diff --git a/spec/barcode_locator.spec.js b/spec/barcode_locator.spec.js
new file mode 100644
index 0000000..a0694f4
--- /dev/null
+++ b/spec/barcode_locator.spec.js
@@ -0,0 +1,65 @@
+
+define(['barcode_locator', 'config', 'html_utils'],
+    function(BarcodeLocator, Config, HtmlUtils){
+
+    describe('checkImageConstraints', function() {
+        var config,
+            inputStream,
+            imageSize;
+
+        beforeEach(function() {
+            imageSize = {
+                x: 640, y: 480
+            };
+            config = HtmlUtils.mergeObjects({}, Config);
+            inputStream = {
+                getWidth: function() {
+                    return imageSize.x;
+                },
+                getHeight: function() {
+                    return imageSize.y;
+                },
+                setWidth: function() {},
+                setHeight: function() {}
+            };
+            sinon.stub(inputStream, "setWidth", function(width) {
+                imageSize.x = width;
+            });
+            sinon.stub(inputStream, "setHeight", function(height) {
+                imageSize.y = height;
+            });
+        });
+
+        afterEach(function() {
+            inputStream.setWidth.restore();
+            inputStream.setHeight.restore();
+        });
+
+        it('should not adjust the image-size if not needed', function() {
+            var expected = {x: imageSize.x, y: imageSize.y};
+            BarcodeLocator.checkImageConstraints(inputStream, config.locator);
+            expect(inputStream.getWidth()).to.be.equal(expected.x);
+            expect(inputStream.getHeight()).to.be.equal(expected.y);
+        });
+
+        it('should adjust the image-size', function() {
+            var expected = {x: imageSize.x, y: imageSize.y};
+
+            config.locator.halfSample = true;
+            imageSize.y += 1;
+            BarcodeLocator.checkImageConstraints(inputStream, config.locator);
+            expect(inputStream.getWidth()).to.be.equal(expected.x);
+            expect(inputStream.getHeight()).to.be.equal(expected.y);
+        });
+
+        it('should adjust the image-size', function() {
+            var expected = {x: imageSize.x, y: imageSize.y};
+
+            imageSize.y += 1;
+            config.locator.halfSample = false;
+            BarcodeLocator.checkImageConstraints(inputStream, config.locator);
+            expect(inputStream.getHeight()).to.be.equal(expected.y);
+            expect(inputStream.getWidth()).to.be.equal(expected.x);
+        });
+    });
+});
diff --git a/spec/cv_utils.spec.js b/spec/cv_utils.spec.js
index 2282b01..25a0bcb 100644
--- a/spec/cv_utils.spec.js
+++ b/spec/cv_utils.spec.js
@@ -8,4 +8,20 @@ define(['cv_utils'], function(CVUtils){
             expect(res.toVec2()[0]).to.equal(1);
         });
     });
+
+    describe('calculatePatchSize', function() {
+        it('should not throw an error in case of valid image size', function() {
+            var expected = {x: 32, y: 32},
+                patchSize = CVUtils.calculatePatchSize("medium", {x: 640, y: 480});
+
+            expect(patchSize).to.be.deep.equal(expected);
+        });
+
+        it('should thow an error if image size it not valid', function() {
+            var expected = {x: 32, y: 32},
+                patchSize = CVUtils.calculatePatchSize("medium", {x: 640, y: 480});
+
+            expect(patchSize).to.be.deep.equal(expected);
+        });
+    });
 });
diff --git a/src/barcode_locator.js b/src/barcode_locator.js
index 8d7b2bf..4b1420d 100644
--- a/src/barcode_locator.js
+++ b/src/barcode_locator.js
@@ -486,6 +486,7 @@ function(ImageWrapper, CVUtils, Rasterizer, Tracer, skeletonizer, ArrayHelper, I
             initBuffers();
             initCanvas();
         },
+
         locate : function() {
             var patchesFound,
             topLabels = [],
@@ -516,6 +517,30 @@ function(ImageWrapper, CVUtils, Rasterizer, Tracer, skeletonizer, ArrayHelper, I
 
