DLP projection system and implementation method

Abstract

The invention provides a DLP projection system and an implementation method. The DLP projection system comprises an optical imaging module, an image processing module and a projection angle adjusting module, the optical imaging module is used for converting a binary bitmap corresponding to the DMD chip based on image signal conversion into a dynamic image; the image processing module is used for carrying out image processing on the formed dynamic image, so that the processed dynamic image meets a preset requirement; and the projection angle adjusting module is used for adjusting the projection direction so as to realize projection of different scenes.

Description

Technical Field

[0001] The present invention relates to the field of vehicle-mounted projection technology, in particular, to a DLP projection system and an implementation method thereof, and more particularly, to a vehicle-mounted aircraft DLP projection system and an implementation method thereof. Background Art

[0002] The existing color DLP projection system is only used in cars, and the application scenarios are very limited. The DLP of the present invention is mounted on a drone, and then the entire drone is placed on the car, and with the adjustment device, it can meet the application of more projection scenarios.

[0003] Patent document CN112305841A (application number: 201910708013.7) discloses a DLP projection system and a vehicle, wherein the DLP projection system includes: a light source; an optical component module, the optical component module is used to process the light emitted by the light source to obtain an incident light beam; a binary diffraction device, the binary diffraction device is perpendicular to the incident light beam, and the binary diffraction device is used to shape and homogenize the incident light beam; a DMD chip, the surface of the DMD chip is parallel to the binary diffraction device, and the DMD chip is used to modulate the shaped and homogenized light to project a pattern. Summary of the invention

[0004] In view of the defects in the prior art, an object of the present invention is to provide a DLP projection system and an implementation method.

[0005] A DLP projection system provided according to the present invention includes: an optical imaging module, an image processing module, and a projection angle adjustment module;

[0006] The optical imaging module is used to convert the binary bitmap corresponding to the DMD chip based on the image signal conversion into a dynamic image;

[0007] The image processing module is used to perform image processing on the formed dynamic image, so that the processed dynamic image meets the preset requirements;

[0008] The projection angle adjustment module is used to adjust the projection direction, thereby realizing the projection of different scenes.

[0009] Preferably, the DLP projection system further comprises: a vehicle-mounted aircraft; and the vehicle-mounted aircraft is used to carry the DLP projection system to realize projection of any application scenario.

[0010] Preferably, the optical imaging module includes a DMD chip; the DMD chip includes n tiltable reflectors that meet preset requirements; when light is incident on the DMD chip, each reflector is tilted to different degrees according to different input electrical signals, thereby reflecting the light in different directions.

[0011] Preferably, the optical imaging module comprises:

[0012] The signal processing submodule is used to convert the image signal into a binary bitmap corresponding to the DMD chip; and decompose the binary bitmap into multiple single digital image frames according to the time sequence;

[0013] The optical imaging submodule is used to transmit the light source separated by the color separation wheel to the DMD chip in a time-sharing manner. The reflector on the DMD chip reflects the light that meets the preset conditions according to the signal of each pixel in the bitmap, and lights up the projected image; the reflected light is focused again by the optical lens to form an enlarged image, which is projected onto the screen or wall; and a continuous dynamic image is formed by continuously refreshing the bitmap.

[0014] Preferably, the image processing module comprises: when a trapezoidal image appears on the projection screen, performing trapezoidal correction on the current image through the image processing module;

[0015] The method of performing trapezoidal correction on the current image screen by using the image processing module includes: identifying the horizontal angle offset of the DLP projection system or the offset of the projection surface by using the TOF sensor, and performing automatic trapezoidal correction by using a low-latency trapezoidal correction algorithm.

[0016] Preferably, the image processing module includes: automatically adjusting the projection area based on the angle between the projection light and the road surface.

[0017] Preferably, the image processing module comprises: when multiple DLP projection systems are used simultaneously and edges of multiple projection images may have up-down or left-right deviations, edge fusion is achieved using an image fusion method in the image processing module.

[0018] Preferably, the projection angle adjustment module comprises: automatically controlling the DLP projection system by means of an adjustment device so that the movement of the aircraft is compensated and blurring of the projected image is minimized;

[0019] The automatic control of the DLP projection system by the adjustment device comprises:

[0020] The adjusting device includes three axes, namely, X, Y and Z directions, each axis has a micro-brush motor to control the rotation of the axis, and the adjusting device includes an inertial measurement unit, in which an acceleration sensor and a gyroscope sensor are integrated; when the vehicle-mounted aircraft DLP projection system encounters a gust of wind, the gyroscope sensor will detect the angle between the vehicle-mounted aircraft DLP projection system and the direction of gravity, and then feed the angle back to the micro-control unit in the adjusting device, and the micro-control unit will adjust the micro-brush motor of the corresponding axis in real time to compensate for the blur of the projected image.

