Fisheye Projection Correction Through Pixel Reference Mapping
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Solution Overview
Problem
Conventional image projector systems using ultra-wide angle lenses, such as fisheye lenses, suffer from significant image distortion when projecting images onto screens, necessitating effective distortion correction methods.
Innovation Solution
A projection device equipped with a fisheye lens and a processor that generates a correction image by calculating reference locations based on pixel coordinates, adjusting pixel values, and projecting the corrected image to counteract distortion, utilizing low-frequency filters and distance parameters to maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an ultra-wide angle lens (fisheye lens) is used to project images onto a screen, then the projection can cover a wider area and enable 360° projection, but the projected image becomes greatly distorted
Solution Approach 1:
The patent applies preliminary action by pre-calculating and generating a correction image that compensates for the distortion caused by the fisheye lens before projection. The processor calculates reference locations and generates correction values in advance, so that when the image is projected through the ultra-wide angle lens, the pre-applied correction counteracts the lens-induced distortion, resulting in an undistorted final image on the screen
Solution Approach 2:
The patent employs parameter changes by modifying pixel coordinates and applying correction values based on calculated reference locations. The processor transforms the original image parameters (pixel positions, coordinates) into corrected parameters that, when projected through the fisheye lens, produce the desired undistorted shape on the screen while maintaining the wide projection area
2Shape
If distortion correction is applied by calculating reference locations and adjusting pixel values, then image distortion is corrected, but the processing complexity increases
Solution Approach 1:
The patent replaces complex mechanical or optical correction systems with a computational approach. Instead of using additional optical elements or mechanical adjustments to correct distortion, the system uses digital image processing - calculating reference locations, generating correction values, and adjusting pixel values through software algorithms, thereby reducing mechanical complexity while achieving effective distortion correction
Solution Approach 2:
The patent creates a corrected copy of the original image through digital processing. The processor generates a correction image based on the original image data, applying transformation and correction algorithms to produce a new image version that compensates for distortion. This digital copying and transformation approach is simpler than physical correction mechanisms
Data Source
AI summary
A projection device for projecting an image, the projection device including a projector; a fisheye lens; memory; and at least one processor configured to generate a correction image that corrects distortion of an input image projected onto a screen through the fisheye lens, wherein the correction image is generated by calculating a plurality of reference locations, each calculated reference location of the plurality of calculated reference locations being based respectively on pixel coordinates of a pixel of a plurality of pixels of the generated correction image, and setting a pixel value of each pixel of the plurality of pixels of the generated correction image by referencing a pixel value of the input image corresponding to each respective calculated reference location of the plurality of calculated reference locations, and control the projector to project the generated correction image onto the screen through the fisheye lens.