area to project the valid projection picture to the selected target area.

Correcting the effective projection picture in the current projection area to project the effective projection picture into the selected inscribed rectangle; the selected inscribed rectangle is the inscribed rectangle of the current projection area, and the selected inscribed rectangle is the inscribed rectangle of the current projection area, and the selected inscribed rectangle is matching the inscribed rectangle with the selected target area;

Under the condition that the effective projection image is not projected to the selected target area, adjust the projection focal length of the opto-mechanical so as to zoom the current projection area to a second projection area; the second projection area includes all the selected target area;

Under the condition that the effective projection picture has not been projected to the selected target area, correct the effective projection picture in the current projection area to project the effective projection picture to the selected target area.

In an optional implementation manner, the step of adjusting the projection focal length of the optomechanical includes:

Calculate the target zoom factor of the projection focal length of the opto-mechanical when the current projection area is zoomed to just include the selected target area;

Determine any multiple Z times between the target zoom factor and the current zoom factor of the optomechanical;

The zoom factor of the optical-mechanical projection focal length is adjusted to the Z times, or the zoom factor of the opto-mechanical projection focal length is adjusted to the target zoom factor.

In an optional implementation manner, the step of calculating the target zoom factor of the projection focal length of the opto-mechanical when the current projection area is zoomed to just include the selected target area includes:

Determine the transmission transformation relationship between the selected target area and the current projection area according to the coordinates of the selected target area and the current projection area of the optomechanical;

According to the transmission transformation relationship, determine the pixel correspondence between the selected target area and the current projection area;

Determine a target zoom area according to the pixel correspondence, the target zoom area includes the selected target area and is connected to a boundary point of the selected target area;

Obtain the multiple relationship between the current projection area and the target zoom area, and use the multiple relationship as the target zoom multiple.

In an optional implementation manner, the step of acquiring the selected target area includes:

Get the feature data of the projection plane;

According to the feature data, obtain a barrier-free area on the projection plane;

The selected target area is acquired in the barrier-free area; the selected target area is the largest inscribed rectangle in the barrier-free area that conforms to a preset throw ratio.

In a second aspect, an embodiment of the present application further provides a method for adjusting a projection image, which is applied to a projector, where the projector includes an optical machine, and the method includes:

Get the selected target area;

In a third aspect, an embodiment of the present application further provides a method for adjusting a projection image, which is applied to a projector, where the projector includes an optical machine, and the method includes:

Get the selected target area;

correcting the effective projection picture in the current projection area of the optomechanical, so as to project the effective projection picture into the selected inscribed rectangle; the selected inscribed rectangle is the inscribed rectangle of the current projection area, and the selected inscribed rectangle matches the selected target area;

In a fourth aspect, an embodiment of the present application further provides a method for adjusting a projection image, which is applied to a projector, where the projector includes an optical machine, and the method includes:

Get the selected target area;

Adjusting the projection focal length of the optomechanical to project an effective projection image onto the selected target area; or,

Adjusting the projection focal length of the optomechanical to change the size of the current projection area of the optomechanical, and correcting the effective projection picture in the original projection area of the optomechanical to change the shape of the effective projection picture so that the A valid projection image is projected to the selected target area.

In a fifth aspect, an embodiment of the present application provides a projection image adjustment device, which is applied to a projector, where the projector includes an optical machine, and the device includes:

Get module, used to get the selected target area;

an adjustment module for performing adjustment steps: adjusting the projection focal length of the optical machine to change the size of the current projection area of the optical machine; correcting the effective projection picture in the current projection area to change the effective projection picture shape;

The adjustment module is further configured to perform the adjustment step at least once to project the effective projection image to the selected target area.

In a sixth aspect, an embodiment of the present application provides a projection image adjustment device, which is applied to a projector, where the projector includes an optical machine, and the device includes:

Get module, used to get the selected target area;

an adjustment module, configured to adjust the projection focal length of the opto-mechanical, so as to zoom the current projection area of the opto-mechanical to a first projection area; the first projection area includes the selected target area;

The adjustment module is further configured to correct the effective projection picture in the current projection area, so as to project the effective projection picture to the selected target area.

In a seventh aspect, an embodiment of the present application provides a projection image adjustment device, which is applied to a projector, where the projector includes an optical machine, and the device includes:

Get module, used to get the selected target area;

The adjustment module is used to correct the effective projection picture in the current projection area of the optomechanical machine, so as to project the effective projection picture into the selected inscribed rectangle; the selected inscribed rectangle is the an inscribed rectangle, and the selected inscribed rectangle matches the selected target area;

The adjustment module is further configured to adjust the projection focal length of the optomechanical under the condition that the effective projection picture is not projected to the selected target area, so as to zoom the current projection area to the second projection area; the second projection area includes the selected target area;

The adjustment module is further configured to correct the effective projection picture in the current projection area under the condition that the effective projection picture has not been projected to the selected target area, so as to project the effective projection picture to the selected target area. the selected target area.

In an eighth aspect, an embodiment of the present application provides a projection image adjustment device, which is applied to a projector, where the projector includes an optical machine, and the device includes:

Get module, used to get the selected target area;

an adjustment module for adjusting the projection focal length of the optomechanical so as to project an effective projection image to the selected target area; or,

The adjustment module is used to adjust the projection focal length of the optomechanical to change the size of the current projection area of the optomechanical, and to correct the effective projection picture in the original projection area of the optomechanical to change the size of the effective projection picture shape so that the effective projection image is projected onto the selected target area.

In a ninth aspect, an embodiment of the present application provides a projector, including:

Optical machine;

A control unit, the control unit includes a processor and a memory, the memory stores program instructions, and the processor is configured to execute the program instructions to implement the method described in any one of the foregoing embodiments.