[0021] A DLP projection system implementation method provided by the present invention includes:

[0022] The optical imaging module is used to convert the binary bitmap corresponding to the DMD chip based on the image signal conversion into a dynamic image;

[0023] Performing image processing on the formed dynamic image by using an image processing module, so that the processed dynamic image meets the preset requirements;

[0024] The projection angle adjustment module is used to adjust the projection direction to achieve projection of different scenes.

[0025] Preferably, the DLP projection system further comprises: a vehicle-mounted aircraft; and the vehicle-mounted aircraft is used to carry the DLP projection system to realize projection of any application scenario.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. The present invention solves the problems of trapezoidal projection screen, deformation of projection graphics, and non-fusion of edges of multi-module projection screens by adopting an image processing module, so that the projection screen is always rectangular, the projection area is always equal, and the multi-module projection screen is perfectly fused;

[0028] 2. The present invention solves the problem of anti-shake of the projection image by adopting a projection angle adjustment module, so that when the aircraft is flying or encountering a gust of wind, the projection module can be automatically controlled by the adjustment device, thereby minimizing the blur of the projection image.

[0029] 3. The present invention adopts a structure in which the projection module is mounted on a vehicle-mounted aircraft, thereby solving the problem that when an accident occurs during an outdoor self-driving tour, a video for asking for help can be recorded through the projection module, and then the vehicle-mounted aircraft carries the projection module to find the nearest rescue point to project the help information, so as to achieve rapid and accurate rescue, thereby achieving the effect of using the projection module for emergency help in emergencies. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0031] Figure 1 Schematic diagram of the vehicle-mounted aircraft DLP projection system.

[0032] Figure 2 The figure is a flow chart of the vehicle-mounted aircraft DLP projection method. DETAILED DESCRIPTION

[0033] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0034] Example 1

[0035] According to the present invention, a vehicle-mounted aircraft DLP projection system and implementation method are provided, such as Figures 1 to 2 As shown, it can be installed on a vehicle to meet the projection needs of different scenes.

[0036] The DLP projection system of the vehicle-mounted aircraft includes: an optical imaging module, a graphics processing module, and a projection angle adjustment module; the optical imaging module is used to convert the binary bitmap corresponding to the DMD chip based on the image signal conversion into a dynamic image; the image processing module is used to perform image processing on the formed dynamic image so that the processed dynamic image meets the preset requirements; the projection angle adjustment module is used to adjust the projection direction to achieve projection of different scenes. The present invention can be applied to scenes such as welcoming interaction, outdoor viewing, and emergency rescue through the cooperation of the above modules.

[0037] The main core component of the optical imaging module is the DMD chip, which has tens of thousands of tiny tiltable mirrors. When light is incident on the DMD chip, each tiny mirror can be tilted to different degrees according to the different input electrical signals, thereby reflecting the light in different directions. In this embodiment, the electrical signal is a binary bitmap recognizable by the DMD chip, and the mirror on the micromirror chip can reflect or not reflect according to the binary bitmap of input 0 or 1. When a given mirror is controlled to reflect, the corresponding pixel will light up; when the mirror is not reflective, the corresponding pixel will be dark. By controlling the reflection of each mirror on the micromirror chip, a complete image can be formed.

[0038] Specifically, during the working process, the DLP projection module first converts the input image signal into a binary bitmap corresponding to the DMD chip through the digital signal. Then the bitmap is decomposed into many single digital image frames in time series. Next, the light from the light source is separated by the color separation wheel and reaches the DMD chip in time. According to the signal of each pixel in the bitmap, the tiny mirrors on the DMD chip will reflect the light that meets the conditions and light up the projected image. Finally, the reflected light is focused again through the optical lens to form an enlarged image and projected onto the screen or wall. By constantly refreshing the bitmap, the DLP projection module can quickly display continuous image frames, thereby presenting continuous dynamic images. The image quality of DLP mainly depends on the number of tiny mirrors of the DMD chip, and the number of DMD pixels can be selected as needed.

