JP4326387B2 - Projection type display device and automatic focus adjustment method for projection type display device - Google Patents

Description

  The present invention relates to a projection display device that displays an image on a projection surface and an automatic focus adjustment method thereof, and in particular, a projection type that can automate setting adjustment when the distance between the projection surface and the projector device is variable. The present invention relates to a display device and an automatic focus adjustment method thereof.

  Conventionally, when an image is projected onto a screen using a projection display device (projector), it is first necessary to perform a focusing operation (focus adjustment) of the image projected on the projection surface of the screen. In the focus adjustment of the projector, when the distance between the projector main body and the projection surface is variable, it is necessary to manually adjust the focus according to the projection distance, and this operation is troublesome for the user. In order to cope with such a variable projection distance, an autofocus system that automatically performs focus adjustment has been proposed.

  As an apparatus for performing focus adjustment by autofocus, for example, in Patent Document 1, an adjustment image pattern projected on a screen is photographed by a CCD camera or the like, and the photographed adjustment image pattern is input again from an input circuit. A focus adjustment device has been proposed that performs autofocus adjustment by comparing the frequency components of this input pattern and driving the projection lens with an electric motor until a predetermined high frequency component is configured.

In Patent Document 2, a test pattern projected from a projector is captured by a monitor camera, data of the captured monitor image is analyzed, and a focus detection unit determines a best focus point (a point on the sensor camera). A projector and automatic screen position adjustment method and apparatus for adjusting the focus of a projection lens according to the determined best point are disclosed.
JP 2000-28901 A JP 2000-241874 A

As described above, the autofocus according to the conventional technology is based on the premise that the lens of the sensor camera is in focus when performing the focus adjustment. In recent years, the focus detection unit included in the sensor camera determines the best focus point. There has been proposed an autofocus function that adjusts the focus of the sensor camera according to the determined best point of focus.
For example, when the installation position of the projection display device and the screen is almost determined and the lens of the sensor camera can be focused, the above conventional technique can be applied. When the positions of the apparatus and the screen are variable, if there is a position where the lens of the sensor camera is out of focus, the focus lens accuracy of the projection lens is lowered.

  Therefore, in order not to reduce the focus adjustment accuracy, the camera lens driving unit and the focus detection unit are provided in the sensor camera so that the focus adjustment of the camera lens of the sensor camera can be automatically performed. By adjusting the focus of the projection lens in a focused state, the optimum focus position of the projection lens can be obtained. However, even in an environment where a single color projection surface such as a wall is imaged and the focus detection result does not change even if the camera lens is driven, the optimum focus of both the camera lens and the projection lens of the sensor camera A method for automatically obtaining the position has not been proposed.

  The present invention has been made in view of the above circumstances, and is a projection type display that automatically adjusts the focus of both the camera lens and the projection lens regardless of the installation environment and increases the degree of freedom of projector installation. It is an object of the present invention to provide an automatic focus adjustment method for an apparatus and a projection display apparatus.

The first technical means includes a projection lens capable of performing focus adjustment, a sensor camera that captures an image projected by the projection lens, a focus detection unit that detects the focus of the image captured by the sensor camera, and focus detection A calculation processing unit that calculates a detection result detected by the unit, a lens control unit that determines a rotation direction of the projection lens according to a result calculated by the calculation processing unit, and a projection that rotates the projection lens according to the determination of the lens control unit A projection display device that automatically adjusts the focus of the projection lens by rotating the projection lens by the projection lens drive unit, the sensor camera has a camera lens that can perform the focus adjustment, Camera lens drive unit that rotates the camera lens to adjust the focus of the camera lens A camera AF adjustment unit for automatically adjusting the focus of the camera lens, and a camera AF lock control unit for fixing the focus position of the camera lens. The lens control unit controls the camera AF lock control unit. A projection display device that adjusts the focus of a projection lens by driving the projection lens drive unit with a projection lens drive unit in a state where the focus position of the camera lens is fixed . The projection display device performs focus adjustment A pattern generation unit that generates a test pattern for output and a video output unit that outputs a video for projecting the test pattern generated by the pattern generation unit, and the focus detection unit outputs a test pattern projected by the projection lens. By detecting the focus of the test pattern imaged by the sensor camera, Focus adjustment is automatically performed, and the lens control unit controls the camera AF lock control unit to fix the focus position of the camera lens. Then, the projection lens drive unit drives the projection lens drive unit to adjust the focus of the projection lens. And a second control for automatically adjusting the focus of the camera lens by the camera AF adjustment unit in a state where the lens control unit controls the projection lens driving unit to fix the focus position of the projection lens. The operation is performed by alternately repeating a plurality of times .

According to a second technical means, in the first technical means, the camera AF adjusting unit automatically adjusts the focus of the camera lens by detecting the focus of the test pattern imaged by the sensor camera. Is.

The third technical means fixes the first operation for adjusting the focus of the projection lens in a state where the focus adjustment position of the camera lens is fixed and the focus position of the projection lens in the first or second technical means. The second operation for adjusting the focus of the camera lens in a state where the focus detection is performed is alternately repeated until the difference between the detection results of the focus detection unit in the previous operation and the current operation becomes a predetermined threshold value or less. It is.

