A method, system, apparatus and storage medium for focus testing a projector

Abstract

The application discloses a projector focusing test method, system, device and storage medium, wherein the projector focusing test method comprises the following steps: acquiring distance data between a projector and a screen; acquiring preset running steps of a focusing motor of the projector corresponding to the distance data according to the distance data and a preset distance-step relationship; controlling the focusing motor to run to drive a lens module of the projector to focus; acquiring initial projection definition of a projection picture projected by the projector on the screen after focusing, and judging whether the initial projection definition reaches a preset range of projection definition; if the preset range of projection definition is not reached, making the lens module of the projector focus again until the preset range of projection definition is reached, and acquiring actual running steps of the focusing motor at this time; and updating the preset distance-step relationship according to the actual running steps. The technical scheme of the application can improve the efficiency of focusing test and ensure the accuracy of focusing test.

Description

Technical Field

[0001] This invention relates to the field of projector testing technology, and specifically to a projector focus testing method, system, device, and storage medium. Background Technology

[0002] Projection products are devices that project images or videos onto a screen; they are commonly referred to as projectors. Currently, most projection products have autofocus functionality. The autofocus process involves the projector lens projecting a specific image for focusing, then a camera taking pictures of this image. After taking dozens of pictures, the projector's internal chip compares the photos and selects the clearest one as the reference image for subsequent projection. Finally, the focus motor is driven to adjust the image to match the clarity of this photograph.

[0003] However, the projector's autofocus function relies primarily on the human eye and manual methods during testing. This method is slow and can lead to insufficient accuracy and objectivity in the test. Summary of the Invention

[0004] The main objective of this invention is to propose a projector focus testing system and method, which aims to improve the efficiency of projector focus testing and ensure the accuracy of focus testing.

[0005] The above-mentioned problems to be solved by the present invention are achieved through the following technical solutions: A method for testing the focus of a projector, characterized by comprising the following steps: Obtain distance data between the projector and the screen; Based on the distance data and the preset distance-step relationship, obtain the preset number of running steps of the projector's focusing motor corresponding to the distance data; The focusing motor is controlled to operate based on the preset number of running steps to drive the lens module of the projector to focus; The initial projection resolution of the projected image projected by the projector onto the screen after focusing is obtained, and it is determined whether the initial projection resolution reaches the preset projection resolution range. If the initial projection clarity does not reach the preset projection clarity range, control the focus motor to drive the lens module of the projector to refocus until the clarity of the projected image projected by the projector on the screen reaches the preset projection clarity range, and obtain the actual number of steps of the focus motor at this time. The preset distance-step relationship is updated based on the actual number of steps taken.

[0006] Preferably, the step of updating the preset distance-step relationship based on the actual number of steps taken includes: Based on the distance data, the actual number of steps the focusing motor takes to focus within a preset number of times is obtained; Based on the number of times the focusing motor focuses and the actual number of steps taken during each focusing, the average value of the actual number of steps taken by the focusing motor is calculated, and the preset distance-step relationship is updated based on the average value of the actual number of steps taken. The formula for calculating the average number of actual running steps is as follows: ; in, For the first The actual number of steps for each focusing operation. The number of times the focusing motor performs a focusing operation. For distance data The average number of actual running steps of the focusing motor at that time.

[0007] Preferably, the step of updating the preset distance-step relationship based on the actual number of steps taken further includes: When the preset number of times is exceeded, the latest actual motor running steps of the focusing motor are obtained; Based on the actual number of motor steps corresponding to the previous preset number of times, obtain the average value of the actual number of steps of the previous preset number of times; Calculate the standard deviation of the latest actual motor running steps of the focusing motor within the set of values ​​of all actual running steps, and determine whether the standard deviation is within the standard range; If it is within the standard range, the latest actual motor running steps will replace the old actual motor running steps within the previous preset number of times; If the value is outside the standard range, an error alert will be issued. The formula for calculating the standard deviation is as follows: ； in, For the first The actual number of steps for each focusing operation. The number of times the focusing motor performs a focusing operation. This is the average of the actual number of steps taken in the previously preset number of runs. This represents the standard deviation.

[0008] Preferably, the preset number of times is greater than or equal to 50.

[0009] Preferably, after the step of determining whether the initial projection sharpness reaches the preset projection sharpness range, the method includes: If the initial projection clarity reaches the preset projection clarity range, the preset number of running steps will be used as the actual number of motor running steps.