[0039] The graphics processing module includes: when the projection module is not placed correctly or the projection screen is tilted, a trapezoidal image appears on the projection screen instead of a square projection screen. At this time, the trapezoidal correction function of the projection module can be used to compensate for this defect. The trapezoidal correction can be manual correction or automatic correction. The automatic correction method is to use the TOF sensor to identify the horizontal angle offset of the module itself or the offset of the projection surface, so as to perform automatic trapezoidal correction through a low-latency trapezoidal correction algorithm;

[0040] The graphics processing module also includes: when the projection module is installed on the outside of the vehicle together with the vehicle-mounted aircraft, the projection module can project information such as lane lines and vehicle speed onto the road surface. However, when the road surface is undulating, the original projection area cannot reach the expected projection area due to the undulation of the road surface. At this time, the graphics processing unit of the projection module can dynamically adjust the projection area after receiving the relevant data and geographic information data of the vehicle body end to ensure that the final projection area remains unchanged. In this embodiment, the relevant data and geographic information data of the vehicle body end refer to the angle between the projection light captured by the sensor and the road surface. If the road surface is flat, the angle is fixed. If the road surface is undulating, there is a difference between the captured angle and the internally calibrated angle. The dynamic adjustment is to compensate for the angle difference according to the algorithm.

[0041] The graphics processing module also includes: when the number of projection modules is greater than 2, when the projection modules are used at the same time, the edges of multiple projection images will have up and down or left and right deviations. At this time, the edge fusion operation can be achieved through the image fusion algorithm in the graphics processing unit. There are two ways to implement the graphics edge fusion algorithm. One is that the whole vehicle uses a camera to shoot the projection images of the left and right modules, and the fusion algorithm is used to analyze the image status, so as to perform edge fusion operations. The second is to use a specific edge fusion chip, and the left and right images are simultaneously input into the edge fusion chip, and the graphics fusion algorithm and HDR2 algorithm are applied to perform edge fusion and then integrated for projection.

[0042] The projection angle adjustment module includes: adjusting the projection direction of the projection module. After the aircraft is launched, the projection module realizes the projection of different scenes by adjusting the projection angle, so that the projection direction of the projection module is not affected by the flight attitude of the aircraft;

[0043] The projection angle adjustment module also includes: projection image anti-shake, which means that when the aircraft is flying or encounters a gust of wind, the projection module can be automatically controlled by the adjustment device to compensate for the movement of the aircraft and minimize the blur of the projected image.

[0044] The adjustment device has three axes of X / Y / Z, and each axis has a micro-brush motor to control the rotation of the axis. At the same time, the adjustment device has an inertial measurement unit, which integrates an acceleration sensor and a gyroscope sensor. When the projection module encounters a gust of wind, the gyroscope sensor will detect the angle between the projection module and the direction of gravity, and then feed the angle back to the micro-control unit in the adjustment device. The micro-control unit will adjust the brushless motor of the corresponding axis in real time to compensate for the blur of the projected image, thereby achieving an anti-shake effect.

[0045] The present invention also provides a vehicle-mounted aircraft DLP projection system, which can be implemented by executing the process steps of the vehicle-mounted aircraft DLP projection system implementation method, that is, those skilled in the art can understand the vehicle-mounted aircraft DLP projection system implementation method as a preferred implementation mode of the vehicle-mounted aircraft DLP projection system.

[0046] When the projection module is installed outside the vehicle with the vehicle-mounted aircraft, the vehicle-mounted aircraft carrying the projection module can be installed as a whole at any position of the vehicle, such as at the front grille. A fully transparent aircraft cabin can be designed at the front grille. The aircraft and the projection module are placed in the transparent cabin, and the projection angle of the projection module can still be adjusted through the terminal device or the adjustment switch set inside the vehicle. When the projection module is installed outside the vehicle, the projection area is larger. When the vehicle is stationary, the projection module adjusts the projection module to the wall through the projection angle adjustment device. Through the cooperation of the projection module and the sound module inside the vehicle, the user can interact with the mobile phone multimedia while sitting in the car, such as watching movies and large-screen display of the game interface, and can also realize video projection and play plan discussion outdoors through an external speaker; when the vehicle is driving, the projection module can also project the vehicle speed, traffic signs, and driving status through the projection angle adjustment device to realize human-vehicle interaction, vehicle-vehicle interaction, and vehicle-environment interaction, thereby transmitting effective driving intention transmission information to pedestrians and vehicle drivers outside the vehicle, and at the same time, the projection content can also be customized to realize the vehicle welcoming and farewell functions. In addition, the present invention can also solve the problem of recording a distress video through the projection module when an accident occurs during an outdoor self-driving tour by adopting a structure in which the projection module is mounted on a vehicle-mounted aircraft. Then the vehicle-mounted aircraft is equipped with a projection module to find the nearest rescue point to project the distress information, thereby achieving rapid and accurate rescue, thereby achieving the effect of using the projection module to call for emergency help in emergencies.

