JP5849832B2 - Projection device - Google Patents

Description

The present invention relates to a projection equipment for projecting an image onto a projection medium.

  2. Description of the Related Art Conventionally, there is known a projection device that drives a display element based on an input image signal and projects an image related to the image signal onto a screen, a wall surface, or the like. In the conventional projection apparatus, the amount of information that can be projected has also been limited due to a limitation on the mechanism that defines the projection direction of the projection unit included in the projection apparatus or a limitation on the resolution of the display element.

  Therefore, in the conventional projection apparatus, when the resolution of the image related to the input image signal is larger than the resolution of the display element included in the projection apparatus, the information amount of the projected image is reduced and the image is projected. It was. For example, Patent Document 1 discloses a projection device that reduces the resolution of an image related to an input image signal to a resolution that can be projected by a scaler based on the resolution of a display element, and then projects the reduced image. Has been.

  In another projection apparatus, a part of the area is cut out from the image related to the input image signal, and only the image related to the cut out area is projected. For example, Patent Document 2 discloses a projector system that cuts out a partial area from the entire image and projects only an image related to the cut-out area. This projector system can project the entire image signal by so-called scrolling or the like that continuously changes the area to be cut out and projected.

JP 2007-214701 A JP 2004-086277 A

  By the way, the above-described projection device of Patent Document 1 can project the entire image related to the input image data, but displays the image on the projection medium by the image size reduction process based on the resolution reduction. The quality of the resulting image has been degraded. From another aspect, due to the image size reduction processing, the high resolution of the input image signal has been wasted.

  Further, in the above-described projection system of Patent Document 2, the area on the projection medium onto which the image related to the clipped area is projected is fixed and fixed, so that the viewer can position the subject in the entire image in the image. It was difficult to figure out.

  The present invention has been made in view of the above, and provides a projection device that can easily grasp the position of a projected subject image in an image related to image data input by a user while maintaining the resolution of the image data. The purpose is to provide.

In order to solve the problems described above, the present invention provides a projection unit (12) that converts image data into light and projects the light at a predetermined angle of view, and the projection direction of the projection unit (12) is a first projection direction. The projection angle deriving the projection angle between the projection direction changing unit (105) that changes from the first projection direction to the second projection direction, the first projection direction, and the projection direction changed by the projection direction changing unit (105). The derivation unit (104), the storage unit (101) that stores the input image data that has been input, and the image of the input image data that is stored in the storage unit (101) are displayed by the projection unit (12). when the first projection direction projects over the second projection direction, the partial region of the front Symbol storage unit (101) to said stored input image data image, and at least the angle該画The number of pixels per unit angle corresponding to the variable part of the angle and the previous The cutout image data cut out on the basis of the projection angle, the projection portion (12) to provide a projection apparatus (1), characterized in that it comprises an image clipping unit for generating as the image data to be projected (100) .
Also, the image clipping unit of the projection apparatus (1) (100), as the projection direction is changed to the second projection direction from the first projection direction, projection surface from said projection unit (12) When the distance to the image data becomes large, a reduction process based on the projection angle may be performed for each pixel of the cut-out image data.
In addition, the image cutout unit (100) of the projection device (1) has the projection direction (12) to the projection surface as the projection direction changes from the first projection direction to the second projection direction. When the distance becomes smaller, an enlargement process based on the projection angle may be performed for each pixel of the cut-out image data.

  ADVANTAGE OF THE INVENTION According to this invention, the projection apparatus which is easy to grasp | ascertain the position of the projected subject image in the image based on the input image data can be provided, maintaining the resolution which image data has.

FIG. 1 is a schematic diagram illustrating an appearance of an example of a projector device applicable to the embodiment. FIG. 2 is a schematic diagram illustrating an exemplary configuration for rotationally driving the drum unit. FIG. 3 is a schematic diagram for explaining each posture of the drum portion. FIG. 4 is a block diagram illustrating a configuration example of the circuit unit and the optical engine unit. FIG. 5 is a schematic diagram schematically illustrating a process of extracting image data stored in the memory. FIG. 6 is a schematic diagram illustrating an example of specifying a cutout region when the drum unit is at the initial position. FIG. 7 is a schematic diagram for explaining the setting of the cutout region with respect to the projection angle θ. FIG. 8 is a schematic diagram for explaining the designation of the cutout region when optical zoom is performed. FIG. 9 is a schematic diagram for explaining a case where an offset is given to the projection position of an image. FIG. 10 is a schematic diagram for explaining an image projected onto a vertical plane. FIG. 11 is a schematic diagram for explaining an image projected onto a vertical plane. FIG. 12 is a schematic diagram for explaining memory access control. FIG. 13 is a schematic diagram for explaining memory access control. FIG. 14 is a schematic diagram for explaining memory access control. FIG. 15 is a schematic diagram for explaining memory access control. FIG. 16 is a schematic diagram for explaining memory access control. FIG. 17 is a schematic diagram for explaining memory access control. FIG. 18 is a flowchart of an example showing a flow of processing when an image based on image data is projected in the projector apparatus.

  DESCRIPTION OF EMBODIMENTS Preferred embodiments of a projection apparatus and a projection method according to the present invention will be described below with reference to the drawings. Specific numerical values and appearance configurations shown in the embodiments are merely examples for facilitating understanding of the present invention, and do not limit the present invention unless otherwise specified. Detailed explanation and illustration of elements not directly related to the present invention are omitted.

<Appearance of projection device>
FIG. 1 is a diagram showing an example of the appearance of a projection apparatus (projector apparatus) 1 according to an embodiment of the present invention. 1A is a perspective view of the projector device 1 viewed from the first surface side where the operation unit is provided, and FIG. 1B is a perspective view of the projector device 1 viewed from the second surface side facing the operation unit. FIG. The projector device 1 includes a drum unit 10 and a base 20. The drum unit 10 is a rotating body that can be rotationally driven with respect to the base 20. The base 20 includes a support unit that rotatably supports the drum unit 10, and a circuit unit that performs various controls such as rotation drive control and image processing control of the drum unit 10.

  The drum unit 10 is rotatably supported by a rotation shaft (not shown) made of a bearing or the like provided inside the side plate parts 21a and 21b that are a part of the base 20. Inside the drum unit 10, a light source, a display element that modulates light emitted from the light source according to image data, a drive circuit that drives the display element, and an optical system that projects the light modulated by the display element to the outside And an optical engine section including a cooling means using a fan or the like for cooling the light source or the like.

  The drum unit 10 is provided with windows 11 and 13. The window part 11 is provided so that the light projected from the projection lens 12 of the optical system described above is irradiated to the outside. The window 13 is provided with a distance sensor that derives the distance to the projection medium using, for example, infrared rays or ultrasonic waves. In addition, the drum unit 10 includes an intake / exhaust port 22a for performing intake / exhaust for heat dissipation by the fan.

  Inside the base 20, various substrates and power supply units of the circuit unit, a driving unit for rotationally driving the drum unit 10, and the like are provided. The rotation driving of the drum unit 10 by this driving unit will be described later. On the first surface side of the base 20, the projector device 1 uses an operation unit 14 for a user to input various operations to control the projector device 1 and a remote control commander (not shown). And a receiving unit 15 for receiving a signal transmitted from the remote control commander when the remote control is performed. The operation unit 14 includes various operators that receive user operation inputs, a display unit for displaying the state of the projector device 1, and the like.

