WO2017065553A1 - Image projection apparatus, projection method thereof, and non-temporary computer-readable recording medium - Google Patents

Abstract

Provided are an image projection apparatus, a projection method thereof, and a non-temporary computer-readable recording medium. An image projection apparatus according to one embodiment of the present invention may comprise: an optical module for projecting an image in a surface direction extending from a placement surface on which the image projection apparatus is placed; a driving module capable of moving the optical module; a sensor module for sensing at least one from among the size and shape of the image on the projection surface on which the image is projected; and a processor for compensating the image by controlling the driving module so that same moves the optical module on the basis of the sensing results of the sensor module.

Description

Image projection apparatus, its image projection method and non-transitory computer readable recording medium

The present invention relates to an image projection apparatus, an image projection method thereof, and a non-transitory computer readable recording medium. More specifically, the position of an optical module is analyzed so that distortion does not occur in an image by analyzing an angle and a distance from a projection target surface. And a non-transitory computer readable recording medium.

A projector is a type of display device that displays an image by projecting an input image signal onto a screen using light emitted from a light source. Such projectors are used for various purposes in conference rooms, theaters, home theaters, and the like.

However, the existing projectors were inconvenient in that they were installed in a large, heavy, fixed location. Accordingly, although a pico projector that emphasizes portability has been developed, a cumbersome process of installing and focusing on a tripod is required to view a desired image. In addition, there is a problem that if a person or an object exists between the projector surface and the project, shadows are generated, which interferes with viewing content.

Accordingly, a portable projector using ultra short focus optical system has been proposed as an alternative. In the case of a projector using an ultra-short focus optical system, the projection distance is fixed, and there is a problem that the image is blurred when the projection optical system and the projection surface are not horizontal or the image is blurred when the projection distance is far.

The present invention is to solve the above problems, an object of the present invention is to analyze the angle and distance from the projection surface to automatically adjust the position of the optical module or to provide a guide message so that distortion does not occur in the image An image projection apparatus, an image projection method thereof, and a non-transitory computer readable recording medium are provided.

An image projection apparatus according to an embodiment of the present invention for achieving the above object is, an optical module for projecting an image in a surface direction extending from the placement surface on which the image projection apparatus is disposed, movable to move the optical module A module, a sensor module for sensing at least one of the size and shape of the image on the projection surface on which the image is projected, and the movable module to control the movable module to move the optical module based on a sensing result of the sensor module. It may include a processor for correcting the image.

The sensor module detects the size of the projected image, and the processor analyzes the distance between the image projector and the projection surface by comparing the detected projected image size with the size of a reference image. The size of the reference image may be determined according to a predetermined distance between the lens and the mirror included in the optical module.

The movable module may also include a translation module for translating the optical module, and the processor may control the translation module to translate the optical module based on the analyzed distance.

The sensor module may detect the shape of the projected image, and the processor may analyze the projection direction of the optical module and the angle formed by the projection surface based on the detected shape of the projected image.

The movable module also includes a rotary motion module for rotating the optical module, and the processor may control the rotary motion module to rotate the optical module based on the analyzed angle.

The sensor module detects a position of a recognition mark for recognizing an edge portion of an image, and the processor controls the optical module to output the recognition mark together with the image, and the recognition mark detected by the sensor module. At least one of the size and shape of the image may be determined by determining a location of the image.

In addition, the processor compares the projected image with the reference image and, if at least one of the size and shape of the projected image is different from the reference image, provides a guide message indicating that the position adjustment of the image projection apparatus is necessary. Can provide.

The processor may be configured to project the image when one surface of the image projection apparatus is disposed close to the placement surface, and stop the projection of the image when one surface of the image projection apparatus is spaced apart from the placement surface. You can control the module.

On the other hand, the image projection method of the image projection apparatus according to an embodiment of the present invention for achieving the above object, the step of projecting an image in a surface direction extending from the placement surface on which the image projection apparatus is disposed through an optical module, And detecting at least one of the size and shape of the image on the projection surface on which the image is projected, and correcting the image by moving the optical module based on the detection result.

The detecting may include detecting the size of the projected image and comparing the detected size of the projected image with a size of a reference image to analyze a distance between the image projecting device and the projection surface. The size of the reference image may be determined according to a predetermined distance between the lens and the mirror included in the optical module.

