Minimum Ellipse

This function block is designed to fit a minimum enclosing ellipse around a specified contour in an image. It helps in shape analysis by providing the parameters of the ellipse that best represents the contour.

📥 Inputs

Image Any The input image in which the contour exists.

Contour The contour data representing the shape you want to analyze.

📤 Outputs

Image The modified input image that displays the fitted minimum enclosing ellipse.

Center The center point of the fitted ellipse.

Radius1 The length of the first radius of the ellipse.

Radius2 The length of the second radius of the ellipse.

Angle The rotation angle of the ellipse.

🕹️ Controls

This block does not include direct user controls as inputs are provided externally via connected function blocks.

🎨 Features

Minimum Enclosing Ellipse Accurately fits and represents a contour with an ellipse that has the smallest possible size.

Visual Feedback The output image visually marks the fitted ellipse on the original input image, allowing easy identification of the shape.

📝 Usage Instructions

1. Input Image: Connect the image containing the desired contour to the Image Any input.

2. Input Contour: Connect or provide contour data to the Contour input.

3. Evaluate: Run the block to compute the minimum enclosing ellipse around the given contour. The output will include the modified image and parameters of the ellipse.

📊 Evaluation

When executed, this function block will output an image with the fitted minimum ellipse drawn, along with parameters that define the ellipse: the center, radii, and angle of rotation.

💡 Tips and Tricks

Finding Contours

Before using this block, ensure you have a valid contour. You may use Find Contour function block to extract contours from binary images.

Visualizing Multiple Contours

For complex images with multiple contours, consider using Draw Rectangle or Draw Detections blocks to visualize each fitted ellipse.

Parameter Analysis

The parameters of the ellipse output can help you understand the orientation and dimensions of the objects being analyzed. This information can be particularly useful in object recognition scenarios.

🛠️ Troubleshooting

Ellipse Not Visible

If the ellipse is not appearing on the output image, ensure that the provided contour is valid and lies within the bounds of the image. A poorly defined contour may lead to no visible fitting.

Contour Data Issues

Make sure that the contour data being fed into the block is in the appropriate format (e.g., as a NumPy array). Invalid input formats may lead to processing errors.