Since the last major post, I have acquired 3 USB microscopes. These are not full-fledged microscopes, but devices that have zoom factors and light sources. One comes with screenshot/video recording software. I used this to examine a phonograph needle on my turntable. I had enough detail to determine the source of a playback problem. As a result, I purchased a new stylus and now enjoy my LP collection.
As a precursor, let me reiterate, these blogs are for intelligent people with a university background and courses in mathematics, engineering, physics and other of the hard sciences. The first HDR image was the result of the independent work of Prof. Paul Debevec, U.C., and Gregory Ward Larson, JPL. Prof. Debevec developed an algorithm to composite several images into one. His work was published in a research paper still available online. In the back of the paper is a Matlab script of the algorithm. Matlab is published by Mathworks, Inc, and is the foremost mathematics laboratory, Matlab is widely used by scientists and professionals in a science related field. One of the unknown benefits in HDR is the ability two construct an HDR image with only two exposures (images) if the same film is used for several images. Prof. Debevec derived an additional algorithm for determining the film character and using that data to reduce the...
The Canon 8800f originally came boxed with accessory fixtures for scanning films of different types. I didn't want to spend $50 on eBay if I do without, so I developed workarounds. Scanners have CCDs that act like cameras. And like cameras, they have a focal length. Theirs is fixed. I read an interesting article on testing the focal length of scanners. That article gave me an idea. I got a piece of window pane glass and cut the glass to fit on the scanner glass bed, referred to as the 'Platen.' I did some test scans of old ruined negative film that had highly detailed, sharp etch marks that woiuld work as an indicator of level of detail. The window pane was placed on the platen and scans made at high resolution. The pane was removed and a similar set of scans made. The two sets were examined in the sharply deailed damage area of the film negative. The detail was clearer on the platen than on the pane. The glass window pane was kept as a way to insure the images were flat o...
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