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Target issues for a web-cam switch

| tags: blind, deaf, enabling technology

I can reliably detect many simple targets and generate key events in real time using a web-cam and an ordinary piece of paper with printed targets. What are the important characteristics of the targets?

  1. They must be meaningful to the user.
  2. They must be detectable and easily distinguished from whatever will obscure them by the computer.
  3. They must have an associated key, mouse or other event to control the computer.

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DtL: Derive to Latex Conversion

| tags: programming

This page describes a little utility I wrote for my own use. If you want to use it, you can download it and its source. I don’t provide support but if you would like to report bugs you’ve found or changes you’ve made to it, I’d be happy to hear about it.

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Beam size

| tags: home

Kelly's engineer estimates beam thickness as 1/2 inch per foot of span.

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Camtasia Studio Rocks!

| tags: random

I finally used the copy Camtasia Studio I bought to make a couple of short videos demonstrating computer vision methods. After setting the encoders up properly I got fine looking video and good audio in a 1 megabyte download.

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Synthesizing key events in windows

| tags: programming

For my video switch I want to be able to synthesize key events that look like they originated from the keyboard. The function SendInput in the user32.dll looks like the right low-level goods but Pete points out that the WScript.Shell has a SendKeys method that is easier to use. The Python code looks like:

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