A fourth technical means has exploited Merarenzu also a sensor function in addition to at least a projection lens, the projection display device that performs automatic focus adjustment of the projection type display device by detecting the focus of the projection image by the camera lens in the automatic focus adjustment process, the automatic comprising the step of performing the AF lock control for fixing the focus position of the camera lens, the focus position of the camera lens was fixed, the focus adjustment of the projection lens automatically by driving the projection lens A focus adjustment method, comprising: a step of automatically adjusting a focus of a projection lens by detecting a focus of a test pattern for performing a focus adjustment projected from a projection lens of a projection display device. The automatic step is the focus of the camera lens. A first step of fixing the position and driving the projection lens to adjust the focus of the projection lens, and a second step of automatically adjusting the focus of the camera lens with the focus position of the projection lens fixed. Are repeated alternately a plurality of times .

According to a fifth technical means, in the fourth technical means, the first step of adjusting the focus of the projection lens with the focus position of the camera lens fixed, and the camera with the focus position of the projection lens fixed. The second step of adjusting the focus of the lens is alternately repeated until the difference between the detection results of the focus detection unit in the previous step and the current step becomes a predetermined threshold value or less.

A sixth technical means includes a projection lens capable of performing focus adjustment, a sensor camera that captures an image projected by the projection lens, a focus detection unit that detects a focus of the image captured by the sensor camera, and focus detection A calculation processing unit that calculates a detection result detected by the unit, a lens control unit that determines a rotation direction of the projection lens according to a result calculated by the calculation processing unit, and a projection that rotates the projection lens according to the determination of the lens control unit A projection display device that automatically adjusts the focus of the projection lens by rotating the projection lens by the projection lens drive unit, the sensor camera has a camera lens that can perform focus adjustment; A camera lens drive unit that rotates the camera lens to adjust the focus of the camera lens Lens control unit, by driving the camera lens driving unit according to the result calculated by the arithmetic processing unit, a projection display apparatus that can perform focus adjustment of the camera lens automatically, the focus adjustment A pattern generation unit that generates a test pattern to be performed; and a video output unit that outputs a video to project the test pattern generated by the pattern generation unit. The focus detection unit is projected by a projection lens and is By detecting the focus of the test pattern imaged by the camera, the focus adjustment of the projection lens and the camera lens is automatically performed, and the lens control unit determines the focus position of one of the camera lens and the projection lens. With the lens fixed, the other lens is driven to adjust the focus. It is obtained characterized by a plurality of times alternately.

According to a seventh technical means, in the sixth technical means, the lens control unit performs the focus adjustment by driving the other lens in a state where the focus position of one lens is fixed as the previous operation. This operation is characterized in that it is repeated until the difference in the detection result of the focus detection unit becomes a predetermined threshold value or less.

An eighth technical means have exploited Merarenzu also a sensor function in addition to at least a projection lens, the projection display device that performs automatic focus adjustment of the projection type display device by detecting the focus of the projection image by the camera lens In the automatic focus adjustment method, when performing the focus adjustment of one of the projection lens and the camera lens, a step of performing the focus adjustment by fixing a lens other than the lens for performing the focus adjustment, and the focus adjustment. And a step of adjusting the focus of another lens, and a method of automatically adjusting the focus of all the lenses included in the projection display device. The focus adjustment of the image display device is the focus projected from the projection lens of the projection display device. This is performed automatically by detecting the focus of the test pattern for adjustment, and the other lens is driven with the focus position of one of the camera lens and projection lens fixed. Thus, the focus adjustment operation is alternately performed a plurality of times for each lens .

The ninth technical means repeats the focus adjustment performed on each lens in the eighth technical means alternately until the difference between the detection results of the focus detection units in the previous and current focus adjustments is equal to or less than a predetermined threshold value. It is a feature.

  According to the present invention, the sensor lens focus adjustment by the autofocus adjustment function of the sensor camera, the test pattern projected on the screen is imaged by the sensor camera, and the focus adjustment of the projection lens is performed according to the imaging result. It is possible to automatically obtain the optimum focus positions of both the camera lens and the projection lens. Further, by repeating the above-mentioned camera lens and projection lens focus adjustment alternately, a more optimal focus position can be detected. As a result, the focus adjustment of both the camera lens and the projection lens can be automatically performed with high accuracy without depending on the distance between the projector and the screen and the installation environment, and the degree of freedom in installing the projection display device is increased. be able to.

  Furthermore, according to the present invention, a lens driving unit is provided in each of the camera lens and the projection lens of the sensor camera, the test pattern projected on the screen is imaged by the sensor camera, and the lens and projection lens of the sensor camera are captured according to the imaging result. By adjusting the focus of both lenses, it is possible to automatically obtain the optimum focus position of both the lens of the sensor camera and the projection lens. Further, by repeating the above-mentioned camera lens and projection lens focus adjustment alternately, a more optimal focus position can be detected. As a result, the focus adjustment of both the camera lens and the projection lens can be automatically performed with high accuracy without depending on the distance between the projector and the screen, and the degree of freedom in installing the projection display device can be increased. .

