diff --git a/src/analysis.rs b/src/analysis.rs
index 9d07f81..7c5ab7b 100644
--- a/src/analysis.rs
+++ b/src/analysis.rs
@@ -14,7 +14,7 @@ use crate::{
     capture,
     config::Config,
     image_processing::{self, extract_and_filter, hash_image, Region, to_png_bytes},
-    ocr,
+    remote_ocr,
     state::{AppState, DebugOcrFrame, LapState, RaceState, SharedAppState}, learned_tracks::get_track_hash,
 };
 
@@ -159,7 +159,7 @@ fn run_loop_once(capturer: &mut Capturer, state: &SharedAppState) -> Result<()>
             locked.should_sample_ocr_data
         )
     };
-    let ocr_results = ocr::ocr_all_regions(&frame, config.clone(), ocr_cache, should_sample);
+    let ocr_results = remote_ocr::ocr_all_regions(&frame, config.clone(), ocr_cache, should_sample);
 
     if state.lock().unwrap().debug_frames {
         let debug_frames = save_frames_from(&frame, config.as_ref(), &ocr_results);
diff --git a/src/local_ocr.rs b/src/local_ocr.rs
deleted file mode 100644
index 1512cbe..0000000
--- a/src/local_ocr.rs
+++ /dev/null
@@ -1,135 +0,0 @@
-use image::{Rgb, RgbImage};
-use img_hash::{image::GenericImageView};
-
-use crate::image_processing;
-
-#[derive(Debug)]
-struct BoundingBox {
-    x: u32,
-    y: u32,
-    width: u32,
-    height: u32,
-}
-
-fn column_has_any_dark(image: &RgbImage, x: u32) -> bool {
-    for y in 0..image.height() {
-        let [r, g, b] = image.get_pixel(x, y).0;
-        if r < 100 && g < 100 && b < 100 {
-            return true;
-        }
-    }
-    false
-}
-
-fn row_has_any_dark(image: &RgbImage, y: u32, start_x: u32, width: u32) -> bool {
-    for x in start_x..(start_x + width) {
-        let [r, g, b] = image.get_pixel(x, y).0;
-        if r < 100 && g < 100 && b < 100 {
-            return true;
-        }
-    }
-    false
-}
-
-fn take_while<F: Fn(u32) -> bool>(x: &mut u32, max: u32, f: F) {
-    while *x < max && f(*x) {
-        *x += 1;
-    }
-}
-
-fn get_character_bounding_boxes(image: &RgbImage) -> Vec<BoundingBox> {
-    let mut x = 0;
-    let mut boxes = Vec::new();
-    while x < image.width() {
-        take_while(&mut x, image.width(), |x| !column_has_any_dark(image, x));
-
-        let start_x = x;
-        take_while(&mut x, image.width(), |x| column_has_any_dark(image, x));
-        let width = x - start_x;
-
-        if width >= 1 {
-            let mut y = 0;
-            take_while(&mut y, image.height(), |y| {
-                !row_has_any_dark(image, y, start_x, width)
-            });
-
-            let start_y = y;
-
-            let mut inverse_y = 0;
-            take_while(&mut inverse_y, image.height(), |y| {
-                !row_has_any_dark(image, image.height() - 1 - y, start_x, width)
-            });
-            let end_y = image.height() - inverse_y;
-            let height = end_y - start_y;
-            if height >= 1 {
-                boxes.push(BoundingBox {
-                    x: start_x,
-                    y: start_y,
-                    width,
-                    height,
-                });
-            }
-        }
-    }
-    boxes
-}
-
-fn trim_to_bounding_box(image: &RgbImage, bounding_box: &BoundingBox) -> RgbImage {
-    const PADDING: u32 = 2;
-    let mut buffer = RgbImage::from_pixel(
-        bounding_box.width + 2 * PADDING,
-        bounding_box.height + 2 * PADDING,
-        Rgb([0xFF, 0xFF, 0xFF]),
-    );
-    for y in 0..bounding_box.height {
-        for x in 0..bounding_box.width {
-            buffer.put_pixel(
-                x + PADDING,
-                y + PADDING,
-                *image.get_pixel(bounding_box.x + x, bounding_box.y + y),
-            );
-        }
-    }
-    buffer
-}
-
-pub fn bounding_box_images(image: &RgbImage) -> Vec<RgbImage> {
-    let mut trimmed = Vec::new();
-
-    let boxes = get_character_bounding_boxes(image);
-    for bounding_box in boxes {
-        trimmed.push(trim_to_bounding_box(image, &bounding_box));
-    }
-    trimmed
-}
-
-pub fn compute_box_hashes(image: &RgbImage) -> Vec<String> {
-    let mut hashes = Vec::new();
-
-    let boxes = get_character_bounding_boxes(image);
-    for bounding_box in boxes {
-        let trimmed = trim_to_bounding_box(image, &bounding_box);
-        hashes.push(image_processing::hash_image(&trimmed))
-    }
-    hashes
-}
-
-#[test]
-fn test_bounding_boxes() {
-    let image_bytes = include_bytes!("test_data/test-image-2.png");
-    let image = image::load_from_memory(image_bytes).unwrap().to_rgb8();
-    let boxes = get_character_bounding_boxes(&image);
-    assert_eq!(boxes.len(), 10);
-    assert_ne!(boxes[0].x, 0);
-    assert_ne!(boxes[0].y, 0);
-    assert_ne!(boxes[0].height, 0);
-    assert_ne!(boxes[0].width, 0);
-}
-
-#[test]
-fn test_box_hashes() {
-    let image_bytes = include_bytes!("test_data/test-image-2.png");
-    let image = image::load_from_memory(image_bytes).unwrap().to_rgb8();
-    let hashes = compute_box_hashes(&image);
-    assert_eq!(hashes.len(), 10);
-}
diff --git a/src/main.rs b/src/main.rs
index 10b701c..d193861 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,8 +4,8 @@ mod analysis;
 mod capture;
 mod config;
 mod image_processing;
-mod local_ocr;
 mod ocr;
+mod remote_ocr;
 mod state;
 mod stats_writer;
 mod training_ui;
@@ -125,9 +125,6 @@ struct DebugLap {
 struct UiState {
     config_load_err: Option<String>,
 