The correcting of the image by moving the optical module may correct the image by translating the optical module based on the analyzed distance.

The detecting may include detecting a shape of the projected image and analyzing a projection direction of the optical module and an angle formed by the projection surface based on the detected shape of the projected image. can do.

In the correcting of the image by moving the optical module, the image may be corrected by rotating the optical module based on the analyzed angle.

And outputting a recognition mark capable of recognizing an edge portion of the image together with the image, detecting a position of the recognition mark, and at least one of a size and a shape of the image based on the detected position of the recognition mark. The method may further include determining one.

In addition, comparing the projected image and the reference image, if at least one of the size and shape of the projected image is different from the reference image, providing a guide message indicating that the position adjustment of the image projection apparatus is necessary; It may further include.

The projecting of the image may include projecting an image when one surface of the image projection apparatus is disposed close to the layout surface, and stopping projecting the image when one surface of the image projection apparatus is spaced apart from the layout surface. can do.

Meanwhile, a non-transitory computer readable recording medium including a program for executing an image projection method of an image projection apparatus according to an embodiment of the present invention for achieving the above object is arranged by the image projection apparatus through an optical module. Projecting an image in a surface direction extending from the arranged placement surface, detecting at least one of the size and shape of the image on the projection surface onto which the image is projected, and moving the optical module based on the detection result And an image projection method of the image projection apparatus including correcting the image.

According to various embodiments of the present disclosure as described above, the user may know where to move the image projection apparatus through the guide message to eliminate distortion of the projection image, and the image may be projected without the image projection apparatus itself moving. Can be corrected automatically.

1A and 1B are views for explaining a concept of an image projection apparatus according to an embodiment of the present invention;

2 is a schematic block diagram illustrating a configuration of an image projection apparatus according to an embodiment of the present invention;

3A is a block diagram for explaining in detail the configuration of an image projection apparatus according to an embodiment of the present invention;

3B illustrates an example of a module stored in a memory of an image projection apparatus according to an embodiment of the present invention;

3C is a diagram illustrating examples of an external device capable of receiving data by an image projection device according to an embodiment of the present invention;

4 is a view showing an optical module and a movable module of an image projection apparatus according to an embodiment of the present invention;

5 is a diagram illustrating a case where image projection of the image projection apparatus according to an embodiment of the present invention is normally performed;

6a to 6c are views showing an example in the case where it is necessary to adjust the angle with the projection surface,

7A and 7B illustrate an example in which it is necessary to adjust a distance from a projection surface;

8A and 8B illustrate an example of providing a guide message for adjusting an angle and a distance from a projection surface;

9A to 9C are views illustrating an example of adjusting a distance or angle to a projection surface by automatically moving an optical module of an image projection apparatus according to an embodiment of the present invention;

10 is a flowchart illustrating an image projection method of an image projection apparatus according to an exemplary embodiment.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the present invention will be described in detail. In describing the present invention, when it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the present invention, and may vary according to a user, an operator, or a custom. Therefore, the definition should be made based on the contents throughout the specification.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by the terms. The terms are only used to distinguish one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component. The term and / or includes any one of a plurality of related items or a combination of a plurality of related items.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting and / or limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, the term including or having is intended to indicate that there is a feature, number, operation, operation, component, part, or a combination thereof described in the specification, one or more other features or numbers, operation It is to be understood that the present invention does not exclude in advance the possibility of the presence or the addition of an operation, a component, a part, or a combination thereof.

1A and 1B are diagrams for describing a concept of an image projection apparatus 100 according to an exemplary embodiment. For example, the image projection apparatus 100 may be implemented as a projector using a single focus optical system. In addition, the image projection apparatus 100 may be a projector using a projection lens mirror system.

 As shown in FIG. 1A, the image projection apparatus 100 according to an exemplary embodiment may project an image when the image projection apparatus 100 is located close to a horizontal surface (bottom surface) such as a table. In addition, as illustrated in FIG. 1B, the image projection apparatus 100 may project an image when positioned close to a vertical surface such as a wall surface. Image projection apparatus 100 according to an embodiment of the present invention is different from the general projector in that it projects an image on the installation surface. In addition, the image projection apparatus 100 according to an embodiment of the present invention has a difference from a general projector in that it is portable.

