Geometric Correction Adjustment for Projection Apparatus
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Solution Overview
Problem
Current projection systems face difficulties in easily performing geometric correction adjustments, requiring complex operations and multiple steps to align the projection region with the projection target without distortion.
Innovation Solution
A digital light processing (DLP) projector with a micromirror display device and a geometric correction adjustment method that allows users to easily adjust the projection region by shifting vertices of the effective element region along the sides of the micromirror element, using a cross-key operation to align the projection region with the projection target, thereby simplifying the geometric correction process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional geometric correction adjustment methods are used, then projection region alignment can be achieved, but the adjustment process becomes complex and difficult to operate
Solution Approach 1:
The patent uses a camera to capture an image of the projection target, creating a visual copy of the target surface. This captured image is then displayed on a display device, allowing users to see the projection region overlay and make adjustments based on visual feedback rather than complex calculations or multiple physical alignments.
Solution Approach 2:
The system provides real-time visual feedback by displaying the captured projection target image alongside the projection region boundaries. Users can observe how adjustments affect the alignment immediately on the display device, enabling intuitive geometric correction without requiring understanding of complex transformation parameters.
2Manufacturing precision
If multiple adjustment steps are used to align projection region, then accurate geometric correction can be achieved, but adjustment time increases
Solution Approach 1:
The system performs preliminary capture of the projection target image and preliminary calculation of the projection region boundaries before the user makes adjustments. By pre-processing the target image and determining the initial projection region overlay, the system eliminates the need for multiple iterative adjustment steps, allowing users to make direct corrections based on the pre-calculated overlay display.
Solution Approach 2:
By creating a visual copy of the projection target and overlaying it with the projection region boundaries on the display device, the system provides a complete adjustment reference in a single view. This eliminates the need for multiple physical adjustment steps and repeated measurements, achieving accurate alignment in one adjustment phase.
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 straightforward and efficient geometric correction, allowing users to project images without distortion by directly matching the projection region with the projection target through intuitive vertex adjustments, reducing the complexity of the adjustment process.
Implementation Method 1
a digital light processing (DLP) projector with a micromirror display device
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A projection apparatus (1) includes a projection optical system (20, 16), an output display element (15), an operation unit (28) acquiring an adjustment instruction, a geometric correction adjustment unit (13a), and a geometric correction unit (13b). The output display element (15) having an element region (62) including pixels that modulate projection light by a quadrangular effective element region (64) in the element region (62). The geometric correction adjustment unit (13a) transforms the effective element region (64) to shift a vertex (641, 642, 643, 644) of the effective element region (64) along a side (646, 647, 648, 649), according to the adjustment instruction. The geometric correction unit (13b) performs an operation of projecting an input image on the effective element region (64).