-    hash_to_learn: String,
-    value_to_learn: String,
-
     debug_lap: Option<DebugLap>,
 }
 
@@ -289,7 +286,7 @@ fn open_debug_lap(
 ) {
     if let Some(screenshot_bytes) = &lap.screenshot {
         let screenshot = from_png_bytes(screenshot_bytes);
-        let ocr_results = ocr::ocr_all_regions(&screenshot, config.clone(), ocr_cache, false);
+        let ocr_results = remote_ocr::ocr_all_regions(&screenshot, config.clone(), ocr_cache, false);
         let debug_lap = DebugLap {
             screenshot: RetainedImage::from_image_bytes("debug-lap", &to_png_bytes(&screenshot))
                 .unwrap(),
@@ -308,9 +305,6 @@ fn show_combo_box(ui: &mut Ui, name: &str, label: &str, options: &[String], valu
     *value = options[index].clone();
 }
 
-fn save_learned_track(_learned_tracks: &mut Arc<LearnedTracks>, _track: &str, _hash: &str) {
-}
-
 impl eframe::App for AppUi {
     fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
         let mut state = self.state.lock().unwrap();
diff --git a/src/ocr.rs b/src/ocr.rs
index 673ba35..c3bfb70 100644
--- a/src/ocr.rs
+++ b/src/ocr.rs
@@ -1,121 +1,134 @@
-use std::{
-    collections::HashMap,
-    sync::{Arc, Mutex, RwLock},
-};
+use image::{Rgb, RgbImage};
 
-use anyhow::Result;
-use image::RgbImage;
-use serde::{Deserialize, Serialize};
+use crate::image_processing;
 
-use crate::{
-    config::Config,
-    image_processing::{extract_and_filter, hash_image},
-    state::OcrCache,
-};
-
-#[derive(Serialize, Deserialize, Debug)]
-pub struct OcrRegion {
-    pub confidence: f64,
-    pub value: String,
+#[derive(Debug)]
+struct BoundingBox {
+    x: u32,
+    y: u32,
+    width: u32,
+    height: u32,
 }
 
