init

README.md

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+# tesseract.js

Tesseract.js

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+var Tesseract = {}
+
+Tesseract.recognize = function(image, options, callback){
+	var lang = options.lang
+	if(typeof lang === "undefined"){
+		lang = 'eng'
+	}
+
+	if (typeof options === 'string') {
+		lang = options
+		options = {}
+	}
+
+	if (typeof options === "function") {
+		callback = options
+		options = {}
+	}
+
+
+	if(image.getContext){
+		image = image.getContext('2d');
+	}else if(image.tagName == "IMG" || image.tagName == "VIDEO"){
+		var c = document.createElement('canvas');
+		if(image.tagName == "IMG"){
+			c.width  = image.naturalWidth;
+			c.height = image.naturalHeight;
+		}else if(image.tagName == "VIDEO"){
+			c.width  = image.videoWidth;
+			c.height = image.videoHeight;
+		}
+		var ctx = c.getContext('2d');
+		ctx.drawImage(image, 0, 0);
+		image = ctx;
+	}
+	if(image.getImageData) image = image.getImageData(0, 0, image.canvas.width, image.canvas.height);		
+
+	var worker = new Worker('./worker.js')
+
+	if(typeof callback === "function"){
+		worker.onmessage = function(e){
+			callback(e.data.err, e.data.result)
+		}
+		worker.postMessage({image: image, lang: lang})		
+		console.log('callback')
+	}
+	else {
+		return new Promise(function(resolve, reject){
+			worker.onmessage = function(e){
+				if(e.data.err){
+					reject(e.data.err)
+				}
+				else {
+					resolve(e.data.result)
+				}
+			}
+			worker.postMessage({image: image, lang: lang, options: options})
+			console.log('promise')			
+		})
+	}
+}

example.htm

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+<canvas id="c"></canvas>
+<script type="text/javascript" src="./Tesseract.js"></script>
+<script type="text/javascript">
+	var canvas = document.getElementById('c')
+	canvas.width = 400
+	canvas.height = 400
+	var ctx = canvas.getContext('2d');
+	ctx.font = '30px "Arial Black"'
+	ctx.fillText('Hell0 World', 100, 40)
+	// ctx.fillText("囚犯離奇掙脫囚犯離奇掙脫", 100, 40)
+	ctx.font = '30px "Times New Roman"'
+	ctx.fillText('from beyond', 100, 80)
+	// ctx.fillText('2小時可換乘2次2小時可換乘2次', 100, 80)
+	ctx.font = '30px sans-serif'
+	ctx.fillText('the Cosmic Void', 100, 120)
+	Tesseract.recognize(canvas,{tessedit_char_blacklist:'e'}).then( function(d){ console.log(d) } )
+</script>