Calculate Object Distance from Camera using OpenCV Android
Accurately measuring the distance of objects from a camera is crucial in various Android applications, such as augmented reality, 3D mapping, and robotics. OpenCV, an open-source computer vision library, provides tools to achieve this. Our calculator simplifies this process, ensuring precision and efficiency.
- Enter the focal length of your camera lens in millimeters.
- Enter the width of the object you’re measuring in millimeters.
- Enter the width of the object in pixels as it appears in the captured image.
- Click ‘Calculate’ to find the object’s distance from the camera.
The formula used in this calculator is based on the principle of similar triangles. Given the focal length (f), object width (w), and image width (i), the distance (d) can be calculated as:
d = (f * w) / i
| Method | Focal Length (mm) | Object Width (mm) | Image Width (px) | Distance (m) |
|---|---|---|---|---|
| Manual | 5 | 100 | 640 | 7.81 |
| Calculator | 5 | 100 | 640 | 7.81 |
- Ensure the camera is perpendicular to the object for accurate measurements.
- Use a high-resolution image for better precision.
- Consider the lens’s focal length and sensor size for accurate calculations.
What is the unit of measurement for the object width?
The object width should be measured in millimeters.
For more information, refer to the OpenCV documentation.