[0047] Those skilled in the art know that, in addition to realizing the system and its various devices, modules, and units provided by the present invention in a purely computer-readable program code, it is entirely possible to realize the same functions in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system and its various devices, modules, and units provided by the present invention can be considered as a hardware component, and the devices, modules, and units included therein for realizing various functions can also be regarded as structures within the hardware component; the devices, modules, and units for realizing various functions can also be regarded as both software modules for realizing the method and structures within the hardware component.

[0048] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily.

Claims

1. A DLP projection system, characterized in that: include: Optical imaging module, image processing module, projection angle adjustment module; The optical imaging module is used to convert the binary bitmap corresponding to the DMD chip based on the image signal conversion into a dynamic image; The image processing module is used to perform image processing on the formed dynamic image, so that the processed dynamic image meets the preset requirements; The projection angle adjustment module is used to adjust the projection direction, thereby realizing the projection of different scenes.

2. The DLP projection system according to claim 1, characterized in that: The DLP projection system also includes: a vehicle-mounted aircraft; and the vehicle-mounted aircraft is used to carry the DLP projection system to realize projection of any application scene.

3. The DLP projection system according to claim 1 or 2, characterized in that: The optical imaging module includes a DMD chip; the DMD chip includes n tiltable reflectors that meet preset requirements; when light is incident on the DMD chip, each reflector is tilted to different degrees according to different input electrical signals, thereby reflecting the light in different directions.

4. The DLP projection system according to claim 3, characterized in that: The optical imaging module comprises: The signal processing submodule is used to convert the image signal into a binary bitmap corresponding to the DMD chip; and decompose the binary bitmap into multiple single digital image frames according to the time sequence; The optical imaging submodule is used to transmit the light source separated by the color separation wheel to the DMD chip in a time-sharing manner. The reflector on the DMD chip reflects the light that meets the preset conditions according to the signal of each pixel in the bitmap, and lights up the projected image; the reflected light is focused again by the optical lens to form an enlarged image, which is projected onto the screen or wall; and a continuous dynamic image is formed by continuously refreshing the bitmap.

5. The DLP projection system according to claim 1 or 2, characterized in that: The image processing module includes: when a trapezoidal image appears on the projection screen, the image processing module performs trapezoidal correction on the current image; The method of performing trapezoidal correction on the current image screen by using the image processing module includes: identifying the horizontal angle offset of the DLP projection system or the offset of the projection surface by using the TOF sensor, and performing automatic trapezoidal correction by using a low-latency trapezoidal correction algorithm.

6. The DLP projection system according to claim 1 or 2, characterized in that: The image processing module includes: automatically adjusting the projection area based on the angle between the projection light and the road surface.

7. The DLP projection system according to claim 1 or 2, characterized in that: The image processing module includes: when multiple DLP projection systems are used simultaneously and the edges of multiple projection images have up-down or left-right deviations, edge fusion is achieved by using an image fusion method in the image processing module.

8. The DLP projection system according to claim 2, characterized in that: The projection angle adjustment module includes: automatically controlling the DLP projection system through an adjustment device so that the movement of the aircraft is compensated and the blur of the projected image is minimized; The automatic control of the DLP projection system by the adjustment device comprises: The adjusting device includes three axes, namely, X, Y and Z directions, each axis has a micro-brush motor to control the rotation of the axis, and the adjusting device includes an inertial measurement unit, in which an acceleration sensor and a gyroscope sensor are integrated; when the vehicle-mounted aircraft DLP projection system encounters a gust of wind, the gyroscope sensor will detect the angle between the vehicle-mounted aircraft DLP projection system and the direction of gravity, and then feed the angle back to the micro-control unit in the adjusting device, and the micro-control unit will adjust the micro-brush motor of the corresponding axis in real time to compensate for the blur of the projected image.

9. A method for implementing a DLP projection system, characterized in that: include: The optical imaging module is used to convert the binary bitmap corresponding to the DMD chip based on the image signal conversion into a dynamic image; Performing image processing on the formed dynamic image by using an image processing module, so that the processed dynamic image meets the preset requirements; The projection angle adjustment module is used to adjust the projection direction to achieve projection of different scenes.

10. The DLP projection system implementation method according to claim 9, characterized in that: The DLP projection system also includes: a vehicle-mounted aircraft; and the vehicle-mounted aircraft is used to carry the DLP projection system to realize projection of any application scene.

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