1D Measurement

This tool allows creating lines to measure an element in the image or to build a profile of the pixel intensities of the current image. If there is no spatial calibration, the segment length value is displayed in pixels.

In the toolbar above, the first toggle button (the one after the hand) allows selecting or moving drawings, the three next ones allows creating new lines: segment, polyline and freehand line. The two arrow buttons allow going from one segment to another. The last button will delete the selected drawings.

The Show Profile button opens the profile of the pixel intensities of the current image. The min and max values (yellow horizontal lines on the plot) limit the range of the pixel intensities shown in the Statistics and Data tables. In the Statistics table, the Threshold ratio gives the ratio between all the line pixels and the number of the pixels which have intensities in the limited range. The selected table can be saved in CSV format.

Note: When moving or resizing a line, or when the image is changed, the profile is automatically actualized.

Note: When moving along the profile plot, a pointer shows the corresponding position on the image and pixel information appears in the status bar.

1D Measurement Descriptors

Position:

First point X: X coordinate position (image) of the first point of the line.
First point Y: Y coordinate position (image) of the first point of the line.
Last point X: X coordinate position (image) of the last point of the line.
Last point Y: Y coordinate position (image) of the last point of the line.
Barycenter x: X coordinate position (image) of the center of gravity of the line.
Barycenter y: Y coordinate position (image) of the center of gravity of the line.

Note: The image position (0,0) is located by default in the upper left corner . However, the origin and the direction of the y axis can be modified in the Spatial Calibration tool.

Basic:

Line length: Length of the line.
Orientation: Angle between the horizontal axis and the line (0-180 degrees, counterclockwise).
Orientation significance: Define the significance (0 to 1) of the orientation according to the line shape. A straight line has the value 1. Conversely, a tortuous line will have a lower value.
Azimuth: Horizontal angular distance from the northern point (at the top). The measurement is made clockwise through 360° by placing the center of the circle on the first point of the line.
Azimuth significance: The ratio between the line length and the Euclidian distance between the first and the last point defines the significance (0 to 1) of the azimuth. A straight line has the value 1.
Color (RGB): Color of the line, defined by the red, green and blue components.

1D Measurement preferences

Only the checked parameters will appear in the Selected Drawing panel and in the Data Viewer.

Note: To display the preferences, open the Project Preferences window and select 1D measurement.