{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Traitement d'images\n",
    "\n",
    "Avant de commencer : \n",
    "\n",
    "* le fichier voirP1P2P3.py doit être présent dans le même dossier que ce notebook.    \n",
    "\n",
    "* le fichier image_degrade aussi"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "from voirP1P2P3 import *  #programme qui permet de voir les images"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Nous avons déjà rencontré les images pbm, pgm, ppm.\n",
    "\n",
    "Nous allons manipuler ces images en les mettant sous forme de listes.\n",
    "\n",
    "## Images noir et blanc"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "L'image sntNoirEtBlanc.pbm a été créée avec Notepad++ : \n",
    "\n",
    "P1<br/>\n",
    "18 9<br/>\n",
    "0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0<br/>\n",
    "0 1 1 1 1 0 1 0 0 0 1 0 1 1 1 1 1 0<br/>\n",
    "0 1 0 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0<br/>\n",
    "0 1 0 0 0 0 1 1 0 0 1 0 0 0 1 0 0 0<br/>\n",
    "0 1 1 1 1 0 1 0 1 0 1 0 0 0 1 0 0 0<br/>\n",
    "0 0 0 0 1 0 1 0 0 1 1 0 0 0 1 0 0 0<br/>\n",
    "0 0 0 0 1 0 1 0 0 0 1 0 0 0 1 0 0 0<br/>\n",
    "0 1 1 1 1 0 1 0 0 0 1 0 0 0 1 0 0 0<br/>\n",
    "0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0<br/>\n",
    "\n",
    "Rappel : 18 car l'image comporte 18 colonnes ; 9 car elle comporte 9 lignes. \n",
    "\n",
    "$18 \\times 9 = 162$ donc c'est une image de 162 pixels."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "image = ['P1',18,9,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,1,0,0,0,1,0,1,1,1,1,1,0,0,1,0,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,0,1,0,0,0,0,1,1,0,0,1,0,0,0,1,0,0,0,0,1,1,1,1,0,1,0,1,0,1,0,0,0,1,0,0,0,0,0,0,0,1,0,1,0,0,1,1,0,0,0,1,0,0,0,0,0,0,0,1,0,1,0,0,0,1,0,0,0,1,0,0,0,0,1,1,1,1,0,1,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]\n",
    "\n",
    "largeur = image[1]\n",
    "hauteur = image[2]\n",
    "\n",
    "voir_image(image)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Pour passer la suite, fermer la fenêtre de visualisation.\n",
    "\n",
    "Que valent largeur et hauteur ?\n",
    "\n",
    "Faire afficher dans la fenêtre ci-dessous le nombre de pixels :"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "print(...)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "La variable image est de type liste. On peut obtenir sa longueur :"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "len(image)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Ce résultat semble-t-il cohérent ?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Image en niveaux de gris"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "image_gris = ['P2',15,7,10,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,10,10,10,0,7,7,7,0,5,0,2,2,2,0,0,0,0,10,0,7,0,7,0,5,0,2,0,2,0,0,10,10,10,0,7,0,7,0,5,0,2,2,2,0,0,10,0,0,0,7,0,7,0,5,0,0,0,2,0,0,10,10,10,0,7,7,7,0,5,0,2,2,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]\n",
    "voir_image(image_gris)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Image RVB"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "image_rvb = ['P3',4,4,255,255,0,0,0,255,0,0,0,255,100,100,100,255,255,0,255,255,255,0,0,0,50,50,50,255,100,0,255,0,100,0,100,0,0,0,100,100,255,50,150,100,50,30,30,30,20,20,20]\n",
    "voir_image(image_rvb)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercice 1 : inverser le noir et le blanc\n",
    "\n",
    "Nous allons modifier l'image noir et blanc.\n",
    "\n",
    "Compléter les ... ci-dessous pour que le programme change les pixels noirs en blanc et inversement."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "image = ['P1',18,9,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,0,1,0,0,0,1,0,1,1,1,1,1,0,0,1,0,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,0,1,0,0,0,0,1,1,0,0,1,0,0,0,1,0,0,0,0,1,1,1,1,0,1,0,1,0,1,0,0,0,1,0,0,0,0,0,0,0,1,0,1,0,0,1,1,0,0,0,1,0,0,0,0,0,0,0,1,0,1,0,0,0,1,0,0,0,1,0,0,0,0,1,1,1,1,0,1,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]\n",
    "\n",
    "i = 3\n",
    "\n",
    "while i < len(image):\n",
    "    if image[i] == 0:\n",
    "        image[i] = ...\n",
    "    else:\n",
    "        image[i] = ...\n",
    "    i = ...\n",
    "\n",
    "print(image)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "voir_image(image)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Images aléatoires\n",
    "\n",
    "randint(0,1) fournit un entier aléatoire : 0 ou 1 (comme si on jouait à pile ou face avec une pièce équilibrée)."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "from random import randint\n",
    "\n",
    "largeur = 50\n",
    "hauteur = 50\n",
    "taille_liste = largeur*hauteur + 3\n",
    "\n",
    "i = 3\n",
    "image_hasard = ['P1',largeur,hauteur]\n",
    "\n",
    "while i < taille_liste :\n",
    "    image_hasard = image_hasard + [randint(0,1)]  # à chaque passage dans la boucle, on ajoute un nombre à la liste\n",
    "    i = i+1\n",
    "    \n",
    "#print(image)\n",
    "voir_image(image_hasard)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Exercice 2\n",
    "\n",
    "En s'inspirant du programme ci-dessus, créer une image aléatoire en niveaux de gris.\n",
    "\n",
    "Si on choisit 10 niveaux de gris, randint(0,10) donnera un entier aléatoire entre 0 et 10 (0 et 10 compris)."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Exercice 3\n",
    "\n",
    "Créer une image aléatoire RVB :"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Exercice 4\n",
    "\n",
    "Observer l'image :\n",
    "\n",
    "<img src=\"image_degrade.png\" width=\"600\" height=\"30\">"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Ecrire le programme qui affiche cette image (20 pixels) : "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### Exercice 5\n",
    "Ecrire un programme qui affiche un damier (plateau de jeu d'échec) de 8 sur 8.\n",
    "\n",
    "Prévoir le passage à un damier de 100 sur 100..."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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