📉 A Complete Guide to the Edge Location Tool

PhenoCapture’s Edge Location tool is a powerful analytical feature designed to automatically detect structural boundaries and edges within your image using line profiles. By analyzing the color and intensity changes along a line you draw, the tool uses mathematical derivatives to pinpoint up to three distinct edge locations with sub-pixel precision.

💡 Key Features

• Live Line Profile Analysis: The moment you open the tool, your workspace automatically switches to the Line selection mode. As you adjust the line on your image, the profile graphs update in real-time!
• Multi-Channel Support: You are not limited to just grayscale. You can extract edge profiles based on Red, Green, Blue, Gray, Hue, Saturation, or Intensity channels to find exactly the boundary you need.
• Advanced Mathematical Detection: The tool calculates the 1st Derivative (rate of change) and 2nd Derivative (acceleration of change) to scientifically pinpoint the steepest edges along your line.
• Smart Noise Removal: Images can be grainy. By checking the Noise Removal option, the software applies an automated smoothing filter to your profile data, preventing false edge detection.
• Instant Data Export: Need the raw numbers for a research paper or spreadsheet? You can instantly copy the tabulated numerical data (Location, Color Value, 1st & 2nd Derivatives) or the profile graph image directly to your clipboard.

🛠️ How to Use the Edge Location Tool

Step 1: Draw Your Analysis Line

When you open the tool, your main workspace will automatically lock into the Line selection tool. Draw a line across the boundary or edge you want to measure.

Step 2: Choose Your Channel and Settings

Select the color channel that provides the best contrast for your edge (e.g., Radio Gray or Radio Intensity).

• Check Noise Removal if your image is grainy.
• Toggle the 1st Deriv or 2nd Deriv checkboxes to view the mathematical breakdown of your line profile directly on the graph.
• Check View Guide Line to visually see exactly where the software is placing the detected edges on the graph.

Step 3: Adjust the Slope Threshold

The tool identifies an edge when the 1st derivative (the slope) exceeds a certain value. Use the Slope Threshold dropdown to set this sensitivity.

• Lower the threshold to detect subtle edges.
• Raise the threshold to ignore minor variations and only detect sharp, obvious boundaries.

Step 4: Read Your Results

The tool will automatically scan the profile and identify up to three of the most prominent edges along your line. The exact pixel coordinates for these boundaries will be displayed in the 1st Heat, 2nd Heat, and 3rd Heat text boxes.

Step 5: Export Your Data

• Click the Copy Data icon in the toolbar to copy the entire mathematical table (perfect for pasting into Excel).
• Click the Copy Image icon to copy the visual profile graph for your presentations or reports.