Projection Image Color Correction Using External Adjustment Region Markers
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Solution Overview
Problem
Existing image processing methods for projection surfaces degrade image quality due to the superimposition of markers used for correction, as they are displayed within the projection image area.
Innovation Solution
An image processing method that acquires a captured image containing a projection image and feature points outside the display region, allowing for color or luminance correction without overlapping markers, using a processing apparatus that includes a camera and optical apparatus to project and adjust images based on calibration data and conversion matrices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If markers are superimposed on the projection image for correction, then color or luminance correction can be performed, but the quality of the projection image deteriorates during the period for which markers are displayed
Solution Approach 1:
The patent divides the projection surface into two distinct regions: a display region for showing the projection image and an adjustment region for displaying markers. This spatial segmentation allows markers to be displayed separately from the projection image, enabling color correction without degrading the quality of the projection image in the display region.
Solution Approach 2:
The patent utilizes the spatial dimension by extending the correction process to a separate region (adjustment region) outside the display region. By placing markers in this additional spatial dimension (the adjustment region), the system maintains the ability to perform color correction while keeping the display region free of markers.
2Measurement precision
If markers are displayed within the projection image area for correction, then color or luminance correction can be performed, but the image quality is lowered during marker display
Solution Approach 1:
The patent segments the projection surface into a display region and an adjustment region. Markers are displayed in the adjustment region for color measurement and correction, while the display region maintains high image quality without marker interference. This segmentation allows simultaneous achievement of measurement precision and image quality.
Solution Approach 2:
The adjustment region acts as an intermediary space that facilitates color measurement and correction without directly interfering with the display region. Markers displayed in this intermediary region enable color calibration while the projection image in the display region remains unaffected.
3Reliability
If the positional relationship between projector and projection surface changes, then re-calibration is needed, but this increases processing time and complexity
Solution Approach 1:
The patent performs color correction based on captured images of the adjustment region containing markers. By using pre-positioned markers in the adjustment region and capturing their positions, the system can determine correction data without requiring full re-calibration when positional changes occur, reducing re-calibration time while maintaining accuracy.
Solution Approach 2:
The system captures images of the adjustment region with markers, detects marker positions, and uses this feedback information to determine appropriate color correction data. This feedback mechanism allows the system to adapt to positional changes efficiently without complete re-calibration, maintaining reliability while minimizing time loss.
Data Source
AI summary
An image processing method according to an aspect of the present disclosure includes acquiring a captured image containing a projection image projected onto a projection surface from an optical apparatus based on an image signal and a plurality of feature points located in a region outside a region where the projection image is displayed on the projection surface by capturing an image of the projection surface, and correcting color or luminance of the projection image based on the captured image.