(Embodiment 1)
FIG. 1 is a diagram for explaining the configuration of an embodiment of a projection display apparatus according to the present invention. In FIG. 1, the projection display device 1 performs an adjustment start button 11 for inputting an instruction to start the focus adjustment, a projection lens 12 that can perform focus adjustment, and a focus adjustment of the projection lens 12. A projection lens driving unit 13 that drives the projection lens 12, a sensor camera 14 installed on the front surface of the projection display device, a focus detection unit 15 that detects the focus of an image input by the sensor camera 14, and a focus detection unit 15 A calculation processing unit 16 that calculates the detection data of the lens, a lens control unit 17 that determines the rotation direction of the camera lens of the projection lens 12 and the sensor camera 14 according to the calculation data by the calculation processing unit 16, and a pattern generation unit that generates a test pattern 18 and the test pattern generated by the pattern generator 18 are projected. And an image output unit 19 of the fit, and is configured to project an image on the screen 2 by the light source 20 having the video output unit 19.

  FIG. 2 is a diagram for explaining the configuration of an embodiment of the sensor camera used in FIG. In FIG. 2, the sensor camera 14 captures an image via the camera lens 21 that can perform focus adjustment, a camera lens driving unit 22 that drives the camera lens 21 to adjust the focus of the camera lens 21, and the camera lens 21. The camera lens adjustment position, the camera AF adjustment unit 24 that controls the camera lens driving unit 22 based on the analysis result of the image data captured by the sensor 23, and the camera lens position is fixed regardless of the analysis result of the camera AF adjustment unit. A camera AF lock control unit 25.

  In the focus adjustment of the projection display device, first, the projector is installed so that an image can be projected from the projection display device body onto the screen, the image is projected from the projection display device on the screen, and the focus adjustment of the projection display device is performed. Start. The focus adjustment is started when the operator presses an adjustment start button 11 provided on the main body of the projection display device 1. Further, focus adjustment may be started by remote operation from a remote controller (not shown).

FIG. 3 is a diagram illustrating an example of a test pattern for focus detection. When the adjustment start button 11 is pressed by the operator, the pattern generation unit 18 generates a test pattern 30 for focus detection, the video output unit 19 outputs an image of the test pattern 30, and the projection lens 12 displays the screen 2. A test pattern 30 is projected.
The focus detection test pattern 30 shown in FIG. 3 is formed by a white cross patch with a black background. Such a test pattern 30 is not limited to the one shown in FIG. 3, but it is desirable that the test pattern 30 has such a shape that the change in luminance is large in the horizontal scanning or the vertical scanning of the projection image.

  After projecting the test pattern 30, the autofocus adjustment of the sensor camera 14 and the focus adjustment of the projection lens 12 are started. First, in the auto focus adjustment of the sensor camera 14 and the focus adjustment of the projection lens 12, the projection lens 12 is fixed by the lens control unit 17 while the auto focus adjustment of the sensor camera 14 is being performed. While the focus of the projection lens 12 is being adjusted, the camera AF lock control unit 25 is controlled from the lens control unit 17 and the camera lens 21 of the sensor camera 14 is fixed. For example, when the autofocus adjustment of the sensor camera 14 is performed, the autofocus adjustment of the sensor camera 14 is performed with the focus position of the projection lens 12 fixed.

  In the focus adjustment, first, the autofocus adjustment of the sensor camera 14 is performed. The test pattern 30 projected from the projection display device 1 forms an image on the screen 2 to generate a projected image. The reflected light from the screen is received by the camera lens 21 and the projection screen is imaged by the sensor 23.

The projection image of the test pattern 30 captured by the sensor 23 is input to the camera AF adjustment unit 24. The camera AF adjustment unit 24 analyzes the captured image data of the test pattern 30 and detects and calculates the high peak value of the amplitude of the horizontal signal or the vertical signal or the presence or absence of a higher-order frequency component by Fourier series expansion. In addition to performing processing, the rotation direction of the camera lens 21 is determined according to the calculation result, and a command signal based on the determination is output to the camera lens driving unit 22. The camera lens driving unit 22 is constituted by an electric motor or the like, and rotates the camera lens 21 according to a command signal from the camera AF adjustment unit 24. Further, focus detection is performed by the camera AF adjustment unit 24.
Thus, the above processing is repeated so that the best focus point of the camera lens 21 is set.

FIG. 4 is a diagram for explaining the relationship between the lens position and the luminance change. The position of the lens position at which the luminance value reaches the peak shown in FIG. 4 is the best focus of the camera lens.
If the best focus point of the camera lens 21 can be detected, the focus adjustment of the camera lens 21 is terminated, the camera AF lock control unit 25 is controlled, and the camera lens 21 is fixed.