  Intake and exhaust ports 16a and 16b are provided on the first surface side and the second surface side of the base 20, respectively, and are driven to rotate so that the intake and exhaust ports 22a of the drum portion 10 face the base 20 side. Even when taking the above, it is used for intake or exhaust so as not to lower the heat radiation efficiency in the drum unit 10. The intake / exhaust port 17 provided on the side surface of the casing performs intake / exhaust for heat dissipation of the circuit unit.

<Drum section rotation drive>
FIG. 2 is a diagram for explaining the rotational driving of the drum unit 10 by the driving unit 32 provided on the base 20. FIG. 2A is a diagram illustrating a configuration of the drum 30 in a state where the cover of the drum unit 10 and the like are removed, and the driving unit 32 provided on the base 20. The drum 30 is provided with a window portion 34 corresponding to the window portion 11 and a window portion 33 corresponding to the window portion 13. The drum 30 has a rotating shaft 36, and is attached to the bearing 37 using a bearing provided on the support portions 31 a and 31 b by the rotating shaft 36 so as to be rotationally driven.

  On one surface of the drum 30, a gear 35 is provided on the circumference. The drum 30 is rotationally driven through the gear 35 by the drive unit 32 provided in the support unit 31b. The protrusions 46 a and 46 b on the inner peripheral portion of the gear 35 are provided for detecting the start point and the end point of the rotation operation of the drum 30.

  FIG. 2B is an enlarged view for showing the configuration of the drive unit 32 provided on the drum 30 and the base 20 in more detail. The drive unit 32 includes a motor 40, a worm gear 41 that is directly driven by the rotation shaft of the motor 40, gears 42 a and 42 b that transmit the rotation by the worm gear 41, and the rotation transmitted from the gear 42 b to the gear of the drum 30. And a gear group including a gear 43 that transmits to 35. By transmitting the rotation of the motor 40 to the gear 35 by this gear group, the drum 30 can be rotated according to the rotation of the motor 40. As the motor 40, for example, a stepping motor that performs rotation control for each predetermined angle by a drive pulse can be applied.

  Photo interrupters 51a and 51b are provided for the support portion 31b. The photo interrupters 51a and 51b detect protrusions 46b and 46a provided on the inner periphery of the gear 35, respectively. Output signals from the photo interrupters 51a and 51b are supplied to a rotation control unit 104 described later. In the embodiment, when the protrusion 46b is detected in the photo interrupter 51a, the rotation control unit 104 determines that the posture of the drum 30 has reached the end point of the rotation operation. Further, when the protrusion 46a is detected on the photo interrupter 51b, the rotation control unit 104 determines that the posture of the drum 30 is the posture that has reached the starting point of the rotation operation.

  Hereinafter, from the position where the protrusion 46a is detected on the photo interrupter 51b to the position where the protrusion 46b is detected on the photo interrupter 51a, the direction in which the drum 30 rotates through the arc having the longer length on the circumference of the drum 30 Is the positive direction. That is, the rotation angle of the drum 30 increases in the positive direction.

  In the embodiment, the photointerrupter 51b has a photointerrupter 51b so that an angle between the rotation axis 36 between the detection position where the photointerrupter 51b detects the protrusion 46a and the detection position where the photointerrupter 51a detects the protrusion 46b is 270 °. 51a and 51b and protrusions 46a and 46b are arranged, respectively.

  For example, when a stepping motor is applied as the motor 40, the attitude of the drum 30 is specified based on the detection timing of the protrusion 46a by the photo interrupter 51b and the number of drive pulses for driving the motor 40, and the projection by the projection lens 12 is performed. The angle can be determined.

  The motor 40 is not limited to a stepping motor, and for example, a DC motor can be applied. In this case, for example, as shown in FIG. 2B, a code wheel 44 that rotates together with the gear 43 is provided on the same axis with respect to the gear 43, and photo reflectors 50a and 50b are provided on the support portion 30b. The rotary encoder is configured.

  The code wheel 44 is provided with, for example, a transmission part 45a and a reflection part 45b whose phases are different in the radial direction. By receiving the reflected light of each phase from the code wheel 44 by the photo reflectors 50a and 50b, the rotational speed and direction of the gear 43 can be detected. Based on the detected rotation speed and rotation direction of the gear 43, the rotation speed and rotation direction of the drum 30 are derived. Based on the derived rotation speed and rotation direction of the drum 30 and the detection result of the protrusion 46b by the photo interrupter 51a, the posture of the drum 30 can be specified and the projection angle by the projection lens 12 can be obtained.

  In the configuration as described above, the initial posture of the drum unit 10 is a posture in which the projection direction by the projection lens 12 is directed in the vertical direction. Therefore, in the initial state, the projection lens 12 is completely hidden by the base 20. FIG. 3A shows the state of the drum unit 10 in the initial posture. In the embodiment, the protrusion 46a is detected on the photo interrupter 51b in this initial posture, and the rotation control unit 104 described later determines that the drum 30 has reached the starting point of the rotation operation.

  In the following description, unless otherwise specified, “the direction of the drum unit 10” and “the angle of the drum unit 10” are synonymous with “the projection direction by the projection lens 12” and “the projection angle by the projection lens 12”, respectively. And

  When the projector device 1 is activated, for example, the driving unit 32 starts rotating the drum unit 10 so that the projection direction by the projection lens 12 faces the first surface side. Thereafter, the drum unit 10 is rotated to a position where the direction of the drum unit 10, that is, the projection direction by the projection lens 12 becomes horizontal on the first surface side, and the rotation is temporarily stopped. The projection angle of the projection lens 12 when the projection direction by the projection lens 12 is horizontal on the first surface side is defined as a projection angle of 0 °. FIG. 3B shows the posture of the drum unit 10 (projection lens 12) when the projection angle is 0 °. Hereinafter, the posture of the drum unit 10 (projection lens 12) having the projection angle θ is referred to as the θ posture with reference to the posture of the projection angle 0 °.

  For example, assume that image data is input in a 0 ° posture and the light source is turned on. In the drum unit 10, the light emitted from the light source is modulated in accordance with the image data by the display element driven by the drive circuit and is incident on the optical system. Then, the light modulated according to the image data is projected in the horizontal direction from the projection lens 12 and irradiated onto a non-projection medium such as a screen or a wall surface.

  The user can rotate the drum unit 10 around the rotation shaft 36 while operating the operation unit 14 or the like while performing projection from the projection lens 12 using image data. For example, the drum unit 10 is rotated in the positive direction from the 0 ° posture to set the rotation angle to 90 ° (90 ° posture), and the light from the projection lens 12 is projected vertically upward with respect to the bottom surface of the base 20. it can. FIG. 3C shows the posture of the drum unit 10 in the posture when the projection angle θ is 90 °, that is, in the 90 ° posture.

  The drum unit 10 can be further rotated in the forward direction from the 90 ° posture. In this case, the projection direction of the projection lens 12 changes from the upward direction perpendicular to the bottom surface of the base 20 to the second surface side. FIG. 3D shows a state where the drum unit 10 is further rotated in the positive direction from the 90 ° posture of FIG. 3C, and is in a posture when the projection angle θ is 180 °, that is, a 180 ° posture. In the projector device 1 according to the embodiment, the protrusion 46b is detected on the photo interrupter 51a in this 180 ° attitude, and the rotation control unit 104 described later determines that the end point of the rotation operation of the drum 30 has been reached.

