CN111970500A - Automatic distance step calibration method and system for projection equipment - Google Patents
Automatic distance step calibration method and system for projection equipment Download PDFInfo
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- CN111970500A CN111970500A CN202010812677.0A CN202010812677A CN111970500A CN 111970500 A CN111970500 A CN 111970500A CN 202010812677 A CN202010812677 A CN 202010812677A CN 111970500 A CN111970500 A CN 111970500A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/317—Convergence or focusing systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3191—Testing thereof
Abstract
The invention discloses an automatic distance and step calibration method and system for projection equipment, and relates to the field of projectors. The method comprises the following steps: measuring a projection distance between the projection equipment and the projection picture; focusing the projection picture, and sequentially recording the definition of the projection picture and the corresponding step number of the motor; determining the target motor step number corresponding to the maximum definition according to all the obtained definitions, and associating the target motor step number with the projection distance to obtain a distance step mapping relation; and adjusting the position of the projection equipment until a distance-step mapping relation of N projection distances is obtained, and generating a distance-step mapping model according to the distance-step mapping relation of the N projection distances. The invention has the advantages of high automatic focusing speed and high focusing precision, improves the operability of step-by-step calibration, and provides a basic guarantee for realizing the function of quick automatic focusing, thereby automatically detecting and intercepting unqualified products in the production stage of projection equipment and improving the product quality.
Description
Technical Field
The invention relates to the field of projectors, in particular to an automatic distance and step calibration method and system for projection equipment.
Background
For a projector, since the distance step calibration is not performed before the projector leaves the factory, when the auto-focusing is performed, the auto-focusing speed is slow and the focusing efficiency is low because the relationship between the projection distance and the focusing motor is uncertain.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automatic distance step calibration method and system for projection equipment aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows:
an automatic pitch calibration method for a projection device, comprising:
s1, projecting the image to the imaging area through the projection equipment, and measuring the projection distance between the projection equipment and the projection picture;
s2, focusing the projection picture through a focusing motor of the projection equipment according to a preset step interval, and sequentially recording the definition of the projection picture and the corresponding step number of the motor;
s3, determining the step number of the target motor corresponding to the maximum definition according to all the obtained definitions, and associating the step number of the target motor with the projection distance to obtain a distance step mapping relation;
and S4, adjusting the position of the projection equipment, repeating the steps S1 to S3 until obtaining the distance-step mapping relation of N projection distances, and generating a distance-step mapping model according to the distance-step mapping relation of the N projection distances, wherein N is larger than or equal to 1.
Another technical solution of the present invention for solving the above technical problems is as follows:
an automatic step calibration system for a projection device, comprising:
the distance measuring device is used for projecting the image to the imaging area through the projection equipment and measuring the projection distance between the projection equipment and the projection picture;
the focusing device is used for focusing the projection picture through a focusing motor of the projection equipment at intervals of preset steps, and sequentially recording the definition of the projection picture and the corresponding step number of the motor;
the processing device is used for determining the step number of the target motor corresponding to the maximum definition according to all the obtained definitions, and associating the step number of the target motor with the projection distance to obtain a distance step mapping relation;
and the moving device is used for adjusting the position of the projection equipment, repeating the steps from S1 to S3 until a distance-step mapping relation of N projection distances is obtained, and generating a distance-step mapping model according to the distance-step mapping relation of the N projection distances, wherein N is more than or equal to 1.
The invention has the beneficial effects that: according to the invention, the distance-step mapping model is established, and the corresponding relation between the projection distance and the step number of the focusing motor when the projection picture is clearest is stored in the distance-step mapping model, so that when automatic focusing is carried out, the rapid and accurate focusing can be realized only by searching the step number of the motor at the projection distance through the distance-step mapping model, and the method has the advantages of rapid focusing speed and high calibration precision, improves the operability of distance-step calibration, provides a basic guarantee for realizing the rapid automatic focusing function, and can automatically detect and intercept unqualified products in the production stage of projection equipment, and improve the product quality.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic flow chart diagram of an embodiment of an automatic pitch step calibration method according to the present invention;
FIG. 2 is a schematic flow chart of an exemplary calibration method according to another embodiment of the present invention;
FIG. 3 is a block diagram of an embodiment of an automatic step calibration system according to the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, which are set forth to illustrate, but are not to be construed to limit the scope of the invention.
As shown in fig. 1, a schematic flowchart is provided for an embodiment of an automatic step calibration method of the present invention, where the automatic step calibration method is suitable for automatic step calibration of a projection device, and includes:
s1, projecting the image to the imaging area through the projection device, and measuring the projection distance between the projection device and the projection picture;
s2, focusing the projection picture through a focusing motor of the projection equipment according to the preset step interval, and sequentially recording the definition of the projection picture and the corresponding step number of the motor;
s3, determining the target motor step number corresponding to the maximum definition according to all the obtained definitions, and associating the target motor step number with the projection distance to obtain a distance step mapping relation;
s4, adjusting the position of the projection equipment, repeating the steps S1 to S3 until obtaining the distance-step mapping relation of N projection distances, and generating a distance-step mapping model according to the distance-step mapping relation of the N projection distances, wherein N is larger than or equal to 1.
