Update pages/Data Collection.py

pages/Data Collection.py

@@ -1376,6 +1376,72 @@ elif st.session_state.current_page == "image_transformations":
     cv2.destroyAllWindows()
     """, language="python")
 
+    # Explanation for Rotation
+    st.markdown("""
+        <h3 style="color: #9400d3;">Rotation</h3>
+    """, unsafe_allow_html=True)
+    
+    st.write("""
+    **Rotation** involves rotating an image around a specified center point by a given angle. It changes the orientation of the image while preserving its content.
+    
+    The rotation is performed using a rotation matrix:
+
+    [[cos(θ), -sin(θ), tx], [sin(θ), cos(θ), ty]]
+
+    Here:
+    - **θ (theta)**: Specifies the rotation angle in degrees.
+    - **tx, ty**: Specifies the adjustments to reposition the rotated image.
+    - **Scale**: A factor that can resize the image during rotation.
+    """)
+    
+    # Code Example
+    st.code("""
+    # Define the rotation matrix
+    r_m = cv2.getRotationMatrix2D((1347, 900), 50, 1)  # Center at (1347, 900), Rotate by 50 degrees, Scale = 1
+    
+    # Apply rotation
+    r_img = cv2.warpAffine(img, r_m, (580, 500), borderMode=cv2.BORDER_DEFAULT)
+    
+    # Display the images
+    cv2.imshow("Original Image", img)
+    cv2.imshow("Rotated Image", r_img)
+    
+    cv2.waitKey(0)
+    cv2.destroyAllWindows()
+    """, language="python")
+
+    # Explanation for Direct Rotation
+    st.markdown("""
+        <h3 style="color: #9400d3;">Direct Rotation Using cv2.rotate</h3>
+    """, unsafe_allow_html=True)
+    
+    st.write("""
+    OpenCV provides a direct method for rotating images with predefined angles: `cv2.rotate`. 
+    This method simplifies rotation operations for 90°, 180°, and 270° (clockwise or counterclockwise) without requiring a custom rotation matrix.
+    
+    ### Available Rotation Modes:
+    - **`cv2.ROTATE_180`**: Rotates the image by 180°.
+    - **`cv2.ROTATE_90_CLOCKWISE`**: Rotates the image by 90° clockwise.
+    - **`cv2.ROTATE_90_COUNTERCLOCKWISE`**: Rotates the image by 90° counterclockwise.
+    """)
+    
+    # Code Example
+    st.code("""
+    # Rotate the image using predefined rotation modes
+    img1 = cv2.rotate(img, cv2.ROTATE_180)  # Rotate 180 degrees
+    img2 = cv2.rotate(img, cv2.ROTATE_90_CLOCKWISE)  # Rotate 90 degrees clockwise
+    img3 = cv2.rotate(img, cv2.ROTATE_90_COUNTERCLOCKWISE)  # Rotate 90 degrees counterclockwise
+    
+    # Display the images
+    cv2.imshow("Original Image", img)
+    cv2.imshow("Rotated 180°", img1)
+    cv2.imshow("Rotated 90° Clockwise", img2)
+    cv2.imshow("Rotated 90° Counterclockwise", img3)
+    
+    cv2.waitKey(0)
+    cv2.destroyAllWindows()
+    """, language="python")
+