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Letterspace pc1/25/2024 >ago there was a study at Stanford University that indicated the bimorph > In the past 40 years, there have been some significant advances >Optacon, perhaps justifying a name for the new model as "Optacon HD" for >increase the number of pixels to 432, compared to the 144 in the original >and horizontal resolutions being the same. >Thus, the newly designed Optacon's pixels would be square, with the vertical >12 columns across the same horizontal field of view as the original Optacon. > Based on these considerations, I suggest that a new design have >tests with human subjects clearly showed that reading accuracy increased as >one column of pixels moved horizontally across the letterspace. All of the image information can be obtained from >in the vertical direction, but an analog signal is obtained horizontally >camera is moved along a horizontal line of text the letterspace is sampled >rectangles that were twice as wide as they were high. > In the original Optacon design, the pixels were not square, but >one of the reasons reading is more difficult with it. This reduction in resolution and field of view was > Unfortunately, the Optacon II, which was designed by Canon, had >resolution and greater field of view should be considered. >a goal of basing a new design on 36 vertical pixels to provide both improved >and field of view possible at a reasonable cost. > Fortunately, advances in technology make an improved resolution >change from a 480 line interlaced scan to a 1080 progressive line scan. >the greatly enhanced picture quality resulting from the recent television >fonts and text quality, more pixels would certainly be better, analogous to > Thus, for ease of tracking and reading a wider range of text >view of a new design could be greater, thereby relaxing the precision needed So reading would be easier and faster if the field of >Optacon camera requires this scan to be very precise else the images of the >the hand held camera along a line of text. > In addition, reading with an Optacon requires the user to move >letterspace is equivalent to a visual resolution of only 20/40. Also, the Optacon's 24 pixels across a 0.1 inch >dots/inch compared to the 300 dots/inch typically considered to be the >24 pixels across a 0.1 inch letterspace, this is equivalent to only 240 >reading and tracking text at a practical speed. >with human subjects that indicated this was the minimum number of pixels for >6 columns of pixels that drove a corresponding array of 24 rows and 6 > The original Optacon was designed around an array of 24 rows and >them to assign priorities could help the process toward a new Optacon. Not all of these ideas may be worth developing, but considering Below are my thoughts on design possibilities that could be >simplicity of the original Optacon while enabling new capabilities and > To reach the widest possible market, it is important to keep the >resolution, be easier to learn and use, and could have features that would >in technology make possible a new Optacon design that could have greater > Now, almost 40 years after the original Optacon design, advances >trying to maintain their Optacons and demanding a new Optacon. >production for over fifteen years, there are still over 150 avid users However, for those that mastered its use, the >together with the small market, made the Optacon a difficult product to > The custom integrated circuits and unique piezoelectric reeds, >photocells, and custom integrated circuits of shift register/bimorph >of piezoelectric reeds, or bimorphs, a custom integrated array of silicon >The final design incorporated a novel array of tactile stimulators composed >sighted, that used computer simulation of various designs to determine the >design was based on extensive experiments with human subjects, blind and >integrated circuits, silicon photocell arrays, and before microprocessors. > The Optacon was designed in the late sixties at the dawn of Old-timers among us will know who he is - the rest will just have to People might be interested to read this message from Jim Bliss. Reply: Robert Jaquiss: "Re: New Optacon Contemplations".Next in thread: Robert Jaquiss: "Re: New Optacon Contemplations".Previous message: Robert Jaquiss: "Fw: E-Access Bulletin: Issue 109, January 2009".Next message: Robert Jaquiss: "Re: New Optacon Contemplations". NFB-RD: New Optacon Contemplations New Optacon Contemplations From: David Andrews ( Mon 18:14:29 PST
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