-#[derive(Serialize, Deserialize, Debug)]
-struct OcrResult {
-    regions: Vec<OcrRegion>,
-    error: Option<String>,
-}
-
-async fn run_ocr(image: &RgbImage, url: &str) -> Result<Option<String>> {
-    let client = reqwest::Client::new();
-    let response = client
-        .post(url)
-        .body(crate::image_processing::to_png_bytes(image))
-        .send()
-        .await?;
-
-    if !response.status().is_success() {
-        eprintln!("failed to run OCR query");
-        anyhow::bail!("failed to run OCR query")
-    }
-    let result: OcrResult = response.json().await?;
-    let result = if result.regions.is_empty() {
-        None
-    } else {
-        let mut buffer = String::new();
-        for r in &result.regions {
-            buffer += &r.value;
-        }
-        Some(buffer)
-    };
-    Ok(result)
-}
-
-async fn run_ocr_cached(
-    ocr_cache: Arc<RwLock<HashMap<String, Option<String>>>>,
-    hash: String,
-    region: &crate::image_processing::Region,
-    config: Arc<Config>,
-    filtered_image: &image::ImageBuffer<image::Rgb<u8>, Vec<u8>>,
-) -> Option<String> {
-    let cached = {
-        let locked = ocr_cache.read().unwrap();
-        locked.get(&hash).cloned()
-    };
-    let use_cache = region.use_ocr_cache.unwrap_or(true) && config.use_ocr_cache.unwrap_or(true);
-    if let Some(cached) = cached {
-        if use_cache {
-            return cached;
+fn column_has_any_dark(image: &RgbImage, x: u32) -> bool {
+    for y in 0..image.height() {
+        let [r, g, b] = image.get_pixel(x, y).0;
+        if r < 100 && g < 100 && b < 100 {
+            return true;
         }
     }
-    match run_ocr(filtered_image, &config.ocr_server_endpoint).await {
-        Ok(v) => {
-            if use_cache {
-                ocr_cache.write().unwrap().insert(hash.clone(), v.clone());
+    false
+}
+
+fn row_has_any_dark(image: &RgbImage, y: u32, start_x: u32, width: u32) -> bool {
+    for x in start_x..(start_x + width) {
+        let [r, g, b] = image.get_pixel(x, y).0;
+        if r < 100 && g < 100 && b < 100 {
+            return true;
+        }
+    }
+    false
+}
+
+fn take_while<F: Fn(u32) -> bool>(x: &mut u32, max: u32, f: F) {
+    while *x < max && f(*x) {
+        *x += 1;
+    }
+}
+
+fn get_character_bounding_boxes(image: &RgbImage) -> Vec<BoundingBox> {
+    let mut x = 0;
+    let mut boxes = Vec::new();
+    while x < image.width() {
+        take_while(&mut x, image.width(), |x| !column_has_any_dark(image, x));
+
+        let start_x = x;
+        take_while(&mut x, image.width(), |x| column_has_any_dark(image, x));
+        let width = x - start_x;
+
+        if width >= 1 {
+            let mut y = 0;
+            take_while(&mut y, image.height(), |y| {
+                !row_has_any_dark(image, y, start_x, width)
+            });
+
+            let start_y = y;
+
+            let mut inverse_y = 0;
+            take_while(&mut inverse_y, image.height(), |y| {
+                !row_has_any_dark(image, image.height() - 1 - y, start_x, width)
+            });
+            let end_y = image.height() - inverse_y;
+            let height = end_y - start_y;
+            if height >= 1 {
+                boxes.push(BoundingBox {
+                    x: start_x,
+                    y: start_y,
+                    width,
+                    height,
+                });
             }
-            v
         }
-        Err(_) => None,
     }
+    boxes
 }
 