As such, the image projection apparatus 100 may project an image when the image is close to the target surface (projection surface) to be projected, so that the user may use the image projection function with a simple operation of laying down the image projection apparatus 100. And efficient power management is also possible. That is, the image projection apparatus 100 projects an image when one surface of the image projection apparatus 100 is disposed close to the layout surface, and stops projecting the image when one surface of the image projection apparatus 100 is spaced apart from the layout surface. can do.

2 is a block diagram schematically illustrating a configuration of an image projection apparatus 100 according to an exemplary embodiment. Referring to FIG. 2, the image projector 100 may include an optical module 160, an movable module 150, a sensor module 140, and a processor 110.

The optical module 160 may perform a function of projecting an image. For example, the optical module 160 may include a lens and a mirror. The size of the image projected by the optical module 160 may be determined by the distance between the lens and the mirror. In addition, the projection distance may be fixed according to the specification of the optical module 160 due to the characteristics of the ultra short focus optical system. The configuration of the optical module 160 will be described in detail with reference to FIG. 4 below.

The optical module 160 may project a recognition mark that can recognize an edge portion of the image together with the image. For example, the optical module 160 may output infrared rays to four vertex portions of the rectangular image. By using the sensor module 140, the processor 110 may recognize four dots displayed in the infrared, and based on this, the processor 110 may determine the size and shape of the image.

The movable module 150 may move the optical module 160 under the control of the processor 110. For example, the movable module 150 may rotate or translate the optical module 160. The movable module 150 may include a rotational motion module 151 for performing a rotational motion and a translational motion module 153 for performing a translational motion.

The sensor module 140 may detect an arrangement angle and a distance between the image projector 100 and the projection surface. In addition, the sensor module 140 may detect the size or shape of the projected image by using various types of sensors.

The processor 110 controls the overall configuration of the image projection apparatus 100. By using an angle or a distance between the image projection apparatus 100 and the projection surface sensed by the sensor module 140, the processor 110 may allow the projection image to be clearly displayed. To this end, the processor 110 may control the movable module 150 to change the position of the optical module 150. Due to the characteristics of the ultra-short focus optical system, the image may be distorted if the optical module 150 is not perpendicular to the projection surface. In other words, it is required that the placement surface on which the image projection apparatus 100 is disposed and the projection surface be parallel to each other. In addition, when the distance between the optical module 150 and the projection surface increases, the image may be blurred.

The processor 110 may analyze the distance between the image projection apparatus 100 and the projection surface by comparing the size of the projected image with the size of the reference image. The reference image herein refers to an image projection area determined by the configuration of the optical module 150. That is, when the image projection apparatus 100 is placed on a flat arrangement surface (when the arrangement surface and the projection surface are the same plane extension), the size of the projected image may be the size of the reference image. For example, the size of the reference image may be determined according to the distance between the lens and the mirror included in the optical module 150.

The processor 110 may analyze an angle between the image projection device 100 and the projection surface based on the shape of the projected image. When the reference image is projected in a rectangular shape, the projected image may be in a rhombus shape if the angle between the image projector 100 and the projection projection surface is not vertical.

The processor 110 may compare the projected image with the reference image, and provide a guide message indicating that the position adjustment of the image projection apparatus 100 is necessary when at least one of the size and shape of the projected image is different from the reference image. have.

Through the image projection apparatus 100 as described above, the user can easily know whether the projected image is distorted and the position of the image projection apparatus 100 needs to be adjusted through the guide message. The effect of correcting the projected image can be obtained without shifting the position.

3A is a block diagram illustrating in detail the configuration of the image projection apparatus 100 according to an exemplary embodiment. Referring to FIG. 3A, the image projection apparatus 100 may include one or more processors 110, a communication module 120, a memory 130, a sensor module 140, a movable module 150, an optical module 160, and an interface. An audio module 180, a camera module 191, an indicator 192, an input device 193, a power management module 194, a battery 195, and a wireless charging module 196 may be included. .

The processor 110 may control a plurality of hardware or software components connected to the processor 110 by driving an operating system or an application program, and may perform various data processing and operations including multimedia data. For example, the processor 110 may be implemented in the form of a system on chip (SoC). In addition, the processor 110 may further include a graphic processing unit (GPU).