  Although details will be described later, the projector device 1 according to the present embodiment rotates the drum unit 10 as shown in FIGS. 3B to 3D while performing projection, for example, to thereby project the projection lens. The projection area in the image data can be changed (moved) according to the projection angle by 12. As a result, the content of the projected image, the change in the projection position of the projected image on the projection medium, and the content and position of the image area cut out as an image to be projected in the entire image area related to the input image data It is possible to correspond to the change of. Therefore, the user can intuitively grasp which area of all the image areas related to the input image data is projected based on the position of the projected image on the projection medium, and the projected image. It is possible to intuitively perform operations for changing the contents of the.

  Further, the optical system includes an optical zoom mechanism, and the size when the projected image is projected onto the projection medium can be enlarged or reduced by an operation on the operation unit 14. Hereinafter, the enlargement / reduction of the size when the projection image by the optical system is projected onto the projection medium may be simply referred to as “zoom”. For example, when the optical system performs zooming, the projected image is enlarged / reduced around the optical axis of the optical system at the time when the zooming is performed.

  When the user ends the projection of the projection image by the projector device 1 and performs an operation for instructing the operation unit 14 to stop the projector device 1, the projector device 1 is stopped. First, the drum unit 10 returns to the initial posture. The rotation is controlled. When it is detected that the drum unit 10 is directed in the vertical direction and returned to the initial posture, the light source is turned off, and the power is turned off after a predetermined time required for cooling the light source. By turning off the power after turning the drum unit 10 in the vertical direction, it is possible to prevent the surface of the projection lens 12 from becoming dirty when not in use.

<Internal configuration of projector apparatus 1>
Next, a configuration for realizing the operation of the projector device 1 according to the embodiment as described above will be described. FIG. 4 shows an exemplary configuration of the circuit unit provided in the base 20 and the optical engine unit 110 provided in the drum unit 10 in the projector device 1.

  The optical engine unit 110 includes a light source 111, a display element 114, and a projection lens 12. The light source 111 includes, for example, three LEDs (Light Emitting Diodes) that emit red (R), green (G), and blue (B), respectively. The RGB light beams emitted from the light source 111 are irradiated to the display element 114 through optical systems (not shown).

In the following description, the display element 114 is a transmissive liquid crystal display element, and has a size of, for example, horizontal 1280 pixels × vertical 800 pixels. Of course, the size of the display element 114 is not limited to this example. The display element 114 is driven by a drive circuit (not shown), and modulates, reflects, and emits light beams of RGB colors according to image data. The RGB light beams modulated in accordance with the image data emitted from the display element 114 are incident on the projection lens 12 via an optical system (not shown) and projected outside the projector apparatus 1.
The display element 114 may be configured by a reflective liquid crystal display element using, for example, LCOS (Liquid Crystal on Silicon), or a DMD (Digital Micromirror Device). In that case, the projector apparatus is configured by an optical system and a drive circuit corresponding to a display element to be applied.

  The projection lens 12 includes a plurality of combined lenses and a lens driving unit that drives the lens in accordance with a control signal. For example, the lens driving unit performs focus control by driving a lens included in the projection lens 12 according to a result of distance measurement based on an output signal from a distance sensor provided in the window unit 13. The lens driving unit controls the optical zoom by driving the lens in accordance with a zoom command supplied from the later-described angle-of-view control unit 106 to change the angle of view.

  As described above, the optical engine unit 110 is provided in the drum unit 10 that can be rotated 360 ° by the rotation mechanism unit 105. The rotation mechanism unit 105 includes the drive unit 32 described with reference to FIG. 2 and the gear 35 that is the configuration on the drum unit 10 side, and rotates the drum unit 10 by using the rotation of the motor 40. That is, the rotation direction of the projection lens 12 is changed by the rotation mechanism unit 105.

  The circuit unit of the projector device 1 includes an image cutout unit 100, a memory 101, an image processing unit 102, an image control unit 103, a rotation control unit 104, an angle of view control unit 106, and a CPU 120. A CPU (Central Processing Unit) 120 is connected to a ROM (Read Only Memory) and a RAM (Random Access Memory) (not shown), respectively, and uses a RAM as a work memory in accordance with a program stored in the ROM in advance to project a projected image. Various processes of the projector apparatus 1 such as projection, change of the projection angle, and cropping of the image are comprehensively controlled.

  For example, the CPU 120 controls each unit of the projector device 1 according to a program based on a control signal supplied from the operation unit 14 according to a user operation. Thereby, operation | movement of the projector apparatus 1 according to user operation is attained. For example, the CPU 120 controls each unit of the projector device 1 according to a script input from a data input unit (not shown). Thereby, the automatic control of the operation of the projector device 1 can be performed.

  Image data of a still image or a moving image is input to the projector device 1 and supplied to the image cutout unit 100. The image cutout unit 100 stores the supplied image data in the memory 101. The memory 101 stores image data in units of images. That is, corresponding data is stored for each still image when the image data is still image data, and for each frame image constituting the moving image data when the image data is moving image data. The memory 101 corresponds to, for example, a digital high-definition broadcast standard, and can store one or more frame images of 1920 pixels × 1080 pixels. The image cutout unit 100 cuts out (extracts) an image region designated by the image control unit 103 from all regions of the frame image related to the image data stored in the memory 101 and outputs the image region as image data.

  The input image data is preferably preliminarily shaped into a size corresponding to the image data storage unit in the memory 101 and input to the projector apparatus 1. In this example, the input image data is input to the projector apparatus 1 after the image size is shaped in advance to 1920 pixels × 1080 pixels. However, the present invention is not limited to this, and an image shaping unit that shapes image data input in an arbitrary size into image data having a size of 1920 pixels × 1080 pixels may be provided in the preceding stage of the image clipping unit 100 of the projector device 1.

  The image data output from the image cutout unit 100 is supplied to the image processing unit 102. The image processing unit 102 performs image processing on the supplied image data using, for example, a memory (not shown). For example, the image processing unit 102 performs size conversion processing on the image data supplied from the image cutout unit 100 so that the size matches the size of the display element 114. In addition, the image processing unit 102 can perform various image processing. For example, the size conversion process for the image data can be performed using a general linear conversion process. When the size of the image data supplied from the image cutout unit 100 matches the size of the display element 114, the image data may be output as it is.

  Furthermore, a process related to so-called keystone correction can be performed on the projected image.

  Also, interpolation (oversampling) with a constant aspect ratio of the image applies an interpolation filter with a predetermined characteristic to enlarge part or all of the image, and a low-pass filter according to the reduction ratio to eliminate aliasing distortion It is also possible to reduce a part or all of the image by thinning (subsampling) over time or to keep the size as it is without applying a filter.

  In addition, when an image is projected in an oblique direction, an operator such as Laplacian (or a one-dimensional filter is applied in the horizontal and vertical directions to prevent the image from being out of focus and blurring in the periphery. The edge of the blurred image portion projected can be emphasized by performing the edge enhancement processing according to (1).

  Furthermore, in order to prevent the brightness of the entire screen from changing due to the projection size (area) being changed by the keystone correction or the like, adaptive brightness is maintained so that the brightness remains uniform. Adjustments can also be made. Then, when the peripheral portion of the projected image texture includes an oblique line, the image processing unit 102 mixes a local halftone so as not to make the edge jagged, or applies a local low-pass filter. It is possible to prevent the diagonal lines from being observed as jagged lines by blurring the edge jags.

  The image data output from the image processing unit 102 is supplied to the display element 114. In practice, this image data is supplied to a drive circuit that drives the display element 114. The drive circuit drives the display element 114 according to the supplied image data.

