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EyalAr /
Last active Jun 3, 2020
Shell script to easily export mongo collections into JSON files
#!/usr/bin/env bash
if [ -n "$1" -a "$1" = "--help" ]
EyalAr / hello_world_opencv.cpp
Created Oct 23, 2012
Hello World in OpenCV
View hello_world_opencv.cpp
#include "opencv2/opencv.hpp"
#include "opencv2/highgui/highgui.hpp"
using namespace cv;
int main(int argc, char** argv) {
//create a gui window:
EyalAr /
Created Dec 11, 2013
Demo code for my post about python's blocking stream reading functions.
from subprocess import Popen, PIPE
from time import sleep
# run the shell as a subprocess:
p = Popen(['python', ''],
stdin = PIPE, stdout = PIPE, stderr = PIPE, shell = False)
# issue command:
# let the shell output the result:
EyalAr /
Last active Jan 27, 2020
Count words in selection - plugin for Sublime Text 3. Full blog post:
import sublime, sublime_plugin, re
class CountWordsInSelectionCommand(sublime_plugin.EventListener):
def on_selection_modified(self, view):
listen to event 'on_selection_modified' and count words in all selected
regions when invoked.
EyalAr / registerS3ProtocolStreamWrapper.php
Last active Jan 29, 2019
Registering and using S3 protocol with AWS S3 stream wrapper for PHP
View registerS3ProtocolStreamWrapper.php
$s3 = new AmazonS3(array(
'key' => AWS_KEY,
EyalAr / gist:3018471
Created Jun 29, 2012
An explanation + examples about Java generics and bounded wildcards.
View gist:3018471
* Java Generics, Wildcards and Bounded Wildcards.
* ...Can be confusing. Here's a small explanation + examples.
import java.util.LinkedList;
import java.util.List;
EyalAr / ExtractEigenfaces.m
Last active Aug 17, 2017
Matlab script which extracts to files the eigenfaces of a set of face images.
View ExtractEigenfaces.m
% Extract the eigen-faces of a set of face images.
start_index = 1;
end_index = 10;
base_name = '';
extension = '.jpg';
in_dir = 'in';
out_dir = 'ef';
images = [];
EyalAr / InitPersonRecognizer.cpp
Last active Dec 1, 2016
Code snippets for my OpenCV face recognition tutorial, in which I show how to build an application which recognizes a specific person in a video. Full code at:
View InitPersonRecognizer.cpp
#define PERSON_LABEL = 10 //some arbitrary label
//LBPH face recognizer parameters:
#define RADIUS 1
#define NEIGHBORS 8
#define GRID_X 8
#define GRID_Y 8
#define THRESHOLD 130.0
//create a LBPH face recognizer model:
EyalAr / CsvWriter.hpp
Last active Dec 15, 2015
Code samples for my face detection and recognition with OpenCV tutorial.
View CsvWriter.hpp
class CsvWriter {
CsvWriter(const string &csvPath);
virtual ~CsvWriter();
void nextLine();
void addEntry(const string &s);
ofstream _fs;
bool _isFirstEntry;
EyalAr /
Last active Aug 29, 2015
Benchmarks of various nested loops control flow mechanisms in Javascript

MDN recommends NOT to use labels in Javascript, and instead use exceptions or functions. But turns out labels are the fastest, closely followed by named functions.

Test case: Run two nested loops. The inner loop needs to continue the outer loop upon some condition.


  1. Using named loops with labels.
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