In a tenth aspect, an embodiment of the present application provides a storage medium, where program instructions are stored on the storage medium, and when the program instructions are executed by a processor, the method described in any one of the foregoing embodiments is implemented.

The projection image adjustment method, device, projector and storage medium provided by the embodiments of the present application adopt the adjustment method of “adjusting the projection focal length of the optical machine” and “correcting the effective projection image in the current projection area” to effectively project the image. The screen is projected to the selected target area. Compared with the prior art, in the embodiment of the present application, the adjustment of the projection focal length of the optomechanical can ensure that the loss of brightness and image quality can be avoided when the projection image is zoomed and zoomed, and it is compared with the correction of the effective projection image in the current projection area. The combination of the method can realize the adjustment of the projection image quickly and efficiently, project the projection image to the selected target area, and reduce the loss of the brightness and image quality of the projection image.

In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the following specific embodiments are given and described in detail in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present application more clearly, the following drawings will briefly introduce the drawings that need to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore do not It should be regarded as a limitation of the area. For those skilled in the art, other related drawings can also be obtained according to these drawings without any creative effort.

FIG. 1 is a schematic diagram of a scene where a projector projects an image to a projection medium;

FIG. 2 is a schematic diagram showing a non-rectangular "trapezoid" on the projection screen of the projector;

3 is a schematic diagram of the picture resolution and picture quality loss of the adjusted projection picture;

Fig. 4 is the schematic diagram of "gray edge" in the projection picture of the projector;

Fig. 5 is the calibration schematic diagram of the projection picture;

6 is a structural block diagram of a projector provided by an embodiment of the present application;

7 is a structural block diagram of a control unit of a projector provided by an embodiment of the present application;

8 is a flowchart of a method for adjusting a projection image provided by an embodiment of the present application;

FIG. 9 is a schematic diagram of an application scenario of the projection image adjustment method provided by the embodiment of the present application;

10 is a schematic diagram of an application scenario of the projection image adjustment method provided by the embodiment of the present application;

FIG. 11 is a flowchart of S210 of the projection image adjustment method provided by the embodiment of the application;

12 is a schematic diagram of an application scenario of the projection image adjustment method provided by the embodiment of the present application;

13 is a schematic diagram of an application scenario of the projection image adjustment method provided by the embodiment of the present application;

14 is a flowchart of S210A of the projection image adjustment method provided by the embodiment of the application;

15 is a flowchart of S210 of the projection image adjustment method provided by the embodiment of the application;

16 is a schematic diagram of an application scenario of the projection image adjustment method provided by the embodiment of the application;

17 is a schematic diagram of an application scenario of the projection image adjustment method provided by the embodiment of the present application;

FIG. 18 is a schematic diagram of an application scenario of the projection image adjustment method provided by the embodiment of the present application;

19 is a flowchart of S210c of the projection image adjustment method provided by the embodiment of the application;

FIG. 20 is a flowchart of S200 of the projection image adjustment method provided by the embodiment of the application;

FIG. 21 shows a flowchart of another method for adjusting a projection image provided by an embodiment of the present application;

FIG. 22 shows a flowchart of another method for adjusting a projection image provided by an embodiment of the present application;

FIG. 23 shows a flowchart of another method for adjusting a projection image provided by an embodiment of the present application.

detailed description

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. The components of the embodiments of the present application generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

Thus, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the claimed area of the application, but is merely representative of selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the protection area of the present application.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of this application, it should be noted that, if the terms "upper", "lower", "inner", "outer", etc. appear, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings, or It is the usual orientation or positional relationship when the product of the invention is used, which is only for the convenience of describing the application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation , so it cannot be construed as a limitation on this application.

In addition, where the terms "first", "second" and the like appear, they are only used to differentiate the description, and should not be construed as indicating or implying relative importance.

It should be noted that the features in the embodiments of the present application may be combined with each other under the condition of no conflict.

During the implementation of the embodiments of the present application, the inventors of the present application found that:

In daily use, the projection screen projected by the projector's optical machine should face the projection screen or projection wall (also known as the projection medium) as much as possible to ensure that the screen has no vertical or horizontal angle. The effect of projection (as shown in Figure 1).

However, there are often many scenes that are difficult to conform to the plane of the opto-mechanical projection screen facing the projection medium, for example, the scene where the projector is installed in the ceiling, the scene where the projector is used in the bedroom, and so on. In actual use, the projection picture projected by the optical machine of the projector basically has an included angle in the vertical direction or the horizontal direction with the plane of the projection medium. In these scenarios, the projected image projected by the projector will present a non-rectangular "trapezoid" state (as shown in Figure 2).

In order to realize that the projector can also project normally in these scenarios, to adjust the trapezoidal projection picture to a standard rectangular projection picture, you need to use the "keystone correction" function of the projector.

Now "Keystone", there are two ways of manual and automatic. The manual mode means that the user calls up the adjustment setting menu, and adjusts the shape of the projection screen by manually controlling the positions of several vertices of the projection screen; the automatic mode is the plane (also known as the plane of the projection medium) collected by the image acquisition module of the projector. It can be called as the projection surface) information, and the projection image is automatically corrected into a rectangle by automatic compensation of the position of the projection image.

The current "keystone correction" has the following disadvantages:

1. The screen resolution and image quality of the adjusted projection screen will be lost due to scaling (as shown in Figure 3);

2. After the adjustment of the projection screen, the normal display content in the projection screen (also known as the effective projection screen) will become smaller, but because the internal structure of the projector's optical machine cannot completely block light, the user can see the normal display. There are obvious "gray borders" around the displayed content (as shown in Figure 4), and the smaller the effective projection screen in the projection screen is, the larger the "gray borders".

In addition, the projector can also perform digital zoom zoom. In order to avoid some walls or objects that are not suitable for projection, the effective projection picture in the projection picture can be reduced by means of digital zoom. Similarly, similar to "Keystone Correction", this method also has image quality loss and "gray edge" phenomenon, and the larger the zoom ratio, the more obvious the image quality loss and the larger the "gray edge" area.