The communication module 120 is configured as a wireless communication module to perform a wireless communication function with the outside. The communication module 120 may include various modules such as a WiFi module 121, a Bluetooth module 122, and a radio frequency (RF) module 123. In the case of using the WiFi module 121 or the BT module 122, various connection information such as SSID and session key may be transmitted and received first, and then various data may be transmitted and received using the communication connection.

In FIG. 3A, the WiFi module 121 and the BT module 122 are illustrated as separate blocks, but may be implemented in the form of an integrated chip (IC) or an IC package including several types of wireless communication modules.

The RF module 123 may transmit and receive data through the transmission and reception of RF signals. The RF module 123 may include a transceiver, a power amp module (PAM), a frequency filter, a low noise amplifier (LNA), or the like. In FIG. 3A, although the WiFi module 121 and the BT module 122 share one RF module 123 with each other, RF signals may be transmitted and received through separate RF modules 123, respectively.

The communication module 120 may perform communication according to various communication standards such as IEEE, Zigbee, 3rd Generation (3G), 3rd Generation Partnership Project (3GPP), Long Term Evolution (LTE), and the like.

The memory 130 may store various data, programs, or applications for driving and controlling the image projection apparatus 100. For example, the memory 130 may store information about the size and shape of the reference image. The memory 130 may include an internal memory 131. For example, the internal memory 131 may be volatile memory such as dynamic RAM (DRAM), static RAM (SRAM), synchronous dynamic RAM (SDRAM), or one time programmable ROM (OTPROM), programmable ROM (PROM), or erasable EPROM. and non-volatile memory such as programmable ROM (EPROM), electrically erasable and programmable ROM (EEPROM), mask ROM, flash ROM, NAND flash memory, and NOR flash memory.

The sensor module 140 may detect a state of the image projector 100 and convert the detected information into an electrical signal. The sensor module 140 may include a gesture sensor 141, a gyro sensor 142, an acceleration sensor 143, an ultrasonic sensor 144, an infrared sensor 145, a hall sensor 146, a proximity sensor 147, and an illuminance sensor. 148 may be included. In addition, the sensor module 140 may include an olfactory sensor (E-nose sensor, not shown), an EMG sensor (electromyography sensor, not shown), an EEG sensor (electroencephalogram sensor, not shown), an ECG sensor (electrocardiogram sensor, not shown), It may include an iris sensor (not shown) or a fingerprint sensor (not shown), a pressure sensor (not shown).

The sensor module 140 may detect whether the image projection apparatus 100 is close to the placement surface. For example, the sensor module 140 may determine whether the sensor module 140 is close to the placement surface by using the illumination sensor 148 attached to one surface of the image projection apparatus 100. In addition, the sensor module 140 may detect a recognition mark marked with infrared rays using the infrared sensor 145. Through this, the sensor module 140 may detect the size and shape of the projected image.

In addition, the sensor module 140 may determine whether the image projection apparatus 100 is inclined horizontally or vertically by determining the inclination degree of the image projection apparatus 100. The sensor module 140 may detect whether another image projection apparatus 100 ′ is adjacent to each other or a distance from the other image projection apparatus 100 ′.

The movable module 150 can move the optical module 160. The movable module 150 may include a rotary motion module 151 and a translational motion module 153. For example, the movable module 150 may be connected to one side of the optical module 160 and the inner wall of the image projector 100 to rotate or translate the optical module 160. The rotary motion module 151 may be implemented in the form of a step motor. The translational motion module 153 may be implemented in the form of a chain, rack and pinion.

The optical module 160 may project an image. The optical module 160 may include an illumination module 161 and a projection module 162. The projection module 162 may display an image by projecting light onto the projection surface. The projection module 162 may project an image in a surface direction extending from the placement surface on which the image projection apparatus 100 is disposed.

The optical module 160 may project an image when the image projector 100 is located on the placement surface or when the image projection device 100 is located within a predetermined distance from the placement surface. For example, when the image projection apparatus 100 is not close to the placement surface, the power management module 194 may block supplying power to the optical module 160 to prevent the optical module 160 from operating. Can be.

