WO2022205814A1

WO2022205814A1 - Target coordinate determination method and apparatus

Info

Publication number: WO2022205814A1
Application number: PCT/CN2021/120719
Authority: WO
Inventors: 张立造
Original assignee: 成都极米科技股份有限公司
Priority date: 2021-03-31
Filing date: 2021-09-26
Publication date: 2022-10-06
Also published as: CN115150598B; CN115150598A

Abstract

The present application discloses a target coordinate determination method and apparatus. The method comprises: determining a first distance between a first predetermined position of a first projection area and an equivalent optical zooming reference point, wherein the first projection area is a zoomed projection picture of a second projection area; determining a second distance between a second predetermined position of the second projection picture and the equivalent optical zooming reference point; determining a ratio between the first distance and the second distance, and determining a position of a target point between the equivalent optical zooming reference point and the second predetermined position according to the ratio; determining a second mapping relationship according to the position of the target point and the first predetermined position; and obtain a target coordinate according to the coordinate of the second predetermined position and the second mapping relationship, wherein the target coordinate is a projection coordinate set when the projection apparatus performs projection. The present application solves the technical problem that, due to the existence of a projection angle, optical zooming after keystone correction causes a keystone-corrected rectangle to revert to a trapezoid.

Description

Method and device for determining target coordinates

technical field

The present application relates to the field of projection, and in particular, to a method and device for determining target coordinates.

Background technique

In order to ensure that the projected picture is square in the side projection display, obstacle avoidance display and other usage scenarios, the digital keystone correction function is often used to partially display and partially hide the original full-screen content to achieve the effect of a square picture in the physical world. For machines with optical zoom, after adjusting the keystone correction, the user can still perform the optical zoom operation. However, due to the side projection angle at this time, the original keystone adjusted rectangle will gradually become a trapezoid after optical zooming.

For the above problems, no effective solution has been proposed yet.

SUMMARY OF THE INVENTION

The embodiments of the present application provide a method and device for determining target coordinates, so as to at least solve the technical problem that, due to the existence of a side projection angle, performing optical zooming after keystone correction will cause the rectangle that has been adjusted by keystone correction to become trapezoid again. .

According to an aspect of the embodiments of the present application, a method for determining target coordinates is provided, including: determining a first distance between a first predetermined position of a first projection area and an equivalent optical zoom reference point, wherein according to the initial optical zoom The reference point and the first mapping relationship determine an equivalent optical zoom reference point, the first projection area is the projection image after zooming in the second projection area, and the optical zoom reference point is a preset in the projection plane for zooming the projection image The reference point for processing; determine the second distance between the second predetermined position of the second projection area and the equivalent optical zoom reference point; determine the ratio of the first distance to the second distance, and determine the equivalent optical zoom reference point and the first distance according to the ratio. The position of the target point between the two predetermined positions; the second mapping relationship is determined according to the position of the target point and the first predetermined position; the target coordinates are obtained according to the coordinates of the second predetermined position and the second mapping relationship, wherein the target coordinates are the projection device Projection coordinates to set when projecting.

Optionally, the first mapping relationship is determined in the following manner: acquiring the second predetermined position coordinates corresponding to the second projection area, where the second projection area is a projection image that has been keystone-corrected in the third projection area; acquiring the third projection area The corresponding third predetermined position coordinates, wherein, the third projection area is the largest projection screen; determine the first homography transformation matrix according to the third predetermined position coordinates and the second predetermined position coordinates, and use the first homography transformation matrix as the first homography transformation matrix. a mapping relationship.

Optionally, determining the equivalent optical zoom reference point according to the initial optical zoom reference point and the first mapping relationship includes: determining the initial coordinates corresponding to the initial optical zoom reference point; performing a homography on the initial coordinates based on the first homography transformation matrix to obtain the equivalent optical scaling reference point.

