def test_compress_video():
# Test series of video compressions and plot results
data = load_cuprite()
original_size = data.dtype.itemsize * data.size
rel_errors = []
compression_factors = []
for quality in range(0, 55, 5):
print(quality)
start = time()
compressed = other_compression.compress_video(data,
crf=quality,
preset="ultrafast")
print("Time elapsed:", time() - start)
decompressed = other_compression.decompress_video(compressed)
rel_errors.append(
np.linalg.norm(data - decompressed) / np.linalg.norm(data))
compression_factors.append(
original_size /
other_compression.get_compress_video_size(compressed))
print(rel_errors[-1])
print(compression_factors[-1])
print("rel_errors =", rel_errors)
print("compression_factors =", compression_factors)
plt.plot(rel_errors, compression_factors, "bo")
plt.plot(rel_errors, compression_factors, "b")
plt.show()
def make_video_mauna_kea():
data = load_mauna_kea()
quality = 0
compressed = other_compression.compress_video(data, quality)
with open("../data/mauna_kea.mkv", "wb") as f:
f.write(compressed[0])
print(rel_error(other_compression.decompress_video(compressed), data))
def compare_times():
data = load_cuprite()
original_size = data.dtype.itemsize * data.size
st_hosvd.print_compression_rate_tucker(
data, st_hosvd.compress_tucker(data, 0.025))
start = time()
compressed = st_hosvd.compress_quantize2(
st_hosvd.compress_tucker(data, 0.025))
print("Time for compression:", time() - start)
start = time()
decompressed = st_hosvd.decompress_tucker(
st_hosvd.decompress_quantize2(compressed))
print("Time for decompression:", time() - start)
st_hosvd.print_compression_rate_quantize2(data, compressed)
print_difference(data, decompressed)
start = time()
compressed = other_compression.compress_jpeg(data, 50)
print("Time for compression:", time() - start)
start = time()
decompressed = other_compression.decompress_jpeg(compressed)
print("Time for decompression:", time() - start)
print("Compressed size:",
other_compression.get_compress_jpeg_size(compressed))
print("Compression ratio:",
other_compression.get_compress_jpeg_size(compressed) / original_size)
print_difference(data, decompressed)
start = time()
compressed = other_compression.compress_video(data, 28)
print("Time for compression:", time() - start)
start = time()
decompressed = other_compression.decompress_video(compressed)
print("Time for decompression:", time() - start)
print("Compressed size:",
other_compression.get_compress_video_size(compressed))
print(
"Compression ratio:",
other_compression.get_compress_video_size(compressed) / original_size)
print_difference(data, decompressed)