Square Root of Negative One

acquiring google map api key

Posted in android, coding by cheng on November 14, 2010

1. run cmd
navigate to D:\Program Files\Java\jdk1.6.0_22\bin in cmd line
(to change root directory- d: )

2. find the keystore file
assume it is in C:\Users\[useraccount]\.android\

3. run keytool
in cmd line, type in
keytool -list -alias androiddebugkey -keystore C:\Users\[useraccount]\.android\debug.keystore -storepass android -keypass android

4. For reference on API –

Example Using Google Maps in Android

video processing

Posted in coding by cheng on April 5, 2010


1. frame by frame motion detection (FD)

2. background substraction (BD)

3. with some noise threathhold

0.1*FD + 0.9* BD  = GD

dilate -fix holes..

erode -cut the outline

4. contour finder


projector projects no infrared light. nor fluorescent lights.  therefore, by using exposed b+w film as filter on monochromic camera, we can avoid feedback problem of projected image.

BNC connector + mechanical convertar ->  RCA connector -> computer

super circuit camera connector + clamp to mount it anywhere

KJ’s project?