Optionally, before determining the first distance between the first predetermined position of the first projection area and the equivalent optical zoom reference point, the method further includes: acquiring a fourth predetermined position coordinate corresponding to the fourth projection area, wherein the fourth projection The area is the projection image after scaling of the third projection area; the first predetermined position is determined according to the fourth predetermined position coordinate and the first homography transformation matrix.

Optionally, determining the second mapping relationship according to the position of the target point and the first predetermined position, including: determining the target coordinates at the position of the target point and the first coordinates at the first predetermined position; according to the target coordinates and the first coordinates Obtain the second homography transformation matrix; use the second homography transformation matrix as the second mapping relationship.

Optionally, obtaining the target coordinates according to the second predetermined position coordinates and the second mapping relationship includes: performing a matrix multiplication operation on the second predetermined position coordinates and the second homography transformation matrix to obtain the target coordinates.

Optionally, determining the position of the target point between the equivalent optical zooming reference point and the second predetermined position according to the ratio includes: determining the target connecting line between the equivalent optical zooming reference point and the second predetermined position; determining according to the ratio The position of the target point on the target line.

Optionally, there is a one-to-one correspondence between the first predetermined position and the second predetermined position, and there are multiple first predetermined positions and second predetermined positions, and determining the ratio of the first distance to the second distance includes: from the determined The largest ratio is selected from the plurality of ratios, and the position of the target point on the target connection line is determined based on the largest ratio.

Optionally, determining the position of the target point on the target connection line based on the maximum ratio includes: multiplying the maximum ratio by the second distance to obtain a third distance; taking the equivalent scaling center as the center of the circle, and drawing the third distance as the radius. Circle, determine the circular motion trajectory; determine the intersection of the circular motion trajectory and the target line; take the coordinates corresponding to the intersection as the position of the target point.

According to another aspect of the embodiments of the present application, an apparatus for determining target coordinates is further provided, including: a first determination module configured to determine the first predetermined position of the first projection area and the first predetermined position of the first projection area and the equivalent optical zoom reference point. A distance, wherein the equivalent optical zoom reference point is determined according to the initial optical zoom reference point and the first mapping relationship, the first projection area is the projection image after zooming in the second projection area, and the optical zoom reference point is preset in the projection plane a predetermined reference point for zooming the projection image; a second determination module for determining a second distance between the second predetermined position of the second projection area and the equivalent optical zoom reference point; a third determination module for using In determining the ratio of the first distance and the second distance, the position of the target point between the equivalent optical zoom reference point and the second predetermined position is determined according to the ratio; the fourth determination module is used for determining the position of the target point according to the first predetermined position, to determine the second mapping relationship; and a fifth determining module, configured to obtain target coordinates according to the second predetermined position coordinates and the second mapping relationship, wherein the target coordinates are the projection coordinates set when the projection device performs projection.

According to another aspect of the embodiments of the present application, a non-volatile storage medium is also provided, where the non-volatile storage medium includes a stored program, wherein when the program runs, the device where the non-volatile storage medium is located is controlled to execute any arbitrary program. A method of determining the coordinates of a target.

According to another aspect of the embodiments of the present application, a processor is also provided, and the processor is configured to run a program, wherein, when the program runs, any method for determining target coordinates is executed.

In the embodiment of the present application, the method of determining the projection area based on the equivalent optical zoom reference point is adopted, and the first distance between the first predetermined position of the first projection area and the equivalent optical zoom reference point is determined, wherein according to the initial optical zoom The zooming reference point and the first mapping relationship determine an equivalent optical zooming reference point, and the first projection area is the projected image after zooming in the second projection area; determining the distance between the second predetermined position of the second projection area and the equivalent optical zooming reference point the second distance; determine the ratio of the first distance to the second distance, and determine the position of the target point between the equivalent optical zoom reference point and the second predetermined position according to the ratio; determine the position of the target point according to the position of the target point and the first predetermined position Two mapping relationships; the target coordinates are obtained according to the second predetermined position coordinates and the second mapping relationship, wherein the target coordinates are the projection coordinates set when the projection device performs projection, which achieves the maximum projection area based on the before and after scaling and the trapezoidal correction before and after scaling. to determine the technical effect of the projection coordinates, thereby solving the technical problem that optical zooming after keystone correction will cause the rectangle that has been adjusted by keystone correction to become trapezoid again due to the existence of a side projection angle.

