nkint

import itertools as it

def setness(f):
        setness.calls = dict()
        def decorator(arg):
                seen = setness.calls.get( arg, set() )
                for i in seen: yield i
                for i in f(arg):
                        if i not in seen:
                                seen.add(i)

nkint

    cv::Mat n = ...
    
    QPixmap p = QPixmap::fromImage(QImage((unsigned char*) n.data,
                                   n.cols,
                                   n.rows,
                                   QImage::Format_RGB888));
    p = p.scaledToWidth(500);
    
    label->setPixmap( p );

nkint

    cv::Mat original = //...

    QImage qtFrame(original.data, original.size().width, original.size().height, original.step, QImage::Format_RGB888);
    qtFrame = qtFrame.rgbSwapped();

    m_GLFrame = QGLWidget::convertToGLFormat(qtFrame);
    
    glColor3f(1, 1, 1);
    glEnable(GL_TEXTURE_2D);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);

nkint

import os, sys
rootdir = sys.argv[1]
for root, subfolders, files in os.walk(rootdir):
    dirs = [ os.path.abspath(rootdir)+ root[1:] + "/" + s for s in subfolders ]
    for d in dirs: print d

nkint

displayDebug = ....

// turn black pixels into alpha 0
if(displayDebug.channels()==1)
    cv::cvtColor(displayDebug, displayDebug, CV_GRAY2BGR);
cv::cvtColor(displayDebug, displayDebug, CV_BGR2BGRA);
for (cv::Mat4b::iterator it = displayDebug.begin<cv::Vec4b>(); it != displayDebug.end<cv::Vec4b>(); it++) {
    if (*it == cv::Vec4b(0, 0, 0, 255)) {
        *it = cv::Vec4b(0, 0, 0, 0);
    }

nkint

cv::Rect roi( cv::Point( originX, originY ), smallImage.size() );
smallImage.copyTo( bigImage( roi ) );

nkint

i=1
for avi in *.mp4; do
    name=`echo $avi | cut -f1 -d'.'`
    jpg_ext='.jpg'
    echo "$i": extracting the first frame of the video "$avi" into "$name$jpg_ext"
    ffmpeg -loglevel panic -i $avi -vframes 1 -f image2 "$name$jpg_ext"
    i=$((i+1))
 done

nkint

import numpy as np
import cv2
import os

# this two lines are for loading the videos.
# in this case the video are named as: cut1.mp4, cut2.mp4, ..., cut15.mp4
videofiles = [n for n in os.listdir('.') if n[0]=='c' and n[-4:]=='.mp4']
videofiles = sorted(videofiles, key=lambda item: int( item.partition('.')[0][3:]))

video_index = 0

nkint

void displayText(const QString &text, const QColor &backgroundColor, const QColor &textColor, const Vec3D &pos)
    {
        // some magic number (margin, spacing, font size, etc..)
        int fontSize = 15;
        int text_width=text.size()*(fontSize/1.5)+5, text_height=fontSize+20;
        
        // create the QImage and draw txt into it
        QImage textimg(text_width, text_height, QImage::Format_RGB888);
        {
            QPainter painter(&textimg);

nkint

find `pwd`