Fisheye Image Clipping and Orientation Correction
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Solution Overview
Problem
Fisheye images captured using a fisheye lens suffer from significant distortion, making it difficult for users to visually confirm peripheral details due to the projective method of image capture, which results in a wide viewing angle but distorted edges.
Innovation Solution
An image display device and method that includes a clipping unit to select a target area from the fisheye image, a correcting unit to apply distortion correction using virtual spherical models, and a display control unit to specify and display the corrected image's vertical direction based on orientation information, thereby enhancing visibility of peripheral details.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a fisheye lens is used to capture images with a wide viewing angle, then the viewing angle is improved, but the image distortion increases significantly
Solution Approach 1:
The patent divides the fisheye image into multiple regions (clipping target areas) and processes each region separately. The image is segmented into a first region (center area) and a second region (peripheral area), with different distortion correction methods applied to each, allowing the wide viewing angle benefit to be maintained while correcting distortion in specific areas.
Solution Approach 2:
Different distortion correction methods are applied to different regions of the image. The center region uses one correction method while the peripheral region uses another, allowing each area to be optimized for its specific distortion characteristics while maintaining the overall wide viewing angle capability.
2Manufacturing precision
If distortion correction is applied to the entire fisheye image, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The patent segments the image processing into multiple independent stages: clipping the fisheye image to create a clipping target area, then applying distortion correction only to this clipped region. This segmentation reduces the complexity compared to correcting the entire image while maintaining precision in the area of interest.
Solution Approach 2:
The patent extracts only the necessary portion of the fisheye image (the clipping target area) for distortion correction, rather than processing the entire image. This extraction approach reduces computational complexity while maintaining the quality of the corrected region.
3Ease of operation
If the corrected image is displayed without orientation information, then the ease of operation is improved, but the loss of information increases
Solution Approach 1:
The patent incorporates orientation information from the captured fisheye image into the display process. The specifying unit determines the vertical direction based on the orientation information, and the display control unit rotates the corrected image to match the captured orientation. This feedback mechanism ensures that the displayed image maintains accurate spatial orientation without complicating user operation.
Data Source
AI summary
An image display device including a display unit and a computing device that is operable to function as units including a clipping unit which clips an image of one portion from a fisheye image captured by using a fisheye lens as a clipping target area, a correcting unit which corrects distortion of the image clipped by the clipping unit, a specifying unit which specifies a vertical direction of a corrected image acquired by the correcting unit, based on orientation information when the fisheye image is captured, and a display control unit which controls the corrected image to be displayed on the display unit based on the vertical direction specified by the specifying unit.