Zooming video

Early systems based on visible light used high-zoom video cameras positioned to view the membrane from the side. The ability to continuously record, in real time, activity at the membrane surface made this type of system ideal for in situ imaging of cake deposition, provided the particles were sufficiently large. A 15 x zoom video camera was used to record in situ particle motion of large polyethylene particles (125-180 pm) dose to a stainless steel mesh filter 3]. The particles in this study were much larger than those typically found in microfiltration applications. Another study [4] used a similar system to record the deposition of more realistic caldte (2.6 pm, 25 pm) and anatase (0.5 pm) particles. Individual particles could not be resolved and only a cake thickness was quoted. In both studies the cakes thicknesses were in the millimeter range. 

The zoom optics between the image intensifier and the video camera gives the freedom to magnify details of the image for more detailed inspection. 

Here we introduce the idea of a software system we wish to build, and explore the roles it plays from the viewpoints of various users and areas of activity. Effectively, this means zooming in on the interactions of the Business Model, to understand exactly what goes on when, for example, a customer hires a video. It is often useful to build and compare descriptions of what happens now (with a manual or old system) and what will happen when our new system is installed though only the latter is illustrated here. 

The PROTECT architecture consists of sensors deployed in various subway stations, complemented by closed-circuit television (CCTV) cameras that have automated and manual pan-tilt-zoom capabilities. These sensor and camera combinations provide data continuously to a centralized chemical-biological emergency management information system (CB-EMIS developed by Argonne National Laboratory) located in a centralized WMATA operations control center. In addition to the sensor and video data from the stations, train operation data and ambient meteorological data are also ported to the CB-EMIS system. Under normal operations, CB-EMIS can provide operator access to the multiple fixed and movable cameras throughout the metro system to assist law enforcement officers or firefighters. It also monitors the status of the sensor systems deployed in the metro. 

A computer that records the digital videos from multiple cameras positioned to view the flare tests from various directions (see Figure 28.10). These cameras (with pan-tilt-zoom capabilities) are operated from the control room. Videos record multiple frames per second and can be played back simultaneously using a Multiplexer. 

High-resolution video camera with zoom. 

Together with the particular features noted above, the console contains controls for the camera head lighting (2 x 800W and 2 x 300W) zoom lens controls (focus, iris, and zoom) camera pan and tilt indicators for camera temperature with audible warning of high temperature TV monitor and video switching for interconnection to other camera/vldeo systems and a U-Matic video cassette recorder. 

Video camera systems are available from several manufacturers for documentation and densitometric quantification of TLC plates. As an example, the Camag VideoScan (Fig. 6) consists of the VideoStore documentation system, which includes a lighting module with short- and longwave UV and visible sources upon which the layer is placed, a CCD camera with zoom and long-time... 

The Perkin Elmer FT-IR microscope features compact Cassegrain optics, fixed stereo, zoom stereo, and video viewing points, a vernier calibrated sample stage, multiple illumination positions, high sensitivity, reproducibility, and ease of operation. 

A simple technique for measuring the radius of a drop is to image it on a screen with a video camera equipped with a zoom lens (using a magnification of typically 20x) (Figure 2.11). Lengths can be measured with an accuracy of about 100 pm. 

Figure 9.3 Camag VideoStore system including Reprostar 3 transilluminator with cabinet cover, camera support, and video camera with zoom objective. (Photograph courtesy of Camag.)...

Video events snap to the grid marks in a project, which demarcate measures and beats. At higher zoom levels, when individual frames can be resolved, video events also snap to frame boundaries. This behavior can be toggled on and off by pressing F8 on your keyboard. 

When dropping a marker on an exact frame boundary at a high zoom level, you may notice that it does not seem to be at the boundary after you zoom back out Trust the marker and not the tbmnbnail representations on the video. Watch the Video preview window to verify this, because it always displays the exact frame at the cursor position. In this situation, the arrow keys are very useful for moviug hack and forth in the project a fiame or so at a time. 

The entire project will shift relative to the video (and any other One-Shot tracks, such as the audio from the video file) as a result of a change in tempo. In this example, the tempo will speed up to 128.564, as you can see in Figure 11.7. If you zoom in on the marker position, it will still be exactly where it was before in the video and, thus, at exactly the same position relative to time in the real world. In relation to the project, looped or Beatmapped tracks, and events, however, it is in a completely different position. The tempo difference from 120 to 128 is not that great, but it is noticeable even though ACID will make sure the pitch of the events does not shift. Here we moved only a little over a measure in a project that lasts almost four minutes, but... 

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