From 077c911cca31dc5a8d8ca3a317e6d43d88ea46ee Mon Sep 17 00:00:00 2001
From: kekee000 <kekee000@126com>
Date: Mon, 9 Mar 2015 22:08:14 +0800
Subject: [PATCH] add find contour

---
 demo/js/canvasImage.js             |   2 +-
 src/graphics/image/findContours.js | 168 +++++------------------------
 test/add.bmp                       | Bin 0 -> 214874 bytes
 test/circle.bmp                    | Bin 0 -> 82510 bytes
 test/contour.png                   | Bin 0 -> 18879 bytes
 5 files changed, 28 insertions(+), 142 deletions(-)
 create mode 100644 test/add.bmp
 create mode 100644 test/circle.bmp
 create mode 100644 test/contour.png

diff --git a/demo/js/canvasImage.js b/demo/js/canvasImage.js
index 8a4078c..46ff232 100644
--- a/demo/js/canvasImage.js
+++ b/demo/js/canvasImage.js
@@ -21,7 +21,7 @@ define(
                 var cvsW = context.width;
 
                 var img = new Image();
-                img.src = "../test/add.gif";
+                img.src = "../test/contour.png";
                 var width;
                 var height;
                 img.onload = function (){
diff --git a/src/graphics/image/findContours.js b/src/graphics/image/findContours.js
index 386b0d6..cc9a818 100644
--- a/src/graphics/image/findContours.js
+++ b/src/graphics/image/findContours.js
@@ -22,7 +22,7 @@ define(
          * @param  {boolean} isClockwise 是否顺时针
          * @return {Array}               找到的轮廓点集
          */
-        function findContour(imageData, startPoint, isInContour, isClockwise) {
+        function findContour(imageData, startPoint, isInContour) {
             var data = imageData.data;
             var width = imageData.width;
             var height = imageData.height;
@@ -37,66 +37,15 @@ define(
             var contour = [startPoint];
             var finded;
             do {
-                startIndex = index + 8 + (isClockwise ? 3 : 7);
+                startIndex = index + 11;
                 finded = false;
                 for (var i = 0; i < 7; i++) {
-                    index = (startIndex + (isClockwise ? - i : i )) % 8;
-                    dx = x + DIRECTION[index][0];
-                    dy = y + DIRECTION[index][1];
-                    // 找到轮廓点
-                    if (!!data[dx + dy * width] === isInContour) {
-                        x = dx;
-                        y = dy;
-                        finded = true;
-                        contour.push({
-                            x: dx,
-                            y: dy
-                        });
-                        break;
-                    }
-                }
-
-                if (!finded) {
-                    return null;
-                }
-            }
-            while (x !== startX || y !== startY);
-
-            return contour;
-        }
-
-        /**
-         * 逆时针查找轮廓边缘点
-         *
-         * @param  {Object}  imageData   图像数据
-         * @param  {Object}  startPoint  起始点
-         * @param  {boolean} isInContour 是否在轮廓内
-         *
-         * @return {Array}               找到的轮廓点集
-         */
-        function findContourAntiClockWise(imageData, startPoint, isInContour) {
-            var data = imageData.data;
-            var width = imageData.width;
-            var height = imageData.height;
-            var index = 0; // 当前方向
-            var startIndex; // 当前起始方向
-            var startX = startPoint.x;
-            var startY = startPoint.y;
-            var x = startX;
-            var y = startY;
-            var dx;
-            var dy;
-            var contour = [startPoint];
-            var finded;
-            do {
-                startIndex = index + 7 + 8;
-                finded = false;
-                for (var i = 0; i < 7; i++) {
-                    index = (startIndex + i) % 8;
+                    index = (startIndex - i) % 8;
                     dx = x + DIRECTION[index][0];
                     dy = y + DIRECTION[index][1];
                     // 找到轮廓点
                     if (!!data[dx + dy * width] === isInContour) {
+                        data[dx + dy * width] = isInContour ? 2 : 3;
                         x = dx;
                         y = dy;
                         finded = true;
@@ -133,14 +82,8 @@ define(
             var line;
             var prevLine;
             var isInContour = false;
-            var startPointArray = []; // 记录外轮廓起始节点
-            var startInCurvePointArray = []; // 记录内轮廓起始节点
-            var currentLineArray = []; // 记录当前点集合
-            var prevLineEmpty = true; // 上一行是否空行
-            var startPoint;
-            var endPoint;
-            var point;
-
+            var contours = [];
+            var contour;
 
