HiCraigChen’s gists

HiCraigChen / copy files from docker.sh

Last active September 19, 2019 04:00

copy files from docker

	# Open another terminal to find your running container id
	docker ps
	# CONTAINER ID IMAGE COMMAND...
	#<CONTAINER ID> py36lambda "bash" ...

	# Copy the files from container to local
	docker cp <CONTAINER_ID>:/path/to/file/in/docker /path/to/local/directory

HiCraigChen / Get package files.sh

Created September 19, 2019 04:10

Get package files

	# Install two utilities to download and extract .rpm files
	yum install yum-utils rpmdevtools

	# Download .rpm files
	yumdownloader <package_name>

	# Extract files from .rpm
	rpmdev-extract *.rpm

HiCraigChen / app.py

Last active September 20, 2019 04:43

pdftotext python code

	from chalice import Chalice
	import os

	app = Chalice(app_name='pdftotext')

	@app.route('/')
	def index():
	# Get a sample pdf file
	os.system("curl https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf -o /tmp/file.pdf")

HiCraigChen / app.py

Last active September 25, 2019 01:10

Convert PDF to image using Python wand library

	from wand.image import Image
	import os

	# Download and read pdf file
	os.system("curl https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf -o /tmp/file.pdf")
	f = open('/tmp/file.pdf','rb')
	infile = f.read()
	f.close()

	with Image(blob=infile,resolution=150) as img_pdf:

HiCraigChen / app.py

Last active February 9, 2023 13:39

Convert PDF to image using Python with pdf2image library

	from chalice import Chalice, Response
	from pdf2image import convert_from_bytes
	import os
	from io import BytesIO

	app = Chalice(app_name='pdf2image')


	@app.route('/')
	def index():

HiCraigChen / bluetooth_test.py

Last active August 13, 2020 12:54

Enable bluetooth socket (server socket) to communicate with other device (client socket) using python

	import bluetooth

	server_socket=bluetooth.BluetoothSocket( bluetooth.RFCOMM )
	port = 1
	server_socket.bind(("",port))
	server_socket.listen(1)
	client_socket,address = server_socket.accept()
	print("Accepted connection from ",address)

	while True:

HiCraigChen / bluetoothWithSubprocess.py

Created December 23, 2019 05:16

	import bluetooth
	import subprocess
	class BluetoothComm:
	def __init__(self):
	self.server_socket=bluetooth.BluetoothSocket( bluetooth.RFCOMM )
	port = 1
	self.server_socket.bind(("",port))
	self.server_socket.listen(1)
	self.client_socket,address = self.server_socket.accept()
	print("Accepted connection from ",address)

HiCraigChen / FFT.py

Last active July 17, 2020 00:42

	import cv2
	import numpy as np
	import matplotlib.pyplot as plt

	plt.figure(figsize=(6.45, 4.85), constrained_layout=False)

	img_c1 = cv2.imread("left01.jpg", 0)
	img_c2 = np.fft.fft2(img_c1)
	img_c3 = np.fft.fftshift(img_c2)
	img_c4 = np.fft.ifftshift(img_c3)

HiCraigChen / IdealFilter.py

Created February 16, 2020 23:50

	def distance(point1,point2):
	return sqrt((point1[0]-point2[0])2 + (point1[1]-point2[1])2)

	def idealFilterLP(D0,imgShape):
	base = np.zeros(imgShape[:2])
	rows, cols = imgShape[:2]
	center = (rows/2,cols/2)
	for x in range(cols):
	for y in range(rows):
	if distance((y,x),center) < D0:

HiCraigChen / ButterworthFilter.py

Created February 16, 2020 23:51

	def distance(point1,point2):
	return sqrt((point1[0]-point2[0])2 + (point1[1]-point2[1])2)

	def butterworthLP(D0,imgShape,n):
	base = np.zeros(imgShape[:2])
	rows, cols = imgShape[:2]
	center = (rows/2,cols/2)
	for x in range(cols):
	for y in range(rows):
	base[y,x] = 1/(1+(distance((y,x),center)/D0)*(2n))

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