Computer Vision Bounding Box Operations
When resizing images in computer vision applications, bounding box coordinates must be scaled proportionally to maintain accurate object detection.
import cv2
import numpy as np
from ultralytics.utils.ops import scale_boxes
# Load the original image
original_image = cv2.imread("sample_images/vehicle.jpg")
original_height, original_w ...
Posted on Fri, 12 Jun 2026 16:37:48 +0000 by chancho
Geographic Coordinate System Transformations
Spatial Reference SystemsWGS-84: The standard geodetic reference system used globally. It serves as the foundation for GPS and is adopted by international mapping platforms like Google Maps.GCJ-02: Often referred to as the Mars coordinate system. It is an obfuscated version of WGS-84 implemented for regulatory compliance, utilized by services s ...
Posted on Sat, 23 May 2026 21:24:11 +0000 by Allen4172
OpenCV and ROS: Technical Notes on Image Processing, Build Systems, and Coordinate Transformations
OpenCV Fundamentals
Single Channel Display in OpenCV
When extracting and displaying a single B, G, or R channel from a full-color image, the result appears as a grayscale image. This is not actually a grayscale representation—it uses black, white, and shades of gray for display purposes. The intensity corresponds to the channel's value: brighte ...
Posted on Fri, 15 May 2026 21:19:08 +0000 by sujithfem