  The rotation control unit 104 issues an instruction to the rotation mechanism unit 105 in accordance with, for example, a command from the CPU 120 corresponding to a user operation on the operation unit 14. The rotation mechanism unit 105 includes the above-described drive unit 32 and photo interrupters 51a and 51b. The rotation mechanism unit 105 controls the drive unit 32 according to the instruction supplied from the rotation control unit 104 to control the rotation operation of the drum unit 10 (drum 30). For example, the rotation mechanism unit 105 generates a drive pulse in accordance with an instruction supplied from the rotation control unit 104 and drives the motor 40 that is, for example, a stepping motor.

  On the other hand, the rotation control unit 104 is supplied with the outputs of the above-described photointerrupters 51 a and 51 b and the drive pulse for driving the motor 40 from the rotation mechanism unit 105. The rotation control unit 104 has a counter, for example, and counts the number of drive pulses. The rotation control unit 104 acquires the detection timing of the protrusion 46a based on the output of the photo interrupter 51b, and resets the number of pulses counted by the counter at the detection timing of the protrusion 46a. The rotation control unit 104 can sequentially obtain the angle of the drum unit 10 (drum 30) based on the number of pulses counted by the counter, and can acquire the attitude (angle) of the drum unit 10. Information indicating the angle of the drum unit 10 is supplied to the image control unit 103. In this way, when the projection direction of the projection lens 12 is changed, the rotation control unit 104 can derive an angle between the projection direction before the change and the projection direction after the change.

  The angle-of-view control unit 106 issues a zoom instruction, that is, an angle-of-view change instruction to the projection lens 12 in accordance with, for example, a command from the CPU 120 according to a user operation on the operation unit 14. The lens driving unit of the projection lens 12 drives the lens according to the zoom instruction to perform zoom control. The angle-of-view control unit 106 supplies information related to the angle of view derived from the zoom instruction and the zoom magnification associated with the zoom instruction to the image control unit 103.

  The image control unit 103 designates an image cut-out region by the image cut-out unit 100 based on the information related to the angle supplied from the rotation control unit 104 and the information related to the view angle supplied from the view angle control unit 106. At this time, the image control unit 103 designates a cutout region in the image data based on a line position corresponding to an angle between projection directions before and after the change of the projection lens 12.

  In the above description, the image cutout unit 100, the image processing unit 102, the image control unit 103, the rotation control unit 104, and the angle of view control unit 106 have been described as if they were separate hardware. It is not limited to. For example, each of these units may be realized by a program module operating on the CPU 120.

<Cut out image data>
Next, a process for cutting out image data stored in the memory 101 by the image control unit 103 and the image cutout unit 100 according to the present embodiment will be described. FIG. 5 is a conceptual diagram for explaining a process for extracting image data stored in the memory 101. With reference to FIG. 5A, an example in which the image data 141 in the specified cutout area is cut out from the image data 140 stored in the memory 101 will be described.

  In the memory 101, for example, addresses are set in units of lines in the vertical direction and in units of pixels in the horizontal direction. The addresses of the lines increase from the lower end to the upper end of the image (screen), and the addresses of the pixels are from the left end of the image. It shall increase toward the right end.

The image control unit 103 addresses the line q ₀ and the line q ₁ in the vertical direction as the cut-out region of the image data 140 of Q lines × P pixels stored in the memory 101 with respect to the image cut-out unit 100, and Address pixels p ₀ and p ₁ in the direction. The image cutout unit 100 reads out each line within the range of the lines q _{0 to} q ₁ from the memory 101 in accordance with this address specification over the pixels p _{0 to} p ₁ . At this time, for example, each line is read from the upper end to the lower end of the image, and each pixel is read from the left end to the right end of the image. Details of access control to the memory 101 will be described later.

The image clipping unit 100, read from the memory 101, and supplies the line q ₀ to q _1, and the image data 141 in the range of the pixel p ₀ ~p ₁ to the image processing unit 102. The image processing unit 102 performs a size conversion process that matches the size of the image based on the supplied image data 141 with the size of the display element 114. As an example, when the size of the display element 114 is R lines × S pixels, the maximum magnification m that satisfies both the following expressions (1) and (2) is obtained. Then, the image processing unit 102 enlarges the image data 141 by this magnification m, and obtains image data 141 ′ whose size has been converted as illustrated in FIG. 5B.
m × (p ₁ −p ₀ ) ≦ S (1)
m × (q ₁ −q ₀ ) ≦ R (2)

Next, designation (update) of a cutout area according to the projection angle according to the present embodiment will be described. FIG. 6 shows an example of clip region designation when the drum unit 10 is in the 0 ° posture, that is, the projection angle is 0 °. In the projector device (PJ) 1, a projection lens 12 of the angle alpha, with respect to the projection plane 130 is a projection medium, such as a screen, the projection position in the case of projecting the image 131 ₀ a projection angle of 0 °, the projection A position Pos ₀ corresponding to the light beam center of the light projected from the lens 12 is assumed. In addition, when the projection angle is 0 °, the image data stored in the memory 101 is an image based on the image data from the line S at the lower end of the region designated in advance to perform projection with the posture of the projection angle 0 ° to the line L. Shall be projected. The region from the line S to the line L includes the number of lines ln. The number of lines ln corresponds to, for example, the number of pixels in the vertical direction of the display element 114, that is, the number of lines.

The image control unit 103 instructs the image cutout unit 100 to cut out and read lines S to L of the image data 140 stored in the memory 101. Here, in the horizontal direction, all of the image data 140 from the left end to the right end is read. In accordance with an instruction from the image control unit 103, the image cutout unit 100 sets the areas S to L of the image data 140 as cutout regions, reads the image data 141 of the set cutout regions, and supplies the image data to the image processing unit 102. . The projection surface 130, from line S of the image data 140 to the line L, the image 131 ₀ is projected by the image data 141 ₀ line number ln. In this case, the image based on the image data 142 in the area from the line L to the uppermost line in the entire area of the image data 140 is not projected.

  Next, for example, the case where the drum unit 10 is rotated by a user operation on the operation unit 14 and the projection angle of the projection lens 12 becomes the angle θ will be described. In the present embodiment, when the drum unit 10 is rotated and the projection angle by the projection lens 12 is changed, the cutout region from the memory 101 of the image data 140 is changed according to the projection angle θ.

The setting of the cut-out area with respect to the projection angle θ will be described more specifically with reference to FIG. For example, consider a case in which the projection position of the drum unit 10 is rotated in the positive direction from the 0 ° posture and the projection angle of the projection lens 12 becomes an angle θ (> 0 °). In this case, the projection position with respect to the projection surface 130 moves to the upper projection position Pos ₁ with respect to the projection position Pos ₀ with a projection angle of 0 °. At this time, the image control unit 102 specifies the cutout region for the image data 140 stored in the memory 101 to the image cutout unit 100 according to the following expressions (3) and (4). Expression (3) indicates the line R _S at the lower end of the cutout area, and Expression (4) indicates the line R _L at the upper end of the cutout area.
R _S = θ × (ln / α) + S (3)
R _L = θ × (ln / α) + S + ln (4)

  In the expressions (3) and (4), the value ln indicates the number of lines included in the projection area (for example, the number of lines of the display element 114). Further, the value α indicates the angle of view of the projection lens 12, and the value S indicates the line at the lower end of the cutout region in the 0 ° posture described with reference to FIG.

  In the expressions (3) and (4), (ln / α) represents the number of lines included in the angle of view α. In other words, (ln / α) indicates the number of lines per unit angle in the projector device 1. Therefore, θ × (ln / α) represents the number of lines corresponding to the angle θ in the projector device 1. That is, Expressions (3) and (4) correspond to changes in the read address (line) with respect to the memory 101 when the projection angle changes by the angle θ with respect to the 0 ° attitude (angle θ = 0 °). .