After the distance step mapping model is obtained, when automatic focusing is carried out, the focusing motor step number can be obtained through the distance step mapping model quickly only by detecting the projection distance, and therefore the automatic focusing efficiency is improved.
It should be noted that the distance-to-step mapping model stores the correspondence between the projection distance and the number of steps of the focus motor, and converts the physical distance between the projection apparatus and the imaging area into the number of steps of the motor when the focus is clear, as shown in table 1, an exemplary distance-to-step mapping model is given.
TABLE 1
It should be appreciated that focus motors on projection devices such as projectors have a fixed total stroke, for example 800. The projection distance of the projector and the motor stroke form a certain proportional relation, when the projection distance is increased or decreased, the motor step number when the projection picture is clear is increased or decreased, then the definition of the projection picture is automatically and gradually adjusted according to the actual projection distance of different positions by combining the step mapping model shown in the table 1, and the motor step number at the moment is recorded after the clearest picture is confirmed, so that the mapping relation between the distance and the motor step number is obtained.
For example, after measuring the physical distance between the projection apparatus and the imaging area, the step number of the focus motor may be determined by looking up table 1, for example, assuming that the physical distance is 1, the step number of the focus motor may be adjusted to 100 steps.
Specifically, the preset step interval may be set according to actual requirements, may be adjusted in time according to time and focusing effect, and may be, for example, 30 steps from the minimum step of the tuning motor until the maximum stroke of the tuning motor is tuned.
According to the embodiment, the distance-step mapping model is established, the corresponding relation between the projection distance and the step number of the focusing motor when the projection picture is clearest is stored in the distance-step mapping model, therefore, when automatic focusing is carried out, the rapid focusing can be realized only by searching the motor step number of the projection distance through the distance-step mapping model, the advantages of high focusing speed and high calibration precision are achieved, the operability of distance-step calibration is improved, a basic guarantee is provided for realizing the rapid automatic focusing function, unqualified products can be automatically detected and intercepted in the production stage of the projection equipment, and the product quality is improved.
Optionally, in some possible embodiments, sequentially recording the sharpness of the projection picture specifically includes:
the image of the projection picture is shot through the image pickup device, and the definition of the projection picture is determined through a gray variance evaluation method.
The definition of a projection picture can be rapidly determined by a gray variance evaluation method, and the calibration efficiency is improved.
Alternatively, the sharpness of the projected picture may also be described by a Brenner gradient function, a Laplacian gradient function, or the like.
Optionally, in some possible embodiments, determining the definition of the projection picture by a gray variance evaluation method specifically includes:
carrying out graying processing on the picture of the projection picture to obtain a grayscale picture;
detecting the gray level difference value of a black pixel and an adjacent pixel at the edge of a projection picture in a gray level picture;
and determining the definition of the projection picture according to the gray difference value.
It should be understood that the gray scale refers to representing an object by using black as a reference color, each gray scale object has a gray scale value of 0% -100%, and for the same black-and-white image, a clear image can be captured to show a clear edge line of each object, in this case, the black pixels occupied by the edges of the object are fewer, and the black pixels occupied by the edges of the object in the captured blurred image are relatively more. Therefore, the gray difference between the black pixel at the edge of the object in the clear picture and the adjacent pixel is larger, and the difference can be represented by the variance calculation.
That is, the larger the variance of the gray value is, the clearer the object edge lines of the photographed picture are, and the clearer the picture is, by comparing the variance of the gray value in the motor stroke, the motor step number corresponding to the maximum variance is the clearer motor step number, and corresponds to the clearest projection picture.
If, assuming a physical throw distance of 1m, it is possible to perform a motor run for a complete stroke first, calculate the sharpness, assuming that a picture is taken every 30 steps of the motor, and record: definition-number of steps.
After the whole motor stroke is finished, a group of definition values and corresponding motor steps are obtained, then the motor steps corresponding to the maximum definition value are extracted from the group of data, a corresponding relation with the physical distance is formed according to the motor steps corresponding to the maximum definition value, a mapping relation is formed, and the calibration process of the distance is finished.
The definition of the projection picture is determined by the method, the method has the advantages of simple process, high identification efficiency and high identification precision, and can be realized in the industry, thereby intercepting unqualified products in a production line and improving the product quality.
Optionally, in some possible embodiments, the method further includes:
and performing automatic focusing by using the distance step mapping model.
