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app.py
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app.py
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#!/usr/bin/env python
# Alex Eidt
import tkinter as tk
import string
import imageio
import numpy as np
import numexpr as ne
import keyboard
from PIL import Image, ImageTk, ImageFont, ImageDraw
# Mirror image stream along vertical axis.
MIRROR = True
# Video Stream to use.
STREAM = "<video0>"
# Background color of the ASCII stream.
BACKGROUND_COLOR = "white"
# Font color used in the ASCII stream. Make sure there's some contrast between the two.
FONT_COLOR = "black"
# Font size to use with colored/grayscaled ASCII.
FONTSIZE = 12
# Boldness to use with colored/grayscaled ASCII.
BOLDNESS = 1
# Factor to divide image height and width by. 1 For for original size, 2 for half size, etc...
FACTOR = 1
# Characters to use in ASCII.
CHARS = "@%#*+=-:. "
# Font to use in ASCII Graphics.
FONT = "cour.ttf"
ASCII = 0
FILTER = 0
BLOCKS = 0
TEXT = 0
MONO = 0
MIRROR = 1
def get_font_maps(fontsize, boldness, chars):
"""
Returns a list of font bitmaps.
Parameters
fontsize - Font size to use for ASCII characters
boldness - Stroke size to use when drawing ASCII characters
chars - ASCII characters to use in media
Returns
List of font bitmaps corresponding to the order of characters in CHARS
"""
fonts = []
widths, heights = set(), set()
font = ImageFont.truetype(FONT, size=fontsize)
for char in chars:
w, h = font.getsize(char)
widths.add(w)
heights.add(h)
image = Image.new("RGB", (w, h), (255, 255, 255))
draw = ImageDraw.Draw(image)
draw.text(
(0, -(fontsize // 6)),
char,
fill=(0, 0, 0),
font=font,
stroke_width=boldness,
)
bitmap = np.array(image, dtype=np.uint8)
fonts.append(255 - bitmap)
fonts = list(map(lambda x: x[: min(heights), : min(widths)], fonts))
return np.array(sorted(fonts, key=lambda x: x.sum(), reverse=True))
def update():
"""
Update settings based on user input.
"""
global ASCII, FILTER, BLOCKS, TEXT, MONO
if keyboard.is_pressed("shift+a"): # ASCII Mode.
ASCII = 0
elif keyboard.is_pressed("a"):
ASCII = 1
if keyboard.is_pressed("shift+t"): # Text Mode.
TEXT = 0
elif keyboard.is_pressed("t"):
TEXT = 1
if keyboard.is_pressed("shift+m"): # Monochromatic Mode.
MONO = 0
elif keyboard.is_pressed("m"):
MONO = 1
if keyboard.is_pressed("o"): # Outline Filter.
FILTER = 1
elif keyboard.is_pressed("s"): # Sobel Filter.
FILTER = 2
elif keyboard.is_pressed("space"): # No Filter.
FILTER = 0
for i in range(10):
if keyboard.is_pressed(str(i)):
BLOCKS = i
break
def tile_tuples(w, h):
"""
Return tile sizes for resizing ASCII Images.
"""
result = lambda x: [i for i in range(2, x) if x % i == 0]
return list(zip(result(w), result(h)))
def convolve(frame, kernel):
"""
Peform a 2D image convolution on the given frame with the given kernel.
"""
height, width = frame.shape
kernel_height, kernel_width = kernel.shape
# assert kh == kw
output = np.pad(frame, kernel_height // 2, mode="edge")
output_shape = kernel.shape + tuple(np.subtract(output.shape, kernel.shape) + 1)
strides = output.strides + output.strides
return np.einsum(
"ij,ijkl->kl",
kernel,
np.lib.stride_tricks.as_strided(output, output_shape, strides),
)
def main():
# All ASCII characters used in the images sorted by pixel density.
chars = np.array([c for c in string.printable if c in CHARS])
font_maps = [get_font_maps(FONTSIZE, BOLDNESS, chars)]
for fontsize in [5, 10, 15, 20, 30, 45, 60, 85, 100]:
font_maps.append(get_font_maps(fontsize, BOLDNESS, chars))
