Projector Image Correction Without a Z Filter
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Solution Overview
Problem
Existing projectors require a special optical filter called a Z filter for measuring the Z value, complicating their configuration.
Innovation Solution
A method and apparatus for controlling a projector that identifies the state of the light source, generates correction parameters based on this state, and corrects the projected image using these parameters, without the need for a Z filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a special optical filter called a Z filter is used to measure the Z value, then the measurement capability is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the Z filter from the projector system entirely. Instead of including the special optical filter in the projector, the invention uses the projector's existing imaging section to capture images, and then calculates color information (including Z value equivalents) through image processing and color space conversion algorithms.
Solution Approach 2:
The patent replaces the mechanical/optical measurement system (Z filter) with an electronic/computational system. The imaging section captures RGB images, and through coordinate transformation and color space conversion, the system derives colorimetric information that would traditionally require the Z filter, thereby substituting physical measurement hardware with computational processing.
2Reliability
If light source state variations are not corrected, then the projector configuration remains simple, but the image quality deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the imaging section continuously captures images of the projection output, the control section analyzes these images to detect light source state variations, and then applies correction parameters to compensate for detected changes. This closed-loop system maintains image quality by automatically adapting to light source fluctuations without requiring complex additional hardware.
Solution Approach 2:
The projector uses its own imaging section to monitor and correct its own projection output. The control section performs self-diagnosis of light source state by analyzing images captured from the projection, and automatically generates correction parameters, enabling the system to self-correct without external intervention or additional specialized components.
Data Source
AI summary
A method for controlling a projector including a light source, the method including identifying the state of the light source, generating a correction parameter based on the state of the light source, and correcting an image projected from the projector based on the correction parameter.