-#[tokio::main(flavor = "current_thread")]
-pub async fn ocr_all_regions(
-    image: &RgbImage,
-    config: Arc<Config>,
-    ocr_cache: Arc<OcrCache>,
-    should_sample: bool,
-) -> HashMap<String, Option<String>> {
-    let results = Arc::new(Mutex::new(HashMap::new()));
-
-    let mut handles = Vec::new();
-    for region in &config.ocr_regions {
-        let filtered_image = extract_and_filter(image, region);
-        let region = region.clone();
-        let results = results.clone();
-        let config = config.clone();
-        let ocr_cache = ocr_cache.clone();
-        handles.push(tokio::spawn(async move {
-            let filtered_image = filtered_image;
-            let hash = hash_image(&filtered_image);
-            let value =
-                run_ocr_cached(ocr_cache, hash, &region, config.clone(), &filtered_image).await;
-
-            if let Some(sample_fraction) = &config.dump_frame_fraction {
-                if rand::random::<f64>() < *sample_fraction && should_sample {
-                    let file_id = rand::random::<usize>();
-                    let img_filename = format!("ocr_data/{}.png", file_id);
-                    filtered_image.save(img_filename).unwrap();
-                    let value_filename = format!("ocr_data/{}.txt", file_id);
-                    std::fs::write(value_filename, value.clone().unwrap_or_default()).unwrap();
-                }
-            }
-            results.lock().unwrap().insert(region.name, value);
-        }));
+fn trim_to_bounding_box(image: &RgbImage, bounding_box: &BoundingBox) -> RgbImage {
+    const PADDING: u32 = 2;
+    let mut buffer = RgbImage::from_pixel(
+        bounding_box.width + 2 * PADDING,
+        bounding_box.height + 2 * PADDING,
+        Rgb([0xFF, 0xFF, 0xFF]),
+    );
+    for y in 0..bounding_box.height {
+        for x in 0..bounding_box.width {
+            buffer.put_pixel(
+                x + PADDING,
+                y + PADDING,
+                *image.get_pixel(bounding_box.x + x, bounding_box.y + y),
+            );
+        }
     }
-    for handle in handles {
-        handle.await.expect("failed to join task in OCR");
-    }
-
-    let results = results.lock().unwrap().clone();
-    results
+    buffer
+}
+
+pub fn bounding_box_images(image: &RgbImage) -> Vec<RgbImage> {
+    let mut trimmed = Vec::new();
+
+    let boxes = get_character_bounding_boxes(image);
+    for bounding_box in boxes {
+        trimmed.push(trim_to_bounding_box(image, &bounding_box));
+    }
+    trimmed
+}
+
+pub fn compute_box_hashes(image: &RgbImage) -> Vec<String> {
+    let mut hashes = Vec::new();
+
+    let boxes = get_character_bounding_boxes(image);
+    for bounding_box in boxes {
+        let trimmed = trim_to_bounding_box(image, &bounding_box);
+        hashes.push(image_processing::hash_image(&trimmed))
+    }
+    hashes
+}
+
+#[test]
+fn test_bounding_boxes() {
+    let image_bytes = include_bytes!("test_data/test-image-2.png");
+    let image = image::load_from_memory(image_bytes).unwrap().to_rgb8();
+    let boxes = get_character_bounding_boxes(&image);
+    assert_eq!(boxes.len(), 10);
+    assert_ne!(boxes[0].x, 0);
+    assert_ne!(boxes[0].y, 0);
+    assert_ne!(boxes[0].height, 0);
+    assert_ne!(boxes[0].width, 0);
+}
+
+#[test]
+fn test_box_hashes() {
+    let image_bytes = include_bytes!("test_data/test-image-2.png");
+    let image = image::load_from_memory(image_bytes).unwrap().to_rgb8();
+    let hashes = compute_box_hashes(&image);
+    assert_eq!(hashes.len(), 10);
 }
diff --git a/src/remote_ocr.rs b/src/remote_ocr.rs
new file mode 100644
index 0000000..673ba35
--- /dev/null
+++ b/src/remote_ocr.rs
@@ -0,0 +1,121 @@
+use std::{
+    collections::HashMap,
+    sync::{Arc, Mutex, RwLock},
+};
+
+use anyhow::Result;
+use image::RgbImage;
+use serde::{Deserialize, Serialize};
+
+use crate::{
+    config::Config,
+    image_processing::{extract_and_filter, hash_image},
+    state::OcrCache,
+};
+
+#[derive(Serialize, Deserialize, Debug)]
+pub struct OcrRegion {
+    pub confidence: f64,
+    pub value: String,
+}
+
+#[derive(Serialize, Deserialize, Debug)]
+struct OcrResult {
+    regions: Vec<OcrRegion>,
+    error: Option<String>,
+}
+
+async fn run_ocr(image: &RgbImage, url: &str) -> Result<Option<String>> {
+    let client = reqwest::Client::new();
+    let response = client
+        .post(url)
+        .body(crate::image_processing::to_png_bytes(image))
+        .send()
+        .await?;
+
+    if !response.status().is_success() {
+        eprintln!("failed to run OCR query");
+        anyhow::bail!("failed to run OCR query")
+    }
+    let result: OcrResult = response.json().await?;
+    let result = if result.regions.is_empty() {
+        None
+    } else {
+        let mut buffer = String::new();
+        for r in &result.regions {
+            buffer += &r.value;
+        }
+        Some(buffer)
+    };
+    Ok(result)
+}
+
+async fn run_ocr_cached(
+    ocr_cache: Arc<RwLock<HashMap<String, Option<String>>>>,
+    hash: String,
+    region: &crate::image_processing::Region,
+    config: Arc<Config>,
+    filtered_image: &image::ImageBuffer<image::Rgb<u8>, Vec<u8>>,
+) -> Option<String> {
+    let cached = {
+        let locked = ocr_cache.read().unwrap();
+        locked.get(&hash).cloned()
+    };
+    let use_cache = region.use_ocr_cache.unwrap_or(true) && config.use_ocr_cache.unwrap_or(true);
+    if let Some(cached) = cached {
+        if use_cache {
+            return cached;
+        }
+    }
+    match run_ocr(filtered_image, &config.ocr_server_endpoint).await {
+        Ok(v) => {
+            if use_cache {
+                ocr_cache.write().unwrap().insert(hash.clone(), v.clone());
+            }
+            v
+        }
+        Err(_) => None,
+    }
+}
+
+#[tokio::main(flavor = "current_thread")]
+pub async fn ocr_all_regions(
+    image: &RgbImage,
+    config: Arc<Config>,
+    ocr_cache: Arc<OcrCache>,
+    should_sample: bool,
+) -> HashMap<String, Option<String>> {
+    let results = Arc::new(Mutex::new(HashMap::new()));
+
+    let mut handles = Vec::new();
+    for region in &config.ocr_regions {
+        let filtered_image = extract_and_filter(image, region);
+        let region = region.clone();
+        let results = results.clone();
+        let config = config.clone();
+        let ocr_cache = ocr_cache.clone();
+        handles.push(tokio::spawn(async move {
+            let filtered_image = filtered_image;
+            let hash = hash_image(&filtered_image);
+            let value =
+                run_ocr_cached(ocr_cache, hash, &region, config.clone(), &filtered_image).await;
+
+            if let Some(sample_fraction) = &config.dump_frame_fraction {
+                if rand::random::<f64>() < *sample_fraction && should_sample {
+                    let file_id = rand::random::<usize>();
+                    let img_filename = format!("ocr_data/{}.png", file_id);
+                    filtered_image.save(img_filename).unwrap();
+                    let value_filename = format!("ocr_data/{}.txt", file_id);
+                    std::fs::write(value_filename, value.clone().unwrap_or_default()).unwrap();
+                }
+            }
+            results.lock().unwrap().insert(region.name, value);
+        }));
+    }
+    for handle in handles {
+        handle.await.expect("failed to join task in OCR");
+    }
+
+    let results = results.lock().unwrap().clone();
+    results
+}
diff --git a/src/state.rs b/src/state.rs
index fbb49c4..a70122c 100644
--- a/src/state.rs
+++ b/src/state.rs
@@ -66,13 +66,11 @@ impl LapState {
 fn median_wear(values: Vec<Option<usize>>) -> Option<usize> {
     let mut wear_values = Vec::new();
     let mut last_value = 100;
-    for val in values {
-        if let Some(val) = val {
-            if val < last_value {
-                wear_values.push(last_value - val);
-            }
-            last_value = val;
+    for val in values.into_iter().flatten() {
+        if val < last_value {
+            wear_values.push(last_value - val);
         }
+        last_value = val;
     }
     wear_values.sort_unstable();
     wear_values.get(wear_values.len() / 2).cloned()
diff --git a/src/training_ui.rs b/src/training_ui.rs
index 3cc7cf6..ab23915 100644
--- a/src/training_ui.rs
+++ b/src/training_ui.rs
@@ -10,7 +10,7 @@ use eframe::{
 use egui_extras::RetainedImage;
 use image::RgbImage;
 
