TW201630414A - Projector and calibration method thereof - Google Patents

Abstract

A calibration method for a projector includes capturing an image of fluid in a container of the projector, acquiring a first water level of fluid of a first side on an axis in the container according to the image of fluid, acquiring a second water level of fluid of a second side on the axis in the container according to the image of fluid, and calibrating an inclination angle on the axis of the projector by a calibrating device according to the first water level of fluid and the second water level of fluid.

Description

Projector and calibration method thereof

The invention describes a projector and a calibration method thereof, in particular a method for correcting the tilt angle of a water-cooled projector.

With the development of projectors, projectors with various functions have gradually appeared. In general, projectors are divided into wall-mounted projectors (also known as fixed projectors) and portable projectors (directly placed on the platform). Regardless of the type of projector, when the projector projects an image onto the screen, if the level of the projector does not match the screen, the distance between the image light and the screen may be inconsistent and the screen may be distorted. For example, when the projector's body is tilted left and right, the image projected onto the screen will be rotated. When the projector's body is tilted back and forth, the image projected onto the screen changes to a trapezoid.

At present, there are two methods for the projector to correct the tilt of the body, one for manual adjustment and the other for automatic adjustment. The step of manually adjusting the tilt of the body is to manually adjust the horizontal line of the projector to ease the rotation or deformation of the image on the screen by the user's visual experience. The step of automatically adjusting the tilt of the body is to use a device such as an angle sensor or a gravity sensor (G-Sensor) inside the projector to detect the change of the tilt angle through the sensor, and then automatically use the angle data. Corrects the rotation or distortion of the image on the screen. However, manually adjusting the tilt of the body is time consuming and labor intensive. In addition to high cost, angle sensors or gravity sensors must be frequently maintained and reset corrected to ensure that each is used. The accuracy of the secondary sensing is not sufficient.

Therefore, the development of an automated, low-cost and no need to reset the calibration method, can be It is very important to correct the tilt angle of the projector body.

An embodiment of the present invention describes a method for correcting a projector, comprising the image capturing device capturing a fluid image in a receiving slot in the projector. The image capturing device obtains the first water level of the fluid in the accommodating groove on the first side of the axial direction according to the fluid image. The image capturing device obtains a second water level of the fluid in the accommodating groove on the second side of the axial direction according to the fluid image. The correcting device corrects the tilt angle of the projector in the axial direction according to the first water level and the second water level.

Another embodiment of the present invention describes a projector including a receiving slot, an image capturing device, a correcting device, and a processor. The accommodating groove is for accommodating the fluid, and the image capturing device is facing the accommodating groove for capturing the fluid image in the accommodating groove, the correcting device is coupled to the image capturing device, and the processor is electrically connected to the correcting device and the image capturing device The device, wherein the processor obtains the first water level corresponding to the first side and the second water level corresponding to the second side in an axial direction according to the fluid image, and the processor controls the first water level and the second water level according to the first water level and the second water level. The correcting means corrects the tilt angle of the projector in the axial direction.

100‧‧‧Projector

10‧‧‧ accommodating slots

11‧‧‧Image capture device

12‧‧‧ Processor

13‧‧‧ calibration device

H _L , H _R , H _F , H _B ‧‧‧ water level

L‧‧‧ water level

P1 to P5‧‧‧

△H ₁ (1) to △H ₁ (5)‧‧‧ water level difference

S1 to S6‧‧‧ steps

Fig. 1 is a block diagram showing the components of a projector according to an embodiment of the present invention.

Fig. 2 is a schematic view showing the fluid image of the projector of the first embodiment, when the body is at an oblique angle of left high and low right.

Fig. 3 is a schematic view showing the fluid image of the projector of the first embodiment, when the body is at an oblique angle of the left low and the right height.

Fig. 4 is a schematic view showing the fluid image of the projector of the first embodiment, when the body is inclined at the same time on both axes.

Fig. 5 is a schematic view showing the use of progressive tilt correction for the projector of the first embodiment.

Fig. 6 is a flow chart for correcting the tilt angle of the projector of the first embodiment.

