Abstract: Blasting video analysis techniques and systems are presented using vibration compensated background analysis with automated determination of blast origin coordinates and highest point coordinates using blast outline coordinates for post-origin frames. Blast expansion trajectories of the highest particle are estimated in frames preceding the highest point frame, and estimated blast parameters including maximum height and initial blast velocity are computed independent of blast data.

Abstract: Blasting video analysis techniques and systems are presented using vibration compensated background analysis with automated determination of blast origin coordinates and highest point coordinates using blast outline coordinates for post-origin frames. Blast expansion trajectories of the highest particle are estimated in frames preceding the highest point frame, and estimated blast parameters including maximum height and initial blast velocity are computed independent of blast data.

Abstract: An sequence of data samples X[n] is point symmetrically extended to provide an extended sequence of samples x[n]. The points of symmetry (25) can be at the ends (17, 19) of the sequence (as in FIG. 4 (a)), such that the samples at the ends are not duplicated but the points of symmetry are at the values of those samples. Thus, the extensions are formed by duplications (27) of a predetermined number of the other samples. Alternatively (as shown in FIG. 4 (b)), the points of symmetry (25) can be a half-sampling rate beyond (23, 25) the samples at the ends of the sequence so that those samples are also duplicated (27) to provide the extensions. For tiled image data, image compression and reconstruction utilising the point symmetric technique provides a very good reconstructed image with reduced artifacts at the tile boundaries.

Abstract: A method (20) for automatically focusing an optical instrument (1) having a lens (10) with only two focus positions. The method comprises acquiring a first image (21) when the lens (10) is in a first position (15) and thereafter processing pixel light intensities (22) of part of the image to provide a focus detection value indicative of image blurr. A threshold test (23) is then effected and if the focus detection value is outside a desired range the lens (10) is automatically moved to a second position (16).