Description of drawings

The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The schematic embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation of the present application. In the attached image:

1 is a schematic diagram of the coordinate position in an optional projection space of the present application;

2 is a schematic diagram of a projection area in an optional physical world of the application;

3 is a schematic flowchart of a method for determining target coordinates according to an embodiment of the present application;

FIG. 4 is a schematic diagram of coordinate positions in an optional projection space of the present application;

FIG. 5 is a schematic diagram of the movement trajectory of the corresponding projection image during the optical zooming process of an optional typical optical zoom lens according to an embodiment of the present application;

6 is a schematic diagram of a corresponding relationship between an optional optical zoom position and a screen zoom ratio according to an embodiment of the present application;

FIG. 7 is a schematic diagram of coordinate positions in another optional projection space of the present application;

FIG. 8 is a schematic structural diagram of an apparatus for determining target coordinates according to an embodiment of the present application.

Detailed ways

In order to make those skilled in the art better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only The embodiments are part of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the scope of protection of the present application.

It should be noted that the terms "first", "second", etc. in the description and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It is to be understood that data so used may be interchanged under appropriate circumstances so that the embodiments of the application described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

According to an embodiment of the present application, an embodiment of a method for determining target coordinates is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings may be executed in a computer system such as a set of computer-executable instructions, and, Although a logical order is shown in the flowcharts, in some cases steps shown or described may be performed in an order different from that herein.

For those skilled in the art to better understand the relevant embodiments of the present application, the trapezoidal problem caused by optical zooming will now be described:

1 is a schematic diagram of coordinate positions in an optional projection space of the present application. It should be noted that the projection space is a virtual projection screen of a projection device. It can be understood that the virtual projection screen can be the projection device in the physical space. The fitting picture corresponding to the actual projected picture is shown in Figure 1, where area A is the coordinate area of the complete picture before optical zooming, and area C is adjusted to ensure that the picture is square in the physical world under a certain side projection angle Keystone correction coordinate area value, area B is the complete screen area after optical zooming to a certain position, area D is the corresponding keystone correction coordinate area after optical zooming and zooming in area C, FIG. 2 is an optional A schematic diagram of the projection area in the physical world, as shown in Figure 2, the corresponding projection areas Cw and Dw of area C and area D in the physical space, where area C has been adjusted to a square screen before zooming, and after zooming by optical zoom , due to the existence of the projection angle, the same pixel area is imaged at different distances with inconsistent sizes, resulting in the area Dw is no longer a rectangle after scaling. That is, due to the existence of a side projection angle, optical zooming after keystone correction will cause the rectangle that has been adjusted by keystone correction to become a trapezoid again.

Therefore, the present application proposes a method for determining target coordinates. FIG. 3 shows a method for determining target coordinates according to an embodiment of the present application. As shown in FIG. 3 , the method includes the following steps:

Step S102, determining the first distance between the first predetermined position of the first projection area and the equivalent optical zooming reference point, wherein the equivalent optical zooming reference point is determined according to the initial optical zooming reference point and the first mapping relationship, and the first projection The area is the zoomed projection image of the second projection area, and the optical zoom reference point is a preset reference point in the projection plane for zooming the projection image;

Step S104, determining the second distance between the second predetermined position of the second projection area and the equivalent optical zoom reference point;

Step S106, determining the ratio of the first distance to the second distance, and determining the position of the target point between the equivalent optical zoom reference point and the second predetermined position according to the ratio;

Step S108, determining a second mapping relationship according to the position of the target point and the first predetermined position;

Step S110, obtaining target coordinates according to the second predetermined position coordinates and the second mapping relationship, wherein the target coordinates are the projection coordinates set when the projection device performs projection.