1 is a block diagram of components of a projector 100 according to an embodiment of the present invention. As shown in FIG. 1, the projector 100 includes a housing slot 10, an image capturing device 11, a processor 12, and a calibration device 13. The projector 100 in this embodiment is a water-cooled projector, and the accommodating slot 10 is for accommodating a fluid to cool the projector 100 via a water-cooled cycle. The fluid in the accommodating tank 10 is not limited to pure water, and may be a liquid coolant or a liquefied gas. The image capturing device 11 is disposed in the projector 100, and the lens is directed toward the receiving slot 10 for capturing the fluid image in the receiving slot 10. The correcting means 13 is used to correct the tilt angle of the projector 100 in the first axial direction and the second axial direction. The processor 12 is electrically connected to the correction device 13 and is located within the image capture device 11 for controlling the correction device 13 to correct the tilt angle of the projector 100 in two axial directions. The processor 12 of this embodiment may be a Logical Control Unit, a Micro-Processor, a Micro-Control Unit, or any component with computing power. Although the processor 12 in this embodiment is disposed in the image capturing device 11, the present invention is not limited thereto. The processor 12 in other embodiments may be any space disposed in the projector 100, and the electrical connection The image capturing device 11 and the correcting device 13 may even be a processor connected externally via the projector 100. For example, the projector 100 may be connected to a processing device on the cloud machine. The image capturing device 11 of the projector 100 of the present invention has the ability to capture fluid images in the receiving slot 10, such as a miniature camera, a micro camera, or a micro video recorder. After the processor 12 analyzes and processes the fluid image, the correcting device 13 can be automatically controlled to correct the tilt angle of the projector 100. Hereinafter, the fluid image corresponding to the projector 100 at different inclination angles of the body and the process of correcting the inclination angle of the body according to the fluid image will be described in detail.

Fig. 2 is a schematic view showing the fluid image of the projector 100 of the first embodiment, when the body is at an oblique angle of left high and low right. The third figure is a schematic view of the fluid image of the projector 100 of the first embodiment, when the body is at an oblique angle of the left low and the right height. In order to simplify the description, the left and right tilting state of the projector 100 in the first axial direction is considered first. In Fig. 2, the shape of the accommodating groove 10 is a cube, but the shape of the accommodating groove of the present invention may be any shape. When the body of the projector is tilted to the right, the horizontal plane L of the fluid in the receiving groove 10 is still parallel to the ground plane on which the projector 100 is placed. In the FIG. 2, because the projector 100 for the left high low tilt, so that the fluid level within 10 right side surface of the receiving groove height H _R than the level of the left side surface of the height H _L must be high, i.e., H _R> H _L . At this time, the fluid image captured by the image capturing device 11 and located inside the accommodating groove 10 is as shown in FIG. 2 . Subsequently, the processor 12 in the image capturing device 11 performs image processing on the fluid image to increase the accuracy of the correction. For example, the processor 12 sharpens the fluid image, denoises, and zooms (Resize). ) to estimate the actual water level height H _R and the water level height H _L . After obtaining the actual water level height H _R and the water level height H _L according to the fluid image, the processor 12 further subtracts the water level height H _R from the water level height H _L to obtain a water level difference ΔH ₁ , that is, ΔH ₁ =H _R -H _L . In Fig. 2, since the projector 100 takes into consideration the fact that the body is inclined at the left, right, and low, HR _> H _L causes ΔH _{1 to} be a positive number. The processor 12 based on positive level difference △ H ₁ of the inclination angle of the projector 100 determines a left and right low-high, and further the water level difference △ H ₁ calculates the inclination angle of the projector 100 according to the first axial direction, and the correction control means 13 The tilt angle of the projector 100 in the first axial direction is corrected.