The current projectors basically have the above-mentioned "keystone correction" and digital zooming and zooming functions, which can perform adaptive correction on the projected image, adjust the projected image, avoid corners or obstacles, and adjust the image to an area suitable for projection and adjust to a rectangle. That is to say, the adaptive correction integrates "keystone correction" and digital zoom scaling. First, the information of the projection surface is collected through the image acquisition module. If the projection surface covers the corner of the wall or other objects that are not suitable for projection, such as switches and sockets , murals, hanging cabinets, etc., the projector can directly adjust the effective projection image, avoid corners or obstacles, correct the effective projection image to the most suitable projection area and adjust it into a rectangle (as shown in Figure 5).

To sum up, with the increasing demand in the home projection market, ease of use and projection intelligence are becoming more and more important, and adaptive automatic image correction is one of the trends in intelligence. However, the current projector essentially adjusts the projected image at the expense of reducing the brightness and image quality of the projected image. How to solve the problem of image quality loss and "gray border" is an industry problem.

In order to improve various defects in the above-mentioned prior art, the embodiments of the present application propose a projection image adjustment method, device, projector and storage medium, which can adjust the projection image and reduce the loss of brightness and image quality of the projection image . It should be noted that the various defects existing in the above technical solutions in the prior art are the results obtained by the inventor after careful practical research. Therefore, the discovery process of the above-mentioned problems and the following examples of the present application are aimed at the above-mentioned problems. The proposed solutions to the problems should all be the contributions made by the inventor to the present application in the process of realizing the present application.

First of all, the embodiments of the present application provide a projector capable of adjusting the projection image and reducing the loss of brightness and image quality of the projection image. Please refer to FIG. 6 , which is a structural block diagram of a projector provided by an embodiment of the present application. The projector 100 may include: an optical machine 110 and a control unit 120 .

Wherein, an optical zoom module is provided in the optical machine 110 , and the optical zoom module may include components such as a motor for adjusting the position of the optical lens group in the optical machine 110 . By adjusting the position of the optical lens group in the optomechanical 110 through the optical zoom module, the projection focal length of the optomechanical 110 can be changed, thereby realizing the enlargement or reduction of the projection image of the optomechanical 110, and in the process, the brightness and the image of the projected image are changed. Quality will not be lost, it is a lossless picture processing process.

Further, as shown in FIG. 7 , the above-mentioned control unit 120 may include a memory 121, a processor 122, and the memory 121, the processor 122 and the communication interface may be directly or indirectly electrically connected to realize the connection with other electronic devices data transfer and interaction. The above elements can be electrically connected to each other through buses and/or signal lines.

The above-mentioned memory 121 may store program instructions related to the projection screen adjustment method. The processor 122 may process information and/or data related to projection picture adjustments to perform one or more functions described herein. For example, the processor 122 can execute the program instructions, acquire the selected target area, and adjust the projection image according to the above-mentioned information or data. This enables the projector 100 to adjust the projected image, thereby reducing the loss of brightness and image quality of the projected image.

The above-mentioned memory 121 can be, but is not limited to: a solid state hard disk (Solid State Disk, SSD), a mechanical hard disk (Hard Disk Drive, HDD), a read-only memory (Read Only Memory, ROM), a programmable read-only memory (Programmable Read-only memory). Only Memory, PROM), Erasable Programmable Read-Only Memory (EPROM), Random Access Memory (RAM), Electrical Erasable Programmable Read-Only Memory , EEPROM) etc.

The above-mentioned processor 122 can be, but not limited to: a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; also can be, but not limited to: an application specific integrated circuit (Application Specific Integrated Circuit, ASIC) ), Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. Therefore, the above-mentioned processor 122 may be an integrated circuit chip with signal processing capability.

It can be understood that the structure of the projector 100 shown in FIG. 6 is only a schematic structure, and the projector 100 may further include more or less components or modules than the structure shown in FIG. The structures shown in FIG. 6 are different configurations or configurations. Also, each component shown in FIG. 6 may be implemented by hardware, software, or a combination of both. That is, the present application does not limit the specific type and structure of the projector 100 .

Hereinafter, for ease of understanding, the following embodiments of the present application will take the projector 100 shown in FIG. 6 as an example, in conjunction with the accompanying drawings, to describe the projection image adjustment method provided by the embodiments of the present application.

Referring to FIG. 8 , FIG. 8 shows a flowchart of a method for adjusting a projection image provided by an embodiment of the present application. The projection image adjustment method can be applied to the above-mentioned projector 100, and the projection image adjustment method may include the following steps:

S200, obtain the selected target area.

In this embodiment of the present application, when the projector 100 is running, the projector 100 can project the projection image onto the plane of the projection medium, because the projector 100 may not be facing the plane of the projection medium, and there are often existing objects on the plane of the projection medium. Due to various obstacles (eg, switches, wall decorations, etc.), in the application scenario shown in FIG. 9 , the projected image projected by the projector 100 onto the plane of the projection medium may present a trapezoid shape and cover the obstacles.

In order to prevent the projected image from being disturbed by obstacles and to be displayed normally on the plane of the projection medium, the projector 100 can obtain a selected target area suitable for projection on the plane of the projection medium according to the plane condition of the projection medium. It can be understood that, as shown in FIG. 10 , the above-mentioned selected target area may be a rectangular area in the plane of the projection medium that is unobstructed and conforms to the projection ratio selected by the user.

S210, the adjustment step: adjusting the projection focal length of the optical machine to change the size of the current projection area of the optical machine; correcting the effective projection image in the current projection area to change the shape of the effective projection image.

S220: Execute the adjustment step at least once to project the effective projection image to the selected target area.