  Then, the focus of the projection lens 12 is adjusted. A projection image of the test pattern 30 captured by the sensor camera 14 is input to the focus detection unit 15. The focus detection unit 15 analyzes the captured image data of the test pattern 30 and detects a place where the peak value of the amplitude of the horizontal signal or the vertical signal is high, or the presence or absence of a higher-order frequency component by Fourier series expansion. Then, the detection result in the focus detection unit 15 is arithmetically processed by the arithmetic processing unit 16.

  Then, the lens control unit 17 determines the rotation amount of the projection lens 12 according to the calculation data from the calculation processing unit 16, and outputs a command signal based on the determination to the projection lens driving unit 13. The projection lens driving unit 13 is configured by an electric motor or the like, and rotates the projection lens 12 according to a command signal from the lens control unit 17. Further, the focus detection unit 15 performs focus detection. Thus, the above processing is repeated so that the best focus point of the projection lens 12 is set. The best focus point in the projection lens 12 can be detected from the position where the luminance reaches a peak as shown in FIG.

  After the best focus point of the projection lens 12 is detected by the operation as described above, the projection lens 12 is fixed again, and the autofocus adjustment of the sensor camera 14 is performed again by the same processing. For example, in the initial state, when the autofocus adjustment of the sensor camera 14 is first performed, if the projection lens 12 is not in focus, the peak value of the peak value with respect to the lens position in the autofocus adjustment of the sensor camera 14 is low. Since the change in luminance is small, the accuracy of focus adjustment may be low. Therefore, after the best focus point of the projection lens 12 is detected, by performing the autofocus adjustment of the sensor camera 14 again, it is possible to perform an adjustment with higher accuracy than the first adjustment. After the best focus point of the sensor camera 14 is detected, the focus adjustment of the projection lens 12 is performed again.

  By repeating the operation as described above, the accuracy of focus adjustment of the camera lens 21 and the projection lens 12 becomes better than the state before the adjustment. Then, this operation is repeated, and the position where there is no difference in peak value compared to the previous focus adjustment is the optimum focus position for both lenses. That is, it is possible to obtain an optimum focus position by repeating until the focus detection result of each lens is substantially saturated without changing even if focus adjustment is performed.

FIG. 5 is a flowchart for explaining an example of the focus adjustment operation in the projection display apparatus of the present invention. The focus adjustment operation in the projection display apparatus will be described according to the flow of FIG. 5 with reference to FIGS.
First, when focus adjustment is started, the pattern generation unit 18 generates a test pattern 30 (step S1), the video output unit 19 outputs the test pattern 30, and the projection lens 12 applies the test pattern 30 to the screen 2. Projection is performed (step S2).

Then, auto focus adjustment of the sensor camera 14 is performed (step S3), and then focus adjustment of the projection lens 12 is performed (step S4). Then, the autofocus adjustment of the sensor camera 14 in step S3 and the focus adjustment of the projection lens 12 in step S4 are alternately repeated, and when the difference between the detected values before and after the focus adjustment becomes a predetermined threshold value or less, that is, each Focus adjustment ends when the focus detection result of the lens becomes saturated without substantially changing even if focus adjustment is performed.
The auto focus adjustment (step S3) of the sensor camera 14 and the focus adjustment of the projection lens 12 (step S4) may be performed in reverse order.

  FIG. 6 is a flowchart for more specifically explaining the autofocus adjustment operation of the sensor camera 14 in step S3 in FIG. First, when performing the autofocus adjustment of the sensor camera 14 in step S3, the focus of the test pattern 30 projected on the screen 2 is imaged by the sensor 23 (step S31). The captured test pattern 30 is input to the camera AF adjustment unit 24 (step S32). Here, the captured image data of the test pattern 30 is analyzed to detect a portion having a high peak value of the amplitude of the horizontal signal or the vertical signal, and it is determined whether or not a peak is detected based on the detection result (step) If the peak is detected, the process is terminated. If not detected, the rotation direction of the camera lens 21 is determined according to the detection data (step S34), and a command signal based on the determination is output to the camera lens drive unit 22. .

  The camera lens driving unit 22 drives the camera lens 21 in accordance with a command signal from the lens control unit 17 (step S35). When the camera lens focus adjustment is performed again, the process returns to step S31 and the same processing is performed.

  As described above, the auto focus adjustment of the sensor camera 14 and the focus adjustment of the projection lens 12 are repeatedly and alternately performed, and the focus adjustment is performed with the position where the peak value with respect to the lens position is a peak as the best focus of the camera lens. finish. Accordingly, in step S33, when it is determined that the peak has been detected as a result of repeated focus detection, the focus adjustment is terminated.

  FIG. 7 is a flowchart for more specifically explaining the focus adjustment operation of the projection lens 12 in step S4 in FIG. First, when the focus adjustment of the projection lens 12 in step S4 is performed, the test pattern 30 projected on the screen 2 is imaged by the sensor camera 14 (step S41). Then, the focus of the captured test pattern 30 is input to the focus detection unit 15 (step S42). The focus detection unit 15 analyzes the captured image data of the test pattern 30 to detect a portion having a high peak value of the amplitude of the horizontal signal or the vertical signal, and the detection result is subjected to arithmetic processing by the arithmetic processing unit 16.