As described above, in the present embodiment, an address for reading the image data 140 from the memory 101 is designated according to the projection angle θ. As a result, the image data 141 _{1 at the} position corresponding to the projection angle θ of the image data 140 is read from the memory 101, and the image 131 ₁ related to the read image data 141 ₁ is the projection angle of the projection plane 130. Projection is performed at a projection position Pos ₁ corresponding to θ.

  Therefore, according to the present embodiment, when image data 140 having a size larger than the size of the display element 114 is projected, the correspondence between the position in the projected image and the position in the image data is maintained. . Further, since the projection angle θ is obtained based on the drive pulse of the motor 40 for driving the drum 30 to rotate, the projection angle θ can be obtained with substantially no delay with respect to the rotation of the drum unit 10. It is possible to obtain the projection angle θ without being affected by the projected image and the surrounding environment.

  Next, the setting of the cut-out area when the optical zoom by the projection lens 12 is performed will be described. As already described, in the case of the projector device 1, optical zooming is performed by driving the lens driving unit and increasing or decreasing the angle of view α of the projection lens 12. An increase in the angle of view due to the optical zoom is defined as an angle Δ, and an angle of view of the projection lens 12 after the optical zoom is defined as an angle of view (α + Δ).

  In this case, even if the angle of view increases due to the optical zoom, the cutout area for the memory 101 does not change. In other words, the number of lines included in the projected image with the angle of view α before the optical zoom and the number of lines included in the projected image with the angle of view (α + Δ) after the optical zoom are the same. Therefore, after the optical zoom, the number of lines included per unit angle changes before the optical zoom.

The designation of the cut-out area when optical zoom is performed will be described more specifically with reference to FIG. In the example of FIG. 8, optical zoom is performed to increase the angle of view Δ by the angle of view α in the state of the projection angle θ. By performing the optical zoom, the projected image projected on the projection plane 130, for example as a common light beam center of the light projected to the projection lens 12 (projection position Pos _2), as shown as image 131 _2, optical The angle of view is enlarged by Δ relative to the case where zooming is not performed.

When the optical zoom for the angle of view Δ is performed, assuming that the number of lines designated as a cutout region for the image data 140 is ln lines, the number of lines included per unit angle is {ln / (α + Δ)}. expressed. Therefore, the cutout region for the image data 140 is specified by the following expressions (5) and (6). In addition, the meaning of each variable in Formula (5) and Formula (6) is the same as the above-mentioned Formula (3) and Formula (4).
R _S = θ × {ln / (α + Δ)} + S (5)
R _L = θ × {ln / (α + Δ)} + S + ln (6)

From the image data 140, the equation (5) and the image data 141 ₂ regions represented by the formula (6) is read, an image 131 ₂ of the image data 141 ₂ read, by the projection lens 12, projection The projection is performed on the projection position Pos _{2 of the} surface 130.

  As described above, when the optical zoom is performed, the number of lines included per unit angle changes compared to the case where the optical zoom is not performed, and the amount of change in the line with respect to the change in the projection angle θ performs the optical zoom. It will be different compared to the case without it. This is a state where the gain corresponding to the angle of view Δ increased by the optical zoom is changed in the designation of the read address corresponding to the projection angle θ with respect to the memory 101.

In the present embodiment, the address for reading the image data 140 from the memory 101 is specified according to the projection angle θ and the angle of view α of the projection lens 12. Accordingly, even when subjected to optical zoom, the address of the image data 141 ₂ to be projected, can be appropriately specified for the memory 101. Accordingly, even when optical zoom is performed, when image data 140 having a size larger than the size of the display element 114 is projected, the correspondence between the position in the projected image and the position in the image data Is preserved.

Next, the case where an offset is given to the projection position of an image will be described with reference to FIG. When the projector apparatus 1 is used, the 0 ° attitude (projection angle 0 °) is not necessarily the lowest end of the projection position. For example, as illustrated in FIG. 9, a case where the projection position Pos ₃ with a predetermined projection angle θ _ofst is set to the lowest projection position may be considered. The projection angle θ at the time of projecting an image having the lowermost line of the image data 140 as the lowermost end is set as an offset angle θ _ofst due to offset.

In this case, for example, it can be considered that the offset angle θ _ofst is regarded as a projection angle of 0 °, and a cutout region for the memory 101 is designated. When applied to the above formulas (3) and (4), the following formulas (7) and (8) are obtained. In addition, the meaning of each variable in Formula (7) and Formula (8) is the same as the above-mentioned Formula (3) and Formula (4).
R _S = (θ−θ _ofst ) × (ln / α) + S (7)
R _L = (θ−θ _ofst ) × (ln / α) + S + ln (8)

  By the way, the method for specifying the cut-out area according to the above-described formulas (3) and (4) assumes that the projection surface 130 on which the projection lens 12 projects is a cylinder centered on the rotation axis 36 of the drum unit 10. Based on a cylindrical model. However, in practice, it is considered that the projection surface 130 is often a vertical surface (hereinafter simply referred to as “vertical surface”) that forms an angle of 90 ° with respect to the projection angle θ = 0 °. When image data having the same number of lines is cut out from the image data 140 and projected onto a vertical plane, the image projected on the vertical plane extends in the vertical direction as the projection angle θ increases. Therefore, the image processing unit performs the following image processing after the cutout unit.

  An image projected on a vertical plane will be described with reference to FIGS. 10 and 11. In FIG. 10, consider a case where an image is projected from the projection lens 12 onto a projection surface W that is separated from the position B by a distance r with the position B as the position of the rotation shaft 36 of the drum unit 10.

In the above-described cylindrical model, a projection image is projected with an arc C having a radius r centered on the position B as a projection plane. Each point of the arc C is equidistant from the position B, and the light flux center of the light projected from the projection lens 12 is a radius of a circle including the arc C. Therefore, even if the projection angle θ is increased from θ ₀ of 0 ° to θ ₁ , θ ₂ ,..., The projected image is always projected on the projection surface with the same size.

On the other hand, when an image is projected from the projection lens 12 onto the projection surface W that is a vertical surface, when the projection angle θ is increased from θ ₀ to θ ₁ , θ ₂ ,. The position at which the center of the light beam is irradiated onto the projection surface W varies according to the function of the angle θ according to the characteristic of the tangent function. Therefore, the projected image extends upward in accordance with the ratio M shown in the following equation (9) as the projection angle θ increases.
M = (180 × tan θ) / (θ × π) (9)

  According to Expression (9), for example, when the projection angle θ = 45 °, the projection image is stretched at a ratio of about 1.27 times. In addition, when the projection surface W is higher than the length of the radius r and projection at the projection angle θ = 60 ° is possible, the projection is performed at a ratio of about 1.65 times at the projection angle θ = 60 °. The image will stretch.

  In addition, the line interval in the projected image on the projection surface W also increases as the projection angle θ increases, as illustrated in FIG. In this case, according to the position on the projection surface W in one projection image, the line interval is widened according to the above equation (9).

  Therefore, the projector device 1 performs a reduction process on the image data of the image to be projected at a ratio of the reciprocal of the above-described equation (9) according to the projection angle θ of the projection lens 12. The reduction processing is preferably larger than the image data cut out based on the cylindrical model. That is, depending on the height of the projection plane W, which is a vertical plane, when the projection angle θ = 45 °, the projection image is stretched at a ratio of about 1.27 times, so that it is reduced to about 78% of the reciprocal thereof. It will be. Therefore, in order to use up the image memory to the full, cut out an area larger than the area of the image data corresponding to the projected image by cutting out a large number of lines of about 22% or more in advance. It is desirable to input to the image processing unit.

