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Intensity -> Radial mapping for SWIM waveform generation from single LED SWMs
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{ | |
"cells": [ | |
{ | |
"cell_type": "code", | |
"execution_count": 1, | |
"id": "invisible-industry", | |
"metadata": {}, | |
"outputs": [], | |
"source": [ | |
"from PIL import Image, ImageFilter, ImageOps\n", | |
"import numpy as np" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 55, | |
"id": "veterinary-trademark", | |
"metadata": {}, | |
"outputs": [], | |
"source": [ | |
"A0 = Image.open('base.png')\n", | |
"A = np.array(ImageOps.grayscale(A0))" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 58, | |
"id": "marine-scottish", | |
"metadata": {}, | |
"outputs": [], | |
"source": [ | |
"import math\n", | |
"SCALE = 1.0\n", | |
"\n", | |
"# W = np.where(M > 50)\n", | |
"# Z0 = np.mean(W, axis=1)[:,np.newaxis]\n", | |
"# Vhat = np.array(W) - Z0\n", | |
"# Vhat /= np.linalg.norm(Vhat, axis=0)\n", | |
"\n", | |
"Aout = Image.new('RGB', A0.size, 'black')\n", | |
"Aout_pxs = Aout.load()\n", | |
"\n", | |
"X, Y = np.meshgrid(np.arange(A.shape[1]), np.arange(A.shape[0]))\n", | |
"Aflat = A.flatten()\n", | |
"XY = Z0 + (np.stack((X.flatten(), Y.flatten()), axis=0) - Z0) * (1 + Aflat / 256) * SCALE\n", | |
"for (x, y), a in zip(XY.T, Aflat):\n", | |
" try:\n", | |
" Aout_pxs[int(x), int(y)] = (0, Aout_pxs[int(x), int(y)][1] + int(math.sqrt(a / 256) * 256),0)\n", | |
" except IndexError:\n", | |
" pass" | |
] | |
}, | |
{ | |
"cell_type": "code", | |
"execution_count": 59, | |
"id": "proved-behavior", | |
"metadata": {}, | |
"outputs": [], | |
"source": [ | |
"Aout.save('swimsoft-current-mask.png')" | |
] | |
} | |
], | |
"metadata": { | |
"kernelspec": { | |
"display_name": "Python 3", | |
"language": "python", | |
"name": "python3" | |
}, | |
"language_info": { | |
"codemirror_mode": { | |
"name": "ipython", | |
"version": 3 | |
}, | |
"file_extension": ".py", | |
"mimetype": "text/x-python", | |
"name": "python", | |
"nbconvert_exporter": "python", | |
"pygments_lexer": "ipython3", | |
"version": "3.8.5" | |
} | |
}, | |
"nbformat": 4, | |
"nbformat_minor": 5 | |
} |
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#!/usr/bin/env python | |
from PIL import Image, ImageFilter, ImageOps | |
import numpy as np | |
import math | |
import scipy.sparse | |
import cv2 | |
import pdb | |
import sys | |
import pyvirtualcam | |
V = cv2.VideoCapture(0) | |
DOWNSCALE = 2 | |
H, W = int(V.get(cv2.CAP_PROP_FRAME_HEIGHT) / DOWNSCALE), int(V.get(cv2.CAP_PROP_FRAME_WIDTH) / DOWNSCALE) | |
with pyvirtualcam.Camera(width=W, height=H, fps=20, fmt=pyvirtualcam.PixelFormat.BGR) as Vout: | |
codec = cv2.VideoWriter_fourcc(*'MP4V') | |
SKIP = 4 | |
YX = np.mgrid[0:H,0:W] | |
C = (0, np.zeros((2,))) # weight, coord | |
ALPHA = 0.95 # exponential factor | |
SCALE = 1 | |
frame = 0 | |
frame_buf = np.zeros((H, W, 3, 2)) | |
while V.isOpened(): | |
frame += 1 | |
valid, im_raw = V.read() | |
if not valid: | |
break | |
# if frame % SKIP == 0: | |
# continue | |
im_raw = im_raw[(DOWNSCALE-1)::DOWNSCALE,(DOWNSCALE-1)::DOWNSCALE] | |
im = im_raw[:,:,0] # blue only | |
Etot = max(1, im.sum()) # max(1, im_thresh.sum()) | |
alpha_ = np.arctan(C[0] / Etot * math.tan(ALPHA * math.pi / 2)) / (math.pi / 2) | |
C = ( | |
alpha_ * C[0] + (1 - alpha_) * Etot, | |
alpha_ * C[1] + (1 - alpha_) * np.sum(im * YX, axis=(1,2)) / Etot | |
) | |
c_ = C[1][:,np.newaxis] | |
BLUR_SIZE = 5 | |
imflat = im.flatten().astype(np.uint32) # * (BLUR_SIZE ** 2) | |
xy_ = np.maximum((c_ + (YX.reshape((2,-1)) - c_) * (1 + imflat / 256) * SCALE).astype(np.int32), 0) | |
gray_raw = scipy.sparse.coo_matrix((imflat, xy_)).toarray() # np.sqrt(imflat) * (255 / np.sqrt(255)) | |
frame_out = np.zeros((H, W, 3)) | |
frame_out[:,:,0:2] = gray_raw[:H, :W, np.newaxis] # np.tile( # duplicates are summed together | |
# Image.fromarray(frame_out).show() | |
# sys.stdout.write('\r%d' % frame) | |
frame_buf[:,:,:,frame%(frame_buf.shape[3])] = frame_out | |
frame_out_b = np.minimum(255, frame_buf.sum(axis=3)).astype(np.uint8) | |
frame_comp = cv2.add(cv2.boxFilter(frame_out_b, -1, (3,3), normalize=False), im_raw) | |
cv2.circle(frame_comp, C[1][::-1].astype(np.uint32), 3, (0, 0, 255), -1) | |
Vout.send(frame_comp) | |
sys.stdout.write('\r%d' % frame) | |
V.release() | |
cv2.destroyAllWindows() |
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