# Minimum Rectangle

This function block calculates and draws the minimum enclosing rectangle around a provided contour. It is useful to quickly get the bounding box, center position and size of a detected shape for further processing or visualization.

## 📥 Inputs <a href="#inputs" id="inputs"></a>

* `Image Any` The image used as background for visualization.
* `Contour` The shape/contour to be enclosed by the minimum rectangle.

## 📤 Outputs <a href="#outputs" id="outputs"></a>

* `Image` The image with the bounding rectangle drawn.
* `Center` The center position of the rectangle (x, y).
* `Width` The rectangle width in pixels.
* `Height` The rectangle height in pixels.
* `Rectangle` The rectangle shape data representing the enclosing box.

## 🕹️ Controls <a href="#controls" id="controls"></a>

This block has no additional user-facing controls.

## 🎨 Features <a href="#features" id="features"></a>

* Draws a clear bounding rectangle around the supplied contour for immediate visual feedback.
* Returns both geometric measurements (center, width, height) and a rectangle shape that can be fed into other blocks.
* Works with any contour-like shape produced by contour detection or shape analysis blocks.

## 📝 Usage Instructions <a href="#usage" id="usage"></a>

1. Provide a detected contour to the `Contour` input (for example, from a contour detection block).
2. Provide the source image to the `Image Any` input so the rectangle can be drawn on top of it.
3. Use the outputs for visualization, measurement, downstream ROI extraction or logic decisions.

## 📊 Evaluation <a href="#evaluation" id="evaluation"></a>

When executed, the block computes the axis-aligned bounding rectangle for the input contour, overlays this rectangle on the provided image, and outputs the annotated image plus the rectangle center, width, height and rectangle data.

## 💡 Tips and Tricks <a href="#tips-and-tricks" id="tips-and-tricks"></a>

* To obtain contours to feed into this block, use the `Find Contour` block.
* For a simplified contour with fewer vertices before bounding, use `Approximate Contour`.
* To crop the region inside the rectangle for further analysis, combine this block with `Get ROI` or `Contour to Image`.
* Visualize or emphasize results by piping the output image into `Draw Rectangle` or `Draw Result On Image`.
* If you need a tighter or rotated fit, compare results with `Minimum Rotated Rectangle`, `Minimum Ellipse`, or `Minimum Circle`.
* For shape validation or filtering, consider `Hull Convex` before measuring, or use `Measure Object Distance` to compare positions between multiple detected objects.

## 🛠️ Troubleshooting <a href="#troubleshooting" id="troubleshooting"></a>

* No rectangle appears: ensure a valid contour is provided (use `Find Contour` or confirm the contour source block produced results).
* Unexpected rectangle size: verify the contour coordinates are in the same image coordinate system and that the provided image matches the contour source.
* Noisy contours: apply preprocessing such as `Blur`, `Image Threshold`, or morphological operations to clean the contour before passing it to this block.