JP5256864B2 - projector - Google Patents

Description

  The present invention relates to a projector.

A projector that prevents a private image from being projected is known (see, for example, Patent Document 1). In this projector, an image for presentation and a private image are judged based on the brightness and contrast of the image, and in the case of a private image, the image is converted into black and white and displayed as a thumbnail, and is projected only when selected after that. Processing is performed.
JP 2006-3395 A

  However, in this projector, even a private image is projected on the screen by a black and white thumbnail display, so that the private image may be recognized by an audience watching the screen. Further, when a private image is accidentally projected, the image projected on the screen cannot be made unrecognizable.

  It is an object of the present invention to provide a projector that prevents an audience from recognizing images that are not intended to be shown to the audience.

In the projector according to the aspect of the invention, the projection unit that projects the first image, the detection unit that detects at least a part of the movement of the device itself, and the detection unit detects repetitive motion, and the amplitude of the repetitive motion is a predetermined value. An image processing unit that changes the first image projected by the projection unit to a second image different from the first image so that the first image projected by the projection unit cannot be recognized .

  According to the projector of the present invention, an image that is not intended to be shown to the audience can be prevented from being recognized by the audience.

  A projector according to a first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an external appearance of a projector according to the first embodiment. The projector 2 is a handy-type projector that can be held in the hand and project an image. The power switch 4 that turns the power on and off on the front of the projector 2 and the image that is not intended to be seen are not recognized by the audience. A mode selection button 6 for selecting an image concealment mode for performing image processing, a playback button 8 for projecting an image, and a stop button 10 for stopping projection of an image are provided. An image is projected on the side of the projector 2. A projection window 12 is provided.

  FIG. 2 is a block diagram showing a system configuration of the projector according to the first embodiment. The projector 2 includes a CPU 14. The CPU 14 includes a power switch 4, a mode selection button 6, a playback button 8, a stop button 10, an operation unit 16 that includes a projection optical system that projects an image, and a movement of the projector 2. A detection unit 20 including an angular velocity sensor to detect, an image processing unit 22 that changes or corrects an image to be projected, and a projection image storage unit 24 that stores image data of an image to be projected are connected.

  Here, the projection unit 18 includes a power supply control unit 28 that turns on and off the LED 26 that is a light source, an LCOS (reflection liquid crystal element) 30 that displays an image to be projected, and a display control unit 32 that performs display control of the LCOS 30. ing.

  Next, processing of the projector 2 will be described with reference to the flowchart shown in FIG. When the power switch 4 is operated and the projector 2 is turned on, it is determined whether or not the image concealment mode is selected by operating the mode selection button 6 (step S1). When the image concealment mode is not selected, the image is projected without performing the image concealment process. When the image concealment mode is selected, when the playback button 8 is pressed, the image read from the projection image storage unit 24 is displayed on the LCOS 30 of the projection unit 18 and the image is projected by the projection unit 18 (step S2). . Here, when the detection unit 20 detects the movement of the projector 2 (step S3), it is determined whether the detected movement is a repetitive movement or a movement in one direction (step S4). If it is determined that the movement is in one direction, it is determined that the projection position of the image is changed, and the projection of the image by the projection unit 18 is continued without changing or correcting the image (step S7). ). On the other hand, if it is determined that the motion is repetitive motion, it is determined whether the amplitude of the repetitive motion is greater than or equal to a predetermined threshold value (step S5). Here, as the predetermined threshold value of the amplitude of the repetitive motion, a length 2/3 to 1 times the length of the projected image in the vertical or horizontal direction on the screen is used. If it is equal to or less than the threshold value, it is determined that the movement is a repetitive movement due to camera shake, the camera shake correction is performed by the image processing unit 22 (step S8), and the image is projected by the projection unit 18 (step S7). On the other hand, if it is equal to or greater than the threshold value, the image concealing process for changing the image to an unrecognizable state is performed by the image processing unit 22 (step S6), and the projection unit 18 projects the image (step S7).

  Here, FIG. 4 is a diagram illustrating an example of an image stored in the projection image storage unit 24. The projected image storage unit 24 stores still images 42, 44, and 46. The image 44 is an image that the user does not intend to show to the audience. In the projector 2, the image 42, the image 44, and the image 46 are switched every 10 seconds and projected in order. In this case, as shown in FIG. 5, first, the image 42 is projected, and after the image 42 is projected for 10 seconds, the projected image is switched to the image 44. Here, since the image 44 is an image that is not intended to be shown to the audience, when the user shakes the projector 2, the motion is detected by the detection unit 20 in step S <b> 3, and it is determined that the motion is repetitive in step S <b> 4. In step S5, it is determined that the amplitude of the repetitive motion is greater than or equal to the threshold value, and in step S6, image concealment processing is performed to change the image 44 to an unrecognizable state by the image processing unit 22, and step In S7, an image subjected to image concealment processing is projected as shown in FIG. Then, the image to be projected is switched to the image 46 when 10 seconds have elapsed after the projection of the image 44 is started. When the user stops the operation of shaking the projector 2, an image 46 that is not subjected to image concealment processing is projected as shown in FIG.