In this embodiment, S220 may include the following two feasible projection screen adjustment situations:

1. Adjust the projection focal length of the optical machine to project the effective projection image to the selected target area;

2. Adjust the projection focal length of the optical machine and the shape of the effective projection image to project the effective projection image to the selected target area.

In the actual application process, since the plane conditions of the projection medium are various, and the relative positional relationship between the projector 100 and the plane of the projection medium is not fixed, therefore, combining the above two feasible projection screen adjustment conditions, one of S220 A complete possible implementation is:

Determine whether the effective projection image of the optomechanical 110 is consistent with the selected target area by adjusting the projection focal length of the optomechanical 110; The target area is consistent;

If so, adjust the projection focal length of the optical machine to project the effective projection image to the selected target area;

If not, the effective projection image is projected to the selected target area by adjusting the projection focal length of the optomechanical and the shape of the effective projection image.

It should be noted that the present application does not limit the specific implementation of S220, and the projector 100 can be adaptively adjusted according to actual application scenarios.

In addition, in practical applications, after acquiring the selected target area, the projector 100 in this embodiment can also adjust the projection focal length of the optical machine and/or correct the effective projection image in the current projection area to convert the A valid projection image is projected to the selected target area.

It should be understood that, in the projection image adjustment method provided by the embodiments of the present application, the effective projection image is projected by using a combination of “adjusting the projection focal length of the optical machine” and “correcting the effective projection image in the current projection area”. to the selected target area. Compared with the prior art, in the embodiment of the present application, adjusting the projection focal length of the opto-mechanical can ensure that the loss of brightness and image quality can be avoided when the projection image is zoomed, which is compared with the effective correction in the current projection area. The combination of projection images can quickly and efficiently adjust the projection images, project the projection images to the selected target area, and reduce the loss of brightness and image quality of the projection images.

Further, in some possible embodiments, for the above-mentioned "execute the adjustment step at least once to project the effective projection image to the selected target area", on the basis of the method provided in FIG. 8 , this application The embodiment provides a feasible embodiment as shown in FIG. 11 , please refer to FIG. 11 , S220 may include the following sub-steps:

S220A, adjusting the projection focal length of the optical machine to zoom the current projection area of the optical machine to the first projection area; the first projection area includes the selected target area.

As shown in FIG. 12 , the projector 100 can adjust the projection focal length of the opto-mechanical 110 to zoom its current projection area to the first projection area including the selected target area. In practical applications, the selected target area may be smaller than the current projection area, or may be larger than the current projection area, and the first projection area may be smaller than the current projection area, or may be larger than the current projection area.

Therefore, when the first projection area is smaller than the current projection area, you can adjust the projection focal length of the optomechanical 110 to reduce the current projection area of the optomechanical 110 to the first projection area; when the first projection area is larger than the current projection area, you can adjust the The projection focal length of the opto-mechanical 110 enlarges the current projection area of the opto-mechanical 110 to the first projection area.

S220B, correcting the valid projection images in the current projection area, so as to project the valid projection images to the selected target area.

In this embodiment, as shown in FIG. 13 , after zooming the current projection area of the optomechanical 110 to the first projection area, the projector 100 can use “keystone correction” and digital zooming (ie, adaptive correction) to A valid projection image is projected to the selected target area.

Further, for the above-mentioned "adjusting the projection focal length of the opto-mechanical so as to zoom the current projection area of the opto-mechanical to the first projection area", on the basis of the method provided in FIG. 11 , the embodiment of the present application provides a For a feasible embodiment shown in FIG. 14, please refer to FIG. 14, S220A may include the following sub-steps:

S220A-1: Calculate the target zoom factor of the projection focal length of the optomechanical when the current projection area is zoomed to just include the selected target area.

In this embodiment, the above-mentioned "exactly including the selected target area" can be understood as: including the selected target area and connecting with a boundary point of the selected target area (as shown in the first projection area in FIG. 12 ) ).

S220A-2, determine any multiple Z times between the target zoom factor and the current zoom factor of the optical machine.

S220A-3: Adjust the zoom factor of the projection focal length of the optomechanical to Z times, or adjust the zoom factor of the projection focal length of the optomechanical to the target zoom factor, so as to zoom the current projection area of the optomechanical to the first projection area.

It can be understood that, since the target zoom factor is the zoom factor of the optical-mechanical projection focal length when the current projection area is zoomed to just include the selected target area, therefore, as long as the zoom factor of the projection focal length of the opto-mechanical 110 does not exceed the target zoom factor , its current projection area always includes the selected target area, thereby ensuring that the current projection area of the optomechanical machine is zoomed to the first projection area including the selected target area.

It should be understood that as long as the adjustment of the projection focal length of the optomechanical 110 is combined with the adjustment of the shape of the effective projection image of the optomechanical 110, the purpose of reducing the loss of brightness and image quality of the projected image can be achieved. The zoom factor of the projection focal length is adjusted to any multiple between the current zoom factor and the target zoom factor, so as to achieve the purpose of reducing the loss of brightness and image quality of the projected image.

In order to avoid the loss of brightness and image quality of the projected image to the greatest extent, the projector 100 may adjust the zoom factor of the projection focal length of the optomechanical 110 to the target zoom factor. In other words, the projector 100 can adjust the projection focal length of the opto-mechanical 110 to zoom the current projection area of the opto-mechanical 110 to the first projection area that just includes the selected target area (that is, the first projection area includes the selected target area, and just circumscribes a boundary point of the selected target area).

It should be noted that, since in practical applications, the range of the zoom factor of the projection focal length of the optical-mechanical 110 of the projector 100 is limited, when the zoom factor of the projection focal length of the optical-mechanical 110 cannot be adjusted to the target zoom factor, the The zoom factor of the projection focal length of the optical machine 110 is adjusted to a limit zoom factor close to the target zoom factor.

