Add pixel classifier measurements to all cells in an image using QuPath

QuPath-Add pixel classifier measurements to cells.groovy

/**
 * Add pixel classifier measurements to all cells in an image.
 * 
 * This is intended to overcome the fact that measurements can be quite slow because they aren't parallelized.
 * 
 * Written for QuPath v0.3.2.
 * See https://forum.image.sc/t/qupath-measure-pixel-classifier-area-per-cell-detection-for-wsis/72701
 * 
 * Warning! This hasn't been extensively tested - please report any problems on the forum.
 *
 * @author Pete Bankhead
 */

// Define measurement ID and size of the sublists to work with
String pixelClassifierName = 'Some classifier name'
String measurementID = 'Some measurement'
int subListLength = 128

// Get the current image and load a pixel classifier
def imageData = getCurrentImageData()
def pixelClassifier = loadPixelClassifier(pixelClassifierName)

// Get all the cells
def cells = getCellObjects()

// Split into smaller lists
def littleLists = cells.collate(subListLength)

// Process the little lists in parallel
littleLists.parallelStream()
    .forEach(list -> {
        // Create a measurement manager for the image and classifier
        def manager = PixelClassifierTools.createMeasurementManager(imageData, pixelClassifier)
        PixelClassifierTools.addMeasurements(list, manager, measurementID)
    })

// Fire update event
fireHierarchyUpdate()