  As an example, when the image control unit 103 stores the image data input to the projector device 1 in the memory 101 by the image cutout unit 100, the image control unit 103 sets the reciprocal ratio of the above equation (9) to the image data. Using the image data, a reduction process is performed on the image data in advance for each line of the image when the image data is projected. In the reduction process, the line is thinned by applying a low-pass filter of several taps to the line (vertical pixel) having a reduction rate depending on θ. To be precise, the limit value of the band of the low-pass filter must be changed depending on θ, but the characteristics of the filter can be determined uniformly with a reduction ratio corresponding to the maximum θ, or the maximum θ can be almost 1 It is possible to use general linear interpolation that uniformly determines the characteristics of a filter with a reduction ratio corresponding to / 2. In addition, after the filtering process, even in the thinned-out line, sub-sampling must be sub-sampled depending on θ in the screen, but the thinning is uniformly performed at a reduction ratio corresponding to the maximum θ, or It is also possible to perform thinning uniformly at a reduction ratio corresponding to approximately 1/2 of the maximum θ. If the low-pass filter and thinning are not performed uniformly, but are performed as accurately as possible, it is effective to obtain better characteristics by dividing the area into several areas and making them uniform only within those areas. .

  Note that the image processing using the formula (9) is not limited to being performed when image data is stored in the memory 101. This image processing may be performed by the image processing unit 102, for example.

  In an environment where the projector apparatus 1 is actually used, the height of the projection surface W is limited, and it is considered that the surface R is often formed by folding back 90 ° at a position A at a certain height. This surface R can also be used as the projection surface of the projector device 1. In this case, the image projected onto the projection surface R is further increased as the projection angle θ is increased as described above as the projection position goes beyond the position A and goes directly upward (projection angle θ = 90 °). The image is shrunk with characteristics opposite to those of the image projected on the projection surface W.

  Therefore, when an image based on image data is projected at the projection angles of 0 ° and 90 °, the reduction process using Expression (9) is not performed on the projected image data. In addition, when the length (height) of the projection surface W and the length of the projection surface R are substantially equal, the reduction process using the formula (9) for the image data to be projected is performed from the projection angle 0 ° to the projection surface. The reduction process to the uppermost point A of W and the reduction process from the point A to the projection angle of 90 ° are executed as symmetrical processes. Thereby, it is possible to reduce the load on the reduction processing in the image control unit 103.

  In the above-described example, the description has been made on the assumption that a vertical surface forms an angle of 90 ° with respect to the projection angle θ = 0 °. Depending on the rotation angle of the drum unit 10, it may be possible to project on a plane that forms an angle of 180 ° relative to the projection angle θ = 0 °. When image data having the same number of lines is cut out from the image data 140 and projected onto this surface, the projected image shrinks in the vertical direction as the projection angle θ increases. Therefore, after the cutout unit, the image processing unit performs image processing opposite to that described above.

That is, when the projection angle θ is increased from θ ₀ to θ ₁ , θ ₂ ,..., The distance from the projection unit to the projection surface changes. Therefore, the projector device 1 performs an enlargement process on the image data of the image to be projected, in accordance with the projection angle θ of the projection lens 12, contrary to the above description.

  As described above, the image cutout unit of the projection device 1 cuts out when the distance from the projection unit 12 to the projection surface becomes smaller as the projection direction changes from the first projection direction to the second projection direction. You may make it perform the expansion process based on a projection angle for every pixel of image data.

<About memory control>
Next, access control of the memory 101 will be described with reference to FIGS. For each vertical sync signal VD, the image data is transmitted in the horizontal direction on the screen for each line from the left end to the right end of the image, and each line is sequentially transmitted from the upper end to the lower end of the image. The In the following description, the case where the image data has a size of horizontal 1920 pixels × vertical 1080 pixels (lines) corresponding to the digital high vision standard will be described as an example.

Hereinafter, an example of access control in the case where the memory 101 includes four memory areas that can be independently controlled for access will be described. That is, as shown in FIG. 12, the memory 101 has a size of horizontal 1920 pixels × vertical 1080 pixels (lines), and each of the areas of the memories 101Y ₁ and 101Y ₂ used for writing / reading image data, and horizontal 1080 Each area of the memories 101T ₁ and 101T ₂ used for writing / reading image data with a size of pixel × vertical pixel 1920 (line) is provided. Hereinafter, the memories 101Y ₁ , 101Y ₂ , 101T ₁ and 101T ₂ will be described as the memory Y ₁ , the memory Y ₂ , the memory T ₁ and the memory T ₂ , respectively.

FIG. 13 is an example of a time chart for explaining access control to the memory 101 by the image cutout unit 100. 13A shows the projection angle θ of the projection lens 12, and FIG. 13B shows the vertical synchronization signal VD. 13C shows the input timing of the image data D ₁ , D ₂ ,... Input to the image cutout unit 100, and FIGS. 13D to 13G show the memories Y ₁ and Y ₂ , respectively. , An example of access from the image cutout unit 100 to T ₁ and T ₂ is shown. In FIG. 13 (d) to FIG. 13 (g), blocks marked with “R” indicate reading, and blocks marked with “W” indicate writing.

Image data D ₁ , D ₂ , D ₃ , D ₄ , D ₅ , D ₆ ,... Each having an image size of 1920 pixels × 1080 lines is input to the image cutout unit 100 for each vertical synchronization signal VD. The The image data D ₁ , D ₂ ,... Are input after the vertical synchronization signal VD in synchronization with the vertical synchronization signal VD. In addition, the projection angles of the projection lens 12 corresponding to the vertical synchronizing signals VD are set as projection angles θ ₁ , θ ₂ , θ ₃ , θ ₄ , θ ₅ , θ ₆ ,. Thus, the projection angle θ is acquired for each vertical synchronization signal VD.

First, image data D ₁ is input to the image cutout unit 100. As described above, the projector device 1 according to the present embodiment changes the projection angle θ by the projection lens 12 by rotating the drum unit 10 to move the projection position of the projection image, and also changes the image according to the projection angle θ. Specify the read position for data. Therefore, it is convenient that the image data is longer in the vertical direction. In general, image data often has a horizontal size larger than a vertical size. Therefore, for example, it is conceivable that the user rotates the camera 90 ° to take an image, and the image data obtained by this imaging is input to the projector device 1.

That is, the image by the image data D ₁ , D ₂ ,... Input to the image cutout unit 100 is an image of the correct orientation as judged from the image content, like an image 160 shown as an image in FIG. The image is a landscape image rotated 90 ° from the side.

The image clipping unit 100, the image data D ₁ inputted, first, the memory Y _1, written in the timing WD ₁ corresponding to the input timing of the image data D ₁ (timing WD ₁ in FIG. 13 (d)) . The image clipping unit 100, the image data D _1, as shown on the left side in FIG. 14 (b), and writes to the memory Y ₁ in the order of lines in a horizontal direction. On the right side of FIG. 14B, an image 161 based on the image data D ₁ thus written in the memory Y ₁ is shown as an image. The image data D ₁ is written in the memory Y ₁ as the image 161 having the same image as the image 160 at the time of input.