The automatic focusing is carried out through the distance step mapping model, the automatic focusing method has the advantage of high focusing speed, automatic focusing can be achieved after the projection distance is obtained through measurement, the focusing speed and precision are improved, and the user experience is improved.
Optionally, in some possible embodiments, the performing auto-focusing by using the distance step mapping model specifically includes:
determining a first projection distance of a projection device to be calibrated;
searching a first motor step number corresponding to the first projection distance from the step mapping model;
and adjusting the step number of a focusing motor of the projection equipment to be calibrated according to the step number of the first motor.
The automatic calibration is carried out through the pre-established distance and step mapping model, the method has the advantages of high calibration speed and high calibration precision, and the distance and step mapping model can be stored in a storage medium, so that the method is convenient to move and execute.
As shown in fig. 2, a flowchart of an example of distance-step calibration is provided, the distance determination is realized by controlling a motor to adjust the image definition, collecting images by a camera, and TOF, and the three modules realize the motor step number collection of the clearest image at a specific distance, that is, distance-step calibration, and the specific logic process is described as follows with reference to fig. 2.
First, the test distance, the number of tests, and a consistency threshold, which may be the maximum difference in the number of motor steps between the results of multiple tests, are input to the calibration device.
Then, the TOF module is controlled to judge the actual distance, and the calibration data of the TOF module is read: if the data is null or invalid, indicating that no calibration is available, and stopping the test; and if the valid data are read, calling the ranging function of the TOF module, and reading the measurement result.
Comparing the input test distance with the measurement result: stopping the test when the threshold range is exceeded; within the threshold, the machine position is correct, and subsequent tests can be continued.
Secondly, control camera and motor carry out the adjustment of picture definition, confirm through the camera module that the camera function is normal: stopping testing when the camera functions abnormally; and (5) the camera functions normally, and the motor function test is continued.
Confirming whether the motor functions normally through the motor module: stopping testing when the motor is abnormal; the motor functions normally and the following tests were continued.
The camera cooperates with the motor to find the clearest points:
1. the reset motor reaches 0 point
2. Controlling the motor module to rotate to a specific number of steps
3. Opening the camera and collecting the projection picture of the DUT
4. Calculating picture gray value and correlating with motor step number
5. Repeating the steps 2-4, collecting the curve of the gray value and the step number of the motor until the step number of the motor reaches the maximum
6. Analyzing the curve to find out the point with optimal gray value
7. Number of motor steps to output optimum point
Finally, according to the input test times, the process is repeatedly executed, the step number of the motor output each time is recorded, the step number of the motor obtained by multiple tests is analyzed with the input consistency threshold, if the step number exceeds the threshold, the test process is possibly interfered, and the test is stopped; and in the threshold range, the test is passed, and the test distance-step number is recorded to finish the calibration.
It is to be understood that some or all of the various embodiments described above may be included in some embodiments.
As shown in fig. 3, a structural framework diagram is provided for an embodiment of the automatic step calibration system of the present invention, which is suitable for automatic step calibration of a projection device, and includes:
the distance measuring device 1 is used for projecting the projection equipment to the imaging area and measuring the projection distance between the projection equipment and the projection picture;
the focusing device 2 is used for focusing the projection picture through a focusing motor of the projection equipment according to a preset step interval, and recording the definition of the projection picture and the corresponding step number of the motor through the camera in sequence;
the processing device 3 is used for determining the target motor step number corresponding to the maximum definition according to all the obtained definitions, and associating the target motor step number with the projection distance to obtain a distance step mapping relation;
and the moving device is used for adjusting the position of the projection equipment, repeating the steps from S1 to S3 until a distance-step mapping relation of N projection distances is obtained, and generating a distance-step mapping model according to the distance-step mapping relation of the N projection distances, wherein N is more than or equal to 1.
It should be understood that the distance measuring device may be a TOF distance measuring device, the focusing device may control the focusing motor through a focusing program inside the projector, and the moving device may be implemented through a device having a mechanical transmission function, such as a mechanical arm, a conveyor belt, etc., which are well known in the art and will not be described herein.
Alternatively, in some possible embodiments, the focusing device 2 is specifically configured to take a picture of a projection screen by an image pickup apparatus, and the definition of the projection screen is determined by a gray variance evaluation method.
Optionally, in some possible embodiments, the focusing device 2 is specifically configured to perform graying processing on a picture of the projection picture to obtain a grayscale picture; detecting the gray level difference value of a black pixel and an adjacent pixel at the edge of a projection picture in a gray level picture; and determining the definition of the projection picture according to the gray difference value.
Optionally, in some possible embodiments, the method further includes:
and the automatic focusing device is used for carrying out automatic focusing by using the distance step mapping model.