  Then, as a result of detecting a portion having a high peak value of the amplitude of the horizontal signal or vertical signal, it is determined whether or not a point at which the peak value is a peak is detected (step S43). If a peak is detected, the process is terminated. If not detected, the lens control unit 17 determines the rotation direction of the projection lens 12 according to the calculation data from the calculation processing unit 16 (step S44), and outputs a command signal based on the determination to the projection lens driving unit 13. The projection lens driving unit 13 drives the projection lens 12 in accordance with a command signal from the lens control unit 17 (step S45). Then, when the focus adjustment of the projection lens 12 is performed again, the process returns to step S41 and the same processing is performed. Also in the case of the projection lens, in step S43, when it is determined that the peak is detected as a result of repeated focus detection, the focus adjustment of the projection lens 12 is terminated.

(Embodiment 2)
FIG. 8 is a diagram for explaining the configuration of another embodiment of the projection type display apparatus of the present invention. In FIG. 8, the projection display apparatus 41 performs an adjustment start button 51 for inputting an instruction to start the focus adjustment, a projection lens 52 capable of performing focus adjustment, and a focus adjustment of the projection lens 52. A projection lens driving unit 53 that drives the projection lens 52, a sensor camera 54 installed on the front surface of the projection display device, a camera lens 55 of the sensor camera 54 that can perform focus adjustment, and a camera lens 55 are driven. A camera lens driving unit 56 that adjusts the focus of the camera lens 55, a focus detection unit 57 that detects the focus of an image input by the sensor camera 54, an arithmetic processing unit 58 that calculates detection data of the focus detection unit 57, The projection lens 52 and the camera lens according to the calculation data by the calculation processing unit 58 5, a lens control unit 59 that determines the rotation direction of 5, a pattern generation unit 60 that generates a test pattern, and a video output unit 61 for projecting the test pattern generated by the pattern generation unit 60. An image is projected onto the screen 42 by the light of the light source 62 included in 61.

  In the focus adjustment of the projection display device, first, the projector is installed so that an image can be projected from the projection display device body onto the screen, the image is projected from the projection display device on the screen, and the focus adjustment of the projection display device is performed. Start. The focus adjustment is started when the operator presses an adjustment start button 51 provided on the main body of the projection display device 41. Further, focus adjustment may be started by remote operation from a remote controller (not shown).

FIG. 9 is a diagram illustrating an example of a test pattern for focus detection. When the adjustment start button 51 is pressed by the operator, the pattern generation unit 60 generates a test pattern 70 for focus detection, the video output unit 61 outputs an image of the test pattern 70, and is projected onto the screen 42 by the projection lens 52. A test pattern 70 is projected.
The focus detection test pattern 70 shown in FIG. 2 is formed by a white cross patch with a black background. Such a test pattern 70 is not limited to the form shown in FIG. 9, but it is desirable that the test pattern 70 has a form in which a change in luminance is large in horizontal scanning or vertical scanning of a projected image.

  After projecting the test pattern 70, focus adjustment of the camera lens 55 and the projection lens 52 is started. First, the focus adjustment of either the camera lens 55 or the projection lens 52 is performed. At this time, while the focus of one of the camera lens 55 and the projection lens 52 is being adjusted, the other lens is fixed. For example, when the focus adjustment of the camera lens 55 is performed first, the focus adjustment of the camera lens is performed with the focus position of the projection lens 52 fixed.

  The lens to be operated first may be either the camera lens 55 or the projection lens 52, but here the camera lens 55 is first operated. The test pattern 70 projected from the projection display device 1 forms an image on the screen 42 to generate a projected image. Then, the sensor camera 54 receives the reflected light on the screen and images the projection screen.

  A projection image of the test pattern 70 captured by the sensor camera 54 is input to the focus detection unit 57. The focus detection unit 57 analyzes the captured image data of the test pattern 70 and detects a place where the peak value of the amplitude of the horizontal signal or the vertical signal is high, or the presence or absence of a higher-order frequency component by Fourier series expansion. The focus detection result in the focus detection unit 57 is processed by the calculation processing unit 58.

Then, the lens control unit 59 determines the rotation direction of the camera lens 55 according to the calculation data from the calculation processing unit 58 and outputs a command signal based on the determination to the camera lens driving unit 56. The camera lens driving unit 56 is configured by an electric motor or the like, and rotates the camera lens 55 according to a command signal from the lens control unit 59. Further, focus detection by the focus detection unit 57 is performed.
Thus, the above process is repeated so that the best focus point of the camera lens 55 is set.
FIG. 10 is a diagram for explaining the relationship between the lens position and the luminance change. The position of the lens position at which the luminance value reaches the peak shown in FIG. 10 is the best focus of the camera lens.
If the best focus point of the camera lens 55 can be detected, the focus adjustment of the camera lens 55 is terminated and the camera lens 55 is fixed.

