init

dcm4chee/default/tmp/deploy/tmp7473912347174030350oviyam2-exp.war/js/dicom/LookupTable.js

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+/**
+ *  LookupTable.js
+ *  Version 0.5
+ *  Author: BabuHussain<babuhussain.a@raster.in>
+ */
+function LookupTable() {
+	this.ylookup;
+	this.rescaleSlope;
+	this.rescaleIntercept;
+	this.windowCenter;
+	this.windowWidth;
+	this.lutSize;
+	this.minPixel;
+	this.maxPixel;
+	this.getPixelAt = getPixelAt;
+	this.calculateLookup = calculateLookup;
+	this.setWindowingdata = setWindowingdata;
+	this.setPixelInfo = setPixelInfo;
+}
+
+LookupTable.prototype.setData = function(wc, ww, rs, ri,bitsStored, invert) {	
+	this.rescaleSlope = rs;
+	this.rescaleIntercept = ri;
+	this.windowCenter = wc;
+	this.windowWidth = ww;			
+	this.lutSize = Math.pow(2, parseInt(bitsStored));	
+	this.invert = invert;	
+}
+
+var setPixelInfo = function(minPix,maxPix,invert) {
+	this.minPixel = minPix;
+	this.maxPixel = maxPix;	
+	this.invert = invert;
+};
+
+var setWindowingdata = function(wc, ww) {
+	this.windowCenter = wc;
+	this.windowWidth = ww;
+}
+
+function calculateLookup() {
+	this.ylookup=new Array(this.lutSize);
+	for(var inputValue=this.minPixel;inputValue<=this.maxPixel;inputValue++) {
+		var lutVal = ((((inputValue * this.rescaleSlope + this.rescaleIntercept) - (this.windowCenter)) / (this.windowWidth) + 0.5) * 255.0);
+         var newVal = Math.min(Math.max(lutVal, 0), 255);
+         this.ylookup[inputValue] = this.invert===true ? Math.round(255 - newVal) : Math.round(newVal);
+	}
+}
+
+function getPixelAt(i) {
+	return i!=undefined ? (i * this.rescaleSlope + this.rescaleIntercept) : 0;	
+}