In the method for determining target coordinates, the first distance between the first predetermined position of the first projection area and the equivalent optical zoom reference point is determined. It should be noted that the determination is based on the initial optical zoom reference point and the first mapping relationship, etc. The first projection area is the zoomed projection image of the second projection area, and the optical zoom reference point is a preset reference point in the projection plane for zooming the projection image; then determine the second The second distance between the second predetermined position of the projection area and the equivalent optical zoom reference point; then, the ratio of the first distance to the second distance is determined, and the distance between the equivalent optical zoom reference point and the second predetermined position is determined according to the ratio. the position of the target point; then determine the second mapping relationship according to the position of the target point and the first predetermined position; finally obtain the target coordinates according to the second predetermined position coordinates and the second mapping relationship, wherein the target coordinates are set when the projection device performs projection The technical effect of determining the projection coordinates is based on the maximum projection area before and after scaling and the maximum projection area after keystone correction before and after scaling, and then solves the problem that due to the existence of a side projection angle, optical scaling after keystone correction will cause The technical problem that the rectangle that has been adjusted by keystone correction will become a trapezoid.

It should be noted that after the virtual projection screen is obtained by simulation, the coordinate range of the area before and after the zoom can be determined according to the zoom ratio. FIG. 4 is a schematic diagram of the coordinate position in an optional projection space of the present application. As shown in FIG. A is the coordinate area of the complete picture before optical zooming, area C is the keystone correction coordinate area value adjusted to ensure that the picture is square in the physical world under a certain side projection angle, and area B is the area after the optical zoom is zoomed to a certain position The complete screen area of area, area D is the corresponding keystone correction coordinate area of area C after optical zooming and zooming, where point o is the initial optical zooming reference point, and point o1 is the equivalent optical zooming reference point.

FIG. 5 shows the movement trajectory of an optional typical optical zoom lens corresponding to the projection image during the optical zooming process according to the embodiment of the present application. It should be noted that the optical zoom center (ie, the optical zoom reference point) shown in the figure is the center of the optical zoom. It can be anywhere within the frame, or even outside the frame, depending on the specific optical design.

6 is a schematic diagram of an optional corresponding relationship between the optical zoom position and the screen zoom ratio according to an embodiment of the present application. After the optical zoom position is moved, the zoom of four points on the screen relative to the optical zoom center (optical zoom reference point, optical center for short) is zoomed The scale is linearly scaled according to the same ratio, which can be expressed by the linear relationship r=kb+c as shown in the figure below, where r represents the current corner of the screen (upper left, The ratio between the distance from the upper right, lower left, and lower right four corners) to the optical center and the distance oT1 from the corresponding vertex under the largest screen to the optical center; for example, at the position b2 of the maximum throw ratio (the point in the upper right corner of the screen is T2 at this time), then this When r=oT2/oT1, where oT1 is the distance from the optical center o to the corner of T1 in the above figure, oT2 is the distance from the optical center o to the corner of T2 in the above figure, k, c are the curve parameters, and b is the current zoom position . It should be noted that if the distance relationship between the four corner points and the optical zoom center is inconsistent, it is necessary to fit four curves to characterize the screen position, and the fitted curves include but are not limited to the linear relationship shown in the figure, as shown in Figure 4. The area A and area B before and after zooming correspond to the optical zoom positions b1 and b3 in Fig. 6, respectively, then the corresponding distance ratios of area A and area B can be obtained as r1=kb1+c and r3=kb2+c; then calculate respectively Optical zoom reference point o to the initial maximum screen (when the projection ratio is the smallest, it corresponds to the largest area of the screen. It should be noted that the figure shows the case where the area A before zooming is just the largest screen area. When the screen before zooming is not the largest screen, the same The corresponding coordinates under the ratio of the corresponding corner points of the largest picture as a reference), for example, when the length ratio of r1 is 1, the length of the upper left corner point is r1*oA, so that the upper left corner is point A, and the pictures B, C, and C before scaling can also be obtained. Point D, and the scaled ratio is r3, then the length of the upper left corner oa=r3*oA to get point a, similar to points b, c, and d according to the scale. As a result, the zoomed image area A (rectangle ABCD) and the zoomed image area B (rectangle abcd) can be obtained respectively. It can be understood that for the case where the image is enlarged, the processing method is similar, but it is equivalent to changing the image from area B to area B. area A).