Optionally, in some possible embodiments, the autofocus device is specifically configured to determine a first projection distance of the projection apparatus to be calibrated; searching a first motor step number corresponding to the first projection distance from the step mapping model; and adjusting the step number of a focusing motor of the projection equipment to be calibrated according to the step number of the first motor.
It is to be understood that some or all of the various embodiments described above may be included in some embodiments.
It should be noted that the above embodiments are product embodiments corresponding to previous method embodiments, and for the description of the product embodiments, reference may be made to corresponding descriptions in the above method embodiments, and details are not repeated here.
The reader should understand that in the description of this specification, reference to the description of the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described method embodiments are merely illustrative, and for example, the division of steps into only one logical functional division may be implemented in practice in another way, for example, multiple steps may be combined or integrated into another step, or some features may be omitted, or not implemented.
The above method, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. An automatic pitch calibration method for a projection device, comprising:
s1, projecting the image to the imaging area through the projection equipment, and measuring the projection distance between the projection equipment and the projection picture;
s2, focusing the projection picture through a focusing motor of the projection equipment according to a preset step interval, and sequentially recording the definition of the projection picture and the corresponding step number of the motor;
s3, determining the step number of the target motor corresponding to the maximum definition according to all the obtained definitions, and associating the step number of the target motor with the projection distance to obtain a distance step mapping relation;
and S4, adjusting the position of the projection equipment, repeating the steps S1 to S3 until obtaining the distance-step mapping relation of N projection distances, and generating a distance-step mapping model according to the distance-step mapping relation of the N projection distances, wherein N is larger than or equal to 1.
2. The automatic pitch calibration method for a projection device of claim 1, wherein the recording of the sharpness of the projection images in sequence comprises:
and shooting a picture of the projection picture through an image pickup device, and determining the definition of the projection picture through a gray variance evaluation method.
3. The method according to claim 2, wherein determining the sharpness of the projection screen by a gray variance evaluation method comprises:
carrying out graying processing on the picture of the projection picture to obtain a grayscale picture;
detecting the gray level difference value of a black pixel and an adjacent pixel at the edge of the projection picture in the gray level picture;
and determining the definition of the projection picture according to the gray difference value.
4. The automatic pitch calibration method for a projection device of any of claims 1-3, further comprising:
and using the distance step mapping model for automatic focusing.
5. The method according to claim 4, wherein the auto-focusing using the step-by-step mapping model comprises:
determining a first projection distance of a projection device to be calibrated;
searching a first motor step number corresponding to the first projection distance from the step mapping model;
and adjusting the step number of a focusing motor of the projection equipment to be calibrated according to the first motor step number.
6. An automatic step calibration system for a projection device, comprising:
the distance measuring device is used for projecting the image to the imaging area through the projection equipment and measuring the projection distance between the projection equipment and the projection picture;
the focusing device is used for focusing the projection picture through a focusing motor of the projection equipment at intervals of preset steps, and sequentially recording the definition of the projection picture and the corresponding step number of the motor;
the processing device is used for determining the step number of the target motor corresponding to the maximum definition according to all the obtained definitions, and associating the step number of the target motor with the projection distance to obtain a distance step mapping relation;
and the moving device is used for adjusting the position of the projection equipment, repeating the steps from S1 to S3 until a distance-step mapping relation of N projection distances is obtained, and generating a distance-step mapping model according to the distance-step mapping relation of the N projection distances, wherein N is more than or equal to 1.
7. The system of claim 6, wherein the focusing apparatus is specifically configured to take a picture of the projection screen by an imaging device, and the sharpness of the projection screen is determined by a gray-scale variance evaluation method.
8. The system according to claim 7, wherein the focusing device is specifically configured to perform a graying process on the image of the projection screen to obtain a grayscale image; detecting the gray level difference value of a black pixel and an adjacent pixel at the edge of the projection picture in the gray level picture; and determining the definition of the projection picture according to the gray difference value.
9. The automatic step calibration system for a projection device of any of claims 6 to 8, further comprising:
and the automatic focusing device is used for carrying out automatic focusing by using the distance step mapping model.
10. The system of claim 9, wherein the autofocus apparatus is specifically configured to determine a first projection distance of the projection device to be calibrated; searching a first motor step number corresponding to the first projection distance from the step mapping model; and adjusting the step number of a focusing motor of the projection equipment to be calibrated according to the first motor step number.
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| CN112866663A (en) * | 2020-12-31 | 2021-05-28 | 深圳市火乐科技发展有限公司 | Focusing calibration method and related device |
| CN113194251A (en) * | 2021-04-28 | 2021-07-30 | 烟台艾睿光电科技有限公司 | Method, device, equipment and medium for correcting infrared thermal imaging equipment |
| CN114666558A (en) * | 2022-04-13 | 2022-06-24 | 深圳市火乐科技发展有限公司 | Method and device for detecting definition of projection picture, storage medium and projection equipment |
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