  Then, the focus of the projection lens 52 is adjusted. The focus adjustment of the projection lens 52 is also executed by the same operation as the focus adjustment of the camera lens 55 as described above. That is, the projection image of the test pattern 70 captured by the sensor camera 54 is input to the focus detection unit 57. The focus detection unit 57 analyzes the captured image data of the test pattern 70 and detects a place where the peak value of the amplitude of the horizontal signal or the vertical signal is high, or the presence or absence of a higher-order frequency component by Fourier series expansion. Then, the detection result in the focus detection unit 57 is arithmetically processed by the arithmetic processing unit 58.

  Then, the lens control unit 59 determines the rotation direction of the projection lens 52 according to the calculation data from the calculation processing unit 58 and outputs a command signal based on the determination to the projection lens driving unit 53. The projection lens driving unit 53 is configured by an electric motor or the like, and rotates the projection lens 52 according to a command signal from the lens control unit 59. Further, focus detection by the focus detection unit 57 is performed. Thus, the above processing is repeated so that the best focus point of the projection lens 52 is set. The best focus point in the projection lens 52 can be detected from the position where the luminance reaches a peak as shown in FIG.

  After detecting the best focus point of the projection lens 52 by the operation as described above, the projection lens 52 is fixed again, and the focus adjustment of the camera lens 55 is performed again by the same processing. For example, in the initial state, if the projection lens 52 is not in focus when the focus adjustment of the camera lens 55 is performed for the first time, the peak value of the peak value with respect to the lens position is low in the focus adjustment of the camera lens 55, and the luminance change Therefore, the focus adjustment accuracy may be lowered. Therefore, by adjusting the focus of the camera lens 55 again after the best focus point of the projection lens 52 is detected, it is possible to perform an adjustment with higher accuracy than the first adjustment. Then, after the best focus point of the camera lens 55 is detected, the focus adjustment of the projection lens 52 is performed again.

  By repeating the operation as described above, the accuracy of focus adjustment of the camera lens 55 and the projection lens 52 becomes better than that before the adjustment. Then, this operation is repeated, and the position where there is no difference in peak value compared to the previous focus adjustment is the optimum focus position for both lenses. That is, the optimum focus position can be obtained by repeating until the peak value of the luminance change of each lens does not change even when the focus adjustment is performed and is almost saturated.

FIG. 11 is a flowchart for explaining an example of the focus adjustment operation in the projection display apparatus of the present invention. The focus adjustment operation in the projection display apparatus will be described according to the flow of FIG. 11 with reference to FIGS.
First, when focus adjustment is started, the pattern generation unit 60 generates a test pattern 70 (step S51), the video output unit 61 outputs the test pattern 70, and the test pattern 70 is applied to the screen 42 by the projection lens 52. Projection is performed (step S52).

  Then, the focus adjustment of the camera lens 55 is performed (step S53), and then the focus adjustment of the projection lens 52 is performed (step S54). Then, the focus adjustment of the camera lens 55 in step S53 and the focus adjustment of the projection lens 52 in step S54 are alternately repeated, and when the difference between the detected values before and after the focus adjustment becomes a predetermined threshold value or less, that is, each lens. The focus adjustment is terminated when the peak value of the luminance change becomes saturated without substantially changing even if the focus adjustment is performed. As described above, the focus adjustment performed first may be the projection lens 52 instead of the camera lens 55. The focus adjustment of the camera lens 55 (step S53) and the focus adjustment of the projection lens 52 (step S54) may be performed in reverse order.

  FIG. 12 is a flowchart for more specifically explaining the focus adjustment operation of the camera lens 55 in step S53 in FIG. First, when performing the focus adjustment of the camera lens 55 in step S53, the focus of the test pattern 70 projected on the screen 42 is imaged by the sensor camera 54 (step S61). Then, the captured test pattern 70 is detected by the focus detection unit 57 (step S62). Here, the captured image data of the test pattern 70 is analyzed to detect a portion having a high peak value of the amplitude of the horizontal signal or the vertical signal, and the detection result is arithmetically processed by the arithmetic processing unit 58.

  Then, as a result of detecting a portion having a high peak value of the amplitude of the horizontal signal or vertical signal, it is determined whether or not a point at which the peak value is a peak is detected (step S63). If a peak is detected, the process is terminated. If not detected, the lens control unit 59 determines the rotation direction of the camera lens 55 according to the calculation data from the calculation processing unit 58 (step S64), and outputs a command signal based on the determination to the camera lens driving unit 56. The camera lens driving unit 56 drives the camera lens 55 in accordance with a command signal from the lens control unit 59 (step S65). When the camera lens focus adjustment is performed again, the process returns to step S61 to perform the same processing.

  As described above, the focus adjustment of the camera lens 55 of the sensor camera 54 and the focus adjustment of the projection lens 52 are alternately performed repeatedly, and the position at which the peak value with respect to the lens position reaches a peak is determined as the best focus of the camera lens. The focus adjustment ends. Therefore, in step S63, when it is determined that the peak has been detected as a result of repeated focus detection, the focus adjustment is terminated.