In the third embodiment, when the projector 100 is tilted to the left, the right, and the right, the image capturing device 11 captures the fluid image inside the accommodating groove 10, and the fluid is in the accommodating groove 10. The water level height H _{R of the} inner right side surface is lower than the water level height H _{L of the} left side surface, that is, H _R <H _L . After the image processing of the fluid image by the processor 12, the water level height H _R is subtracted from the water level height H _L to obtain a negative water level difference ΔH ₁ , that is, ΔH ₁ =H _R -H _L and ΔH ₁ < 0. The processor 12 based on a negative level difference △ H ₁ determines the inclination angle of the projector 100 is a high low left and right, and further in accordance with the water level difference △ H ₁ calculates the inclination angle of the projector 100 in a first axial direction, and the correction control means 13 The tilt angle of the projector 100 in the first axial direction is corrected.

Although the present embodiment describes a method in which the projector 100 corrects the first axial upward tilt angle according to the water level difference in the fluid image, the present invention is not limited thereto. In other embodiments, projector 100 will simultaneously correct the first axial and second axial upward tilt angles based on the water level difference in the fluid image. Fig. 4 is a schematic view showing the fluid image of the projector of the first embodiment, when the body is inclined at the same time on both axes. In FIG. 4, the image capturing device 11 captures the fluid image in the interior of the receiving slot 10 of the projector 100, and after the image processing is processed by the processor 12, the processor 12 obtains the fluid in the receiving slot 10. The water level height H _L on the left side of the first axial direction (left and right axial direction) and the water level height H _{R of the} right side surface, and the water level height H _F of the front side of the second axial direction (front and rear axial direction) and the water level height of the rear side surface H _B . Subsequently, the processor 12 subtracts the water level height H _R from the water level height H _L to obtain a water level difference ΔH ₁ corresponding to the first axial direction, and subtracts the water level height H _F from the water level height H _B to obtain A water level difference ΔH ₂ corresponding to the second axial direction, that is, ΔH ₁ =H _R -H _L and ΔH ₂ =H _F -H _{B is obtained} . The processor 12 further determines the tilt direction of the projector 100 in the first axial direction and the second axial direction by the polarity of the water level difference ΔH ₁ and the water level difference ΔH ₂ . For example, when ΔH ₁ > 0, the processor 12 determines that the projector 100 is tilted to the left, right, and low in the first axis. When ΔH ₁ < 0, the processor 12 determines that the projector 100 is tilted to the left, the right, and the right, in the first axial direction. When ΔH ₂ > 0, the processor 12 determines that the projector 100 is tilted from the front to the rear in the second axial direction. When ΔH ₂ <0, the processor 12 determines that the projector 100 is tilted from the front to the rear in the second axial direction. Subsequently, the processor 12 controls the correction device 13 to correct the tilt angle of the projector 100 in the first axial direction and the second axial direction based on the water level difference ΔH ₁ and the water level difference ΔH ₂ . The steps of how the processor 12 in the projector 100 controls the correction device 13 to perform tilt correction on the projector 100 will be described below.