[0010] Preferably, before the step of acquiring the distance data between the projector and the screen, the method further includes: Obtain the parameter information of the projector; The preset distance-step relationship is obtained based on the parameter information.

[0011] Preferably, after updating the preset distance-step relationship based on the actual number of steps taken, the method further includes: Control the projector to move on the guide rail to adjust the distance between the projector and the screen; Perform the steps of obtaining the distance data between the projector and the screen, and subsequent steps.

[0012] This invention also discloses a projector focus testing system, comprising: The distance acquisition module is used to acquire distance data between the projector and the screen; The focusing module is used to obtain a preset number of running steps for the focusing motor of the projector corresponding to the distance data based on the distance data and a preset distance-step relationship; control the focusing motor to drive the lens module of the projector to focus based on the preset number of running steps; obtain the initial projection clarity of the projected image projected by the projector on the screen after focusing, and determine whether the initial projection clarity reaches a preset projection clarity range; if the initial projection clarity does not reach the preset projection clarity range, control the focusing motor to drive the lens module of the projector to refocus until the clarity of the projected image projected by the projector on the screen reaches the preset projection clarity range, and obtain the actual number of running steps of the focusing motor at this time. The execution module is used to update the preset distance-step relationship based on the actual number of steps taken.

[0013] The present invention also discloses a projector focus testing device, which includes: a memory, a processor, and a projector focus testing program stored in the memory and executable on the processor. When the projector focus test is executed by the processor, it implements the steps of the projector focus testing method as described in any of the above claims.

[0014] The present invention also discloses a storage medium storing a projector focus test program, wherein when the projector focus test program is executed by a processor, it implements the steps of the projector focus test method as described in any of the preceding claims.

[0015] Beneficial Effects: The technical solution of this invention first obtains the distance data between the projector and the screen. Then, based on the distance data and a preset distance-step relationship, it obtains a preset number of running steps for the projector's focusing motor corresponding to the distance data. Next, based on the preset number of running steps, it controls the focusing motor to drive the projector's lens module to focus, thereby quickly obtaining the projector's position and performing rapid initial focusing on the projector's lens. Then, it obtains the initial projection clarity of the projected image on the screen after focusing and determines whether the initial projection clarity reaches a preset range of projection clarity. If the initial projection clarity does not reach the preset projection clarity range, it controls the focusing motor to drive the projector's lens module to refocus until the clarity of the projected image on the screen reaches the preset projection clarity range, and obtains the actual number of running steps of the focusing motor at this time. Based on the actual number of running steps, it updates the preset distance-step relationship to obtain more accurate new adjustment control data, reduce the error range of the control data, and thus improve the efficiency of focus testing and ensure the accuracy of focus testing. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a flowchart of an embodiment of a projector focus testing method according to the present invention; Figure 2 This is a framework diagram of an embodiment of the projector focus testing system described in this invention. Figure 3 This is a schematic diagram of an embodiment of a projector focus testing system according to the present invention.

[0018] Explanation of icon numbers:

[0019] The above is a corresponding explanation of the attached diagram. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0022] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] This invention proposes a projector focus testing device, which can be a smartphone, PC (Personal Computer), tablet computer, portable computer, server or other terminal device.

[0024] The projector focusing test device includes: a processor (e.g., CPU), a communication bus, a user interface, a network interface, and a memory. The communication bus is used to enable communication between these components. The user interface may include a display screen, an input unit such as a keyboard, and optionally, a standard wired or wireless interface. The network interface may optionally include a standard wired or wireless interface (e.g., a Wi-Fi / Wireless Fidelity interface). The memory may be high-speed random access memory (RAM) or stable non-volatile memory (NVM), such as a disk drive. Alternatively, the memory may be a storage device independent of the aforementioned processor.

[0025] The network interface is mainly used for data communication with other devices; the user interface is mainly used for data interaction with users; the processor calls the projector focus test program stored in the memory and executes the projector focus test method provided in this embodiment of the invention.

[0026] This invention proposes a method for testing the focus of a projector.