             // 查找外轮廓坐标
             for (y = 0; y < height; y ++) {
@@ -148,93 +91,36 @@ define(
                 isInContour = false;
                 currentLineArray = [];
                 for (x = 0; x < width; x++) {
-                    // 外轮廓起始点
-                    if (!isInContour && data[line + x]) {
+                    // 查找外轮廓
+                    if (!isInContour && data[line + x] === 1) {
                         isInContour = true;
-                        currentLineArray.push({
-                            x: x,
-                            y: y,
-                            isInContour: true
-                        });
+                        if (!data[line + x - 1]) {
+                            contour = findContour(imageData, {
+                                x: x,
+                                y: y
+                            }, true);
+                            contours.push(contour);
+                        }
+
                     }
+                    // 查找内轮廓
                     else if (isInContour && !data[line + x]) {
                         isInContour = false;
-                        currentLineArray.push({
-                            x: x,
-                            y: y,
-                            isInContour: false
-                        });
-                    }
-                }
-
-                if (!currentLineArray.length) {
-                    prevLineEmpty = true;
-                }
-                else {
-
-                    // 轮廓顶部
-                    if (prevLineEmpty) {
-                        currentLineArray.forEach(function (p) {
-                            if (p.isInContour) {
-                                startPointArray.push(p);
-                            }
-                        })
-                    }
-                    else {
-                        prevLine = (y - 1) * width;
-                        for (var i = 0, l = currentLineArray.length - 1; i < l; i++) {
-                            // 在曲线内的线段，判断上一条线全为白点，则为新contour的起始点
-                            if (currentLineArray[i].isInContour) {
-                                var isAllWhite = true;
-                                for (var j = currentLineArray[i].x, je = currentLineArray[i + 1].x - 1; j < je; j++) {
-                                    if (data[prevLine + j]) {
-                                        isAllWhite = false;
-                                        break;
-                                    }
-                                }
-                                if (isAllWhite) {
-                                    startPointArray.push(currentLineArray[i]);
-                                }
-                            }
-                            else if (!currentLineArray[i].isInContour) {
-                                var isAllBlack = true;
-                                for (var j = currentLineArray[i].x, je = currentLineArray[i + 1].x - 1; j < je; j++) {
-                                    if (!data[prevLine + j]) {
-                                        isAllBlack = false;
-                                        break;
-                                    }
-                                }
-                                if (isAllBlack) {
-                                    startInCurvePointArray.push(currentLineArray[i]);
-                                }
-                            }
+                        if (data[line + x - 1] === 1) {
+                            contour = findContour(imageData, {
+                                x: x - 1,
+                                y: y
+                            }, true);
+                            contours.push(contour.reverse());
                         }
                     }
-
-                    prevLineEmpty = false;
                 }
             }
 
-            var contours = [];
-            if (!startPointArray) {
-                return contours;
-            }
-            else {
-                startPointArray.forEach(function (p) {
-                    var contour = findContour(imageData, p, true, true);
-                    if (contour) {
-                        contours.push(contour);
-                    }
-                });
-                startInCurvePointArray.forEach(function (p) {
-                    var contour = findContour(imageData, p, false, false);
-                    if (contour) {
-                        contours.push(contour);
-                    }
-                });
-            }
-
-            return contours;
+            // 这里需要过滤一些极小的轮廓
+            return contours.filter(function (contour) {
+                return contour.length > 10;
+            });
         }
 
         return findContours;
diff --git a/test/add.bmp b/test/add.bmp
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diff --git a/test/circle.bmp b/test/circle.bmp
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