For example, when the target zoom factor is 0.3, the zoom range of the opto-mechanical 110 of the projector 100 is 0.4 to 1.0 (the limit zoom factors are 0.4 and 1.0 respectively), and the current zoom factor is 0.8, the opto-mechanical 110 can be The zoom factor of the projected focal length is adjusted to 0.4 (the minimum limit zoom factor).

Wherein, when the projector 100 adjusts the zoom factor of the projection focal length of the optical machine 110, the projector 100 can scale the projection focal length along the projection center of the opto-mechanical 110 according to the target zoom factor and the aspect ratio of the projection, thereby realizing the current Scaling of the projected area.

In this embodiment, the above-mentioned process of adjusting the zoom factor of the projection focal length of the optical machine 110 can be completely calculated and controlled by a program. Its control principle can be set in advance. For example, it is assumed that the relationship between the motor rotation amount (number of steps) x of the optical zoom module and the zoom factor y of the current projection screen of the optical machine is a linear function relationship y=a*x+b, where a and b can be obtained through experiments, that is, calculated in combination with the design of the actual optomechanical 110 and the collected data of the actual zoom effect.

In addition, the relationship between the motor rotation amount (number of steps) x of the optical zoom module and the zoom factor y of the current projection screen of the optical machine may also be a non-linear relationship, which can be fitted by pre-collecting the measured data set, y= f(x). By setting the driver program according to the above functional relationship, the projector 100 can realize the adjustment of the zoom factor of the projection focal length of the optical machine 110 .

Further, in some other possible embodiments, for the above-mentioned “execute the adjustment step at least once to project the effective projection image to the selected target area”, on the basis of the method provided in FIG. 8 , this The application embodiment also provides a feasible embodiment as shown in FIG. 15 , please refer to FIG. 15 , S220 may also include the following sub-steps:

S220a, correcting the effective projection picture in the current projection area to project the effective projection picture into the selected inscribed rectangle; the selected inscribed rectangle is the inscribed rectangle of the current projection area, and the selected inscribed rectangle and the selected target region match.

Before performing this step, the largest inscribed rectangle of the current projection area of the optomechanical can be obtained; the largest inscribed rectangle matches the selected target area.

As shown in Figure 16, "the largest inscribed rectangle matches the selected target area" can be understood as: the aspect ratio of the largest inscribed rectangle is consistent with the selected target area, that is, the largest inscribed rectangle matches the selected target area resemblance.

Furthermore, self-adaptive correction is performed on the effective projection image of the optomechanical, so as to project the effective projection image into the largest inscribed rectangle (as shown in FIG. 17 ).

S220b, under the condition that the effective projection image is not projected to the selected target area, adjust the projection focal length of the optical machine to zoom the current projection area to the second projection area; the second projection area includes the selected target area.

As shown in FIG. 18 , under the condition that the effective projection image is not projected to the selected target area, the projector 100 can adjust the projection focal length of the opto-mechanical 110 to zoom the current projection area to the second projection area including the selected target area . In practical applications, the selected target area may be smaller than the current projection area, or may be larger than the current projection area, and the second projection area may be smaller than the current projection area, or may be larger than the current projection area.

Therefore, when the second projection area is smaller than the current projection area, you can adjust the projection focal length of the optomechanical 110 to reduce the current projection area of the optomechanical 110 to the second projection area; when the second projection area is larger than the current projection area, you can adjust the The projection focal length of the opto-mechanical 110 enlarges the current projection area of the opto-mechanical 110 to the second projection area.

S220c, under the condition that the effective projection picture has not been projected to the selected target area, correct the effective projection picture in the current projection area to project the effective projection picture to the selected target area.

It can be understood that, for the foregoing S220a and S220c, reference may be made to the foregoing S220B, which will not be repeated here.

Further, regarding the above-mentioned how to “adjust the projection focal length of the opto-mechanical so as to zoom the current projection area to the second projection area”, based on the method provided in FIG. 15 , the embodiment of the present application provides a method as shown in FIG. 19 For the illustrated feasible embodiment, please refer to FIG. 19, S220b may include the following sub-steps:

S220b-1: Calculate the target zoom factor of the projection focal length of the optomechanical when the current projection area is zoomed to just include the selected target area.

S220b-2: Determine any multiple Z times between the target zoom factor and the current zoom factor of the optical machine.

S220b-3: Adjust the zoom factor of the projection focal length of the optomechanical to Z times, or adjust the zoom factor of the projection focal length of the optomechanical to the target zoom factor, so as to zoom the current projection area of the optomechanical to the second projection area.

It can be understood that the foregoing S220b-1, S220b-2, and S220b-3 may refer to the foregoing S220A-1, S220A-2, and S220A-3, respectively, which will not be repeated here.

Further, in the above S220b-1 and S220A-1, the method of "calculating the target zoom factor of the projection focal length of the opto-mechanical when the current projection area is zoomed to just include the selected target area" may be:

According to the coordinates of the selected target area and the coordinates of the current projection area of the optomechanical, determine the transmission transformation relationship between the selected target area and the current projection area of the optomechanical;

Determine the pixel correspondence between the selected target area and the current projection area according to the transmission transformation relationship;

Take the multiple relationship between the current projection area and the target zoom area as the target zoom factor.

It should be noted that, for the manner of "obtaining the target zoom factor", reference may be made to the prior art, and details are not described herein again.

Further, in some possible embodiments, for how to "obtain the selected target area", based on the method provided in FIG. 8 , this embodiment of the present application provides a feasible embodiment as shown in FIG. 20 . , please refer to Figure 20, S200 may include the following sub-steps:

S200A, acquiring feature data of the projection plane.

For example, the feature data of the projection plane can be acquired through the image acquisition module of the projector 100 .

