acarabott

void createAlphaImage(const cv::Mat& mat, cv::Mat_<cv::Vec4b>& dst)
{
  std::vector<cv::Mat> matChannels;
  cv::split(mat, matChannels);
  
  // create alpha channel
  cv::Mat alpha = matChannels.at(0) + matChannels.at(1) + matChannels.at(2);
  matChannels.push_back(alpha);

  cv::merge(matChannels, dst);

acarabott

ssh-keygen -o -a 100 -t ed25519

acarabott

#include <functional>

using TrackbarAction = std::function<void(int)>;

cv::namedWindow("win");

cv::TrackbarCallback trackbarCallback = [] (int pos, void* userdata) {
  (*(TrackbarAction*)userdata)(pos);
};

acarabott

/* 
if you don't need to do any captures you can just do

cv::setMouseCallback("win", [] (int event, int x, int y, int flags, void*userdata) {
  std::cout << "mouse action!" << std::endl;
});

but if you need to do any captures, then you'll need to do this crap.
If you know of a better way then fork away...
*/

acarabott

#  -i input file
#  -r frames per second to extract
# -ss start time HH:MM:SS
#  -t duration to extract in seconds
#  -s image format (see below)
#     output file format where %d will be the image number
ffmpeg -i video.mp4 -r 25 -ss 00:01:22 -t 7 -s hd1080 output-%d.png

# Image formats
# -------------

acarabott

# useful for implementing output view auto scrolling, only when at the bottom

def view_is_at_bottom(view):
    layout_h = view.layout_extent()[1]
    view_h = view.viewport_extent()[1]
    view_y = view.viewport_position()[1]
    line_h = view.line_height()

    view_taller_than_content = layout_h <= view_h
    at_bottom_of_content = view_y + view_h >= layout_h - line_h

acarabott

DISPLAY=":0"
export DISPLAY

acarabott

void ofApp::setup(){
    myValue = 5;
    gui->addIntSlider("MY_INT_SLIDER", 0, 10, myValue);
}

void ofApp::guiEvent(ofxUIEventArgs &e)
{
    if (e.getName() == "MY_INT_SLIDER")
    {
        // the trick is in the cast....

acarabott

#!/bin/bash

# This lives in your project directory, alongside src/, bin/, config.make, etc

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
cd $DIR
make Debug && make RunDebug;

acarabott

<Directory "/Users/username/Sites/">
     # Options Indexes MultiViews
     Options Indexes MultiViews FollowSymLinks
     AllowOverride All
     Order allow,deny
     Allow from all
</Directory>