As the projection module 162 projects light, various methods such as DLP, LCOS, 3LCD, and laser may be used.

The interface 170 may include a high-definition multimedia interface (HDMI) 171 and a universal serial bus 172 (USB). The interface 170 may transmit and receive data by wired connection with an external device.

The audio module 180 may bidirectionally convert a voice and an electrical signal. The audio module 180 may process voice information input or output through the speaker 181, the microphone 182, or the like.

The camera module 191 may capture still images and videos. The camera module 191 may include an image sensor and the like, and may capture a projection image to analyze a property of the projection image.

The indicator 192 may display a state of the image projection apparatus 100 or some components thereof, for example, a booting state, a message state, or a charging state.

The input device 193 may receive a user input. For example, the input device 193 may include a physical button, an optical key or a keypad.

The power management module 194 manages power of the image projector 100. For example, when one surface of the image projection apparatus 100 is disposed to be close to the placement surface on which the image is to be projected, the power management module 194 may apply power to the optical module 160.

The battery 195 may store or generate electricity, and supply power to the image projector 100 by using the stored or generated electricity. For example, the battery 195 may include a rechargeable battery or a solar battery.

The wireless charging module 196 may include a circuit capable of wireless charging, for example, a circuit such as a coil loop, a resonant circuit or a rectifier. The wireless charging module 169 may use a magnetic resonance method, a magnetic induction method, or an electromagnetic wave method as a wireless charging method.

Each of the above-described components of the image projection apparatus 100 according to various embodiments of the present disclosure may be configured with one or more components, and the name of the corresponding component may vary according to the type of device. . The image projection apparatus 100 according to various embodiments of the present disclosure may be configured to include at least one of the above components, and some components may be omitted or further include other components. In addition, some of the components of the image projection apparatus 100 according to various embodiments of the present disclosure are combined to form an entity, and thus may perform the same functions of the corresponding components before being combined. have.

3B is an example of a module stored in the memory 130 of the image projection apparatus 100 according to an embodiment of the present invention. Referring to FIG. 3B, the memory 130 includes an operating system 132, a signal processing module 133, a device position determination module 134, a projection surface analysis module 135, a projection image expandability determination module 136, and a user. It may include an input processing module 137.

The operating system 132 controls the overall operation of the image projection apparatus 100.

The signal processing module 133 may perform buffering or signal decoding so that the content received through the communication module 120 may be projected through the optical module 160. The signal processing module 133 may process the image data received by the image projection apparatus 100. The signal processing module 133 may perform various image processing such as decoding, scaling, noise filtering, frame rate conversion, resolution conversion, etc. on the video data.

The device position determination module 134 may determine whether the image projection apparatus 100 is located on the placement surface. For example, the device position determination module 134 may determine whether the image projection apparatus 100 is located on the placement surface or approached within a predetermined distance.

As another example, the device position determination module 134 may determine whether the surface on which the image projection apparatus 100 is located is perpendicular to or horizontal to the gravity direction (eg, perpendicular to the ground surface or horizontal).

The projection surface analysis module 135 may correct the image by analyzing the projector projection surface. For example, the projection surface analysis module 135 may correct geometric information color information of the projection image.

The projection image expandability determination module 136 may determine whether there is at least one other image projection apparatus in the vicinity of the image projection apparatus 100, and determine the expansion possibility of the projection image.

The user input processing module 137 senses a user input in the output projection image and processes data in response thereto.

3C is a diagram illustrating an example of external devices capable of receiving data by the image projection apparatus 100. According to an embodiment of the present disclosure, the image projection apparatus 100 may receive content to be projected from the external device 400 through the communication module 120 or the interface 170.

Examples of the external device 400 include a flexible device 400-1, a watch-type device 400-2, a tablet PC 400-3, a mobile device 400-4, a display device 400-5, a notebook computer. Computer 400-6, desktop computer 400-7, wearable device 400-8 such as smart glasses, and the like. The external device 400 is not limited thereto, and any external device 400 may be any device capable of transmitting content to the image projector 100 by wire or wirelessly. The image projector 100 may store the content received from the external device 400 in the memory 130.

