Stereo-Image Parallax Offset Correction Using Apparent Size
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Solution Overview
Problem
Existing stereo-image processing apparatuses face accuracy issues in determining three-dimensional positions due to deviations in parallax offset values caused by camera misalignment or environmental factors, which are difficult to correct without using external references like screens or linear objects.
Innovation Solution
A stereo-image processing apparatus that detects and corrects parallax offset values using changes in parallax and apparent size of objects whose real-space size remains constant, such as a preceding vehicle, without requiring external references, by calculating a parallax error and adjusting the offset value accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the parallax offset value DP is fixed at the determined value, then the device complexity is reduced, but the measurement precision of three-dimensional position decreases when camera misalignment or environmental factors cause deviation
Solution Approach 1:
The patent transforms the fixed parallax offset value into a dynamic parameter that can be automatically adjusted. The system continuously monitors the apparent size of detected objects and compares it with stored reference size information to calculate size ratio values, using these to dynamically correct the parallax offset value DP in real-time, thereby maintaining measurement precision without requiring complex manual calibration procedures.
Solution Approach 2:
The patent implements a feedback mechanism where the system continuously monitors the apparent size of objects in the stereo images, compares this with stored reference size information, calculates size ratio values, and uses these feedback signals to automatically adjust the parallax offset value. This closed-loop feedback system corrects deviations caused by camera misalignment or environmental factors without external intervention.
2Measurement precision
If external references like screens or linear objects are used to correct parallax offset deviation, then the measurement precision is improved, but the device complexity and ease of operation deteriorate due to additional sensors or setup requirements
Solution Approach 1:
The patent enables the stereo-image processing apparatus to correct its own parallax offset deviation using objects that are already present in the environment and detectable by the camera system. The system uses the apparent size of detected objects (such as vehicles, pedestrians, or other three-dimensional objects) as self-reference to calculate size ratio values and automatically adjust the parallax offset value, eliminating the need for external calibration screens or linear reference objects.
Solution Approach 2:
The patent makes the detected objects serve dual purposes: they are both the target of three-dimensional position determination and the reference standard for parallax offset correction. The same objects used for navigation or monitoring functions also provide the reference information needed for calibration, thereby improving measurement precision without adding separate calibration hardware.
3Measurement precision
If external references like screens or linear objects are used to correct parallax offset deviation, then the measurement precision is improved, but the ease of operation worsens due to additional setup requirements
Solution Approach 1:
The system performs automatic self-correction of parallax offset deviation using objects naturally present in the environment. The processor continuously monitors object apparent sizes, compares with stored reference information, calculates size ratio values, and automatically adjusts the parallax offset value without requiring user intervention, calibration screens, or manual setup procedures, thereby maintaining ease of operation while improving measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows for precise correction of parallax offset values even in environments lacking linear objects, enhancing the accuracy of three-dimensional object detection and positioning without the need for additional sensors or screens.
Implementation Method 1
a three-dimensional position of the object is determined by triangulation based on parallaxes of the pixel regions
Implementation Method 2
dp represents the parallax between the corresponding pixel regions in the reference image and the comparative image
Data Source
AI summary
A stereo-image processing apparatus includes a stereo-image taking means configured to take a plurality of images from different viewpoints, a parallax detecting means configured to detect a parallax of a subject on the basis of the images taken by the stereo-image taking means, an object detecting means configured to detect objects on the basis of the parallax detected by the parallax detecting means and a parallax offset value, and a parallax-offset-value correcting means configured to correct the parallax offset value on the basis of a change in a parallax corresponding to an object whose size in real space does not change with time, of the objects detected by the object detecting means, and a change in an apparent size of the object.