It should be noted that the above-mentioned projection area may be the actual projection area of the projection device in the physical space, or may be the virtual projection area of the projection device itself corresponding to the actual projection area of the physical space, and the first mapping may be determined in the following manner: Relation: Obtain the second predetermined position coordinates corresponding to the second projection area, where the second projection area is a projection image that has been keystone-corrected in the third projection area; obtain the third predetermined position coordinates corresponding to the third projection area, where the first The three projection areas are the largest projection images; the first homography transformation matrix is determined according to the third predetermined position coordinates and the second predetermined position coordinates, and the first homography transformation matrix is used as the first mapping relationship.

In some optional embodiments of the present application, the equivalent optical zoom reference point may be determined according to the initial optical zoom reference point and the first mapping relationship, and specifically, the initial coordinates corresponding to the initial optical zoom reference point are determined; based on the first homography The transformation matrix performs homography transformation on the initial coordinates to obtain the equivalent optical scaling reference point.

It can be understood that before determining the first distance between the first predetermined position of the first projection area and the equivalent optical zoom reference point, the coordinates of the fourth predetermined position corresponding to the fourth projection area can be obtained. The area is the projection image after scaling of the third projection area, and finally, the first predetermined position is determined according to the fourth predetermined position coordinates and the first homography transformation matrix.

In some embodiments of the present application, the second mapping relationship may be determined according to the position of the target point and the first predetermined position, specifically, the target coordinates at the position of the target point and the first coordinates at the first predetermined position are determined; and according to A second homography transformation matrix is obtained from the target coordinates and the first coordinates, and then the second homography transformation matrix is used as the second mapping relationship.

In some embodiments of the present application, the target coordinates can be obtained according to the second predetermined position coordinates and the second mapping relationship. Specifically, matrix multiplication is performed on the second predetermined position coordinates and the second homography transformation matrix to obtain the target coordinates.

It can be understood that the position of the target point between the equivalent optical zoom reference point and the second predetermined position can be determined according to the ratio, and specifically, the target connection line between the equivalent optical zoom reference point and the second predetermined position is determined; The ratio determines the position of the target point on the target line.

It should be noted that there is a one-to-one correspondence between the first predetermined position and the second predetermined position. For example, if the first predetermined position is the upper left corner position in the first projection area, it corresponds to the upper left corner position in the second projection area. Obviously , there are multiple first predetermined positions and second predetermined positions, for example, the upper left corner position, the lower left corner position, the upper right corner position and the lower right corner position of the first projection area, and, for example, the upper left corner position of the second projection area , the lower left corner position, the lower right corner position and the lower right corner position. Therefore, when determining the ratio of the first distance to the second distance, the maximum ratio can be selected from the determined multiple ratios, and the maximum ratio can be determined on the target connection line based on the maximum ratio. The location of the target point.

In some embodiments of the present application, the position of the target point on the target connection line may be determined based on the maximum ratio. Specifically, the maximum ratio is multiplied by the second distance to obtain the third distance. The equivalent scaling center is the center of the circle, and the third distance is the center of the circle. Draw a circle with three distances as the radius, determine the circular motion trajectory, determine the intersection point between the circular motion trajectory and the target line, and take the coordinates corresponding to the intersection point as the position of the target point.

