Distorted pinhole camera modeling and calibration
A generalized camera model and its calibration method are proposed. This approach includes telecentric, pinhole, and fisheye as particular cases. Read more.
Papers
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.
Matched filters require explicit knowledge of the target. This limits the usefulness when targets are unspecified 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 for 3D imaging is difficult because the camera and projector must be calibrated together... Read more.
How do phase-shifting algorithms work?
The fundamentals behind seven 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
Homographies are crucial for camera calibration and other applications. We show that homographies can be obtained using only three... 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
Homogeneous coordinates are essential for vision-based applications. This paper presents an intuitive approach from the computer vision... 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. However, irregularly sampled images (scattered pixels) are produced... Read more.
Fringe-patterns encode only one phase distribution. When more than one phase distribution 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 and coordinate transformation is proposed. We use a crossed grating on the reference... Read more.
Phase demodulation is a staple requirement for applications in physics, engineering, medicine, biometry, and many others... Read more.
Usually, phase-shifting algorithms assume linear shifts of time and space. However, this requirement is not always satisfied in practice. 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. No expensive or cumbersome devices... Read more.
The degradation by the zero-order spectrum in the Fourier fringe analysis is analyzed. The improvement using fringe pattern normalization is... 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 fringe pattern normalization... Read more.