It's built with openFrameworks and makes use of the following addons:
This app demonstrates how to extract a collection of paths (
vector<ofPolyline>) from a webcam image in real time (every time you hit the space bar) using coherent line drawing with thresholding and morphological thinning, followed by a slow technique for extracting connected components in a way that focuses on longer paths.
Play a bit with the parameters for controlling coherent line drawing: black, sigma1, sigma2, tau, halfw, smoothPasses. Once you get these set up for a given lighting environment they should be fairly fixed and not require any tweaking for different people.
The thresh setting is post-CLD but is an important number to tweak before the results are thinned. After thinning, a collection of paths is generated using the minGapLength and minPathLength. minGapLength determines how big a jump is between two pixels before it's considered a "gap" (i.e., two disconnected lines). minPathLength determines how many pixels a path must contain in order to be included in the final collection. This helps remove very short paths (noise).
- tries to threshold somehow, maybe prethreshold
- level of detail, freq of image
- if both low, super detailed and jittery data
- if sigma2 or both high, all features will be swirly lower freq
- both high yields thick lines, most dominant edges; also ghost lines
- kind of related to high pass HDR look
- value of 1 (high) will create edges everwhere it can imaging
- high thresh gives more lines (more black), low gives less
- some measure of local vs. global complexity
- low gives lots of swirls, high gives longer lines
- tries to make contours smoother, low number is sharper
This app is based on firmataExample. It's modified to control a stepper motor via arduino and the EasyShield stepper driver.
Contains Arduino firmware, currently this is just Standard Firmata