The paper considers two problems associated with the detection and classification of motion in image sequences obtained from a static camera. Motion is detected by differencing a reference and the “current” image frame, and therefore requires a suitable reference image and the selection of an appropriate detection threshold. Several threshold selection methods are investigated, and an algorithm...

We propose algorithm for local image difference measurement for multimodal image data based on value of mutual information of both images. Algorithm works with registered gray-level images. Similarity measure takes into account entropy of compared images. Results of proposed algorithm can be used for image comparison and better difference localization. Introduction Multimodal data sets are nowa...

• Table S6: Harmonic vibrational frequencies at the ωB97X-D/aug-cc-pVTZ level using SG-2 and SG-3. In this case, analytic Hessians are available in QChem so we compare these analytic results to frequencies computed via finite difference of analytic gradients. Results show that there is very little difference between the two approaches, which validates other finite-difference frequencies reporte...

Fractal image coding suffers from its long encoding time. Block classification is often used to speed up coding processing, which uses some mechanism of classification when coding an image and only does match job for domain and range blocks with some similar features. D. Saupe’s classification algorithm of nearest neighbor search in feature space seems to have the best rate-distortion property ...

In the context of difference image analysis (DIA), we present a new method for determining the convolution kernel matching a pair of images of the same field. Unlike the standard DIA technique which involves modelling the kernel as a linear combination of basis functions, we consider the kernel as a discrete pixel array and solve for the kernel pixel values directly using linear least-squares. ...

A.A.M. Kuijk Department of Interactive systems, CWI K ruislaall 413, 1098 Sf Amsterdam, The Netherlallds Email: [email protected] A diffetence engine is described that is designed to be used as low level component of a raster graphics architecture. The speed of the system (11 ns per operation) is achieved by the use of custom VLSI components for the most primitive operations. This permits the video...

There are a number of ways to reproduce an image, for an example gamut mapping, halftoning and compression. To find the best reproduction among a number of variants of the same reproduction algorithm, a psychophysical experiment can be carried out. Image difference metrics have been introduced to eliminate these experiments. To do this the metrics must reflect the perceived image difference. On...

We introduce the use of mimetic methods to the imaging community, for the solution of the initial-value problems ubiquitous in the machine vision and image processing and analysis fields. PDE-based image processing and analysis techniques comprise a host of applications such as noise removal and restoration, deblurring and enhancement, segmentation, edge detection, inpainting, registration, mot...

Even though there is still room for improvement, recent perceptual image-difference measures show a prediction performance that makes them interesting to be used as objective functions for optimizing image processing algorithms. In this paper, we use a color enhanced modification of the Structural Similarity (SSIM) index for optimizing gamut mapping. An iterative algorithm is proposed that mini...