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improved cut detection

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This commit is contained in:
rolux 2012-03-06 20:59:44 +01:00
parent 0f482ac8c4
commit afa51f7971
1 changed files with 16 additions and 12 deletions
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28
pandora/archive/extract.py
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@ -329,17 +329,21 @@ def average_color(prefix, start=0, end=0):
color = list(map(float, color))
return ox.image.getHSL(color)
def average_volume(prefix, start=0, end=0):
#FIXME: actually compute volume
return 0
def get_distance(rgb0, rgb1):
# rgb distance, normalized so that black/white equals 1
dst = math.sqrt(pow(rgb0[0] - rgb1[0], 2) + pow(rgb0[1] - rgb1[1], 2) + pow(rgb0[2] - rgb1[2], 2))
return dst / math.sqrt(3 * pow(255, 2))
def cuts(prefix):
cuts = []
distances = [0]
fps = 25
frames = 0
height = 64
@ -350,19 +354,19 @@ def cuts(prefix):
timeline = Image.open(image)
frames += timeline.size[0]
pixels.append(timeline.load())
for frame in range(0, frames):
for frame in range(1, frames):
x = frame % width
if frame > 0:
dst = 0
image0 = int((frame - 1) / width)
image1 = int(frame / width)
for y in range(0, height):
rgb0 = pixels[image0][(x - 1) % width, y]
rgb1 = pixels[image1][x, y]
dst += get_distance(rgb0, rgb1) / height
#print frame / fps, dst
if dst > 0.1:
cuts.append(frame / fps)
distance = 0
image0 = int((frame - 1) / width)
image1 = int(frame / width)
for y in range(height):
rgb0 = pixels[image0][(x - 1) % width, y]
rgb1 = pixels[image1][x, y]
distance += get_distance(rgb0, rgb1)
distances.append(distance / height)
for frame in range(1, frames):
if distances[frame] >= 0.025 and abs(distances[frame] - distances[frame - 1]) >= 0.05:
cuts.append(frame / fps)
return cuts