Open-CV-Implementations

Author: altruistcoder

README.md

@@ -10,6 +10,10 @@ This is a repository of code files which can be used to perform some basic tasks
 
  Python Code to load and display an image using OpenCV.
 
+* [Changing Resolution & Rescaling of Frame of an Image ](https://github.com/altruistcoder/Open-CV-Implementations/blob/master/changing_resolution_and_scaling.ipynb):
+
+ Python Code to load and display an image using OpenCV.
+
 * [Drawing Geometric Figures on Images](https://github.com/altruistcoder/Open-CV-Implementations/blob/master/drawing_figures_on_image.ipynb):
 
  Python Code to draw geometric figures like lines, rectangles, circles and concentric circles on an image using OpenCV.

changing_resolution_and_scaling.ipynb

@@ -0,0 +1,157 @@
+{
+ "cells": [
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "# Changing Resolution and Rescaling of Frame of an Image using OpencV"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 1,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "import cv2"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Adjusting Resolution of an Image"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 2,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "def make_1080p():\n",
+ " cap.set(3, 1920)\n",
+ " cap.set(4, 1080)\n",
+ "\n",
+ "def make_720p():\n",
+ " cap.set(3, 1280)\n",
+ " cap.set(4, 720)\n",
+ "\n",
+ "def make_480p():\n",
+ " cap.set(3, 640)\n",
+ " cap.set(4, 480)\n",
+ "\n",
+ "def change_res(width, height):\n",
+ " cap.set(3, width)\n",
+ " cap.set(4, height)"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 4,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "cap = cv2.VideoCapture(0)\n",
+ "\n",
+ "# make_720p()\n",
+ "change_res(800, 400)\n",
+ "\n",
+ "while True:\n",
+ " ret, frame = cap.read()\n",
+ " cv2.imshow('Frame', frame)\n",
+ " \n",
+ " if cv2.waitKey(20) & 0xFF == ord('q'):\n",
+ " break\n",
+ "\n",
+ "cap.release()\n",
+ "cv2.destroyAllWindows()"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "## Scaling of the Frames"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 5,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "def rescale_frame(frame, percent=75):\n",
+ " width = int(frame.shape[1] * percent/ 100)\n",
+ " height = int(frame.shape[0] * percent/ 100)\n",
+ " dim = (width, height)\n",
+ " return cv2.resize(frame, dim, interpolation =cv2.INTER_AREA)"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": 7,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "cap = cv2.VideoCapture(0)\n",
+ "\n",
+ "while True:\n",
+ " rect, frame = cap.read()\n",
+ " cv2.imshow(\"Original Frame\", frame)\n",
+ " frame75 = rescale_frame(frame, percent=75)\n",
+ " cv2.imshow('Frame75', frame75)\n",
+ " frame150 = rescale_frame(frame, percent=150)\n",
+ " cv2.imshow('Frame150', frame150)\n",
+ " \n",
+ " if cv2.waitKey(20) & 0xFF == ord('q'):\n",
+ " break\n",
+ "\n",
+ "cap.release()\n",
+ "cv2.destroyAllWindows()"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
+ "source": []
+ },
+ {
+ "cell_type": "code",
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
+ "source": []
+ },
+ {
+ "cell_type": "code",
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
+ "source": []
+ }
+ ],
+ "metadata": {
+ "kernelspec": {
+ "display_name": "Python 3",
+ "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": "3.5.2"
+ }
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}