Related Experiment Video
Updated: May 26, 2026
11:34
High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
Published on: December 3, 2013
Depth from motion and optical blur with an unscented Kalman filter
C Paramanand1, A N Rajagopalan
1Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai, India. paramanand@gmail.com
Summary
This study recovers 3D scene structure from motion blur and optical defocus. It uses differences in blur between images to estimate depth, employing an unscented Kalman filter for accurate results.
Area of Science:
- Computer Vision
- Image Processing
- 3D Reconstruction
Background:
- Space-variant blur in images encodes depth information.
- Recovering 3D scene structure from blur is a challenging problem.
Purpose of the Study:
- To develop a novel method for 3D scene structure recovery using motion blur and optical defocus.
- To leverage the difference in blur between image observations as a depth cue.
Main Methods:
- Utilizes an unblurred-image/blurred-image pair for motion blur analysis.
- Employs a recursive state estimation framework, specifically an unscented Kalman filter, for depth estimation.
- Handles arbitrary blur kernel shapes and addresses depth from defocus with translational jitter.
Main Results:
- Successfully recovers depth information from space-variant blur.
- Demonstrates effectiveness on both synthetic and real-world data.
- Provides performance comparisons against existing techniques.
Conclusions:
- The proposed unscented Kalman filter approach effectively estimates scene depth from blur.
- The method is robust to different blur types and camera motion.
- Offers a viable solution for 3D reconstruction from blurred imagery.
Related Concept Videos
01:24Absolute Motion Analysis- General Plane Motion
Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the drone...
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the drone...
01:15Depth Perception and Spatial Vision
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
01:25Relative Motion Analysis using Rotating Axes
Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it instrumental in...
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it instrumental in...
01:24Relative Motion Analysis - Velocity
A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
01:29Application of Linearization and Approximation
A drone flying through complex terrain often relies on more than one sensing method to estimate small changes in altitude. Along with direct measurements, air pressure provides a useful indirect indicator of vertical movement. Atmospheric pressure decreases as altitude increases, and this relationship is commonly described using an exponential model. Although accurate, converting pressure measurements into altitude values requires calculations that are too complex to perform repeatedly during...
01:27Uniform Depth Channel Flow
Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...