4 is a diagram illustrating an example of an optical module 160 according to an exemplary embodiment. Referring to FIG. 4, the illumination optical system 11 and the projection lens unit 13 may be disposed in the housing 16. The light projected by the illumination optical system 11 may change the direction of light vertically through the prism 12. The projection lens unit 13 is composed of a combination of lenses 14, and the combination of lenses 14 serves to prevent an image from being distorted even at a small projection distance. In addition, the projection lens unit 13 may include a mirror 15, and may reflect light to the side through the mirror 15. The projection lens unit 13 enables the projection to the side projection surface even at a short projection distance by using the ultra short focus lens in combination of the lenses. In another example, the optical module 160 may be configured by horizontally positioning the illumination optical system 11 and the projection lens unit 13 except for the prism 12.

As shown in FIG. 4, the movable module 150 is connected to one side of the optical module 160 to rotate or translate the optical module 160 under the control of the processor 110.

5 is a diagram illustrating a case where the image projection of the image projection apparatus 100 is normally performed according to an embodiment of the present invention.

As shown in FIG. 5, the image projection apparatus 100 and the projection surface are disposed vertically so that the projected image does not cause distortion. In addition, when the lower end of the image projection apparatus 100 is located at the same height as the projection surface, the problem that the projected image is blurred does not occur. In other words, when the placement surface on which the image projection apparatus 100 is disposed and the projection surface are parallel to each other, distortion of the projected image does not occur.

The processor 110 may analyze the distance and angle with respect to the projection surface by using at least one of the sensor module 140 and the camera module 191. For example, a magnetic sensor, an proximity sensor, an infrared sensor, a depth camera, an ultra wide band radar, or the like may be used as the distance measurement.

In addition to the method of directly measuring the distance from the projection surface, the processor 110 may determine a relative difference between the appropriate distance by comparing the size of the reference image and the projected image. For example, if the size of the projected image is larger than the reference image, the processor 110 may determine that the image projection apparatus 100 is disposed farther than the proper distance.

6A to 6C illustrate a case in which it is necessary to adjust an arrangement angle between the image projector 100 and the projection surface.

Referring to FIG. 6A, it can be seen that the projection surface is inclined at a predetermined angle with the placement surface on which the image projection apparatus 100 is disposed. The processor 110 may analyze the arrangement angle between the image projection apparatus 100 and the projection surface by comparing the shape of the projected image with the reference image.

For example, the projected image and the reference image may be displayed on the projection surface as shown in FIG. 6B. The dotted line indicates the reference image, and the solid line corresponds to the projection image. The processor 110 may detect that the shape of the projected image is different from that of the reference image, and determine that the angle adjustment is necessary based on this.

In addition, when the shape of the projected image is different from the reference image, the processor 110 may provide a guide message such as 'adjust the angle with the projection surface of the device'. In FIG. 6A, the guide message is provided from the external device 400 paired with the image projection apparatus 100, but the guide message may be provided from the image projection apparatus 100 or may be provided to the image projection apparatus 100. It may be provided by the included indicator 192, or may be provided by a screen projected by the image projection apparatus 100.

In addition, as shown in FIG. 6C, the processor 110 may control the optical module 160 to stop projecting the image while providing the guide message. As such, when the image is distorted, the processor 110 may stop the projection of the image to reduce power consumption.

7A and 7B illustrate an example in which it is necessary to adjust the distance between the image projection apparatus 100 and the projection surface.

Referring to FIG. 7A, it can be seen that the image projection apparatus 100 is placed on an object, so that the distance from the projection surface is farther away. In this case, as shown in Fig. 7B, the projected image (solid line) will be displayed larger than the reference image (dashed line). That is, the projected image in the case of FIG. 7A is displayed in a blur as compared to the case of projecting at an appropriate distance.

The processor 110 may analyze the distance between the image projection apparatus and the surface on which the image is projected by comparing the size of the projected image with the size of the reference image. For example, if the size of the projection image is larger than the reference image, the processor 110 may determine that the projection distance is farther than the normal distance.

As another example, using a sensor that can directly measure the distance, the processor 110 may know the distance between the image projection apparatus 100 and the projection surface without comparing the size of the reference image. The processor 110 may determine whether it is necessary to move the image projection apparatus 100 by comparing the measured distance with the stored proper distance.