[0027] like Figure 1 As shown, in one embodiment of the present invention, the projector focus testing method includes the following steps: S1. Obtain the distance data between the projector and the screen; S2. Based on the distance data and the preset distance-step relationship, obtain the preset number of running steps of the projector's focusing motor corresponding to the distance data; S3. Based on the preset number of running steps, control the focusing motor to drive the lens module of the projector to focus; S4. Obtain the initial projection clarity of the projected image projected by the projector on the screen after focusing, and determine whether the initial projection clarity reaches the preset range of projection clarity. S5. If the initial projection clarity does not reach the preset projection clarity range, control the focusing motor to drive the projector's lens module to refocus until the clarity of the projected image on the screen reaches the preset projection clarity range, and obtain the actual number of steps the focusing motor takes at this time. S6. Update the preset distance-step relationship based on the actual number of steps taken.

[0028] The technical solution of this invention first acquires the distance data between the projector and the screen. Then, based on the distance data and a preset distance-step relationship, it acquires a preset number of operating steps for the projector's focusing motor corresponding to the distance data. Next, based on the preset number of operating steps, it controls the focusing motor to drive the projector's lens module to focus, thereby quickly acquiring the projector's position and performing rapid initial focusing on the projector's lens. Then, it acquires the initial projection clarity of the projected image on the screen after focusing and determines whether the initial projection clarity reaches a preset range. If the initial projection clarity does not reach the preset projection clarity range, it controls the focusing motor to drive the projector's lens module to refocus until the clarity of the projected image on the screen reaches the preset projection clarity range, and acquires the actual number of operating steps of the focusing motor at this time. Based on the actual number of operating steps, it updates the preset distance-step relationship to obtain more accurate new adjustment control data, reduce the error range of the control data, and thus improve the efficiency of focus testing and ensure the accuracy of focus testing.

[0029] In some implementations, the projector is equipped with an infrared ranging sensor.

[0030] Specifically, in some embodiments, prior to the step of acquiring the distance data between the projector and the screen, the method further includes: Obtain the parameter information of the projector; The preset distance-step relationship is obtained based on the parameter information.

[0031] Among them, the parameters of the projector itself include the information parameters of the projector's own projection lens; since different models and types of projectors have different projection lenses, and the databases corresponding to different types of projection lenses are also different, it is necessary to accurately obtain the lens information parameters of the projector itself to ensure the accuracy of subsequent adjustment data, thereby improving the focusing speed and ensuring the focusing effect.

[0032] Specifically, in some embodiments, in S1, the step of acquiring the distance data between the projector and the screen includes: The distance data between the projector and the screen is obtained by using the distance measurement signal inside the projector.

[0033] In some embodiments, a distance sensor is provided on the inner wall of the projector housing; the distance sensor can be an ultrasonic distance sensor or an infrared distance sensor. By providing a distance sensor inside the projector, distance data can be acquired more accurately, ensuring the accuracy of the projection lens position adjustment; this overcomes the problem of inconsistent relative positions between the sensor located on the drive component and the projection lens affecting focus data.

[0034] Specifically, in step S4, the step of determining whether the initial projection sharpness reaches the preset range of projection sharpness further includes: If the initial projection sharpness reaches the preset projection sharpness range, the preset number of running steps is used as the actual number of motor running steps. In other words, if the adjustment is completed in one go based on the prior distance and the relationship between the focusing motors, no further adjustments are needed, and the preset number of running steps at this point is updated to the database as the actual number of motor running steps.

[0035] Specifically, in some embodiments, in step S6, the step of updating the preset distance-step relationship based on the actual number of steps taken includes: Based on the distance data, the actual number of steps the focusing motor takes to focus within a preset number of times is obtained; Based on the number of times the focusing motor focuses and the actual number of steps taken during each focusing, the average value of the actual number of steps taken by the focusing motor is calculated, and the preset distance-step relationship is updated based on the average value of the actual number of steps taken. The formula for calculating the average number of actual running steps is as follows: ; in, For the first The actual number of steps for each focusing operation. The number of times the focusing motor performs a focusing operation. For distance data The average number of actual running steps of the focusing motor at that time.

[0036] In some implementations, the preset number of times is greater than or equal to 50. For example, the preset number of times is 100, and the distance between the projector and the screen is 1100mm.

[0037] First, based on the distance data and the preset distance-step relationship, the preset number of steps for the focusing motor is obtained, and the focusing motor is quickly started to move the projector lens, and then automatic focusing is performed.

