diff --git a/src/qrcode/detector/detector.rs b/src/qrcode/detector/detector.rs
index a711b3e..99f5882 100644
--- a/src/qrcode/detector/detector.rs
+++ b/src/qrcode/detector/detector.rs
@@ -344,7 +344,7 @@ impl Detector {
             scale = (self.image.getWidth() as i32 - 1 - fromX as i32) as f32 / (otherToX - fromX as i32) as f32;
             otherToX = self.image.getWidth() as i32 - 1;
         }
-        let mut otherToY = fromY as i32 - (toY as i32 - fromY as i32) * scale.floor() as i32;
+        let mut otherToY = (fromY as f32 - (toY as f32 - fromY as f32) * scale).floor() as i32;
 
         scale = 1.0;
         if otherToY < 0 {
@@ -354,7 +354,7 @@ impl Detector {
             scale = (self.image.getHeight() as i32 - 1 - fromY as i32) as f32 / (otherToY - fromY as i32) as f32;
             otherToY = self.image.getHeight() as i32 - 1;
         }
-        otherToX = fromX as i32+ (otherToX - fromX as i32) * scale.floor() as i32;
+        otherToX = (fromX as f32+ (otherToX as f32 - fromX as f32) * scale).floor() as i32;
 
         result += self.sizeOfBlackWhiteBlackRun(fromX as u32, fromY as u32, otherToX as u32, otherToY as u32);
 
diff --git a/src/qrcode/detector/finder_pattern_finder.rs b/src/qrcode/detector/finder_pattern_finder.rs
index 0f9fc5e..27509c3 100755
--- a/src/qrcode/detector/finder_pattern_finder.rs
+++ b/src/qrcode/detector/finder_pattern_finder.rs
@@ -622,7 +622,7 @@ impl FinderPatternFinder {
                     // This is the case where you find top left last.
                     self.hasSkipped = true;
                     let fnp = firstConfirmedCenter.unwrap();
-                    return (((fnp.getX() - center.getX().abs())
+                    return (((fnp.getX() - center.getX()).abs()
                         - (fnp.getY() - center.getY()).abs())
                         / 2.0)
                         .floor() as u32;
diff --git a/tests/QRCodeBlackBox3TestCase.rs b/tests/QRCodeBlackBox3TestCase.rs
index ddf9d9e..7406fb1 100644
--- a/tests/QRCodeBlackBox3TestCase.rs
+++ b/tests/QRCodeBlackBox3TestCase.rs
@@ -33,3 +33,5 @@ fn QRCodeBlackBox3TestCase() {
   tester.testBlackBox();
   }
 
+// 11 - 90
+// 13 - 90