![]() >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".This is consistent with the XeTeX behaviour (and the amount of stretching should be similar).NFB-RD: New Optacon Contemplations New Optacon Contemplations From: David Andrews ( Mon 18:14:29 PST After luaotfload v2.96, letterspace changes the word space: Prior to luaotfload v2.96, letterspace does not change the width of word space. ( fontspec users will do something like \setmainfontįor LuaTeX (which I’m not familiar with), users access fonts through luaotfload. \font\2=":letterspace=5" at 10pt % add 5% em of letterspace On the primitive level, letterspacing is added by specifying a numerical value to the letterspace key: \font\1="" at 10pt % no letterspace To illustrate, I will use an example under XeTeX. For example, the microtype package (pdfLaTeX) and the fontspec package (XeLaTeX, LuaLaTeX).īut what exactly do letterspace change? Also, the changes seem to be engine-dependent: pdfTeX, XeTeX, and LuaTeX are doing their own things. LaTeX users can access letterspacing via higher interface. All major engines (pdfTeX, XeTeX, and LuaTeX) support letterspacing, except the original TeX of course.
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