diff --git a/src/common/otsu_level_binarizer.rs b/src/common/otsu_level_binarizer.rs
index cd2de5f..a51c690 100644
--- a/src/common/otsu_level_binarizer.rs
+++ b/src/common/otsu_level_binarizer.rs
@@ -1,4 +1,4 @@
-use std::{borrow::Cow, rc::Rc};
+use std::borrow::Cow;
 
 use image::{DynamicImage, ImageBuffer, Luma};
 use once_cell::sync::OnceCell;
@@ -8,16 +8,16 @@ use crate::{Binarizer, Exceptions, LuminanceSource};
 
 use super::{BitArray, BitMatrix};
 
-pub struct OtsuLevelBinarizer {
+pub struct OtsuLevelBinarizer<LS: LuminanceSource> {
     width: usize,
     height: usize,
-    source: Box<dyn LuminanceSource>,
+    source: LS,
     black_matrix: OnceCell<BitMatrix>,
     black_row_cache: Vec<OnceCell<BitArray>>,
 }
 
-impl OtsuLevelBinarizer {
-    fn generate_threshold_matrix(source: &dyn LuminanceSource) -> Result<BitMatrix> {
+impl<LS: LuminanceSource> OtsuLevelBinarizer<LS> {
+    fn generate_threshold_matrix<LS2: LuminanceSource>(source: &LS2) -> Result<BitMatrix> {
         let image_buffer = {
             let Some(buff) : Option<ImageBuffer<Luma<u8>,Vec<u8>>> = ImageBuffer::from_vec(source.get_width() as u32, source.get_height() as u32, source.get_matrix()) else {
                 return Err(Exceptions::ILLEGAL_ARGUMENT)
@@ -34,7 +34,7 @@ impl OtsuLevelBinarizer {
         dynamic_filtered.try_into()
     }
 
-    pub fn new(source: Box<dyn LuminanceSource>) -> Self {
+    pub fn new(source: LS) -> Self {
         Self {
             width: source.get_width(),
             height: source.get_height(),
@@ -45,12 +45,14 @@ impl OtsuLevelBinarizer {
     }
 }
 
-impl Binarizer for OtsuLevelBinarizer {
-    fn get_luminance_source(&self) -> &Box<dyn crate::LuminanceSource> {
+impl<LS: LuminanceSource> Binarizer for OtsuLevelBinarizer<LS> {
+    type Source = LS;
+
+    fn get_luminance_source(&self) -> &LS {
         &self.source
     }
 
-    fn get_black_row(&self, y: usize) -> Result<std::borrow::Cow<super::BitArray>> {
+    fn get_black_row(&self, y: usize) -> Result<Cow<BitArray>> {
         let row = self.black_row_cache[y].get_or_try_init(|| {
             let matrix = self.get_black_matrix()?;
             Ok(matrix.getRow(y as u32))
@@ -59,18 +61,15 @@ impl Binarizer for OtsuLevelBinarizer {
         Ok(Cow::Borrowed(row))
     }
 
-    fn get_black_matrix(&self) -> Result<&super::BitMatrix> {
+    fn get_black_matrix(&self) -> Result<&BitMatrix> {
         let matrix = self
             .black_matrix
-            .get_or_try_init(|| Self::generate_threshold_matrix(self.source.as_ref()))?;
+            .get_or_try_init(|| Self::generate_threshold_matrix(&self.source))?;
         Ok(matrix)
     }
 
-    fn create_binarizer(
-        &self,
-        source: Box<dyn crate::LuminanceSource>,
-    ) -> std::rc::Rc<dyn Binarizer> {
-        Rc::new(Self::new(source))
+    fn create_binarizer(&self, source: LS) -> Self {
+        Self::new(source)
     }
 
     fn get_width(&self) -> usize {
diff --git a/src/helpers.rs b/src/helpers.rs
index 5559bbf..71f3e85 100644
--- a/src/helpers.rs
+++ b/src/helpers.rs
@@ -57,9 +57,7 @@ pub fn detect_in_svg_with_hints(
         .or_insert(DecodeHintValue::TryHarder(true));
 
     multi_format_reader.decode_with_hints(
-        &mut BinaryBitmap::new(Rc::new(HybridBinarizer::new(Box::new(
-            SVGLuminanceSource::new(&svg_data)?,
-        )))),
+        &mut BinaryBitmap::new(HybridBinarizer::new(SVGLuminanceSource::new(&svg_data)?)),
         hints,
     )
 }
@@ -100,9 +98,7 @@ pub fn detect_multiple_in_svg_with_hints(
         .or_insert(DecodeHintValue::TryHarder(true));
 
     scanner.decode_multiple_with_hints(
-        &mut BinaryBitmap::new(Rc::new(HybridBinarizer::new(Box::new(
-            SVGLuminanceSource::new(&svg_data)?,
-        )))),
+        &mut BinaryBitmap::new(HybridBinarizer::new(SVGLuminanceSource::new(&svg_data)?)),
         hints,
     )
 }
diff --git a/src/qrcode/decoder/decoded_bit_stream_parser.rs b/src/qrcode/decoder/decoded_bit_stream_parser.rs
index 4d6451e..bf97309 100644
--- a/src/qrcode/decoder/decoded_bit_stream_parser.rs
+++ b/src/qrcode/decoder/decoded_bit_stream_parser.rs
@@ -310,7 +310,7 @@ fn decodeByteSegment(
         {
             encoding::all::ISO_8859_1
         } else {
-            StringUtils::guessCharset(&readBytes, hints)
+            StringUtils::guessCharset(&readBytes, hints).ok_or(Exceptions::ILLEGAL_STATE)?
         }
     } else {
         CharacterSetECI::getCharset(
diff --git a/src/svg_luminance_source.rs b/src/svg_luminance_source.rs
index 2a367a1..fda0196 100644
--- a/src/svg_luminance_source.rs
+++ b/src/svg_luminance_source.rs
@@ -22,34 +22,28 @@ impl LuminanceSource for SVGLuminanceSource {
         self.0.get_height()
     }
 
-    fn invert(&mut self) {
-        self.0.invert()
-    }
-
     fn is_crop_supported(&self) -> bool {
         self.0.is_crop_supported()
     }
 
-    fn crop(
-        &self,
-        left: usize,
-        top: usize,
-        width: usize,
-        height: usize,
-    ) -> Result<Box<dyn LuminanceSource>> {
-        self.0.crop(left, top, width, height)
+    fn crop(&self, left: usize, top: usize, width: usize, height: usize) -> Result<Self> {
+        self.0.crop(left, top, width, height).map(|src| Self(src))
     }
 
     fn is_rotate_supported(&self) -> bool {
         self.0.is_rotate_supported()
     }
 
-    fn rotate_counter_clockwise(&self) -> Result<Box<dyn LuminanceSource>> {
-        self.0.rotate_counter_clockwise()
+    fn invert(&mut self) {
+        self.0.invert()
     }
 
-    fn rotate_counter_clockwise_45(&self) -> Result<Box<dyn LuminanceSource>> {
-        self.0.rotate_counter_clockwise_45()
+    fn rotate_counter_clockwise(&self) -> Result<Self> {
+        self.0.rotate_counter_clockwise().map(|src| Self(src))
+    }
+
+    fn rotate_counter_clockwise_45(&self) -> Result<Self> {
+        self.0.rotate_counter_clockwise_45().map(|src| Self(src))
     }
 }