cam.py

import cv2 as cv
import numpy as np
import os
import sys
import platform
from pynput.keyboard import *

def on_press(key):
	finish(key)

def on_release(key):
	pass

listener = Listener(on_press=on_press, on_release=on_release)

def finish(key):
	if key == Key.esc:
		listener.stop()
		os._exit(0)

def main():

	vc = None

	if platform.system() == 'Windows':
		vc = cv.VideoCapture(0,cv.CAP_DSHOW)

	elif platform.system() == 'Linux':
		vc = cv.VideoCapture(0)

	if vc.isOpened():
		rval, frame = vc.read()
	else:
		rval = False

	if rval:
		listener.start()

	while rval:
		rval, frame = vc.read()
		print(toASCII(frame))
		

	sys.exit()

def toASCII(frame, cols = 120, rows = 35):

	frame = cv.cvtColor(frame, cv.COLOR_BGR2GRAY)
	height, width = frame.shape
	cell_width = width / cols
	cell_height = height / rows
	if cols > width or rows > height:
		raise ValueError('Too many cols or rows.')
	result = ""
	for i in range(rows):
		for j in range(cols):
			gray = np.mean(
				frame[int(i * cell_height):min(int((i + 1) * cell_height), height), int(j * cell_width):min(int((j + 1) * cell_width), width)]
			)
			result += grayToChar(gray)
		result += '\n'
	return result

def grayToChar(gray):
  CHAR_LIST = ' .:-=+*#%@' # Replace by " .',;:clodxkO0KXNWM" if you want more precision.
	num_chars = len(CHAR_LIST)
	return CHAR_LIST[
		min(
			int(gray * num_chars / 255),
			num_chars - 1
		)
	]
	
if __name__ == '__main__':
		main()