             boxes = findBoxes(topLabels, maxLabel);
             return boxes;
+        },
+
+        checkImageConstraints: function(inputStream, config) {
+            var patchSize,
+                width = inputStream.getWidth(),
+                height = inputStream.getHeight(),
+                halfSample = config.halfSample ? 0.5 : 1,
+                size = {
+                    x: Math.floor(width * halfSample),
+                    y: Math.floor(height * halfSample)
+                };
+
+            patchSize = CVUtils.calculatePatchSize(config.patchSize, size);
+            inputStream.setWidth(Math.floor(Math.floor(size.x/patchSize.x)*(1/halfSample)*patchSize.x));
+            inputStream.setHeight(Math.floor(Math.floor(size.y/patchSize.y)*(1/halfSample)*patchSize.y));
+
+            console.log("Patch-Size: " + JSON.stringify(patchSize));
+            if ((inputStream.getWidth() % patchSize.x) === 0 && (inputStream.getHeight() % patchSize.y) === 0) {
+                return true;
+            }
+
+            throw new Error("Image dimensions do not comply with the current settings: Width (" +
+                width + " )and height (" + height +
+                ") must a multiple of " + patchSize.x);
         }
     };
 });
diff --git a/src/cv_utils.js b/src/cv_utils.js
index 12ff3d0..64eef14 100644
--- a/src/cv_utils.js
+++ b/src/cv_utils.js
@@ -647,7 +647,6 @@ define(['cluster', 'glMatrixAddon', "array_helper"], function(Cluster2, glMatrix
         optimalPatchSize = findPatchSizeForDivisors(common);
         if (!optimalPatchSize) {
             optimalPatchSize = findPatchSizeForDivisors(this._computeDivisors(wideSide));
-            throw new AdjustToSizeError("", optimalPatchSize);
         }
         return optimalPatchSize;
     };
diff --git a/src/quagga.js b/src/quagga.js
index b7ee257..d752108 100644
--- a/src/quagga.js
+++ b/src/quagga.js
@@ -14,8 +14,7 @@ define([
         "config",
         "events",
         "camera_access",
-        "image_debug",
-        "cv_utils"],
+        "image_debug"],
 function(Code128Reader,
          EANReader,
          InputStream,
@@ -27,8 +26,7 @@ function(Code128Reader,
          _config,
          Events,
          CameraAccess,
-         ImageDebug,
-         CVUtils) {
+         ImageDebug) {
     "use strict";
     
     var _inputStream,
@@ -107,39 +105,10 @@ function(Code128Reader,
         _inputStream.addEventListener("canrecord", canRecord.bind(undefined, cb));
     }
 
-    function checkImageConstraints() {
-        var patchSize,
-            width = _inputStream.getWidth(),
-            height = _inputStream.getHeight(),
-            halfSample = _config.locator.halfSample ? 0.5 : 1,
-            size = {
-                x: Math.floor(width * halfSample),
-                y: Math.floor(height * halfSample)
-            };
-
+    function canRecord(cb) {
         if (_config.locate) {
-            try {
-                console.log(size);
-                patchSize = CVUtils.calculatePatchSize(_config.locator.patchSize, size);
-            } catch (error) {
-                if (error instanceof CVUtils.AdjustToSizeError) {
-                    _inputStream.setWidth(Math.floor(Math.floor(size.x/error.patchSize.x)*(1/halfSample)*error.patchSize.x));
-                    _inputStream.setHeight(Math.floor(Math.floor(size.y/error.patchSize.y)*(1/halfSample)*error.patchSize.y));
-                    patchSize = error.patchSize;
-                }
-            }
-            console.log("Patch-Size: " + JSON.stringify(patchSize));
-            if ((_inputStream.getWidth() % patchSize.x) === 0 && (_inputStream.getHeight() % patchSize.y) === 0) {
-                return true;
-            }
+            BarcodeLocator.checkImageConstraints(_inputStream, _config.locator);
         }
-        throw new Error("Image dimensions do not comply with the current settings: Width (" +
-                            width + " )and height (" + height +
-                            ") must a multiple of " + patchSize.x);
-    }
-
-    function canRecord(cb) {
-        checkImageConstraints();
         initCanvas();
         _framegrabber = FrameGrabber.create(_inputStream, _canvasContainer.dom.image);
         initConfig();