Operation: find objects
Count and measure features of objects.
Options

min size: Objects smaller than min size are ignored.
max size: Objects bigger than max size are ignored.
display labels: If checked the title of the image is displayed in the results table.
exclude edge objects: If checked objects touching the edges of the image are ignored.
invert y: Inverts the y-coordinate so that the origin is in the lower left corner and not in the upper left corner anymore.
limit to threshold: If checked, only thresholded pixels are included in measurement calculations.
Use Image>Adjust>Threshold to set the threshold limits.
measure area: Measure the areas of objects in square pixels. Areas are in calibrated units, such as square millimeters, if Analyze>Set Scale was used to spatially calibrate the image.
measure bounds: Measure the smallest rectangle enclosing each object. Uses the headings BX, BY, Width and Height, where BX and BY are the coordinates of the upper left corner of the rectangle.
measure center of mass: This is the brightness-weighted average of the x and y
coordinates of all pixels in an object. Uses the XM and YM headings.
These coordinates are the first order spatial moments.
measure centroids: The center point of an object.
This is the average of the x and y coordinates of all of the pixels in the image or selection.
Uses the X and Y Results table headings.
measure circularity: 4pi(area/perimeter^2). A value of 1.0 indicates a perfect circle.
As the value approaches 0.0, it indicates an increasingly elongated polygon.
Values may not be valid for very small particles.
Feret's diameter: The longest distance between any two points along the selection
boundary. Also known as the caliper length.
measure fit ellipse: Fit an ellipse to the object. Uses the headings Major,
Minor and Angle. Major and Minor
are the primary and seconday axis of the best fitting ellipse.
Angle is the angle between the primary axis and a line
parallel to the x-axis of the image. Note that ImageJ cannot
calculate the major and minor axis lengths if
Pixel Aspect Ratio in the Set Scale dialog is not 1.0.
integrated density: The sum of the values of the pixels in the object.
measure mean: The average gray value within the object.
measure min & max: Minimum and maximum gray values within the object.
modal gray value: Most frequently occurring gray value within the object. Corresponds to the highest peak in the histogram.
measure perimeter: The length of the outside boundary of the object.
standard deviation: Standard deviation of the gray values used to generate
the mean gray value.
Parameter
The only parameter is the input image. This must either be a
two-dimensional, binary image (0 and 255) or a 2-dimensional image with
a threshold set in the threshold adjuster.
Results
Measurements (ResultsTable): The results table containing the measurements of the found objects. Each line represents one object.
Mask (ImagePlus): A mask showing the objects that have been taken into account.
Outlines (ImagePlus): A drawing of the outer outlines of the objects that have been taken into account.