# Set up window.
root = tk.Tk()
root.title("ASCII Streamer")
mainframe = tk.Frame()
image_label = tk.Label(mainframe, borderwidth=5, relief="solid")
ascii_label = tk.Label(
mainframe,
font=("courier", 2),
fg=FONT_COLOR,
bg=BACKGROUND_COLOR,
borderwidth=5,
relief="solid",
)
mainframe.pack(side=tk.LEFT, expand=tk.YES, padx=10)
root.protocol("WM_DELETE_WINDOW", lambda: (video.close(), root.destroy()))
# Get image stream from webcam or other source and begin streaming.
video = imageio.get_reader(STREAM)
w, h = video.get_meta_data()["source_size"]
tiles = tile_tuples(w, h)
def stream():
image = video.get_next_data()
# Update settings based on pressed keys.
update()
h, w, c = image.shape
# Text image is larger than regular, so multiply scaling factor by 2 if Text mode is on.
size = FACTOR * 2 if TEXT else FACTOR
h //= size
w //= size
# Resize Image.
image = image[::size, ::size]
if TEXT: # Grayscale Image.
image = (image * np.array([0.299, 0.587, 0.114])).sum(
axis=2, dtype=np.uint8
)
if MIRROR: # Mirror Image along vertical axis.
image = image[:, ::-1]
# Tile Image into dw x dh blocks for resized ASCII streams.
if BLOCKS > 0 and TEXT:
dw, dh = tiles[min(BLOCKS, len(tiles) - 1)]
image = (
np.add.reduceat(
np.add.reduceat(image.astype(np.uint32), np.arange(0, h, dh), axis=0),
np.arange(0, w, dw),
axis=1,
)
/ (dw * dh)
).astype(np.uint8)
h, w = image.shape
# Apply image convolutions to stream.
if FILTER > 0 and TEXT:
if FILTER == 1: # Outline Kernel.
image = convolve(
image, np.array([[-1, -1, -1], [-1, -8, -1], [-1, -1, -1]])
).astype(np.uint8)
elif FILTER == 2: # Sobel Kernel.
gx = np.array([[1, 0, -1], [2, 0, -2], [1, 0, -1]])
gy = np.array([[1, 2, 1], [0, 0, 0], [-1, -2, -1]])
image = np.hypot(convolve(image, gx), convolve(image, gy)).astype(
np.uint8
)
if ASCII and not TEXT:
fh, fw = font_maps[BLOCKS][0].shape[:2]
frame = image[::fh, ::fw]
nh, nw = frame.shape[:2]
if not MONO:
colors = (255 - frame).repeat(fw, 1).repeat(fh, 0)
grayscaled = (
(frame * np.array([3, 4, 1])).sum(axis=2, dtype=np.uint32).ravel()
)
grayscaled *= len(chars)
grayscaled >>= 11
# Create a new list with each font bitmap based on the grayscale value
image = (
font_maps[BLOCKS][grayscaled]
.reshape((nh, nw, fh, fw, 3))
.transpose(0, 2, 1, 3, 4)
.ravel()
.reshape((nh * fh, nw * fw, 3))
)
if MONO:
ne.evaluate("255 - image", out=image, casting="unsafe")
image = image.astype(np.uint8)
else:
image = image[:h, :w]
colors = colors[:h, :w].astype(np.uint16)
image = (255 - (image * colors) // 255).astype(np.uint8)
# If ASCII mode is on convert frame to ascii and display, otherwise display video stream.
if TEXT:
image = image[[i for i in range(h) if i % 4]]
image = image.astype(np.uint32)
image *= len(chars)
image >>= 8
image_label.pack_forget()
ascii_label.pack()
# Update label with new ASCII image.
ascii_label.config(
text="\n".join("".join(x) for x in chars[image]),
font=("courier", (BLOCKS * 4) + 2),
)
ascii_label.after(1, stream)
else:
ascii_label.pack_forget()
image_label.pack()
frame_image = ImageTk.PhotoImage(Image.fromarray(image))
image_label.config(image=frame_image)
image_label.image = frame_image
image_label.after(1, stream)
stream()
root.state("zoomed")
root.mainloop()
if __name__ == "__main__":
main()