Tuesday, January 1, 2019

Detect nudity with nudepy python module.

Today I tested another python module named nudepy.
You can find it here.
This python module is a port of nude.js to Python.
Let's start the tutorial with the installation:
C:\Python364\Scripts>cd ..

C:\Python364>cd Scripts

C:\Python364\Scripts>pip install nudepy
Requirement already satisfied: nudepy in c:\python364\lib\site-packages (0.4)
Requirement already satisfied: pillow in c:\python364\lib\site-packages (from nu
depy) (5.3.0)
To test this python module, I used four images with the idea of a nude image
This image is the result of all images of the test.

This image files are named:
  • test_nude_001.jpg
  • test_nude_002.jpg
  • test_nude_003.jpg
  • test_nude_004.jpg
Let's see the script:
# for select jpeg files
import os, fnmatch
# import nude python module
import nude
from nude import Nude
nude_jpegs=fnmatch.filter(os.listdir('.'), '*nude*.jpg')
for found_file in nude_jpegs:
    print (found_file)
    print("Nude file: ",nude.is_nude(str(found_file)))
    n = Nude(str(found_file))
    print("and test result: ", n.result, n.inspect())
The result of the output script is this:
C:\Python364>python.exe test_nude.py
['test_nude_001.jpg', 'test_nude_002.jpg', 'test_nude_003.jpg', 'test_nude_004.j
Nude file:  False
and test result:  False #
Nude file:  False
and test result:  False #
Nude file:  False
and test result:  False #
Nude file:  True
and test result:  True #

Thursday, December 27, 2018

Using LibROSA python module.

This python module named LibROSA is a python package for music and audio analysis and provides the building blocks necessary to create music information retrieval systems.
C:\Python364>cd Scripts
C:\Python364\Scripts>pip install librosa
Collecting librosa
Successfully installed audioread-2.1.6 joblib-0.13.0 librosa-0.6.2 llvmlite-0.26.0 numba-0.41.0 resampy-0.2.1 
Let's create one waveform and a spectrogram with this python module.
The waveform (for sound) the term describes a depiction of the pattern of sound pressure variation (or amplitude) in the time domain.
A spectrogram (known also like sonographs, voiceprints, or voicegrams) is a visual representation of the spectrum of frequencies of sound or other signals as they vary with time.
I used a free WAV file sound from here.
The result of the waveform and spectrogram for that audio file is shown into next screenshots:

My example show first the waveform and you need to close the it to see the spectrogram.
Let's see the source code of this example:
import librosa
import librosa.display
import matplotlib.pyplot as plt
plt.figure(figsize=(14, 5))
path = "merry_christmas.wav"
out,samples = librosa.load(path)
print(out.shape, samples)
librosa.display.waveplot(out, sr=samples)
stft_array = librosa.stft(out)
stft_array_db = librosa.amplitude_to_db(abs(stft_array))
librosa.display.specshow(stft_array_db,sr=samples,x_axis='time', y_axis='hz')