BaristaBot

This repository contains code for an upcoming installation at SXSW. It's built with openFrameworks and makes use of the following addons:

• ofxCv
• ofxControlPanel

CoherentLinePlanning

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).

Black

• tries to threshold somehow, maybe prethreshold

Sigmas

• 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

Tau

• kind of related to high pass HDR look
• value of 1 (high) will create edges everwhere it can imaging

Thresh

• high thresh gives more lines (more black), low gives less

Halfw

• some measure of local vs. global complexity
• low gives lots of swirls, high gives longer lines

Smoothpasses

• tries to make contours smoother, low number is sharper

StepperTest

This app is based on firmataExample. It's modified to control a stepper motor via arduino and the EasyShield stepper driver.

ArduinoCode

Contains Arduino firmware, currently this is just Standard Firmata