The image acquisition module may include a camera module or other depth information measurement modules, such as TOF (time-of-flight, time-of-flight) modules, etc., through the image acquisition module to obtain image information and position information of the image projected by the optical machine 110 And the three-dimensional information of the projection surface, etc., and then fuse the obtained information to calculate the relevant parameters of image correction. And use the image correction related parameters to calculate the projected 3D point cloud information, image segmentation information, and screen coordinate information, so as to obtain the plane area, plane equation and contour (ie, feature data) suitable for projection.

S200B, obtaining an obstacle-free area on the projection plane according to the feature data.

For example, the projection plane is segmented according to the feature data, and an area suitable for projection without obstacles is identified in the segmented area as an unobstructed area.

S200C, obtaining the selected target area in the barrier-free area; the selected target area is the largest inscribed rectangle in the barrier-free area that conforms to the preset projection ratio.

For example, after obtaining an unobstructed area on the projection plane according to the feature data, the largest inscribed rectangle that meets the user's projection ratio (for example, 16:9, etc.) requirement can be determined based on this area.

Further, an embodiment of the present application further provides another method for adjusting a projection image. Please refer to FIG. 21 , which shows a flowchart of another method for adjusting a projection image provided by an embodiment of the present application. The projection image adjustment method can be applied to the above-mentioned projector 100, and the projection image adjustment method may include the following steps:

S400, obtaining the selected target area;

S410, adjusting the projection focal length of the optical machine to zoom the current projection area of the optical machine to the first projection area; the first projection area includes the selected target area;

S420, correcting the effective projection picture in the current projection area, so as to project the effective projection picture to the selected target area.

It should be understood that, for the implementation of S400 and its effects, reference may be made to S200 in the foregoing embodiment, and details are not described herein again. For the implementation of S410 and its effects, reference may be made to S220A in the foregoing embodiment, and details are not described herein again. For the implementation of S420 and its effects, reference may be made to S220B in the foregoing embodiment, and details are not described herein again.

It should be understood that this method uses a combination of "adjusting the projection focal length of the optical machine" and "correcting the effective projection image in the current projection area" to project the effective projection image to the selected target area. Compared with the prior art, in the embodiment of the present application, the adjustment of the projection focal length of the optomechanical can ensure that the loss of brightness and image quality can be avoided when the projection image is zoomed and zoomed, and it is compared with the correction of the effective projection image in the current projection area. The combination of the method can realize the adjustment of the projection image quickly and efficiently, project the projection image to the selected target area, and reduce the loss of the brightness and image quality of the projection image.

In this embodiment, for how to "adjust the projection focal length of the optical machine to zoom the current projection area of the optical machine to the first projection area" in S410, in a feasible implementation, S410 may include: calculating the current When the projection area is zoomed to just include the selected target area, the target zoom factor of the projection focal length of the optomechanical; determine any multiple Z times between the target zoom factor and the current zoom factor of the optomechanical; zoom the projection focal length of the optomechanical Adjust the magnification to Z times, or adjust the zoom factor of the projection focal length of the optomechanical to the target zoom factor, so as to zoom the current projection area of the optomechanical to the first projection area.

Among them, the method of "calculating the target zoom factor of the optical-mechanical projection focal length when the current projection area is zoomed to just include the selected target area" can be: according to the coordinates of the selected target area and the coordinates of the current projection area of the opto-mechanical, determine The transmission transformation relationship between the selected target area and the current projection area of the optomechanical; the pixel correspondence between the selected target area and the current projection area is determined according to the transmission transformation relationship; the target zoom area is determined according to the pixel correspondence, and the target zoom area includes the selected The target area is connected to a boundary point of the selected target area; the multiple relationship between the current projection area and the target zoom area is taken as the target zoom factor. It should be understood that, for the process and effect of the feasible implementation manner of S410, reference may be made to S220A-1, S220A-2, and S220A-3 in the foregoing embodiment, and details are not described herein again.

Further, the projection screen adjustment method may further include: acquiring feature data of the projection plane; acquiring a barrier-free area on the projection plane according to the feature data; acquiring a selected target area in the barrier-free area; selecting the target area as a barrier-free area The largest inscribed rectangle that matches the preset throw ratio. It should be understood that, for the process and effect of this feasible implementation manner, reference may be made to S200A-S200C in the foregoing embodiment, and details are not described herein again.

Further, an embodiment of the present application also provides another method for adjusting a projection image. Please refer to FIG. 22 , which shows a flowchart of another method for adjusting a projection image provided by an embodiment of the present application. The projection image adjustment method can be applied to the above-mentioned projector 100, and the projection image adjustment method may include the following steps:

S500, acquiring the selected target area;

S510, correcting the effective projection picture in the current projection area of the optical machine, so as to project the effective projection picture into the selected inscribed rectangle; the selected inscribed rectangle is the inscribed rectangle of the current projection area, and the selected inscribed rectangle is the same as the selected inscribed rectangle. Selected target area matching;

S520, under the condition that the effective projection picture is not projected to the selected target area, adjust the projection focal length of the optical machine to zoom the current projection area to the second projection area; the second projection area includes the selected target area;

S530 , under the condition that the effective projection picture has not been projected to the selected target area, correct the effective projection picture in the current projection area, so as to project the effective projection picture to the selected target area.

It should be understood that, for the implementation of S500 and its effects, reference may be made to S200 in the foregoing embodiment, and details are not described herein again. For the implementations and effects of S510, S520, and S530, reference may be made to S220a, S220b, and S220c in the foregoing embodiment, and details are not repeated here.

In this embodiment, for how to "adjust the projection focal length of the optical machine to zoom the current projection area of the optical machine to the first projection area" in S520, in a feasible implementation, S520 may include: calculating the current When the projection area is zoomed to just include the selected target area, the target zoom factor of the projection focal length of the optomechanical; determine any multiple Z times between the target zoom factor and the current zoom factor of the optomechanical; zoom the projection focal length of the optomechanical Adjust the magnification to Z times, or adjust the zoom factor of the projection focal length of the optomechanical to the target zoom factor, so as to zoom the current projection area of the optomechanical to the first projection area.

