Vehicle Wide-Angle Display Correction for Accurate Object Alignment
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Solution Overview
Problem
Existing video display devices for vehicles, such as those described in Japanese Patent Application Publication No. 2010-003014, can cause notable objects to appear distorted due to the correction method used, which stretches the image area around a predetermined position to make it horizontal.
Innovation Solution
A video display device equipped with a camera having a wide-angle lens, a distance sensor to measure real-space object distances, and a controller that calculates the object's position in the wide-angle video based on sensor data and corrects the video distortion to ensure the object's position appears horizontal on the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the image area around a predetermined position is stretched to correct distortion, then the predetermined position becomes horizontal, but notable objects at other positions appear distorted
Solution Approach 1:
The patent applies different correction strategies to different regions of the image. Notable objects detected by the sensor are corrected based on their actual distance measurements, while other areas use the predetermined position stretching method. This localized differentiation allows each region to be optimized for its specific requirements, resolving the contradiction between overall distortion correction and local object shape accuracy.
Solution Approach 2:
The system dynamically changes the correction parameters based on detected object distance. By using the sensor to measure actual distance to notable objects, the correction algorithm adjusts its parameters specifically for these objects rather than applying a fixed stretching transformation. This parameter adaptation allows accurate representation of notable objects while maintaining the benefits of predetermined position correction for other areas.
2Area of stationary object
If a wide-angle lens is used to capture a wide field of view, then more area is visible, but distortion of captured images increases
Solution Approach 1:
The patent applies differential correction where notable objects are processed with distance-based correction to maintain their true shape, while other areas of the wide-angle image undergo predetermined position stretching. This allows the system to maintain the wide field of view advantage while locally correcting distortion for important objects.
Solution Approach 2:
The distance sensor acts as an intermediary that provides additional information about the real-world positions of notable objects. This sensor data mediates between the distorted wide-angle image and the desired accurate representation, enabling the controller to calculate corrected positions that preserve object shapes while maintaining the wide field of view.
3Manufacturing precision
If distortion correction stretches the image area, then horizontal alignment is achieved, but object positions and shapes become inaccurate
Solution Approach 1:
The system applies different correction methods to different objects based on their importance. Notable objects detected by the sensor have their positions and shapes preserved through distance-based correction, while other areas use the predetermined position stretching method to achieve horizontal alignment. This localized approach resolves the contradiction between overall alignment and local position accuracy.
Solution Approach 2:
The distance sensor provides feedback about the actual positions of notable objects, which is used to adjust the correction algorithm. This feedback loop allows the system to maintain horizontal alignment for the overall image while compensating for position and shape inaccuracies in notable objects based on real-world distance measurements.
Data Source
AI summary
A video display device includes a camera with a wide-angle lens that captures a two-dimensional wide-angle video around a vehicle, a sensor that measures the distance to objects in the real space around the vehicle, a controller connected to the camera and the sensor, and a display device that displays images based on signals output from the controller. The controller calculates the position of the object in the wide-angle video captured by the camera based on the distance to the object in the real space measured by the sensor and corrects the distortion of the wide-angle video so that the calculated position of the object in the wide-angle video becomes horizontal on the screen of the display device.