Re-reimplement histogram stretching, matching, and equalization and hist/pdf/cdf

  1. Require ip.image

2) Build image histogram, PDF, and CDF blocks 2) Build LUT application block 4) Build a contrast enhancement block 5) Display comparison of original vs equalized

  • We should definitely have a more robust block for doing these with pooling too

NOTE: AMONG US ($5 on steam)

First let’s import our basic libraries

import numpy as np
import matplotlib.pyplot as plt
import imagepypelines as ip
ip.require('image')

We’ll also need to set up a few blocks

# A block for computing the histogram, pdf, and cdf of an image
@ip.blockify()
def compute_stats(image, bit_depth=8):
    hist, bins = np.histogram(image, bins=np.linspace(0, (2**bit_depth)+1, (2**bit_depth)+1))
    pdf = hist / image.size
    cdf = np.cumsum(pdf)
    return hist, pdf, cdf

# A quick block for building a histogram equalization look-up table (LUT)
@ip.blockify()
def equalization_LUT(image_cdf, bit_depth=8):
    target_cdf = np.cumsum(np.ones(2**bit_depth) / 2**bit_depth)
    lut = np.searchsorted(target_cdf, image_cdf)
    return lut

# A quick block for applying a LUT to an image
@ip.blockify()
def apply_LUT(image, lut):
    return lut[image].astype(image.dtype)

# A quick block for plotting original versus stretched histograms
@ip.blockify(batch_type="each", void=True)
def compare_stats(original, equalized):
    fig = plt.figure()
    plt.plot(np.linspace(0,len(original)-1,len(original)), original, color='r')
    plt.plot(np.linspace(0,len(equalized)-1,len(equalized)), equalized, color='b')
    plt.ion()
    plt.show()

# stats = compute_stats(ip.image.giza())
# eq_stats = compute_stats(apply_LUT(ip.image.giza(), equalization_LUT(stats[2])))
# compare_stats(stats[0], eq_stats[0])

tasks = {
        # set an entry point for images into the pipeline
        'images': ip.Input(),
        # compute image stats
        ('hists', 'pdfs', 'cdfs'): (compute_stats, 'images'),
        # construct equalization LUT
        'LUTs': (equalization_LUT, 'cdfs'),
        # apply LUT
        'applied': (apply_LUT, 'images', 'LUTs'),
        # Scale the images, cast dtype, and view the stretched images
        # in sequence!
        'safe': (ip.image.DisplaySafe(), 'applied'),
        'viewing' : (ip.image.CompareView(pause_for=1000), 'images','safe'),
        # show graph of hist (red) and eq_hist (blue),
        ('eq_hists', 'eq_pdfs', 'eq_cdfs'): (compute_stats, 'applied'),
        'plotted': (compare_stats, 'hists', 'eq_hists')
        }

# Pipeline setup
contrast = ip.Pipeline(tasks)

# Let's grab some example data from the ImagePypelines standard set
images = [ip.image.giza(), ip.image.crowd()]

# And let's see some results!
contrast(images)
  • contrast enhancement
  • contrast enhancement
  • Image1, Image2

Out:

{'images': [array([[ 76,  90,  97, ...,  81,  82,  78],
       [ 86,  98, 102, ...,  83,  80,  78],
       [ 92, 100, 102, ...,  83,  81,  84],
       ...,
       [142, 143, 140, ...,  77,  73,  73],
       [138, 141, 140, ...,  74,  72,  72],
       [133, 138, 138, ...,  73,  73,  74]], dtype=uint8), array([[ 49,  52,  64, ..., 234, 233, 234],
       [ 48,  48,  56, ..., 212, 211, 211],
       [ 51,  48,  50, ..., 196, 197, 197],
       ...,
       [149, 120,  71, ..., 152, 154, 153],
       [143, 118,  72, ..., 154, 157, 154],
       [144, 118,  72, ..., 154, 157, 153]], dtype=uint8)], 'cdfs': (array([0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       7.62939453e-06, 6.86645508e-05, 3.28063965e-04, 9.95635986e-04,
       2.88391113e-03, 6.70242310e-03, 1.31950378e-02, 2.27241516e-02,
       3.50990295e-02, 5.02586365e-02, 6.70547485e-02, 8.38317871e-02,
       1.01882935e-01, 1.18560791e-01, 1.35112762e-01, 1.51741028e-01,
       1.68613434e-01, 1.85802460e-01, 2.04189301e-01, 2.22629547e-01,
       2.41489410e-01, 2.59677887e-01, 2.77946472e-01, 2.95696259e-01,
       3.12442780e-01, 3.28109741e-01, 3.42876434e-01, 3.56536865e-01,
       3.68343353e-01, 3.78852844e-01, 3.88496399e-01, 3.96915436e-01,
       4.04430389e-01, 4.11140442e-01, 4.17003632e-01, 4.22477722e-01,
       4.27440643e-01, 4.31854248e-01, 4.36115265e-01, 4.40158844e-01,
       4.44313049e-01, 4.48329926e-01, 4.52354431e-01, 4.56317902e-01,
       4.60422516e-01, 4.64336395e-01, 4.68463898e-01, 4.72484589e-01,
       4.76715088e-01, 4.81613159e-01, 4.86938477e-01, 4.92656708e-01,
       4.99130249e-01, 5.06156921e-01, 5.13847351e-01, 5.22331238e-01,
       5.32051086e-01, 5.42472839e-01, 5.54096222e-01, 5.66715240e-01,
       5.80497742e-01, 5.96710205e-01, 6.15402222e-01, 6.37104034e-01,
       6.62498474e-01, 6.92798615e-01, 7.27767944e-01, 7.66807556e-01,
       8.07514191e-01, 8.45321655e-01, 8.78894806e-01, 9.06185150e-01,
       9.27043915e-01, 9.43737030e-01, 9.56184387e-01, 9.65587616e-01,
       9.72805023e-01, 9.78549957e-01, 9.83215332e-01, 9.86648560e-01,
       9.89307404e-01, 9.91191864e-01, 9.92607117e-01, 9.93938446e-01,
       9.94934082e-01, 9.95746613e-01, 9.96395111e-01, 9.96906281e-01,
       9.97459412e-01, 9.97867584e-01, 9.98218536e-01, 9.98508453e-01,
       9.98771667e-01, 9.99023438e-01, 9.99248505e-01, 9.99439240e-01,
       9.99599457e-01, 9.99702454e-01, 9.99786377e-01, 9.99835968e-01,
       9.99885559e-01, 9.99919891e-01, 9.99931335e-01, 9.99931335e-01,
       9.99938965e-01, 9.99946594e-01, 9.99961853e-01, 9.99973297e-01,
       9.99973297e-01, 9.99973297e-01, 9.99973297e-01, 9.99977112e-01,
       9.99977112e-01, 9.99977112e-01, 9.99977112e-01, 9.99980927e-01,
       9.99980927e-01, 9.99980927e-01, 9.99980927e-01, 9.99980927e-01,
       9.99980927e-01, 9.99980927e-01, 9.99980927e-01, 9.99984741e-01,
       9.99984741e-01, 9.99984741e-01, 9.99984741e-01, 9.99984741e-01,
       9.99984741e-01, 9.99984741e-01, 9.99984741e-01, 9.99984741e-01,
       9.99984741e-01, 9.99984741e-01, 9.99988556e-01, 9.99992371e-01,
       9.99992371e-01, 9.99992371e-01, 9.99996185e-01, 9.99996185e-01,
       9.99996185e-01, 1.00000000e+00, 1.00000000e+00, 1.00000000e+00,
       1.00000000e+00, 1.00000000e+00, 1.00000000e+00, 1.00000000e+00,
       1.00000000e+00, 1.00000000e+00, 1.00000000e+00, 1.00000000e+00,