Fig. 5 is a schematic view showing the progressive tilt correction of the projector 100 of the first embodiment. In the present embodiment, the correcting means 13 corrects the tilt angle of the projector 100 in a progressive manner, and progressively corrects the tilt angle of the projector 100 using continuity correction so that the corrected water level difference of the projector 100 satisfies the predetermined The range to ensure the amount of error in the tilt angle of the fuselage is acceptable. The process is detailed below. In FIG. 5, the Y axis represents the water level difference of the fluid in the first axial direction of the processor 12 (however, the correction mechanism of the second axial direction is similar to the first axial direction, and thus the correction method comparable to the first axial direction ), the X axis is the time axis. The water level difference at the time point P1 is ΔH ₁ (1), the water level difference at the time point P2 is ΔH ₁ (2), the water level difference at the time point P3 is ΔH ₁ (3), and the water level difference at the time point P4 is Δ. H ₁ (4), the water level difference at time point P5 is ΔH ₁ (5). In the present embodiment, during the tilt correction process of the projector 100, the function value ΔH ₁ ( ̇ ) of the water level difference with time changes to convergence (Convergence). At the time point P1, the processor 12 controls the correcting means 13 to correct the projector 100 based on the water level difference ΔH ₁ (1). After the projector 100 performs the correcting operation between the time point P1 and the time point P2, there is still a water level difference ΔH ₁ (2) at the time point P2, and the processor 12 compares the water level difference ΔH ₁ (1) at the time point P1 and The water level difference ΔH ₁ (2) after the value of the time point P2, it is determined that the water level difference ΔH ₁ (1) is not equal to the water level difference ΔH ₁ (2), and the water level difference ΔH ₁ (2) is not within the predetermined range. Therefore, it indicates that the change in the function of the water level difference with the projector 100 has not converged, and the water level difference ΔH ₁ (2) at the time point P2 still has a high error value, so the processor 12 will project the projection after the time point P2. Machine 100 continues to correct. After the projector 100 performs the correction operation again from the time point P2 to the time point P3, there is still a water level difference ΔH ₁ (3) at the time point P3, and the processor 12 compares the water level difference ΔH ₁ (2) at the time point P2. And the water level difference ΔH ₁ (3) After the value of the time point P3, it is determined that the water level difference ΔH ₁ (2) is not equal to the water level difference ΔH ₁ (3), and the water level difference ΔH ₁ (3) is not in the predetermined range. In the meantime, the change in the function of the water level difference of the projector 100 over time has not yet converged, and the water level difference ΔH ₁ (3) at the time point P3 still has a high error value, so the processor 12 will be after the time point P3. The projector 100 continues to correct. Similarly, after the projector 100 performs the correcting operation between the time point P4 and the time point P5, the processor 12 compares the water level difference ΔH ₁ (4) at the time point P4 and the water level difference ΔH ₁ (5) at the time point. After the value of P5, it is determined that the water level difference ΔH ₁ (4) is nearly equal to the water level difference ΔH ₁ (5), and the water level difference ΔH ₁ (5) is within a predetermined range, indicating that the water level difference of the projector 100 is over time. The change in function value has converged, and the amount of error equivalent to the tilt angle of the fuselage has been corrected to an acceptable range, so the processor 12 will stop continuing to correct the projector 100.

Fig. 6 is a flow chart for correcting the tilt angle of the projector 100 of the first embodiment. In the fifth embodiment, the method for correcting the tilt angle of the projector 100 includes the steps S1 to S5, as follows: S1: the image capturing device 11 captures the fluid image in the receiving slot 10 of the projector 100; S2: image capturing The processor 12 in the device 11 respectively obtains the water level H _{R of the} accommodating groove 10 on the first side of the first axial direction and the water level H _{L of the} second side according to the fluid image; S3: the processor in the image capturing device 11 12 according to the fluid image, respectively obtaining the water level H _{F of the} accommodating groove 10 on the third side of the second axial direction and the water level H _{B of the} fourth side; S4: the processor 12 operates the correcting device 13 according to the water level H _R and the water level H _L , the water level H _F and the water level H _B correct the tilt angle of the projector 100 in the first axial direction and the second axial direction; S5: The processor 12 checks whether the change in the function value of the water level difference ΔH ₁ and ΔH ₂ with time converges And the corrected water level difference ΔH ₁ and ΔH ₂ fall within a predetermined range; and S6: if the water level difference ΔH ₁ and ΔH ₂ change with time as a function of convergence, and the corrected water level difference Δ When H ₁ and ΔH ₂ fall within a predetermined range, the processor 12 will end the calibration procedure for the projector 100.

Through the calibration process of the above steps S1 to S6, the projector 100 corrects the originally larger tilt angle to the tilt angle of the receivable range, and the steps S1 to S6 are fully automated corrections, and the user does not need to project the projection. The machine 100 performs the act of correcting the angle reset.

