Opencv.js via npm for blob-detection (#1185)

src/modules/BlobAnalysis/Module.js

@@ -0,0 +1,43 @@
+
+module.exports = function BlobAnalysis(options, UI){
+
+  var output;
+  
+  function draw(input, callback, progressObj) {
+  
+    progressObj.stop(true);
+    progressObj.overrideFlag = true;
+  
+    var step = this;
+
+    var priorStep = this.getStep(-1); // get the previous step to process it
+
+    function extraManipulation(pixels){
+  
+      pixels = require('./BlobAnalysis')(pixels, options, priorStep);
+      return pixels;
+    }
+  
+    function output(image, datauri, mimetype){
+  
+      step.output = { src: datauri, format: mimetype};
+    }
+  
+    return require('../_nomodule/PixelManipulation.js')(input, {
+      output: output,
+      extraManipulation: extraManipulation,
+      format: input.format,
+      image: options.image,
+      inBrowser: options.inBrowser,
+      callback: callback
+    });
+  
+  }
+  
+  return {
+    options: options,
+    draw: draw,
+    output: output,
+    UI: UI
+  };
+};