       1.00000000e+00, 1.00000000e+00, 1.00000000e+00, 1.00000000e+00,
       1.00000000e+00, 1.00000000e+00, 1.00000000e+00, 1.00000000e+00,
       1.00000000e+00, 1.00000000e+00, 1.00000000e+00, 1.00000000e+00,
       1.00000000e+00, 1.00000000e+00, 1.00000000e+00, 1.00000000e+00,
       1.00000000e+00, 1.00000000e+00, 1.00000000e+00, 1.00000000e+00,
       1.00000000e+00, 1.00000000e+00, 1.00000000e+00, 1.00000000e+00,
       1.00000000e+00, 1.00000000e+00, 1.00000000e+00, 1.00000000e+00,
       1.00000000e+00, 1.00000000e+00, 1.00000000e+00, 1.00000000e+00,
       1.00000000e+00, 1.00000000e+00, 1.00000000e+00, 1.00000000e+00,
       1.00000000e+00, 1.00000000e+00, 1.00000000e+00, 1.00000000e+00]), array([7.62939453e-06, 8.39233398e-05, 1.03378296e-03, 2.67410278e-03,
       4.61578369e-03, 7.00759888e-03, 9.60922241e-03, 1.24397278e-02,
       1.50718689e-02, 1.80282593e-02, 2.10151672e-02, 2.39524841e-02,
       2.69165039e-02, 2.99491882e-02, 3.32183838e-02, 3.65600586e-02,
       3.97529602e-02, 4.31251526e-02, 4.66308594e-02, 5.04226685e-02,
       5.43594360e-02, 5.85479736e-02, 6.30035400e-02, 6.75048828e-02,
       7.19146729e-02, 7.66105652e-02, 8.15925598e-02, 8.65325928e-02,
       9.18769836e-02, 9.74845886e-02, 1.02962494e-01, 1.08413696e-01,
       1.13697052e-01, 1.19312286e-01, 1.25141144e-01, 1.31374359e-01,
       1.37290955e-01, 1.43421173e-01, 1.49600983e-01, 1.55830383e-01,
       1.61674500e-01, 1.67537689e-01, 1.73069000e-01, 1.78520203e-01,
       1.83628082e-01, 1.88991547e-01, 1.94293976e-01, 1.99447632e-01,
       2.04448700e-01, 2.09705353e-01, 2.14908600e-01, 2.20146179e-01,
       2.25357056e-01, 2.30354309e-01, 2.35176086e-01, 2.40211487e-01,
       2.45288849e-01, 2.50213623e-01, 2.55119324e-01, 2.59830475e-01,
       2.64533997e-01, 2.69027710e-01, 2.73799896e-01, 2.78499603e-01,
       2.82978058e-01, 2.87452698e-01, 2.91816711e-01, 2.96138763e-01,
       3.00457001e-01, 3.04851532e-01, 3.09162140e-01, 3.13804626e-01,
       3.18244934e-01, 3.22834015e-01, 3.27445984e-01, 3.32115173e-01,
       3.36814880e-01, 3.41518402e-01, 3.45981598e-01, 3.50891113e-01,
       3.55419159e-01, 3.60439301e-01, 3.65108490e-01, 3.69720459e-01,
       3.74500275e-01, 3.79146576e-01, 3.83934021e-01, 3.88790131e-01,
       3.93707275e-01, 3.98452759e-01, 4.03385162e-01, 4.08435822e-01,
       4.13372040e-01, 4.18487549e-01, 4.23728943e-01, 4.29134369e-01,
       4.34516907e-01, 4.39846039e-01, 4.45327759e-01, 4.50630188e-01,
       4.56283569e-01, 4.61894989e-01, 4.67720032e-01, 4.73541260e-01,
       4.79209900e-01, 4.84771729e-01, 4.90215302e-01, 4.95658875e-01,
       5.01296997e-01, 5.06576538e-01, 5.12187958e-01, 5.17704010e-01,
       5.23181915e-01, 5.28984070e-01, 5.34725189e-01, 5.40309906e-01,
       5.45974731e-01, 5.51845551e-01, 5.57659149e-01, 5.63644409e-01,
       5.69438934e-01, 5.74951172e-01, 5.80570221e-01, 5.86166382e-01,
       5.91663361e-01, 5.97057343e-01, 6.02508545e-01, 6.07891083e-01,
       6.13452911e-01, 6.18892670e-01, 6.24244690e-01, 6.29512787e-01,
       6.35009766e-01, 6.40167236e-01, 6.45484924e-01, 6.50600433e-01,
       6.55735016e-01, 6.61018372e-01, 6.66290283e-01, 6.71585083e-01,
       6.76479340e-01, 6.81430817e-01, 6.86439514e-01, 6.91158295e-01,
       6.95728302e-01, 7.00473785e-01, 7.05165863e-01, 7.09632874e-01,
       7.14134216e-01, 7.18700409e-01, 7.23316193e-01, 7.27523804e-01,