In summary, the present invention discloses a projector and a method for correcting the tilt angle of the body, the concept of which utilizes the characteristics that the fluid level in the interior of the projector is parallel to the horizon, and uses the image capturing device to capture the content in time. Fluid image in the tank. After the processor processes the fluid image, the water level difference is obtained according to the degree of deviation of the horizontal plane, and then the correction device is operated to gradually correct the tilt. Therefore, the projector of the present invention does not require an extra expensive device that needs to be reset, that is, it can be completely compared to a conventional projector that requires an angle sensor or a device such as a gravity sensor (G-Sensor) to detect the tilt angle. The automated program allows the projector to achieve high accuracy tilt angle correction.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

100‧‧‧Projector

10‧‧‧ accommodating slots

11‧‧‧Image capture device

12‧‧‧ Processor

13‧‧‧ calibration device

Claims (10)

A method for correcting a projector includes: an image capturing device capturing a first fluid image in a receiving slot of the projector; and obtaining the receiving slot in a first axial direction according to the first fluid image a first water level on the first side; obtaining a second water level of the accommodating groove on a second side of the first axial direction according to the first fluid image; and a correcting device according to the first water level and The second water level corrects a first tilt angle of the projector in the first axial direction. The method of claim 1, further comprising subtracting the first water level from the first water level to generate a first water level difference of the accommodating groove, wherein the correcting device is configured according to the first water level and the second water level Correcting the tilt angle of the projector in the first axial direction is that the correcting device corrects the first tilt angle of the projector in the first axial direction according to the first water level difference. The method of claim 2, wherein the correcting means corrects the first tilt angle of the projector in the first axial direction according to the first water level difference, that is, if the first water level difference is a negative number, The correcting device corrects a tilt angle of the projector on the first side in the first axial direction according to the first water level difference. The method of claim 2, wherein the correcting means corrects the first tilt angle of the projector in the first axial direction according to the first water level difference, that is, if the first water level difference is a positive number, The correcting device corrects a tilt angle of the projector on the second side of the first axis according to the first water level difference. The method of claim 2, wherein the correcting means corrects the cast according to the first water level difference The first tilt angle of the camera in the first axial direction includes: the correcting device corrects the projector at the first angle according to the first water level difference; the projector uses the first After the angle is corrected, the image capturing device captures a second fluid image in the receiving slot, and updates the first water level and the second water level to a third water level and a fourth water level, respectively; a third water level and the fourth water level, generating a second water level difference of the accommodating groove; wherein if the second water level difference is within a predetermined range, the correcting device stops correcting the tilt of the projector in the first axial direction angle. The method of claim 2, further comprising: the image capturing device obtaining a third water level of the accommodating groove on a third side of the second axial direction according to the first fluid image; the image capturing device Obtaining a fourth water level of the accommodating groove on one of the fourth sides of the second axial direction according to the image of the fluid state; and subtracting the fourth water level from the third water level to generate a second of the accommodating groove a water level difference; and the correcting means corrects a second tilt angle of the projector in the second axial direction based on the second water level difference. The method of claim 6, wherein the correcting means corrects the second tilt angle of the projector in the second axial direction according to the second water level difference, that is, if the second water level difference is a negative number, The correcting device corrects a tilt angle of the projector on the third side in the second axial direction according to the second water level difference. The method of claim 6, wherein the correcting means corrects the second tilt angle of the projector in the second axial direction according to the second water level difference, that is, if the second water level difference is a positive number, The correcting means corrects an oblique depression angle of the projector on the fourth side in the second axial direction according to the second water level difference. The method of claim 6, wherein the correcting means corrects the second tilt angle of the projector in the second axial direction according to the second water level difference, the correcting means according to the second water level difference, Correcting the projector at a second angle in the second axis; after the projector is corrected by the second angle, the image capturing device captures a second fluid image in the receiving slot and updates the The third water level and the fourth water level are respectively a fifth water level and a sixth water level; and according to the fifth water level and the sixth water level, a third water level difference of the accommodating groove is generated; wherein the third water level The correction means stops correcting the second tilt angle of the projector in the second axial direction within a predetermined range. A projector includes: a receiving slot for accommodating a fluid; an image capturing device, the image capturing device facing the receiving slot for capturing a fluid image in the receiving slot; and a correcting device The image capturing device is coupled to the image capturing device; and a processor electrically connecting the correcting device and the image capturing device; wherein the processor obtains the receiving groove in an axial direction corresponding to a first side according to the fluid image A first water level and a second water level corresponding to a second side, the processor controls the correcting device to correct the tilt angle of the projector in the axial direction according to the first water level and the second water level.