As shown in FIG. 14C, the image cutout unit 100 uses the image data D ₁ written in the memory Y ₁ as the start of the vertical synchronization signal VD next to the vertical synchronization signal VD into which the image data D ₁ is written. and at the same timing RD _1, read from the memory Y ₁ (timing RD ₁ in FIG. 13 (d)).

At this time, the image clipping unit 100, the image data D _1, as the starting pixel readout in the lower left corner of the pixel of the image, will read for each pixel across lines sequentially in the vertical direction. When the pixel at the upper end of the image is read out, each pixel is read out in the vertical direction with the next pixel to the right of the pixel at the reading start position in the vertical direction as the read start pixel. This operation is repeated until the readout of the pixel at the upper right corner of the image is completed.

In other words, the image cutout unit 100 sets the line direction as the vertical direction from the lower end to the upper end of the image, and reads the image data D ₁ from the memory Y ₁ from the left end of the image for each line in the vertical direction. Read sequentially for each pixel toward the right end.

The image cutout unit 100 reads out the pixels of the image data D ₁ read from the memory Y ₁ in this way toward the line direction with respect to the memory T ₁ as shown on the left side of FIG. The data is sequentially written every time (timing WD _{1 in} FIG. 13E). That is, every time one pixel is read from the memory Y ₁ , for example, the image cutout unit 100 writes the read one pixel into the memory T ₁ .

The right side of FIG. 15A shows an image 162 of the image data D ₁ written in the memory T ₁ in this way. The image data D ₁ is written in the memory T ₁ as a size of horizontal 1080 pixels × vertical pixels 1920 (line), and the image 160 at the time of input is rotated 90 ° clockwise so that the horizontal direction and the vertical direction are switched. The image 162 is displayed.

The image clipping unit 100 performs addressing of the clip region that is specified in the image control unit 103 to the memory T _1, reads the image data of the specified region as the cut-out area from the memory T _1. The timing of this reading is delayed by the amount of 2 vertical synchronization signals VD with respect to the timing at which the image data D ₁ is input to the image cutout unit 100, as shown as timing RD ₁ in FIG. become.

As described above, the projector device 1 according to the present embodiment changes the projection angle θ by the projection lens 12 by rotating the drum unit 10 to move the projection position of the projection image, and also changes the image according to the projection angle θ. Specify the read position for data. For example, the image data D ₁ is input to the image cutout unit 100 at the timing of the projection angle θ ₁ . Projection angle theta in the timing for projecting an image of the image data D ₁ actually is, from the projection angle theta _1, it is likely that changes in the incident angle theta ₁ is different from the projection angle theta _3.

Therefore, cut-out area for reading image data D ₁ from the memory T ₁ is expected to change in the projection angle theta, to read out at a range greater than the area of the image data corresponding to an image to be projected.

This will be described more specifically with reference to FIG. The left side of FIG. 15B shows an image of the image 163 based on the image data D ₁ stored in the memory T ₁ . In this image 163, it is assumed that the area actually projected is a projection area 163a, and the other area 163b is a non-projection area. In this case, the image control unit 103 has a maximum projection angle θ by the projection lens 12 in the period of the two vertical synchronization signals VD with respect to the memory T ₁ , at least during the period of the two vertical synchronization signals VD, compared to the image data area corresponding to the image in the projection area 163. A cutout area 170 that is as large as the number of lines corresponding to the change amount when the change is made is designated.

The image clipping unit 100, the image data D ₁ at the timing of the next vertical synchronizing signal VD of the written vertical synchronizing signal VD to the memory T _1, reads the image data from the cutout region 170. Thus, image data to be projected is read from the memory T ₁ at the timing of the projection angle θ ₃ , supplied to the display element 114 via the image processing unit 102 at the subsequent stage, and projected from the projection lens 12.

Image data D ₂ is input to the image cutout unit 100 at the timing of the vertical synchronization signal VD next to the vertical synchronization signal VD to which the image data D ₁ is input. At this timing, the image data D ₁ is written in the memory Y ₁ . Therefore, the image cutout unit 100 writes the image data D ₂ in the memory Y ₂ (timing WD _{2 in} FIG. 13F). At this time, the order of writing the image data D _{2 to} the memory Y ₂ is the same as the order of writing the image data D _{1 to} the memory Y ₁ , and the image is also the same (see FIG. 14B). .

That is, the image clipping unit 100, the image data D _2, as the starting pixel readout in the lower left corner of the pixel of the image, across lines sequentially in the vertical direction read-out to the top of the pixels of the image for each pixel, then the vertical Each pixel is read out in the vertical direction with the pixel on the right of the pixel at the readout start position as the readout start pixel (timing RD _{2 in} FIG. 13F). This operation is repeated until the readout of the pixel at the upper right corner of the image is completed. The image cutout unit 100 sequentially writes the pixels of the image data D ₂ read out from the memory Y ₂ in this way into the memory T ₂ for each pixel in the line direction (timing shown in FIG. 13G). WD ₂ ) (see the left side of FIG. 15A).

The image clipping unit 100 performs addressing of the clip region that is specified in the image control unit 103 to the memory T _2, the image data of the area that is as the cutout region, at the timing RD ₂ in FIG. 13 (g) read from the memory T _2. At this time, as described above, the image control unit 103 cuts out an area larger than the area of the image data corresponding to the projected image with respect to the memory T _{2 in consideration} of the change in the projection angle θ. Specify as.

The image clipping unit 100, the image data D ₂ at the timing of the next vertical synchronizing signal VD of the written vertical synchronizing signal VD to the memory T _2, to read the image data from the cutout region 170. Thus, the image data of the clip region 170 in the image data D ₂ input to the image cutout section 100 at the timing of the projection angle theta ₂ is read from the memory T ₂ at the timing of the projection angle theta _4, the following image processing unit The light is supplied to the display element 114 through 102 and projected from the projection lens 12.

Thereafter, in the same manner, the image data D ₃ , D ₄ , D ₅ ,... Are sequentially processed by alternately using the set of memories Y ₁ and T _{1 and} the set of memories Y ₂ and T _2. Go.

As described above, in the present embodiment, the area of the memories Y ₁ and Y ₂ used for writing / reading image data with a size of horizontal 1920 pixels × vertical 1080 pixels (lines) with respect to the memory 101 and horizontal 1080 pixels. × The areas of the memories T ₁ and T ₂ used for writing and reading of image data are provided in the size of the vertical pixel 1920 (line). This is because a dynamic random access memory (DRAM) used for an image memory generally has a slower access speed in the vertical direction than in the horizontal direction. In the case of using another easily accessible memory that can obtain the same access speed in the horizontal direction and the vertical direction, a configuration in which two memories having a capacity corresponding to image data may be used.

Not limited to the above, when the image data input to the image cutout unit 100 has a size of horizontal 1920 pixels × vertical 1080 pixels (lines), as shown in FIG. The data is written into the memory 101Y ₁ (or memory 101Y ₂ ) without switching the horizontal direction and the vertical direction, and the image control unit 103 sets a plurality of lines of image data as shown in FIG. It can also be designated as a cutout area 171. In this case, an image based on the image data read from the cutout area 171 by the image cutout unit 100 is projected from the projection lens 12.

Further, the image control unit 103, the image data written in the memory 101Y _1, as shown in FIG. 16 (c), it is also possible to specify an arbitrary rectangular area 172 as the cutout region. In this case, the image data read out from the memory 101Y ₁ by using the rectangular area 172 as a cut-out area by the image cut-out section 100 is supplied to the image processing section 102. As described above, the image processing unit 102 performs image processing on the supplied image data, and the image data of the clipped area is projected from the projection lens 12. In the case of FIGS. 16B and 16C, the memories Y ₁ and Y ₂ used for writing / reading image data are sequentially switched and used in a size of horizontal 1920 pixels × vertical 1080 pixels (lines).