In order to facilitate those skilled in the art to better understand the relevant embodiments of the present application, FIG. 7 is a schematic diagram of another optional coordinate position in the projection space of the present application. Now, the relevant embodiments of the present application will be described with reference to FIG. 7 , as shown in FIG. 7 . As shown, the homography transformation matrix H1 (the first mapping relationship) from the region A (the third projection region) to the region C (the second projection region) can be calculated. It should be noted that the region C (the second projection region) is for the purpose of The keystone correction coordinate area adjusted to ensure that the screen is square in the physical world under a certain side projection angle, the specific calculation process can be as follows: determine the coordinates of the four corner points of the area C (second projection area), and the area A ( The coordinates of the four corners of the third projection area), and then use the direct linear transformation method Direct Linear Transformation (DLT for short) to solve to obtain the homography transformation matrix H1, after obtaining the homography transformation matrix H1, the initial optical transformation can be The coordinates of point o of the scaling reference point are obtained, and the coordinates of point o1 of the equivalent optical scaling reference point are obtained by performing homography transformation based on the homography transformation matrix H1.

Further, four new coordinate points obtained by performing homography transformation on the four-point coordinates of the region B (abcd, the fourth projection region) according to the homography transformation matrix H1 (first mapping relationship) obtained in the previous step, That is, the four-point coordinates of the area D (efgh, the first projection area); then connect the equivalent optical zoom reference point o1 to the four points of the area C (EFGH, the second projection area), and calculate the line segments o1-e and o1-E Ratio: o1-e/o1-E, similarly, calculate o1-f/o1-F, o1-g/o1-G, o1-h/o1-H to obtain four ratios, preferably, take four ratios The maximum value in , assuming that the maximum ratio is o1-g/o1-G at this time, denoted as max Ratio; then further calculate the intersection between o1 and the four corners of area C according to the max Ratio obtained in the previous step. Position, that is, o1-G*max Ratio to get g1 point (as shown by the small circle in the figure), in the same way, e1 point (o1-E*max Ratio), f1 point (o1-F*max Ratio), h1 Point (o1-H*max Ratio); Next, calculate the homography transformation matrix H2 (second mapping relationship) from the four points of efgh to the four points of e1f1g1h1, and finally adjust the coordinates of the four points to the initial trapezoidal correction four-point coordinate value* H2 (second predetermined position coordinates * second mapping relationship), the new four-point coordinates obtained are the target coordinates. It is easy to notice that the initial trapezoidal correction four-point coordinate value is the C area (EFGH, the second projection area) The coordinate values corresponding to the four corner points.

FIG. 8 is an apparatus for determining target coordinates according to an embodiment of the present application. As shown in FIG. 8 , the apparatus includes:

The first determination module 40 is configured to determine the first distance between the first predetermined position of the first projection area and the equivalent optical zoom reference point, wherein the equivalent optical zoom reference is determined according to the initial optical zoom reference point and the first mapping relationship point, the first projection area is the zoomed projection image of the second projection area, and the optical zoom reference point is a preset reference point in the projection plane for zooming the projection image;

The second determination module 42 is configured to determine the second distance between the second predetermined position of the second projection area and the equivalent optical zoom reference point;

The third determination module 44 is configured to determine the ratio of the first distance to the second distance, and determine the position of the target point between the equivalent optical zoom reference point and the second predetermined position according to the ratio;

The fourth determination module 46 is used to determine the second mapping relationship according to the position of the target point and the first predetermined position;

The fifth determination module 48 is configured to obtain target coordinates according to the second predetermined position coordinates and the second mapping relationship, wherein the target coordinates are the projection coordinates set when the projection device performs projection.

