Calling cv2_imshow in jupyter notebook

cv2_imshow_from_jupyter.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "a763c365-f965-40cd-8877-ffaea9f8885b",
   "metadata": {},
   "source": [
    "## Overview\n",
    "\n",
    "`cv2_imshow` is an opencv image rendering function available on **Google Colab** from `google.colab.patches` module.  \n",
    "You may be unable to use it locally within **Jupyter Notebook** though.  \n",
    "\n",
    "You may use the definition below for the `cv2_imshow` function to get the code to work locally."
   ]
  },
  {
   "cell_type": "markdown",
   "id": "abfd3459-19fa-4b09-954e-2e4d76c23063",
   "metadata": {},
   "source": [
    "## Import Libraries"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "74fb2b55-02d9-4c32-a359-c698c565dfe8",
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "import numpy as np \n",
    "import cv2\n",
    "# comment the original import from google.colab.patch\n",
    "# from google.colab.patches import cv2_imshow \n",
    "\n",
    "# import pytplot from matplotlib if not already imported\n",
    "import matplotlib.pyplot as plt\n",
    "\n",
    "# for inline plot rendering\n",
    "%matplotlib inline"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "00405dab-26d3-4b1e-8d17-8d147ca042b3",
   "metadata": {},
   "source": [
    "## Override cv2_imshow"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "ba71b471-50da-4b94-9603-b1071278f226",
   "metadata": {
    "tags": []
   },
   "outputs": [],
   "source": [
    "def cv2_imshow(img):\n",
    "    # set appropriate figure size in case it is too small or too large. Don't worry about it being square.\n",
    "    plt.figure(figsize=(10,10))\n",
    "    try:\n",
    "        # try simple BGR 2 RGB conversion so pyplot can show the image\n",
    "        plt.imshow(cv2.cvtColor(img, cv2.COLOR_BGR2RGB))\n",
    "    except:\n",
    "        # this is for a special case in case the above doesn't work after applying convolutions\n",
    "        plt.imshow(cv2.cvtColor(np.uint8(np.absolute(img)), cv2.COLOR_BGR2RGB))\n",
    "    plt.show()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "8a46c049-3bc6-4fae-bb43-ec8657fd3c00",
   "metadata": {},
   "outputs": [],
   "source": []
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3 (ipykernel)",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.10.9"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 5
}