  Here, as the predetermined threshold value of the amplitude of the repetitive motion in the present embodiment, a length 2/3 to 1 times the length of the projected image in the vertical direction or the horizontal direction is used. The amplitude threshold is not limited to this.

  According to the present embodiment, it is possible to prevent an audience from recognizing an image that is not intended to be shown to the audience in a handy type projector that can project an image by hand.

  In the present embodiment, the projector 2 may be provided with the display unit 48. In this case, when the detection unit 20 detects the repetitive motion and the image concealment processing is performed when the amplitude of the repetitive motion is equal to or larger than the threshold, the image subjected to the image concealment processing is projected as shown in FIG. The display unit 48 displays an image 44 that is not subjected to image concealment processing.

  In the present embodiment, as the image concealment process, any one of the process of blurring the image, obscuring the image, switching the image, and stopping the projection of the image is performed. Here, when performing the process of blurring the image or obscuring the image, the focus of the projected image is reduced, reducing the resolution of the image, lowering the contrast of the image, eliminating or reducing the color component of the image. Change, fill part of the image, apply mosaic to part of the image, reduce the image, enlarge the image so that only a part of the image can be recognized, the amount of light emitted from the LED 26 Processing such as lowering the luminance is performed by decreasing the value. In addition, when performing a process of switching images, a process of switching to another specified image such as a screen saver or returning to the previous image is performed. Further, when stopping the projection, processing such as stopping the emission of light from the LED 26, stopping the output of the image, and not displaying the image on the LCOS 30 is performed.

  In addition, when the detection unit 20 detects a repetitive movement or movement in one direction that is greater than or equal to the threshold value of the projector 2, the light emitted from the LED 26 is emitted from the LED 26 in order to avoid a risk that the light emitted from the projection window 12 is mistakenly directed to a person. The amount of light emitted may be greatly reduced.

  In the present embodiment, the projection of the still image is described as being switched every 10 seconds. However, the switching time is arbitrary, and switching is performed when the projector 2 is provided with a switching button for switching the image to be projected. You may make it switch the still image projected by operation of a button. Moreover, although the case where the image to project is a still image was demonstrated in this Embodiment as an example, you may project a moving image.

  Moreover, as shown in FIG. 9, you may make it perform the image concealment process of the image projected only in the direction where the projector 2 was shaken.

  Next, a projector according to a second embodiment of the invention will be described with reference to FIGS. The projector according to the first embodiment is a handy type projector 2 capable of projecting an image by hand, and the projector according to the second embodiment is a stationary type provided with a remote controller 52 shown in FIG. Projector 54. Note that the configurations of the remote controller 52 and the projector 54 according to the second embodiment are obtained by dividing the system configuration according to the projector 2 described above. Therefore, a detailed description of the same configuration as the projector 2 described above will be omitted, and only different parts will be described in detail. The same components as those of the projector 2 described above are denoted by the same reference numerals for description.

  As shown in FIG. 10, the projector 54 includes a remote control 52, and a power switch 4, a playback button 8, and a stop button 10 are provided on the front surface of the remote control 52. A transmission unit 56 is provided for transmitting instruction information such as an instruction to perform image processing based on the movement of the remote controller 52 to the projector 54 using infrared light. Further, the projector 54 is provided with a receiving unit 58 that receives the instruction information transmitted from the projection window 12 and the remote controller 52.

  FIG. 11 is a block diagram showing a system configuration of the remote controller 52. The remote controller 52 includes a CPU 58, to which the power switch 4, the play button 8, the operation unit 16 including the stop button 10, the detection unit 20, and the transmission unit 56 are connected.

  FIG. 12 is a block diagram showing a system configuration of the projector 54. The projector 54 includes a CPU 60, and the projection unit 18, the image processing unit 22, the projection image storage unit 24, and the reception unit 58 are connected to the CPU 60.

  Next, processing of the remote controller 52 will be described with reference to the flowchart shown in FIG. When the power switch 4 is operated, power-on instruction information is transmitted to the projector 54, and when the playback button 8 is pressed, instruction information for starting image projection is transmitted to the projector 54 (step S21). The projector 54 reads out an image from the projection image storage unit 24 based on the instruction information received from the remote controller 52 and starts projection. Here, when the detection unit 20 detects the movement of the remote controller 52 during image projection (step S22), it is determined whether the detected movement is a repetitive movement or a movement in one direction (step S23). If it is determined that the movement is repetitive, it is determined whether the amplitude of the repetitive movement is greater than or equal to a predetermined threshold (step S24). If it is equal to or greater than the threshold, instruction information for performing image concealment processing for changing the image to an unrecognizable state by the image processing unit 22 is transmitted to the projector 54 (step S25). The projector 54 performs image concealment processing on the image to be projected based on the instruction information, and the projection unit 18 projects the image. The image concealment process is performed by a method similar to the method used in the first embodiment.

