yiling-chen’s gists

yiling-chen / unorder-map-usage.cpp

Created February 5, 2018 16:47

	int majorityElement(vector<int>& nums) {
	unordered_map<int, int> counter;

	for (auto num : nums) {
	if (counter.count(num))
	counter[num] += 1;
	else
	counter[num] = 1;
	}

yiling-chen / serialize-deserialize.cpp

Created January 4, 2018 03:29

Serialize and deserialize a binary search tree(BST) to make the string to transmit or store as short as possible.

	struct TreeNode {
	int val;
	TreeNode *left;
	TreeNode *right;
	TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
	};

	class Codec {
	public:

yiling-chen / demo.cpp

Created November 13, 2017 23:02

Usage of OpenCV C++ API to perform objection detection using MobileNet and SSD

	#include <opencv2/dnn.hpp>
	#include <opencv2/imgproc.hpp>
	#include <opencv2/highgui.hpp>
	#include <opencv2/core/utils/trace.hpp>
	using namespace cv;
	using namespace cv::dnn;
	#include <fstream>
	#include <iostream>
	#include <cstdlib>
	using namespace std;

yiling-chen / gen_filelist.py

Created September 1, 2015 02:41

	#!/usr/bin/env python
	# -- coding: utf-8 --
	'''
	This simple script generates the high/low ranked image list from the AVA dataset.
	It also copies/resizes the source images to a specified folder.
	This script is assumed to be placed in AVA_ROOT with a folder name 'images', which contains all the source images.
	Make sure you alter the hard-coded path before using this script.
	'''

yiling-chen / dpchallenge_crawler.py

Last active September 1, 2015 02:36

	#!/usr/bin/env python
	# -- coding: utf-8 --
	'''
	A simple script to download the images specified in the AVA dataset from dpchallenge.
	This script is assumed to be placed in AVA_ROOT which contains a folder named 'images'.
	'''


	import os
	import urllib2

yiling-chen / gist:88f263804b4cc764b6fa

Created March 22, 2015 14:50

Convert a fisheye image to panorama view

	#include <cmath>
	#include <iostream>
	#include <opencv2/opencv.hpp>

	using namespace cv;

	int main(int argc, const char * argv[]) {
	Mat img = imread("lillestromfisheye.jpg");

	// assume the source image is square, and its width has even number of pixels

yiling-chen / list_image_files_in_directory.cpp

Last active December 21, 2015 06:38

List all image files (jpeg) in a specific folder.

	#include <string>
	#include <iostream>
	#include <boost/filesystem.hpp>
	#include <boost/algorithm/string.hpp>

	using namespace boost::filesystem;
	using std::endl;
	using std::cout;
	using std::cerr;

yiling-chen / integral_basics.cpp

Created August 14, 2013 03:02

Toy example of computing and manipulate integral image by OpenCV.

yiling-chen / render_remote_image.cpp

Last active May 26, 2020 05:17

Use libcurl to get a remote image file and render by OpenCV.

	//==================================================================================
	// Description : Use libcurl to get a remote image file and render by OpenCV
	// Based on the example from http://curl.haxx.se/libcurl/c/getinmemory.html
	//==================================================================================

	#include <stdio.h>
	#include <stdlib.h>
	#include <curl/curl.h>

	#include <opencv2/opencv.hpp>

Yi-Ling Chen yiling-chen