[0038] According to the normal distribution theory, the number of steps taken by the focusing motor should be distributed within a reasonable range, centered on the mean. However, if the number of steps taken by the focusing motor exceeds this range, it indicates a problem with the product. This method can be used to determine if there are excessive assembly deviations in the optical engine and lens assembly, or if the motor is out of step, resulting in product defects.

[0039] Specifically, in some embodiments, in step S6, the step of updating the preset distance-step relationship based on the actual number of steps taken further includes: When the preset number of times is exceeded, the latest actual motor running steps of the focusing motor are obtained; Based on the actual number of motor steps corresponding to the previous preset number of times, obtain the average value of the actual number of steps of the previous preset number of times; Calculate the standard deviation of the latest actual motor running steps of the focusing motor within the set of values ​​of all actual running steps, and determine whether the standard deviation is within the standard range; If it is within the standard range, the latest actual motor running steps will replace the old actual motor running steps within the previous preset number of times; If the value is outside the standard range, an error alert will be issued. The formula for calculating the standard deviation is as follows:

[0040] in, For the first The actual number of steps for each focusing operation; n is the number of focusing attempts by the focusing motor; S is the standard deviation. This is the average of the actual number of steps taken in the preset number of runs.

[0041] In some implementations, the standard deviation of the continuously collected operating steps of the focusing motor is calculated. This standard deviation tends to stabilize as the number of focusing tests increases. When the latest actual motor operating steps of the focusing motor are found to be outside the standard deviation range, a problem can be identified, and an anomaly alert is issued to remind testers to investigate the cause.

[0042] Specifically, in some embodiments, in step S4, the step of determining whether the initial projection sharpness reaches a preset range of projection sharpness includes the following: The projector's lens is used to project an image onto the screen, thus forming a projected image. The information of the projected image is transmitted to the database and compared with the preset value of the projection focus sharpness; Based on the comparison results, determine whether the initial projection sharpness meets the preset range of projection sharpness.

[0043] Specifically, in some embodiments, after step S6, following the step of updating the preset distance-step relationship based on the actual number of steps taken, the method further includes: Control the projector to move on the guide rail to adjust the distance between the projector and the screen; Perform the steps of obtaining the distance data between the projector and the screen, and subsequent steps.

[0044] In other words, the projector is placed on the guide rail, allowing it to move along the rail and thus adjust the distance between the projector and the screen. After completing the tests in steps S1-S6 at a certain distance, the projector is moved along the guide rail to adjust the distance between the projector and the screen. At this point, steps S1-S6 are repeated to start a new round of focus testing.

[0045] The present invention also proposes a projector focus testing system.

[0046] The projector focus testing system includes: The distance acquisition module is used to acquire distance data between the projector and the screen; The focusing module is used to obtain a preset number of running steps for the focusing motor of the projector corresponding to the distance data based on the distance data and a preset distance-step relationship; control the focusing motor to drive the lens module of the projector to focus based on the preset number of running steps; obtain the initial projection clarity of the projected image projected by the projector on the screen after focusing, and determine whether the initial projection clarity reaches a preset projection clarity range; if the initial projection clarity does not reach the preset projection clarity range, control the focusing motor to drive the lens module of the projector to refocus until the clarity of the projected image projected by the projector on the screen reaches the preset projection clarity range, and obtain the actual number of running steps of the focusing motor at this time. The execution module is used to update the preset distance-step relationship based on the actual number of steps taken.

[0047] Specifically, such as Figure 3 As shown, the projector focus testing system includes a projector 1, a screen 2, a control terminal 3, and a motion drive component. The projector 1 projects images onto the screen 2. The projector 1 has a focus drive module and a lens. The focus drive module includes a focus motor, which is connected to the lens. The motion drive component includes a stepper motor 41, which is connected to the projector 1 and drives the projector 1 to move towards or away from the screen 2. The control terminal 3 is electrically connected to the stepper motor 41 and the projector 1, and sends control signals to the drive component and receives focus data from the projector 1 and distance data between the projector 1 and the screen 2.

[0048] The control terminal 3 has a database of the distance and step count relationship required for projector focus testing and is used to receive and process control signals. The control terminal 3 can be a smartphone, PC (Personal Computer), tablet computer, laptop computer, server, or other terminal device.

