Created
February 15, 2015 16:51
-
-
Save calston/b82e64de639367595084 to your computer and use it in GitHub Desktop.
3dhisto.py
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
import cv2 | |
import numpy as np | |
from matplotlib import pyplot as plt | |
from mpl_toolkits.mplot3d import Axes3D | |
from matplotlib import cm | |
from matplotlib.ticker import LinearLocator, FormatStrFormatter | |
def processStream(fname): | |
cap = cv2.VideoCapture(fname) | |
bright = [] | |
frames = 0 | |
while(cap.isOpened()): | |
ret, frame = cap.read() | |
if ret: | |
gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY) | |
r = cv2.calcHist([gray], [0], None, [256],[0,256]) | |
cv2.normalize(r, r, 0, 255, cv2.NORM_MINMAX) | |
frames += 1 | |
if frames > 50: | |
bright.append(np.ravel(r)) | |
frames = 0 | |
else: | |
break | |
cap.release() | |
y = np.arange(0, len(bright), 1) | |
x = np.arange(0, 256, 1) | |
x, y = np.meshgrid(x, y) | |
z = np.array(bright) | |
for rn, row in enumerate(z): | |
if (rn > 5) and (rn < len(z)-5): | |
for cn, col in enumerate(row): | |
if (cn > 5) and (cn < len(row)-5): | |
zf = [i[cn-5:cn+5] for i in z[rn-5:rn+5]] | |
z[rn][cn] = np.mean(zf) | |
else: | |
z[rn][cn] = 0 | |
else: | |
for cn, col in enumerate(row): | |
z[rn][cn] = 0 | |
fig = plt.figure() | |
ax = fig.gca(projection='3d') | |
surf = ax.plot_surface(x, y, z, rstride=10, cstride=10, cmap=cm.coolwarm, linewidth=0) | |
ax.set_ylim(0, len(bright)) | |
ax.set_xlim(0, 256) | |
ax.set_xlabel('Luminosity') | |
ax.set_zlabel('Frequency') | |
ax.set_ylabel('Time') | |
ax.zaxis.set_major_formatter(FormatStrFormatter('%d')) | |
fig.colorbar(surf, shrink=0.5, aspect=5) | |
plt.show() |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment