Point Measurements

The Point Measurement tool measures a collection of point coordinates and values on an image. In addition to reporting the pixel value, or "intensity", the pixel coordinates are reported in both (column,row) and world coordinates if the image has a world coordinate calibration. The coordinates are marked using the mouse crosshair or may be precision centroid coordinates computed near the clicked point. This command is like the Centroid measurement affiliated with the Image Cursor except this command operates from a toolbar and the the points are persistent until you leave the Points mode by closing the toolbar. This command allows many points to be drawn on the image whereas the centroid marks only one point at a time . Results are reported in the Points Measurement Pane. The toolbar opens in Marking Mode with the top button active. Marker properties are set in the Marker Properties dialog opened from the button on the Points toolbar. Points may also be measured using the CMeasurePoints class in the Pro Script Module. See the Mira Pro x64 Script User's Guide.

• To activate the Point Measurements toolbar, click on the Image Measurements Toolbar or use Measure > Points command on the main menu.

The following picture shows an Image Window with several points marked on the image. Notice the Point Measurements Toolbar docked on the left border of the Image Window.

The 3 points marked above created a Points Measurement Pane where the results are listed. Results can also be diverted to a top-level Report Window using the option in the Marker Properties dialog opened using the toolbar button.

Procedure

First, make sure Point Measurement command.

1. First, be sure the Drawing and Centroiding properties are set as desired. To open the Marker Properties dialog, click on the toolbar.

2. If Marking Mode is not active, click the button on the window toolbar (not the Image Measurements Toolbar).

3. Move the mouse pointer to each target point and click the left mouse button.

4. Repeat for each target point on the image.

5. To move an existing point, click on the Points toolbar to enter Move mode, then drag a marker to a new position and drop it there. To cause the centroids to be updated after the move, check Centroid after Move on the Centroid Properties (Markers) page:

6. • If centroiding is checked on the Centroid Properties (Markers) page, the marker will automatically centroid on near the point where it is dropped.

   • The results are reported in the Points measurement pane or window.

7. If points are no longer needed, click to enter Delete mode and click on the points to remove them.

8. To track marked points through an image set, click on the toolbar. See the TIP below regarding tracking the centroid.

9. To re-enter marking mode, click on the toolbar.

10. To disable all toolbar modes for Point Measurements, click on the Image Bar or select Disable Modes from the Image Context Menu.

Measurement Results

Measurements are tabulated in the Points pane as shown above. Using this window, the measurements may be sorted, rearranged, saved to the clipboard or a file, etc.

If the image has a World Coordinate System ("WCS") calibration and the Centroid First Point box is checked in the Point Properties dialog , then (X,Y) is a centroid position computed from the centroid (column,row) position.

The items in the Report are described in the table below.

Related Topics

Measuring Images

Distance & Angle Measurements

Plot Point Measurements

Measurement Panes

Image Windows

Pixel Coordinate Definition

Sub Pixel Coordinate Definition

World Coordinate System

Mira Pro x64 User's Guide, Copyright Ⓒ 2023 Mirametrics, Inc. All Rights Reserved.