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pages/video.py
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import streamlit as st
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import numpy as np
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import matplotlib.pyplot as plt
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import seaborn as sns
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# Title
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st.title("Understanding Video Data and Processing with OpenCV")
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# Subheader 1: What is Video Data?
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st.markdown("### What is Video Data?")
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st.markdown("""
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- **Video** is a collection of images known as **frames**.
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- Frames are visualized sequentially, creating the perception of motion.
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- **Frame Rate (FPS)** determines smoothness:
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- **30 FPS**: 30 frames per second.
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- **60 FPS**: 60 frames per second.
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- More FPS = smoother video.
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""")
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# Subheader 2: How to Play a Video Using OpenCV
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st.markdown("### :blue[How to Play a Video Using OpenCV]")
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st.markdown("""
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1. **Break the Video into Frames**:
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- A video is essentially a sequence of images (frames).
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- Use a `while` loop to iterate through frames, as the total frame count may not be known.
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2. **Key Functions**:
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- `cv2.VideoCapture(path)`: Captures the video and extracts frames.
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- `cv2.imshow()`: Displays a frame in a pop-up window.
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- `cv2.waitKey(1)`: Waits for 1 millisecond before moving to the next frame.
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3. **Exit Condition**:
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- Exit the loop when frames are exhausted or a specific key is pressed.
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""")
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# Subheader 3: Frame Handling Details
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st.markdown("### Frame Handling Details")
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st.markdown("""
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- Each frame contains:
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1. **Images**: Represented as 3D arrays (height, width, and color channels).
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2. **Boolean Values**:
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- `True`: Frame is present.
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- `False`: No frame, signaling the loop to terminate.
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""")
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# Subheader 4: Converting Video to Tabular Data
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st.markdown("### :green[Converting Video to Tabular Data]")
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st.markdown("""
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1. Use `cv2.VideoCapture()` to capture frames.
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2. Convert the frames into tabular data, where each frame's pixel values are rows or columns.
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""")
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# Subheader 5: Color Space Conversion
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st.markdown("### Color Space Conversion")
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st.markdown("""
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- OpenCV allows color space changes with `cv2.cvtColor()`.
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- **Syntax**: `cv2.cvtColor(img, cv2.COLOR_<source>2<destination>)`
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- Example:
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```python```
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img = cv2.imread("path/to/image")
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gray_img = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY
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""",unsafe_allow_html=True)
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from PIL import Image
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# Set the title of the app
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# Function to generate Black & White and Grayscale Images
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def generate_bw_and_grayscale():
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# Create Black & White binary image
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bw_image = np.array([[0, 1, 0, 1],
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[1, 0, 1, 0],
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[0, 1, 0, 1],
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[1, 0, 1, 0]])
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# Create Grayscale image
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grayscale_image = np.array([[0, 64, 128, 255],
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[255, 128, 64, 0],
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[0, 64, 128, 255],
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[255, 128, 64, 0]])
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# Plot and save the Black & White and Grayscale images
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fig, axes = plt.subplots(1, 2, figsize=(10, 5))
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# Black & White
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axes[0].imshow(bw_image, cmap='binary', interpolation='nearest')
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axes[0].set_title("Black & White Image")
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axes[0].axis('off')
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# Grayscale
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axes[1].imshow(grayscale_image, cmap='gray', interpolation='nearest')
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axes[1].set_title("Grayscale Image")
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axes[1].axis('off')
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plt.tight_layout()
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return fig
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# Function to generate RGB Color Space Images
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def generate_rgb_color_space():
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# Create RGB arrays
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red = np.zeros((4, 4, 3), dtype=int)
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green = np.zeros((4, 4, 3), dtype=int)
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blue = np.zeros((4, 4, 3), dtype=int)
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# Add intensity to respective channels
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red[:, :, 0] = 255 # Red channel
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green[:, :, 1] = 255 # Green channel
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blue[:, :, 2] = 255 # Blue channel
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# Plot RGB components
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fig, axes = plt.subplots(1, 3, figsize=(15, 5))
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# Red
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axes[0].imshow(red)
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axes[0].set_title("Red Component")
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axes[0].axis('off')
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# Green
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axes[1].imshow(green)
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axes[1].set_title("Green Component")
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axes[1].axis('off')
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# Blue
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axes[2].imshow(blue)
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axes[2].set_title("Blue Component")
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axes[2].axis('off')
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plt.tight_layout()
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return fig
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# Generate Black & White and Grayscale Images
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st.subheader("Black & White and Grayscale Images")
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bw_grayscale_fig = generate_bw_and_grayscale()
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st.pyplot(bw_grayscale_fig)
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# Generate RGB Color Space Images
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st.subheader("RGB Color Space Visualization")
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rgb_fig = generate_rgb_color_space()
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st.pyplot(rgb_fig)
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