  FIG. 13 is a flowchart for more specifically explaining the focus adjustment operation of the projection lens 52 in step S54 in FIG. First, when performing the focus adjustment of the projection lens 52 in step S54, the test pattern 70 projected on the screen 42 is imaged by the sensor camera 54 (step S71). Then, the focus of the captured test pattern 70 is detected by the focus detection unit 57 (step S72). Here, the captured image data of the test pattern 70 is analyzed to detect a portion having a high peak value of the amplitude of the horizontal signal or the vertical signal, and the detection result is arithmetically processed by the arithmetic processing unit 58.

  Then, as a result of detecting a portion having a high peak value of the amplitude of the horizontal signal or vertical signal, it is determined whether or not a point at which the peak value is a peak is detected (step S73), and if a peak is detected, the process is terminated. If not detected, the lens control unit 59 determines the rotation direction of the projection lens 52 according to the calculation data from the calculation processing unit 58 (step S74), and outputs a command signal based on the determination to the projection lens driving unit 53. The projection lens driving unit 53 drives the projection lens 52 in accordance with a command signal from the lens control unit 19 (step S75). Then, when the focus adjustment of the projection lens 52 is performed again, the process returns to step S71 and the same processing is performed. Also in the case of the projection lens, in step S73, when it is determined that the peak is detected as a result of repeated focus detection, the focus adjustment of the projection lens 52 is terminated.

It is a figure for demonstrating the structure of one Example of the projection type display apparatus of this invention. It is a figure for demonstrating the structure of one Example of the sensor camera used for the projection type display apparatus of this invention. It is a figure which shows an example of the test pattern for focus detection. It is a figure explaining the relationship between a lens position and a luminance change. It is a flowchart for demonstrating an example of the focus adjustment operation | movement in the projection type display apparatus of this invention. 6 is a flowchart for more specifically explaining the focus adjustment operation of the sensor camera in step S3 in FIG. 6 is a flowchart for more specifically explaining the operation of adjusting the focus of the projection lens in step S4 in FIG. It is a figure for demonstrating the structure of the other Example of the projection type display apparatus of this invention. It is a figure which shows an example of the test pattern for focus detection. It is a figure explaining the relationship between a lens position and a luminance change. It is a flowchart for demonstrating an example of the focus adjustment operation | movement in the projection type projector of this invention. 12 is a flowchart for more specifically explaining the camera lens focus adjustment operation in step S53 in FIG. 12 is a flowchart for more specifically describing the operation of adjusting the focus of the projection lens in step S54 in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Projection type display apparatus (projector), 2 ... Screen, 11 ... Adjustment start button, 12 ... Projection lens, 13 ... Projection lens drive part, 14 ... Sensor camera, 15 ... Focus detection part, 16 ... Calculation processing part, 17 DESCRIPTION OF SYMBOLS ... Lens control part, 18 ... Pattern generation part, 19 ... Image | video output part, 20 ... Light source, 21 ... Camera lens, 22 ... Camera lens drive part, 23 ... Sensor, 24 ... Camera AF adjustment part, 25 ... Camera AF lock control , 30 ... test pattern, 41 ... projection display device (projector), 42 ... screen, 51 ... adjustment start button, 52 ... projection lens, 53 ... projection lens drive unit, 54 ... sensor camera, 55 ... camera lens, 56 ... Camera lens drive unit, 57 ... Focus detection unit, 58 ... Calculation processing unit, 59 ... Lens control unit, 60 ... Pattern generation unit, 61 ... Video Power unit, 62 ... light source, 70 ... test pattern.

Claims (9)