Among them, the method of "calculating the target zoom factor of the optical-mechanical projection focal length when the current projection area is zoomed to just include the selected target area" can be: according to the coordinates of the selected target area and the coordinates of the current projection area of the opto-mechanical, determine The transmission transformation relationship between the selected target area and the current projection area of the optomechanical; the pixel correspondence between the selected target area and the current projection area is determined according to the transmission transformation relationship; the target zoom area is determined according to the pixel correspondence, and the target zoom area includes the selected The target area is connected to a boundary point of the selected target area; the multiple relationship between the current projection area and the target zoom area is taken as the target zoom factor. It should be understood that, for the process and effect of the feasible implementation manner of S520, reference may be made to S220b-1, S220b-2 and S220b-3 in the foregoing embodiment, and details are not described herein again.

Further, an embodiment of the present application also provides another method for adjusting a projection image. Please refer to FIG. 23 , which shows a flowchart of another method for adjusting a projection image provided by an embodiment of the present application. The projection image adjustment method can be applied to the above-mentioned projector 100, and the projection image adjustment method may include the following steps:

S600, acquiring the selected target area;

S610, adjust the projection focal length of the optomechanical to project the effective projection image to the selected target area; or, adjust the projection focal length of the optomechanical to change the size of the current projection area of the optomechanical, and correct the original projection area of the optomechanical to change the shape of the effective projection image, so that the effective projection image is projected to the selected target area.

It should be understood that, for the implementation of S600 and its effects, reference may be made to S200 in the foregoing embodiment, and details are not described herein again. For the implementation of S610 and its effects, reference may be made to S210 and S220 in the foregoing embodiment, and details are not described herein again.

In order to perform the corresponding steps in the foregoing embodiments and possible manners, an implementation manner of an apparatus for adjusting a projection image and a functional block diagram of another apparatus for adjusting a projection image provided by an embodiment of the present application are given below. It should be noted that the basic principle and the technical effect of another projection image adjusting device 900 provided in this embodiment are the same as those of the above-mentioned embodiment. The corresponding content in the above-mentioned embodiment. The still another projection image adjustment apparatus 900 may include: an acquisition module 910 and an adjustment module 920 .

Optionally, the above modules may be stored in a memory or solidified in the projector 100 provided by the present application in the form of software or firmware (Firmware), and may be executed by a processor in the projector 100 . Meanwhile, data required to execute the above-mentioned modules, codes of programs, and the like may be stored in the memory.

It can be understood that the acquisition module 910 can be used to support the projector 100 to perform the above-mentioned S600, etc., and/or other processes used in the techniques described herein, eg, S200A to S200C; the adjustment module 920 can be used to support the projector 100 Perform S610, etc. above, and/or other processes for the techniques described herein, eg, S220A, S220B, S220A-1 to S220A-3, S220a to S220c, S220b-1 to S220b-3.

Based on the foregoing method embodiments, embodiments of the present application further provide a storage medium, where a computer program is stored thereon, and the computer program executes the steps of the foregoing projection image adjustment method when the computer program is run by a processor.

The storage medium can be a general storage medium, such as a removable disk, a hard disk, etc. When the computer program on the storage medium is run, the above-mentioned projection image adjustment method can be executed, so as to solve the problem of "currently, the projector can use the adaptive adjustment method, Adjust the projection screen, avoid corners or obstacles, adjust the screen to an area suitable for projection and adjust it into a rectangle. It is essentially an adjustment at the expense of reducing the brightness and image quality of the projected screen. The adjustment of the projection screen is for the purpose of reducing the loss of brightness and image quality of the projection screen.

To sum up, the projection image adjustment method, device, projector and storage medium provided by the embodiments of the present application use a combination of "adjusting the projection focal length of the optical machine" and "correcting the effective projection image in the current projection area" to project the effective projection image to the selected target area. Compared with the prior art, in the embodiment of the present application, adjusting the projection focal length of the opto-mechanical can ensure that the loss of brightness and image quality can be avoided when the projection image is zoomed, which is compared with the effective correction in the current projection area. The combination of projection images can quickly and efficiently adjust the projection images, project the projection images to the selected target area, and reduce the loss of brightness and image quality of the projection images.

The above are only specific embodiments of the present application, but the protection area of the present application is not limited to this. Any person skilled in the art who is familiar with the technical area disclosed in the present application can easily think of changes or substitutions. All should be covered within the protection area of this application. Therefore, the protection area of the present application shall be subject to the protection area of the claims.

Claims

A projection image adjustment method, characterized in that, when applied to a projector, the projector includes an optical machine, and the method includes:

Get the selected target area;

Adjusting step: adjusting the projection focal length of the optical machine to change the size of the current projection area of the optical machine; correcting the effective projection picture in the current projection area to change the shape of the effective projection picture;

The adjusting step is performed at least once to project the effective projection image to the selected target area.
The method according to claim 1, wherein the step of performing the adjustment step at least once to project the effective projection image to the selected target area comprises:

adjusting the projection focal length of the opto-mechanical to zoom the current projection area of the opto-mechanical to a first projection area; the first projection area includes the selected target area;

Correcting a valid projection picture in the current projection area to project the valid projection picture to the selected target area.
The method according to claim 1, wherein the step of performing the adjustment step at least once to project the effective projection image to the selected target area comprises:

Correcting the effective projection picture in the current projection area to project the effective projection picture into the selected inscribed rectangle; the selected inscribed rectangle is the inscribed rectangle of the current projection area, and the selected inscribed rectangle is the inscribed rectangle of the current projection area, and the selected inscribed rectangle is matching the inscribed rectangle with the selected target area;