[0049] In some implementation methods, such as Figure 3 As shown, the mobile drive assembly also includes a guide rail 42 and a support frame 43; the stepper motor 41 is mounted on the guide rail 42 and drivenly connected to the support frame 43, so that the support frame 43 moves in a direction toward or away from the screen 2; the support frame 43 is slidably connected to the guide rail 42, and the support frame 43 is used to place the projector 1; and the stepper motor 41 is electrically connected to the control terminal 3.

[0050] By controlling the stepper motor 41 to operate according to a certain number of rotation steps, the projector's movement distance can be better controlled to adjust the distance data between the projector and the screen, improve focus control efficiency, effectively eliminate human placement errors, and make the movement distance more precise, thereby improving focus testing efficiency and ensuring the accuracy of its focus results.

[0051] In some implementations, the projector is equipped with an infrared ranging sensor.

[0052] The present invention also provides a storage medium storing a projector focus test program, which, when executed by a processor, implements the steps of the projector focus test method as described in any of the above embodiments.

[0053] The specific embodiments of the computer-readable storage medium of the present invention are basically the same as the embodiments of the data display method described above, and will not be repeated here.

[0054] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for testing the focus of a projector, characterized in that, Includes the following steps: Obtain distance data between the projector and the screen; Based on the distance data and the preset distance-step relationship, obtain the preset number of running steps of the projector's focusing motor corresponding to the distance data; The focusing motor is controlled to operate based on the preset number of running steps to drive the lens module of the projector to focus; The initial projection resolution of the projected image projected by the projector onto the screen after focusing is obtained, and it is determined whether the initial projection resolution reaches the preset projection resolution range. If the initial projection clarity does not reach the preset projection clarity range, control the focus motor to drive the lens module of the projector to refocus until the clarity of the projected image projected by the projector on the screen reaches the preset projection clarity range, and obtain the actual number of steps of the focus motor at this time. Based on the distance data, the actual number of steps the focusing motor takes to focus within a preset number of times is obtained; Based on the number of times the focusing motor focuses and the actual number of steps taken during each focusing, the average value of the actual number of steps taken by the focusing motor is calculated, and the preset distance-step relationship is updated based on the average value of the actual number of steps taken. The formula for calculating the average number of actual running steps is as follows: Among them, step i Let N be the actual number of steps for the i-th focusing attempt, and N be the number of focusing attempts performed by the focusing motor. dis This represents the average number of actual running steps of the focusing motor when the distance data is dis. When the preset number of times is exceeded, the latest actual motor running steps of the focusing motor are obtained; Based on the actual number of motor steps corresponding to the previous preset number of times, obtain the average value of the actual number of steps of the previous preset number of times; Calculate the standard deviation of the latest actual motor running steps of the focusing motor within the set of values ​​of all actual running steps, and determine whether the standard deviation is within the standard range; If it is within the standard range, the latest actual motor running steps will replace the old actual motor running steps within the previous preset number of times; If the value is outside the standard range, an error alert will be issued. The formula for calculating the standard deviation is as follows: Among them, step i Let n be the actual number of steps for the i-th focusing attempt, and n be the number of focusing attempts performed by the focusing motor. dis S is the average of the actual number of steps taken in the pre-set number of runs, and S is the standard deviation. Control the projector to move on the guide rail to adjust the distance between the projector and the screen; Perform the steps of obtaining the distance data between the projector and the screen, and subsequent steps, to initiate a new round of focus testing.

2. The projector focus testing method according to claim 1, characterized in that, The preset number of times is greater than or equal to 50.

3. The projector focus testing method according to claim 1, characterized in that, After the step of determining whether the initial projection sharpness reaches the preset projection sharpness range, the following steps are included: If the initial projection clarity reaches the preset projection clarity range, the preset number of running steps will be used as the actual number of motor running steps.

4. The projector focus testing method according to claim 1, characterized in that, Before the step of acquiring the distance data between the projector and the screen, the method further includes: Obtain the parameter information of the projector; The preset distance-step relationship is obtained based on the parameter information.

5. A projector focus testing device, characterized in that, The projector focus testing device includes: a memory, a processor, and a projector focus testing program stored in the memory and executable on the processor. When the projector focus test is executed by the processor, it implements the steps of the projector focus testing method as described in any one of claims 1 to 4.

6. A storage medium, characterized in that, The storage medium stores a projector focus test program, which, when executed by a processor, implements the steps of the projector focus test method as described in any one of claims 1 to 4.

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