  That is, when the remote controller 52 is shaken when projection of an image that is not intended to be shown to the audience is started, the detection unit 20 determines that the motion is repetitive and the amplitude is determined to be greater than or equal to a predetermined threshold. Then, the remote controller 52 transmits instruction information for image concealment processing to the projector 54. Since the image is changed to an unrecognizable state by the image processing unit 22 on the basis of the instruction information in the projector 54, an unintended image projection can be prevented.

  When the detection unit determines in step S23 that the movement of the remote controller 52 is a movement in one direction, and when it is determined in step S24 that the amplitude of the repetitive motion is equal to or less than a predetermined threshold, the instruction information to the projector 54 Therefore, the projector 54 continues the projection without changing or correcting the image.

  According to the present embodiment, it is possible to prevent an audience from recognizing an image that is not intended to be shown to the audience in a stationary projector equipped with a remote control.

  In the present embodiment, the remote controller 52 does not include the mode selection button 6, but the remote controller 52 may include the mode selection button 6. In this case, the remote controller 52 performs steps S21 to S25 only when the mode selection button 6 is operated and an image concealment mode for performing image concealment processing is selected.

  In each of the above-described embodiments, the repetitive motion of the projector 2 or the remote controller 52 is detected, and the image concealment process is performed when the amplitude of the repetitive motion is equal to or greater than the threshold value. May be used as the threshold value. Further, the larger the amplitude, intensity, number of times, and time values, the larger the blurring amount of the projected image, or the processing of increasing the density of the mosaic, etc. Further, it may be configured to increase the degree that the projected image becomes unrecognizable according to the number of times and the time value. Further, as the amplitude, intensity, number of times, and time values are larger, a region where blurring or mosaic is partially applied to the projected image may be increased.

  In each of the above-described embodiments, when the repetitive motion is detected by the detection unit 20 and the amplitude of the repetitive motion is equal to or greater than the threshold value, image concealment processing is performed while the projector 2 or the remote controller 52 is repetitively moving. However, once the repetitive motion whose amplitude is greater than or equal to the threshold value is detected by the detection unit 20 once, the image concealment processing is started, and the image concealment processing is continued even if the repetitive motion of the projector 2 or the remote controller 52 is not continued. The image concealment process may be continued until the next image is switched.

1 is a diagram showing an appearance of a projector according to a first embodiment of the invention. 1 is a block diagram showing a system configuration of a projector according to a first embodiment of the present invention. It is a flowchart which shows the process of the projector which concerns on the 1st Embodiment of this invention. It is a figure which shows the image memorize | stored in the projection image memory | storage part which concerns on the 1st Embodiment of this invention. It is a figure which shows the image projected from the projector which concerns on the 1st Embodiment of this invention. It is a figure which shows the image projected from the projector which concerns on the 1st Embodiment of this invention. It is a figure which shows the image projected from the projector which concerns on the 1st Embodiment of this invention. It is a figure which shows the image projected from the projector which concerns on the 1st Embodiment of this invention. It is a figure which shows the image projected from the projector which concerns on the 1st Embodiment of this invention. It is a figure which shows the projector and remote control which concern on the 2nd Embodiment of this invention. It is a block diagram which shows the system configuration | structure of the remote control which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the system configuration | structure of the projector which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the process of the remote control which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Projector, 12 ... Projection window, 20 ... Detection part, 22 ... Image processing part, 26 ... LED, 30 ... LCOS, 52 ... Remote control.

Claims (7)

A projection unit for projecting the first image;
A detection unit for detecting movement of at least a part of the device itself;
When the repetitive motion is detected by the detection unit and the amplitude of the repetitive motion is greater than or equal to a predetermined threshold value, a second different from the first image so that the first image projected by the projection unit cannot be recognized. A projector comprising: an image processing unit that changes an image. The projector according to claim 1, wherein
The projector according to claim 1, wherein the image processing unit performs image processing that blurs or obscure the first image and changes the image to the second image. The projector according to claim 2,
The projector according to claim 1, wherein the image processing unit performs image processing to reduce a resolution, a contrast, or a color component of the first image and changes the image to the second image. In the projector according to claim 2 or claim 3,
The projector according to claim 1, wherein the image processing unit performs image processing for painting or mosaicing a part of the first image and changing the image to the second image. In the projector according to any one of claims 1 to 4,
When the repetitive motion is detected by the detection unit and the amplitude of the repetitive motion is equal to or less than a predetermined threshold, the image processing unit corrects the position where the first image is projected to be constant. Projector. The projector according to any one of claims 1 to 5,
The projector according to claim 1, wherein the image processing unit does not correct or change the first image when movement in one direction is detected by the detection unit. The projector according to any one of claims 1 to 6,
A projector comprising: a display unit that displays the first image when the second image is projected by the projection unit.

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