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   "source": [
    "# Lesson 5 exercises\n",
    "\n",
    "<hr />"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise 5.1\n",
    "\n",
    "What is an ROI, and why is it an important concept in digital image processing?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br />"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise 5.2\n",
    "\n",
    "What is **segmentation** in the context of image processing?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br />"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise 5.3\n",
    "\n",
    "What is **thresholding**, and what is it used for?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br />"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise 5.4\n",
    "\n",
    "What is a **structuring element** and what is it used for?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br />"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise 5.5\n",
    "\n",
    "How would you define an **edge** in an image? Describe how a Laplacian of Gaussian filter can be used to find edges in an image. Why can't we just use a Laplacian filter without the Gaussian?"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<br />"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## Exercise 5.6\n",
    "\n",
    "Write down any questions or points of confusion that you have."
   ]
  }
 ],
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