       7.31857300e-01, 7.36133575e-01, 7.40341187e-01, 7.44670868e-01,
       7.48676300e-01, 7.52754211e-01, 7.56847382e-01, 7.60993958e-01,
       7.64934540e-01, 7.69084930e-01, 7.72937775e-01, 7.76760101e-01,
       7.80868530e-01, 7.84839630e-01, 7.88707733e-01, 7.92732239e-01,
       7.96501160e-01, 8.00315857e-01, 8.03997040e-01, 8.07796478e-01,
       8.11660767e-01, 8.15299988e-01, 8.19087982e-01, 8.22780609e-01,
       8.26225281e-01, 8.29616547e-01, 8.33129883e-01, 8.36563110e-01,
       8.39885712e-01, 8.43029022e-01, 8.46160889e-01, 8.49205017e-01,
       8.52466583e-01, 8.55579376e-01, 8.58505249e-01, 8.61431122e-01,
       8.64280701e-01, 8.67221832e-01, 8.70010376e-01, 8.72829437e-01,
       8.75701904e-01, 8.78341675e-01, 8.80954742e-01, 8.83548737e-01,
       8.86196136e-01, 8.88614655e-01, 8.91227722e-01, 8.93577576e-01,
       8.96156311e-01, 8.98548126e-01, 9.00920868e-01, 9.03255463e-01,
       9.05494690e-01, 9.07707214e-01, 9.09881592e-01, 9.11914825e-01,
       9.13944244e-01, 9.15920258e-01, 9.17808533e-01, 9.19857025e-01,
       9.21806335e-01, 9.23728943e-01, 9.25621033e-01, 9.27555084e-01,
       9.29374695e-01, 9.31293488e-01, 9.33284760e-01, 9.34936523e-01,
       9.36653137e-01, 9.38137054e-01, 9.39758301e-01, 9.41333771e-01,
       9.42909241e-01, 9.44480896e-01, 9.45858002e-01, 9.47338104e-01,
       9.48726654e-01, 9.50237274e-01, 9.51595306e-01, 9.53174591e-01,
       9.54685211e-01, 9.56439972e-01, 9.58282471e-01, 9.60494995e-01,
       9.62604523e-01, 9.64817047e-01, 9.66823578e-01, 9.69005585e-01,
       9.71267700e-01, 9.73800659e-01, 9.76142883e-01, 9.78157043e-01,
       9.80022430e-01, 9.81769562e-01, 9.83493805e-01, 9.85118866e-01,
       9.86644745e-01, 9.87827301e-01, 9.89238739e-01, 9.90184784e-01,
       9.91092682e-01, 9.92122650e-01, 1.00000000e+00, 1.00000000e+00])), 'hists': (array([    0,     0,     0,     0,     0,     0,     0,     0,     0,
           0,     0,     0,     0,     0,     0,     0,     0,     0,
           0,     0,     0,     0,     0,     0,     0,     0,     0,
           0,     0,     0,     0,     0,     0,     0,     0,     0,
           0,     0,     0,     0,     0,     0,     0,     0,     0,
           0,     0,     0,     0,     0,     0,     0,     0,     0,
           0,     0,     0,     0,     0,     0,     0,     0,     0,
           0,     2,    16,    68,   175,   495,  1001,  1702,  2498,
        3244,  3974,  4403,  4398,  4732,  4372,  4339,  4359,  4423,
        4506,  4820,  4834,  4944,  4768,  4789,  4653,  4390,  4107,
        3871,  3581,  3095,  2755,  2528,  2207,  1970,  1759,  1537,
        1435,  1301,  1157,  1117,  1060,  1089,  1053,  1055,  1039,
        1076,  1026,  1082,  1054,  1109,  1284,  1396,  1499,  1697,
        1842,  2016,  2224,  2548,  2732,  3047,  3308,  3613,  4250,
        4900,  5689,  6657,  7943,  9167, 10234, 10671,  9911,  8801,
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        270, 2065,    0])), 'pdfs': (array([0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
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       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
       0.00000000e+00, 0.00000000e+00, 0.00000000e+00, 0.00000000e+00,
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Total running time of the script: ( 0 minutes 2.596 seconds)

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