In the apparatus for determining target coordinates, a first determination module 40 is configured to determine a first distance between a first predetermined position of the first projection area and an equivalent optical zoom reference point, wherein the first optical zoom reference point and the first The mapping relationship determines an equivalent optical zoom reference point, the first projection area is the zoomed projection image of the second projection area, and the optical zoom reference point is a preset reference point in the projection plane for zooming the projection image; The second determination module 42 is used to determine the second distance between the second predetermined position of the second projection area and the equivalent optical zoom reference point; the third determination module 44 is used to determine the ratio of the first distance to the second distance, The position of the target point between the equivalent optical zoom reference point and the second predetermined position is determined according to the ratio; the fourth determination module 46 is configured to determine the second mapping relationship according to the position of the target point and the first predetermined position; the fifth determination The module 48 is used to obtain the target coordinates according to the second predetermined position coordinates and the second mapping relationship, wherein the target coordinates are the projection coordinates set when the projection device performs projection, which achieves the maximum projection area based on the before and after scaling and the trapezoidal correction before and after scaling. The maximum projection area that has been passed, determines the technical effect of the projection coordinates, and then solves the technical problem that due to the existence of a side projection angle, optical zooming after keystone correction will cause the rectangle that has been adjusted by keystone correction to become a trapezoid.

Specifically, the above-mentioned storage medium is used to store program instructions for executing the following functions, and realize the following functions: determining the first distance between the first predetermined position of the first projection area and the equivalent optical zoom reference point, wherein, according to the initial optical zoom reference The point and the first mapping relationship determine an equivalent optical zoom reference point, the first projection area is the projection image after zooming in the second projection area, and the optical zoom reference point is a preset in the projection plane for zooming the projection image determine the second distance between the second predetermined position of the second projection area and the equivalent optical zoom reference point; determine the ratio of the first distance to the second distance, and determine the equivalent optical zoom reference point and the second The position of the target point between the predetermined positions; the second mapping relationship is determined according to the position of the target point and the first predetermined position; the target coordinates are obtained according to the coordinates of the second predetermined position and the second mapping relationship, wherein the target coordinates are performed by the projection device. Projection coordinates to set when projecting.

Specifically, the above-mentioned processor is used to call the program instructions in the memory, and realize the following function: determine the first distance between the first predetermined position of the first projection area and the equivalent optical zoom reference point, wherein, according to the initial optical zoom reference point and The first mapping relationship determines an equivalent optical zoom reference point, the first projection area is the projection image after zooming in the second projection area, and the optical zoom reference point is a preset reference in the projection plane for zooming the projection image point; determine the second distance between the second predetermined position of the second projection area and the equivalent optical zoom reference point; determine the ratio of the first distance to the second distance, and determine the equivalent optical zoom reference point and the second predetermined position according to the ratio According to the position of the target point and the first predetermined position, the second mapping relationship is determined; the target coordinates are obtained according to the second predetermined position coordinates and the second mapping relationship, wherein the target coordinates are when the projection device projects Set projected coordinates.

The above-mentioned serial numbers of the embodiments of the present application are only for description, and do not represent the advantages or disadvantages of the embodiments.

In the above-mentioned embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are only illustrative, for example, the division of the units may be a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components may be combined or Integration into another system, or some features can be ignored, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of units or modules, and may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and components shown as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated unit, if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes .

The above are only the preferred embodiments of the present application. It should be pointed out that for those skilled in the art, without departing from the principles of the present application, several improvements and modifications can also be made. It should be regarded as the protection scope of this application.

Claims

A method for determining target coordinates, comprising:

determining a first distance between a first predetermined position of the first projection area and an equivalent optical zoom reference point, wherein the equivalent optical zoom reference point is determined according to an initial optical zoom reference point and a first mapping relationship, and the first The projection area is the projection image after zooming in the second projection area, and the optical zoom reference point is a preset reference point in the projection plane for performing zoom processing on the projection image;

determining a second distance between the second predetermined position of the second projection area and the equivalent optical zoom reference point;

determining a ratio of the first distance to the second distance, and determining a position of a target point between the equivalent optical zoom reference point and a second predetermined position according to the ratio;

determining a second mapping relationship according to the position of the target point and the first predetermined position;

Target coordinates are obtained according to the second predetermined position coordinates and the second mapping relationship, wherein the target coordinates are projection coordinates set when the projection device performs projection.
The method according to claim 1, wherein the first mapping relationship is determined in the following manner:

acquiring a second predetermined position coordinate corresponding to a second projection area, wherein the second projection area is a projection image obtained by performing keystone correction in the third projection area;

acquiring a third predetermined position coordinate corresponding to the third projection area, wherein the third projection area is the largest projection image;