A projection lens that can perform focus adjustment, a sensor camera that captures an image projected by the projection lens, a focus detection unit that detects the focus of the image captured by the sensor camera, and a detection that is detected by the focus detection unit A calculation processing unit that calculates the detection result, a lens control unit that determines a rotation direction of the projection lens according to a result calculated by the calculation processing unit, and a projection that rotationally drives the projection lens according to the determination of the lens control unit A projection display apparatus that automatically adjusts the focus of the projection lens by rotationally driving the projection lens by the projection lens driving unit.
The sensor camera includes a camera lens that can perform focus adjustment, a camera lens driving unit that rotationally drives the camera lens to perform focus adjustment of the camera lens, and a camera that automatically performs focus adjustment of the camera lens. An AF adjustment unit and a camera AF lock control unit for fixing the focus position of the camera lens, and the lens control unit controls the camera AF lock control unit to fix the focus position of the camera lens. A projection type display device that adjusts the focus of the projection lens by driving the projection lens drive unit with the projection lens drive unit
The projection display device includes a pattern generation unit that generates a test pattern for performing focus adjustment, and a video output unit that outputs a video to project the test pattern generated by the pattern generation unit, The focus detection unit automatically adjusts the focus of the projection lens by detecting the focus of the test pattern imaged by the sensor camera of the test pattern projected by the projection lens,
With the lens control unit controlling the camera AF lock control unit and fixing the focus position of the camera lens, the projection lens drive unit drives the projection lens drive unit to adjust the focus of the projection lens. The camera AF adjustment unit automatically performs the focus adjustment of the camera lens with the first operation performed and the lens control unit controlling the projection lens driving unit to fix the focus position of the projection lens. The projection type display device characterized in that the second operation is alternately and repeatedly performed a plurality of times . The projection display device according to claim 1 , wherein the camera AF adjustment unit automatically adjusts the focus of the camera lens by detecting a focus of a test pattern imaged by the sensor camera. Projection type display device. 3. The projection type display device according to claim 1 , wherein a first operation for adjusting a focus of the projection lens in a state where a focus adjustment position of the camera lens is fixed, and a focus position of the projection lens is fixed. The second operation of adjusting the focus of the camera lens in a state where the focus is detected is alternately repeated until a difference between detection results of the focus detection unit in a previous operation and a current operation becomes a predetermined threshold value or less. Projection type display device. Have exploited Merarenzu also a sensor function in addition to at least a projection lens, in the automatic focus adjustment method of a projection display device that performs automatic focus adjustment of the projection type display device by detecting the focus of the projection image by the camera lens,
Automatic focus adjustment including steps of fixing the focus position of the camera lens and driving the projection lens to automatically adjust the focus of the projection lens by AF lock control for fixing the focus position of the camera lens A method,
The step of automatically adjusting the focus of the projection lens by detecting the focus of the test pattern for performing the focus adjustment projected from the projection lens of the projection display device, and performing the focus adjustment automatically And a step of fixing the focus position of the camera lens, driving the projection lens to adjust the focus of the projection lens, and fixing the focus position of the projection lens. An automatic focus adjustment method for a projection display device, wherein the second step of automatically adjusting the focus of a lens is alternately and repeatedly performed a plurality of times . 5. The automatic focus adjustment method for a projection display device according to claim 4 , wherein a first step of adjusting the focus of the projection lens in a state where the focus position of the camera lens is fixed, and a focus position of the projection lens are determined. The second step of adjusting the focus of the camera lens in a fixed state is repeated alternately until the difference between the detection results of the focus detection unit in the previous step and the current step becomes a predetermined threshold value or less. An automatic focus adjustment method for a projection type display device. A projection lens that can perform focus adjustment, a sensor camera that captures an image projected by the projection lens, a focus detection unit that detects the focus of the image captured by the sensor camera, and a detection that is detected by the focus detection unit A calculation processing unit that calculates the detection result, a lens control unit that determines a rotation direction of the projection lens according to a result calculated by the calculation processing unit, and a projection that rotationally drives the projection lens according to the determination of the lens control unit A projection display device that automatically adjusts the focus of the projection lens by rotationally driving the projection lens by the projection lens driving unit.
The sensor camera includes a camera lens that can perform focus adjustment, and a camera lens driving unit that rotationally drives the camera lens to perform focus adjustment of the camera lens, and the lens control unit includes the arithmetic processing By driving the camera lens driving unit according to the result calculated by the unit, it is a projection display device that can automatically perform the focus adjustment of the camera lens ,
A pattern generation unit that generates a test pattern for performing focus adjustment, and a video output unit that outputs a video to project the test pattern generated by the pattern generation unit,
The focus detection unit automatically adjusts the focus of the projection lens and the camera lens by detecting the focus of the test pattern projected by the projection lens and imaged by the sensor camera,
The lens control unit performs an operation for adjusting the focus by driving the other lens with the focus position of one of the camera lens and the projection lens being fixed, for each lens. A projection type display device, which is alternately performed a plurality of times . 7. The projection display device according to claim 6 , wherein the lens control unit performs an operation of performing focus adjustment by driving the other lens in a state in which the focus position of the one lens is fixed as a previous operation. A projection-type display device that repeats until a difference between detection results of the focus detection unit becomes a predetermined threshold value or less in this operation. Have exploited Merarenzu also a sensor function in addition to at least a projection lens, in the automatic focus adjustment method of a projection display device that performs automatic focus adjustment of the projection type display device by detecting the focus of the projection image by the camera lens, When performing the focus adjustment of one lens of the projection lens and the camera lens, a step of performing the focus adjustment by fixing a lens other than the lens for performing the focus adjustment, and performing the focus adjustment. And a step of adjusting the focus of the other lens, and a method of automatically adjusting the focus of all the lenses included in the projection display device.
The focus adjustment of the projection display device is performed automatically by detecting the focus of the test pattern for performing the focus adjustment projected from the projection lens of the projection display device,
The operation of performing focus adjustment by driving the other lens while the focus position of one of the camera lens and the projection lens is fixed is alternately performed a plurality of times for each lens. A method for automatically adjusting a focus of a projection display device. 9. The automatic focus adjustment method for a projection display device according to claim 8 , wherein the focus adjustment performed on each lens is performed until a difference between detection results of the focus detection unit in a previous and current focus adjustment becomes a predetermined threshold value or less. An automatic focus adjustment method for a projection display device, wherein the method is repeated alternately .

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