-use crate::{image_processing::to_png_bytes, local_ocr};
+use crate::{image_processing::to_png_bytes, ocr};
 
 #[derive(Default)]
 struct TrainingUi {
@@ -24,7 +24,6 @@ struct TrainingUi {
 struct TrainingImage {
     img_file: PathBuf,
     data_file: PathBuf,
-    image: RgbImage,
     text: String,
 
     ui_image: RetainedImage,
@@ -74,15 +73,14 @@ fn get_training_data() -> Vec<TrainingImage> {
         let ocr_value = String::from_utf8(std::fs::read(&ocr_file).unwrap()).unwrap();
         let ui_image = load_retained_image(&image);
 
-        let char_images = local_ocr::bounding_box_images(&image)
+        let char_images = ocr::bounding_box_images(&image)
             .iter()
             .map(load_retained_image)
             .collect();
-        let char_hashes = local_ocr::compute_box_hashes(&image);
+        let char_hashes = ocr::compute_box_hashes(&image);
         data.push(TrainingImage {
             img_file,
             data_file: ocr_file,
-            image,
             text: ocr_value,
             ui_image,
             char_images,
@@ -170,7 +168,7 @@ impl eframe::App for TrainingUi {
                         .write(true)
                         .open("learned_chars.txt")
                         .unwrap();
-                    file.write(buffer.as_bytes()).unwrap();
+                    file.write_all(buffer.as_bytes()).unwrap();
                 }
 
                 current_image.ui_image.show(ui);