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achabotl/CountingPixels.ipynb

Last active August 29, 2015 14:06
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CountingPixels.ipynb
{
"metadata": {
"name": "",
"signature": "sha256:ab5b0f97916b85ea193d953e6c593b6fd2b30e9de172c905cd1af1eec9558bd0"
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "code",
"collapsed": false,
"input": [
"from __future__ import division\n",
"import numpy as np\n",
"from matplotlib import pyplot as plt"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 1
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Create the image."
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"n_white, n_gray, n_black = 20, 50, 30\n",
"in_white = np.zeros(n_white).reshape((n_white / 10, 10))\n",
"in_gray = 125 * np.ones(n_gray).reshape((n_gray / 10, 10))\n",
"in_black = 255 * np.ones(n_black).reshape((n_black / 10, 10))\n",
"img = np.vstack([in_white, in_gray, in_black])\n",
"plt.imshow(img, cmap='bone', interpolation='nearest')\n",
"plt.colorbar()"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 2,
"text": [
"<matplotlib.colorbar.Colorbar instance at 0x10df31200>"
]
},
{
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"' width=296 height=251/>"
],
"metadata": {},
"output_type": "display_data",
"text": [
"<matplotlib.figure.Figure at 0x10a4d8dd0>"
]
}
],
"prompt_number": 2
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"Calculate how many pixels are in the white, gray, and black ranges."
]
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"lower = 255 / 3\n",
"upper = 2 * lower\n",
"black = np.sum(img >= upper)\n",
"gray = np.sum(np.logical_and(lower <= img, img < upper))\n",
"white = np.sum(img < lower)"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 3
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"all = img.size\n",
"print \"Total pixels: %d\" % all\n",
"print \"White pixels: %d (%5.2f%%)\" % (white, 100.0*white/all)\n",
"print \"Black pixels: %d (%5.2f%%)\" % (black, 100.0*black/all)\n",
"print \"Gray pixels: %d (%5.2f%%)\" % (gray, 100.0*gray/all)"
],
"language": "python",
"metadata": {},
"outputs": [
{
"output_type": "stream",
"stream": "stdout",
"text": [
"Total pixels: 100\n",
"White pixels: 20 (20.00%)\n",
"Black pixels: 30 (30.00%)\n",
"Gray pixels: 50 (50.00%)\n"
]
}
],
"prompt_number": 4
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"assert(n_white == white)\n",
"assert(n_gray == gray)\n",
"assert(n_black == black)"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 5
}
],
"metadata": {}
}
]
}
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