Under the condition that the effective projection image is not projected to the selected target area, adjust the projection focal length of the opto-mechanical so as to zoom the current projection area to a second projection area; the second projection area includes all the selected target area;

Under the condition that the effective projection picture has not been projected to the selected target area, correct the effective projection picture in the current projection area to project the effective projection picture to the selected target area.
The method according to claim 2 or 3, wherein the step of adjusting the projection focal length of the optomechanical comprises:

Calculate the target zoom factor of the projection focal length of the opto-mechanical when the current projection area is zoomed to just include the selected target area;

Determine any multiple Z times between the target zoom factor and the current zoom factor of the optomechanical;

The zoom factor of the optical-mechanical projection focal length is adjusted to the Z times, or the zoom factor of the opto-mechanical projection focal length is adjusted to the target zoom factor.
The method according to claim 4, wherein the step of calculating the target zoom factor of the projection focal length of the opto-mechanical when the current projection area is zoomed to just include the selected target area, comprises:

Determine the transmission transformation relationship between the selected target area and the current projection area according to the coordinates of the selected target area and the current projection area of the optomechanical;

According to the transmission transformation relationship, determine the pixel correspondence between the selected target area and the current projection area;

Determine a target zoom area according to the pixel correspondence, the target zoom area includes the selected target area and is connected to a boundary point of the selected target area;

Obtain the multiple relationship between the current projection area and the target zoom area, and use the multiple relationship as the target zoom multiple.
The method according to claim 1, wherein the step of acquiring the selected target area comprises:

Get the feature data of the projection plane;

According to the feature data, obtain a barrier-free area on the projection plane;

The selected target area is acquired in the barrier-free area; the selected target area is the largest inscribed rectangle in the barrier-free area that conforms to a preset throw ratio.
A projection image adjustment method, characterized in that, when applied to a projector, the projector includes an optical machine, and the method includes:

Get the selected target area;

adjusting the projection focal length of the opto-mechanical to zoom the current projection area of the opto-mechanical to a first projection area; the first projection area includes the selected target area;

Correcting valid projection images in the current projection area to project the valid projection images to the selected target area.
A projection image adjustment method, characterized in that it is applied to a projector, wherein the projector includes an optical machine, and the method includes: acquiring a selected target area;

correcting the effective projection picture in the current projection area of the optomechanical, so as to project the effective projection picture into the selected inscribed rectangle; the selected inscribed rectangle is the inscribed rectangle of the current projection area, and the selected inscribed rectangle matches the selected target area;

Under the condition that the effective projection image is not projected to the selected target area, adjust the projection focal length of the opto-mechanical so as to zoom the current projection area to a second projection area; the second projection area includes all the selected target area;

Under the condition that the effective projection picture has not been projected to the selected target area, correct the effective projection picture in the current projection area to project the effective projection picture to the selected target area.
A projection image adjustment method, characterized in that, when applied to a projector, the projector includes an optical machine, and the method includes:

Get the selected target area;

Adjusting the projection focal length of the optomechanical to project an effective projection image onto the selected target area; or,

Adjusting the projection focal length of the optomechanical to change the size of the current projection area of the optomechanical, and correcting the effective projection picture in the original projection area of the optomechanical to change the shape of the effective projection picture so that the A valid projection image is projected to the selected target area.
A projection image adjustment device, characterized in that, it is applied to a projector, the projector includes an opto-mechanical, and the device includes:

Get module, used to get the selected target area;

an adjustment module for performing adjustment steps: adjusting the projection focal length of the optical machine to change the size of the current projection area of the optical machine; correcting the effective projection picture in the current projection area to change the effective projection picture shape;

The adjustment module is further configured to perform the adjustment step at least once to project the effective projection image to the selected target area.
A projection image adjustment device, characterized in that, it is applied to a projector, the projector includes an opto-mechanical, and the device includes:

Get module, used to get the selected target area;

an adjustment module, configured to adjust the projection focal length of the opto-mechanical, so as to zoom the current projection area of the opto-mechanical to a first projection area; the first projection area includes the selected target area;

The adjustment module is further configured to correct the effective projection picture in the current projection area, so as to project the effective projection picture to the selected target area.
A projection image adjustment device is characterized in that, it is applied to a projector, the projector includes an optical machine, and the device includes:

Get module, used to get the selected target area;

The adjustment module is used for correcting the effective projection picture in the current projection area of the opto-mechanical machine, so as to project the effective projection picture into the selected inscribed rectangle; the selected inscribed rectangle is the size of the current projection area an inscribed rectangle, and the selected inscribed rectangle matches the selected target area;

The adjustment module is further configured to adjust the projection focal length of the optomechanical under the condition that the effective projection picture is not projected to the selected target area, so as to zoom the current projection area to the second projection area; the second projection area includes the selected target area;

The adjustment module is further configured to correct the effective projection picture in the current projection area under the condition that the effective projection picture has not been projected to the selected target area, so as to project the effective projection picture to the selected target area. the selected target area.
A projection image adjustment device is characterized in that, it is applied to a projector, the projector includes an optical machine, and the device includes:

Get module, used to get the selected target area;

an adjustment module for adjusting the projection focal length of the optomechanical so as to project an effective projection image to the selected target area; or,

The adjustment module is used to adjust the projection focal length of the opto-mechanical to change the size of the current projection area of the opto-mechanical, and to correct the effective projection picture in the original projection area of the opto-mechanical to change the size of the effective projection picture shape so that the effective projection image is projected onto the selected target area.
A projector, characterized in that it includes:

Optical machine;

A control unit, the control unit includes a processor and a memory, the memory stores program instructions, the processor is configured to execute the program instructions to implement the method of any one of claims 1 to 9.
A storage medium, characterized in that, program instructions are stored on the storage medium, and when the program instructions are executed by a processor, the method according to any one of claims 1 to 9 is implemented.