Image Generating Apparatus Perspective Distortion Correction
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Solution Overview
Problem
Conventional monitoring systems face challenges in human detection due to perspective distortion, requiring multiple identifiers and increased processing time, especially with wide-angle and omnidirectional lenses, and existing image conversion methods are not applicable to normal lenses.
Innovation Solution
An image generating apparatus that converts images captured at an angle of depression by specifying a straight line through the imaging plane and a vertical vector, allowing for unified tilt representation of objects, thereby simplifying human detection and reducing the need for multiple identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple identifiers are used to detect all people in the image, then detection completeness is improved, but storage area and processing time increase
Solution Approach 1:
The patent applies parameter changes by transforming the image coordinate system and applying perspective distortion correction to unify the tilt of people in the image. This allows a single identifier to detect all people regardless of their position, eliminating the need for multiple identifiers with different tilt parameters. The coordinate transformation parameters are adjusted based on the camera's installation position and angle of depression to achieve uniform object orientation.
2Reliability
If more identifiers are used to detect all people, then detection coverage is improved, but device complexity increases
Solution Approach 1:
The patent implements universality by creating a single identifier that can detect all people in the image regardless of their position. The perspective distortion correction and coordinate transformation enable one identifier to function for the entire image area, replacing the need for multiple position-specific identifiers. This universal approach maintains detection coverage while reducing system complexity.
3Area of stationary object
If wide-angle lens is used to secure wide monitoring range, then monitoring coverage is improved, but perspective distortion increases
Solution Approach 1:
The patent introduces an intermediary processing step between image capture and detection: perspective distortion correction through coordinate transformation. This intermediary process compensates for the distortion introduced by wide-angle lenses, allowing the system to maintain both wide monitoring coverage and accurate object detection. The correction uses the camera's installation parameters as intermediaries to transform coordinates and eliminate distortion effects.
4Reliability
If image conversion is performed on omnidirectional image, then detection uniformity is improved, but applicability to normal lens decreases
Solution Approach 1:
The patent uses parameter changes to create a versatile solution that adapts to different lens types. Instead of using fixed image conversion methods for omnidirectional images, the system adjusts the coordinate transformation parameters based on the camera's installation position, angle of depression, and lens characteristics. This allows the same perspective distortion correction approach to be applied effectively to both omnidirectional and normal lenses, maintaining detection uniformity across different lens types.
Data Source
AI summary
An image generating apparatus which generates a second image that is an image converted from a first image captured by an imaging apparatus placed to be oriented downward at an angle of depression with respect to a horizontal direction includes: a specifying unit which specifies a straight line included in the first image and passing through an intersection between an imaging plane and a vertical vector; and an image extension processing unit which generates the second image by sampling pixels of the first image along the specified straight line.