As in the case of the angle, the processor 110 may provide a guide message, such as 'Please adjust the distance to the projection surface of the device,' if the size of the projected image and the size of the reference image are different. In FIG. 7A, the guide message is provided from the external device 400 paired with the image projection apparatus 100, but the guide message may be provided from the image projection apparatus 100 or may be provided to the image projection apparatus 100. It may be provided by the included indicator 192, or may be provided by a screen projected by the image projection apparatus 100.

8A and 8B illustrate an example of providing a guide message when the user moves the image projection apparatus 100 to a position having an appropriate projection angle and an appropriate projection distance.

FIG. 8A corresponds to a case where a user adjusts a case in which the angle between the projection surface and the image projection apparatus 100 of FIG. 6A is not a proper angle. The processor 110 may provide a guide message indicating that the angle should be adjusted as shown in FIG. 6A. The processor 110 may provide a signal indicating that a proper angle is being found in response to the movement of the image projector 110. For example, as the position shifts from the position of the image projection apparatus 100 of FIG. 6A to the position of the image projection apparatus 100 of FIG. 8A, the processor 110 may control the audio module 180 to generate an audio signal smaller and smaller. Can be. If it is determined that the image projection apparatus 110 is located at a position corresponding to an appropriate angle, the processor 110 may provide a guide message such as 'the appropriate projection angle.'

FIG. 8B corresponds to a case where the user adjusts a case in which the distance between the projection surface and the image projection apparatus 100 of FIG. 7A is not a proper distance. The processor 110 may provide a guide message indicating that the distance should be adjusted as shown in FIG. 7A. In addition, the processor 110 may provide a signal indicating that a proper distance is being found in response to the movement of the image projection apparatus 110. For example, as the position shifts from the position of the image projection apparatus 100 of FIG. 7A to the position of the image projection apparatus 100 of FIG. 8B, the processor 110 may control the audio module 180 to generate a smaller voice signal. Can be. In addition, when it is determined that the image projection apparatus 110 is positioned at the same height as the projection surface corresponding to the proper distance, the processor 110 may provide a guide message such as 'the appropriate projection distance.'

The processor 110 may automatically adjust the position of the optical module 160 based on the angle with the projection surface and the projection distance. For example, as shown in FIG. 9A, when it is necessary to adjust the projection distance, the processor 110 may provide a guide message automatically starting to adjust the distance.

In addition, the processor 110 may control the translational motion module 153 to move the optical module 160 downward, as shown in FIG. 9B.

The processor 110 may control the rotational motion module 151 to rotate the optical module 160, as shown in FIG. 9C. By rotating the optical module 160, the processor 110 can adjust the angle with the projection surface.

As shown in FIGS. 9A to 9C, the processor 110 may control the movable module 150 to move the optical module 160 inside the image projection apparatus 100. In this case, since it is not necessary to move the image projection apparatus 100 itself, the user has an effect of viewing a clear projection image more conveniently.

According to various embodiments as described above, the user can prevent the distortion of the projection image when using the ultra short throw projector.

10 is a flowchart illustrating an image projection method of the image projection apparatus 100 according to an exemplary embodiment.

Referring to FIG. 10, the image projection apparatus 100 according to an exemplary embodiment may project an image in a surface direction extending from an arrangement surface on which the image projection apparatus 100 is disposed through an optical module (S1010). ). The direction in which the image projecting device 100 projects an image is different from a general projector in that the direction in which the image is projected is arranged.

The image projection apparatus 100 may detect at least one of the size and shape of the image on the projection surface on which the image is projected (S1020). In this way, the image projection apparatus 100 may analyze an arrangement angle and a distance between the image projection apparatus 100 and the projection surface. For example, the image projector 100 may compare the projected image with the reference image to determine whether the image projector 100 is located at an appropriate angle and distance. The image projection apparatus 100 may determine the size and shape of the projected image by outputting a recognition mark capable of recognizing an edge portion of the image together with the image. The size and shape of the reference image is determined according to a predetermined distance between the lens and the mirror included in the optical module. The image projection apparatus 100 compares the information on the stored reference image with the information on the determined projection image. It may be determined whether the image projection apparatus 100 is located at an angle or a distance.