Further in this case, if the area to cut out image data input to the image cutout unit 100 is set in advance, it is not necessary to write all of the regions of the input image data, for example, in the memory 101Y _1. That is, the image cutout unit 100 stores image data obtained by adding image data including a line corresponding to the projection angle θ delayed by the above-described access control to the image data in the region corresponding to the projected image, for example, a memory to write to Y _1.

The same applies to writing to and reading from the memories T ₁ and T ₂ . That is, when an area for cutting out the image data input to the image cutout unit 100 is set in advance, it is not necessary to write all the areas of the input image data in, for example, the memory T ₁ . That is, as illustrated in FIG. 17A, the image cutout unit 100 adds a line corresponding to the projection angle θ that is delayed by the access control described above to the image data in the region corresponding to the projected image. For example, the image data 173 is written to the memory T ₁ . Similarly, in the case of reading, the image cutout unit 100 reads only the image data 173 written in, for example, the memory T ₁ .

Further, the horizontal direction and the vertical direction of image data having a size of horizontal 1920 pixels × vertical 1080 pixels (lines) input to the image cutout unit 100 are exchanged in the memory T ₁ by the method described with reference to FIG. If the written (see FIG. 17 (c)), the image control unit 103, the memory T _1, as shown in FIG. 17 (d), also specify an arbitrary rectangular area 174 as the cutout region it can. In this case, the image data read out from the memory 101T ₁ by using the rectangular region 174 as a cut-out region by the image cut-out unit 100 is supplied to the image processing unit 102. As described above, the image processing unit 102 performs image processing on the supplied image data, and the image data of the clipped area is projected from the projection lens 12.

<Flow of processing for projecting image data>
Next, the flow of processing when projecting an image based on image data in the projector apparatus 1 will be described using the flowchart of FIG.

In step S100, along with the input of the image data, various setting values relating to the projection of the image based on the image data are input to the projector apparatus 1. For example, the CPU 120 acquires the various set values that have been input. The various setting values acquired here include, for example, a value indicating whether or not to rotate the image based on the image data, that is, whether or not the horizontal direction and the vertical direction of the image are switched, the image enlargement ratio, and the projection Including the offset angle θ _ofst . Various setting values may be input to the projector apparatus 1 as data in accordance with the input of image data to the projector apparatus 1 or may be input by operating the operation unit 14.

  In the next step S100, image data for one frame is input to the projector apparatus 1, and the input image data is acquired by the image cutout unit 100. The acquired image data is written into the memory 101.

In the next step S102, the image control unit 103 acquires the offset angle θ _ofst . In the next step S103, the image control unit 103 acquires the cutout size, that is, the size of the cutout area in the input image data. The image processing unit 103 may acquire the size of the cutout area from the setting value acquired in step S <b> 100 or according to an operation on the operation unit 14. In the next step S <b> 104, the image control unit 103 acquires the angle of view α of the projection lens 12. The image control unit 103 acquires the angle of view α of the projection lens 12 from, for example, the angle of view control unit 104. Further, in the next step S <b> 105, the image control unit 103 acquires the projection angle θ of the projection lens 12 from, for example, the rotation control unit 104.

In the next step S106, the image control unit 103 performs the above-described expression (3) based on the offset angle θ _ofst acquired in steps S102 to S105, the size of the cutout region, the angle of view α, and the projection angle θ. ) To (8) are used to obtain a cutout region for the input image data. The image control unit 103 instructs the image cutout unit 100 to read out image data from the obtained cutout region. The image cutout unit 100 reads image data in the cutout region from the image data stored in the memory 101 in accordance with an instruction from the image control unit 103. The image clipping unit 100 supplies the image data of the clipping region read from the memory 101 to the image processing unit 102.

  In step S107, the image processing unit 102 performs size conversion processing on the image data supplied from the image cutout unit 100, for example, according to the above-described formulas (1) and (2). The image data subjected to the size conversion process by the image processing unit 102 is supplied to the display element 114. The display element 114 modulates the light from the light source 111 according to the image data and emits it. The emitted light is projected from the projection lens 12.

  In the next step S108, the CPU 120 determines whether or not there is an input of image data of the next frame of the image data input in step S101 described above. If it is determined that there is an input of image data of the next frame, the CPU 120 returns the process to step S101, and performs the processes of steps S101 to S107 described above on the image data of the next frame. . That is, the processing in steps S101 to S107 is repeated for each frame of image data, for example, according to the vertical synchronization signal VD of the image data. Therefore, the projector device 1 can follow each process for each frame with respect to the change in the projection angle θ.

  On the other hand, if it is determined in step S108 that the image data of the next frame is not input, the CPU 120 stops the image projection operation in the projector device 1. For example, the CPU 120 controls to turn off the light source 111 and issues a command to the rotation mechanism unit 105 to return the posture of the drum unit 10 to the initial posture. Then, after the posture of the drum unit 10 returns to the initial posture, the CPU 120 stops the fan that cools the light source 111 and the like.

  As described above, according to the projector device 1, it is possible to perform image projection that allows the user to easily grasp the position of the projected subject image in the image related to the input image data while maintaining the resolution of the image data. it can.

  In the above-described embodiment, the drum unit 10 included in the projector device 1 is rotated only in the vertical direction with respect to the base 20, and the projection direction of the projection lens 12 is changed only in the vertical direction. However, this rotation or change is not limited to the vertical direction. For example, the present invention can be applied to a projection apparatus having a configuration capable of panning and tilting and capable of changing the projection direction of the projection unit in a horizontal or vertical direction, and the effects thereof can be obtained.

1 Projector device 1
DESCRIPTION OF SYMBOLS 10 Drum part 12 Projection lens 14 Operation part 20 Base 30 Drum 32 Drive part 35, 42a, 42b, 43 Gear 40 Motor 41 Warm gear 50a, 50b Photo reflector 51a, 51b Photo interrupter 100 Image clipping part 101 Memory 102 Image processing part 103 Image control unit 104 Rotation control unit 105 Rotation mechanism unit 106 Angle of view control unit 110 Optical engine unit 114 Display element 120 CPU
140 Image data

Claims (3)

A projection unit that converts image data into light and projects the light at a variable angle of view;
A projection direction changing unit that changes the projection direction of the projection unit from the first projection direction to the second projection direction; and
A projection angle deriving unit for deriving a projection angle between the first projection direction and the projection direction changed by the projection direction changing unit;
A storage unit for storing input image data input;
An image of the input image data stored in the storage unit, when said projection portion is projected over the second projection direction from the first projection direction, said input stored before term memory unit The projection unit extracts cut-out image data obtained by cutting out a partial area of an image of image data based on at least the angle of view and the number of pixels per unit angle corresponding to the variable amount of the angle of view and the projection angle. A projection apparatus comprising: an image cutout unit that generates the image data to be projected. When the distance from the projection unit to the projection surface increases as the projection direction changes from the first projection direction to the second projection direction, the projection angle is set for each pixel of the cut-out image data. The projection apparatus according to claim 1, further comprising an image processing unit that performs a reduction process based on the image processing unit. As the projection direction changes from the first projection direction to the second projection direction, when the distance from the projection unit to the projection surface is reduced, the projection angle is set to the projection angle for each pixel of the cut-out image data. The projection apparatus according to claim 1, further comprising an image processing unit that performs an enlargement process based thereon.

Images