Image Generation Device Rotation Angle Control for Wide-Angle Clip Stability
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Solution Overview
Problem
Wide-angle images captured with lenses like fisheye lenses result in rapid orientation changes of targets when clipped and displayed, making the image difficult to view, especially when the camera is installed vertically or the target is near the camera.
Innovation Solution
An image generation device with a reference angle determination unit, rotation angle storage unit, and rotation angle calculation unit that calculates and controls the rotation angle of the clip image to prevent excessive orientation changes, using a predetermined threshold angle and distance calculations to stabilize the target's orientation in the display image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If rotation processing is executed to correct target inclination in clipped images, then the target orientation accuracy is improved, but the display image becomes difficult to see due to rapid and large orientation changes
Solution Approach 1:
The patent applies dynamics by making the rotation angle adaptive rather than fixed. The rotation angle calculation unit dynamically adjusts the rotation angle based on the relationship between the clip area center position and the image center position. When the clip area is near the image center, a smaller rotation angle is applied; when farther away, a larger rotation angle is applied. This dynamic adjustment resolves the contradiction by allowing orientation correction while preventing excessive rotation that would make the display image difficult to see.
Solution Approach 2:
The patent changes the parameter of rotation angle from a fixed value to a variable that depends on the clip area position. By calculating the rotation angle based on the distance between the clip area center and image center, the system optimizes the rotation amount for each specific case, thereby maintaining target orientation accuracy while avoiding overly large rotations that would harm display visibility.
2Ease of manufacture
If a fixed rotation angle is applied to all clip areas, then the processing simplicity is improved, but the target orientation changes rapidly and largely affecting display quality
Solution Approach 1:
The system transitions from a static fixed rotation angle to a dynamic position-dependent rotation angle. The rotation angle calculation unit computes different rotation angles based on the clip area's position in the wide-angle image, creating a dynamic adaptation that maintains both processing efficiency and orientation stability.
Solution Approach 2:
The patent applies local quality by making the rotation angle specific to each clip area's location. Instead of using a uniform rotation angle for all clips, the system calculates locally optimized rotation angles based on each clip's distance from the image center, thereby improving target orientation stability without significantly complicating the overall processing.
3Area of stationary object
If the camera is installed vertically on the ceiling or when the target is near the camera, then the coverage area is improved, but the orientation inversion and rapid changes become more remarkable
Solution Approach 1:
The patent changes the rotation angle parameter dynamically based on the clip area position, which is particularly effective for vertically mounted cameras or close-range targets. By calculating rotation angles relative to the image center and adjusting them according to the clip's position, the system compensates for the orientation inversion and rapid changes that occur in these specific installation scenarios.
Solution Approach 2:
The system applies preliminary anti-action by pre-calculating and applying compensatory rotation angles before display. Based on the known relationship between clip position and required rotation, the system proactively adjusts the orientation to counteract the expected rapid changes and inversion effects, thereby maintaining stable and viewable target orientation in challenging installation configurations.
Data Source
AI summary
A camera device is provided with: an imaging unit for generating an area image obtained by shooting an area from above; and a display image generation unit for generating a display image of a target moving in the area using a clip image which is clipped from the area image. In this case, a rotation angle of a current frame is calculated on the basis of the rotation angle of the previous frame and a reference angle of the current frame. As a result, a rapid change in an orientation of the target displayed in the display image can be suppressed.