When the size of the projected image is different from the size of the reference image, the image projection apparatus 100 may determine that it is necessary to adjust the distance to the projection surface. In addition, when the shape of the projected image is different from that of the reference image, the image projection apparatus 100 may determine that it is necessary to adjust the angle with the projection surface.

In this case, the image projection apparatus 100 may provide a guide message to the user to induce the image projection apparatus 100 to move.

The image projection apparatus 100 may correct the image by moving the optical module based on the detection result (S1030).

Various other embodiments of the image projection method of the image projection apparatus 100 overlap with the description of the embodiment of the image projection apparatus 100 and will be omitted.

The methods described above may be embodied in the form of program instructions that may be executed by various computer means and may be recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. Program instructions recorded on the media may be those specially designed and constructed for the purposes of the present invention, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, although the present invention has been described with reference to the limited embodiments and the drawings, the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the claims below but also by the equivalents of the claims.

Claims (15)

1. In the image projection apparatus,

   An optical module for projecting an image in a surface direction extending from an arrangement surface on which the image projector is disposed;

   A movable module capable of moving the optical module;

   A sensor module for detecting at least one of a size and a shape of the image on a projection surface on which the image is projected; And

   And a processor configured to correct the image by controlling the movable module to move the optical module based on a sensing result of the sensor module.
2. The method of claim 1,

   The sensor module,

   Detect the size of the projected image,

   The processor,

   Analyzing the distance between the image projection device and the projection surface by comparing the detected projected image size with a reference image size,

   The size of the reference video is

   And a predetermined distance between the lens and the mirror included in the optical module.
3. The method of claim 2,

   The movable module,

   A translation module for translating the optical module;

   The processor,

   And control the translational motion module to translate the optical module based on the analyzed distance.
4. The method of claim 1,

   The sensor module,

   Detect the shape of the projected image,

   The processor,

   And analyzing an angle formed between the projection direction of the optical module and the projection surface based on the sensed shape of the projected image.
5. The method of claim 4, wherein

   The movable module,

   Includes; a rotary motion module for rotating the optical module,

   The processor,

   And control the rotational motion module to rotate the optical module based on the analyzed angle.
6. The method of claim 1,

   The sensor module,

   Detect the position of the recognition mark to recognize the edge portion of the image,

   The processor,

   And controlling at least one of the size and shape of the image by controlling the optical module to output the recognition mark together with the image, and determining the position of the recognition mark detected by the sensor module.
7. The method of claim 1,

   The processor,

   Comparing the projected image and the reference image, if at least one of the size and shape of the projected image is different from the reference image, providing a guide message indicating that the position adjustment of the image projection apparatus is necessary Image projection device.
8. The method of claim 1,

   The processor,

   And control the optical module to project the image when one surface of the image projection apparatus is disposed close to the placement surface and to stop the image projection when one surface of the image projection apparatus is spaced apart from the layout surface. Image projection device.
9. In the image projection method of the image projection device,

   Projecting an image through an optical module in a surface direction extending from an arrangement surface on which the image projector is disposed;

   Detecting at least one of a size and a shape of the image on a projection surface on which the image is projected; And

   Correcting the image by moving the optical module based on the detection result.
10. The method of claim 9,

    The detecting step,

    Sensing the size of the projected image; And

    Analyzing the distance between the image projection device and the projection surface by comparing the sensed projected image size with a reference image size;

    The size of the reference video is

    And a predetermined distance between the lens and the mirror included in the optical module.
11. The method of claim 10,

    Correcting the image by moving the optical module,

    And correcting the image by translating the optical module based on the analyzed distance.
12. The method of claim 9,

    The detecting step,

    Detecting a shape of the projected image; And

    And analyzing an angle formed by the projection direction of the optical module and the projection surface based on the sensed shape of the projected image.
13. The method of claim 12,

    Correcting the image by moving the optical module,

    And rotating the optical module based on the analyzed angles to correct the image.
14. The method of claim 9,

    Outputting a recognition mark together with the image to recognize an edge portion of the image;

    Detecting a position of the recognition mark; And

    And determining at least one of a size and a shape of the image based on the detected position of the recognition mark.
15. The method of claim 9,

    Comparing the projected image with the reference image and providing a guide message informing that the position adjustment of the image projection apparatus is necessary when at least one of the size and shape of the projected image is different from the reference image; Image projection method comprising the.

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