Showing papers on "Digital image correlation published in 1984"
TL;DR: Monte Carlo simulations of image correlation using low light-level scenes are found to be in close agreement with the theoretical predictions of photon-limited image correlation.
Abstract: The effectiveness of photon-limited image correlation for recognition of realistic imagery is investigated. The correlation signal is obtained by cross correlating a low light-level input scene and a high light-level reference image. The dependence of the probability density function of the correlation signal on the average number of detected photoevents and on the number of gray levels in the images is illustrated. Monte Carlo simulations of image correlation using low light-level scenes are found to be in close agreement with the theoretical predictions.
28 citations
01 Mar 1984
TL;DR: A scheme wherein a simple algorithm for calculating single displacement vectors is applied over numerous subimages to create a displacement field is proposed, based on the 1D (one-dimensional) Fourier transform.
Abstract: This paper describes a new technique for calculating the displacement field in a motion sequence of two-dimensional imagery generated by a moving sensor. It proposes a scheme wherein a simple algorithm for calculating single displacement vectors is applied over numerous subimages to create a displacement field. This algorithm is an application of the MDT (motion detection transform) [15,16], thus is based on the 1D (one-dimensional) Fourier transform.
4 citations
01 Mar 1984
TL;DR: In this article, the applications of photo-activated, CCD-addressed, and variable-grating mode liquid crystal light valves (LCLVs) to optical data processing are described.
Abstract: The applications of the photo-activated, the CCD-addressed, and the variable-grating mode liquid crystal light valves (LCLVs) to optical data processing are described. These applications include image correlation, level slicing, spectral analysis and correlation, bi-spectral image division, and matrix-matrix multiplication.
3 citations
01 Jan 1984
2 citations
01 Jan 1984
TL;DR: An experimental hardware and software configuration has been established with which the on line application of digital image correlation for conventional photogrammetric measuring tasks can be tested and first results of calibration and performance of the system are presented.
Abstract: A procedure fo r digital image correlation is described which is based on least squares window matching. The immediate aim is high precision parallax assess ment, point transfer, and point measurement. Experiments and theory have confirmed the high accuracy potential of the method. By implementation of charge coupled device ( CCD) video cameras in an analytical plotter, an experimental hardware and software configuration has been established with which the op erational on line application of digital image correlation fo r conventional photogrammetric measuring tasks can be tested. First results of calibration and performance of the system are presented. They allow op timistic conclusions as to the fu rther development and practical application of digital image processing in photogrammetry.