Projector Distance Sensor Movement Detection
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Solution Overview
Problem
Existing projector apparatuses face challenges in detecting the movement of a body to be projected without increasing the size or complexity, which can lead to inaccuracies in projection mapping when the body is moving.
Innovation Solution
A projector apparatus with a distance image acquisition device that includes a projector unit and a distance image sensor, which generates distance images to detect the shape of the body and determines whether it is stationary by calculating difference values between distance information at different times, allowing for accurate projection mapping without increasing the apparatus's size or complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate detection device is added to detect the movement of the body to be projected, then the movement detection accuracy is improved, but the device complexity and size increase
Solution Approach 1:
The distance image acquisition device originally designed for acquiring distance information for projection mapping is made to serve a dual function: it continues to generate distance images for projection mapping while simultaneously detecting movement of the body by comparing distance images taken at different times. This eliminates the need for a separate detection device.
Solution Approach 2:
The movement detection function is merged with the existing distance image acquisition system. The same distance image sensor, measurement light source, and processing units are used for both projection mapping and movement detection, combining multiple functions into a single integrated system.
2Measurement precision
If a separate detection device is added to detect the movement of the body to be projected, then the movement detection accuracy is improved, but the apparatus size increases
Solution Approach 1:
The distance image acquisition device is designed to perform multiple functions: generating distance images for projection mapping and detecting body movement by temporal comparison. This multi-functionality eliminates the need for additional detection hardware, keeping the apparatus size compact.
Solution Approach 2:
The movement detection capability is integrated into the existing distance image acquisition system, merging what would traditionally be separate functions into a single compact unit. The same hardware components serve both projection mapping and movement detection purposes.
3Adaptability or versatility
If the body to be projected is moving, then the projection mapping can cover more areas, but the deviation between the body and projection image increases
Solution Approach 1:
The system continuously monitors the position of the body by comparing distance images taken at different times. When movement is detected, the system provides feedback to adjust the projection image accordingly, ensuring that the projection remains accurately aligned with the moving body throughout the projection process.
Solution Approach 2:
The projection system is designed to dynamically adapt to the movement of the body. By detecting movement in real-time and adjusting the projection image based on the detected movement, the system maintains accurate alignment even when the body is in motion, transforming from a static to a dynamic projection system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-accuracy projection mapping by detecting the movement of the body to be projected, preventing deviations between the body and the projection image, and controlling the projection operation based on the determination of the body's movement, thus ensuring precise image projection.
Implementation Method 1
a distance image generation unit that acquires, from the distance image sensor, distance information corresponding to a time of flight of measurement light which is emitted from the measurement light source, is reflected from the body to be projected, and is incident on the distance image sensor
Implementation Method 2
a focus lens that focuses measurement light which is emitted from the measurement light source and is reflected from the body to be projected on the distance image sensor
Data Source
AI summary
In an aspect of the invention, a projector apparatus (20) with a distance image acquisition device includes a projection image generation unit (28), a difference value acquisition unit (101) that acquires a difference value between distance information of a first distance image acquired at a first timing and distance information of a second distance image acquired at a second timing, a determination unit (103) that determines whether the body to be projected is at a standstill on the basis of the difference value acquired by the difference value acquisition unit (101), a projection instruction unit (105) that outputs a command to project an image generated by the projection image generation unit (28) to the body to be projected, and a projection control unit (107) that controls a projection operation of the projector apparatus (20) on the basis of the projection command output from the projection instruction unit (105).