A first homography transformation matrix is determined according to the third predetermined position coordinates and the second predetermined position coordinates, and the first homography transformation matrix is used as the first mapping relationship.
The method according to claim 2, wherein determining the equivalent optical zoom reference point according to the initial optical zoom reference point and the first mapping relationship comprises:

determining the initial coordinates corresponding to the initial optical zoom reference point;

Perform homography transformation on the initial coordinates based on the first homography transformation matrix to obtain the equivalent optical scaling reference point.
The method according to claim 3, wherein before determining the first distance between the first predetermined position of the first projection area and the equivalent optical zoom reference point, the method further comprises:

acquiring a fourth predetermined position coordinate corresponding to a fourth projection area, wherein the fourth projection area is a scaled projection image of the third projection area;

The first predetermined position is determined according to the fourth predetermined position coordinates and the first homography transformation matrix.
The method according to claim 1, wherein determining the second mapping relationship according to the position of the target point and the first predetermined position, comprising:

determining the target coordinates at the position of the target point and the first coordinates at the first predetermined position;

Obtain a second homography transformation matrix according to the target coordinates and the first coordinates;

The second homography transformation matrix is used as the second mapping relationship.
The method according to claim 5, wherein obtaining target coordinates according to the second predetermined position coordinates and the second mapping relationship comprises:

Perform matrix multiplication operation on the second predetermined position coordinates and the second homography transformation matrix to obtain the target coordinates.
The method according to claim 1, wherein determining the position of the target point between the equivalent optical zoom reference point and the second predetermined position according to the ratio comprises:

determining a target connection line between the equivalent optical zoom reference point and the second predetermined position;

The position of the target point on the target line is determined according to the ratio.
The method according to claim 7, wherein there is a one-to-one correspondence between the first predetermined position and the second predetermined position, and both the first predetermined position and the second predetermined position have a plurality of , determine the ratio of the first distance to the second distance, including:

A maximum ratio is selected from the determined plurality of ratios, and the position of the target point on the target link is determined based on the maximum ratio.
The method according to claim 8, wherein determining the position of the target point on the target connection line based on the maximum ratio comprises:

multiplying the maximum ratio by the second distance to obtain a third distance;

Draw a circle with the equivalent zoom center as the center and the third distance as the radius to determine a circular motion trajectory;

Determine the intersection of the circular motion trajectory and the target line;

The coordinates corresponding to the intersection point are used as the position of the target point.
A device for determining target coordinates, comprising:

a first determination module, configured to determine a first distance between the first predetermined position of the first projection area and an equivalent optical zoom reference point, wherein the equivalent optical zoom is determined according to the initial optical zoom reference point and the first mapping relationship A reference point, the first projection area is the projection image scaled by the second projection area, and the optical zoom reference point is a preset reference point in the projection plane for zooming the projection image ;

a second determining module, configured to determine a second distance between the second predetermined position of the second projection area and the equivalent optical zoom reference point;

a third determining module, configured to determine the ratio of the first distance to the second distance, and determine the position of the target point between the equivalent optical zoom reference point and the second predetermined position according to the ratio;

a fourth determining module, configured to determine a second mapping relationship according to the position of the target point and the first predetermined position;

The fifth determination module is configured to obtain target coordinates according to the second predetermined position coordinates and the second mapping relationship, wherein the target coordinates are projection coordinates set when the projection device performs projection.
A non-volatile storage medium, characterized in that the non-volatile storage medium includes a stored program, wherein when the program runs, the device where the non-volatile storage medium is located is controlled to execute claims 1 to 1. The method for determining target coordinates according to any one of 9.
A processor, characterized in that the processor is used to run a program, wherein when the program runs, the method for determining target coordinates according to any one of claims 1 to 9 is executed.