Ray-tracing computations for structured-light projection systems with mirrors and windows
Structured-light systems assisted by mirrors or protected by windows are studied. Read more
Nonhomogeneous smoke mitigation in laparoscopic images using a hybrid physical-neural model
A visibility restoration method for surgical smoke-degraded images is proposed. Read more
Calibration of multimodal 3D structured-light systems using digital features
A fringe projection system complemented with a thermal camera is calibrated. Read more
Optical fringe projection: a straightforward approach to 3D metrology
An overview of the fundamentals of fringe projection profilometry is provided. Read more
Phase feedback fringe projection profilometry for shiny objects
A new adaptive fringe projection strategy using a phase feedback loop is proposed. Read more
Reliable disparity estimation using multiocular vision with adjustable baseline
A multicamera system for depth estimation using variable baseline is proposed. Read more
Flat mirrors, virtual rear-view cameras, and camera-mirror calibration
Camera-mirrors setups must be calibrated as virtual rear-view cameras. Read more
Restoration of binocular images degraded by optical scattering through estimation of atmospheric coefficients
A binocular system for restoring images captured in a scattering medium is presented. Read more
Are camera, projector, and camera–projector calibrations different?
No. This paper presents a unified calibration methodology. Read more
Three‐dimensional spatial point computation in fringe projection profilometry
Eight 3D point computation methods for fringe projection profilometry are presented. Read more
Stereo image matching using adaptive morphological correlation
An optimal adaptive correlator for stereo-matching is presented. Read more
Stereo-phase rectification for metric profilometry with two calibrated cameras and one uncalibrated projector
A phase rectification method minimizing the perspective distortion is proposed. Read more
Homography estimation from a single-point correspondence using template matching and particle swarm optimization
A homography estimation method working with one corresponding point is proposed. Read more
Distorted pinhole camera modeling and calibration
A generalized camera model that includes telecentric, pinhole, and fisheye, and its calibration method are proposed. Read more
Facial landmark detection and tracking with dynamically adaptive matched filters
Facial landmarks are features describing shape, color, or texture of face images. Landmark detection is essential for... Read more
Multi-demodulation phase-shifting and intensity pattern projection profilometry
Intensity patterns, which encode multiple phase functions, increases the efficiency of phase-shiting by reducing the number of... Read more
Adaptive matched filter for implicit-target recognition: application in three-dimensional reconstruction
Matched filters require explicit knowledge of the target. This avoids application where targets are unknown or dynamically changing... Read more
Key concepts for phase-to-coordinate conversion in fringe projection systems
Advanced fringe projection systems with cameras and projectors arranged arbitrarily are modeled using four key concepts. Read more
Flexible camera-projector calibration using superposed color checkerboards
Calibration of structured-light systems is difficult because the camera and projector must be calibrated together... Read more
How do phase-shifting algorithms work?
The fundamentals behind well-established phase-shifting algorithms are presented. This work is useful for the optics laboratory... Read more
Homography estimation by two PClines Hough transforms and a square-radial checkerboard pattern
We show that homographies can be obtained using only three particular points... Read more
Real-time haze removal in monocular images using locally adaptive processing
Visibility restoration is challenging when only monocular images are available, and a real-time image processing is required... Read more
Operator-based homogeneous coordinates: application in camera document scanning
This paper exposes the homogeneous coordinates using an intuitive operator-based approach for computer vision applications. Read more
Estimation of amplitude and standard deviation of noisy sinusoidal signals
Estimation of sinusoids with unknown phase is biased because of noise. We present an unbiased estimation method for unknown... Read more
Single-shot camera position estimation by crossed grating imaging
Optical applications, robot vision, and augmented reality guiding require the position of cameras to a reference plane in real-time... Read more
Nonparaxial geometrical Ronchi test for spherical mirrors: an inverse ray-tracing approach
Usually, ronchigrams are generated by the direct ray-tracing method, but irregular sampled images (scattered pixels) are produced... Read more
Intensity normalization of additive and multiplicative spatially multiplexed patterns with n encoded phases
Fringe-patterns encode only one phase map. When multiple phase maps are encoded, the result is an intensity pattern. Read more
Camera calibration by multiplexed phase encoding of coordinate information
A camera calibration method by phase encoding using a crossed grating on the reference plane is proposed. Read more
Theory and algorithms of an efficient fringe analysis technology for automatic measurement applications
Phase demodulation is a staple requirement for applications in physics, engineering, medicine, biometry, and many others... Read more
Generalized phase-shifting algorithm for inhomogeneous phase shift and spatio-temporal fringe visibility variation
A phse-shifting algorithm supporting unknown phase shifts that are nonlinear in both time and space is proposed. Read more
Phase-unwrapping algorithm by a rounding-least-squares approach
A noniterative phase-unwrapping algorithm, which operates over the gradient of the phase jumps, is proposed. Read more
Phase-shifting interferometry based on the lateral displacement of the light source
Lateral displacements of the light source in the Twyman-Green Interferometer induce phase shifts without expensive or cumbersome... Read more
Fourier normalized-fringe analysis by zero-order spectrum suppression using a parameter estimation approach
Degradation by the zero-order spectrum in the Fourier fringe analysis is analyzed. We improvement the accuracy using... Read more
Generalized phase-shifting interferometry by parameter estimation with the least squares method
Phase-shifting for two or more frames with arbitrary and unknown phase shifts is possible. A new method applying... Read more