From f8ac39c7b5d0bfdeeb7e25400f58f558d8488413 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 28 Mar 2026 08:08:51 +0000
Subject: [PATCH 1/2] Initial plan


From 860cab0de033a8627b26330a51ce8be327072d80 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Sat, 28 Mar 2026 08:36:22 +0000
Subject: [PATCH 2/2] Fix translation font size: CJK height correction and font
 size averaging

Agent-Logs-Url: https://github.com/Freeesia/WindowTranslator/sessions/3b923edd-4d46-425a-b346-5e5e81f7a59a

Co-authored-by: Freeesia <9002657+Freeesia@users.noreply.github.com>
---
 .../Modules/Ocr/OcrBufferFilter.cs            |  2 +-
 .../Modules/Ocr/WindowsMediaOcr.cs            | 25 +++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/WindowTranslator/Modules/Ocr/OcrBufferFilter.cs b/WindowTranslator/Modules/Ocr/OcrBufferFilter.cs
index ea71a6b2..5487a30d 100644
--- a/WindowTranslator/Modules/Ocr/OcrBufferFilter.cs
+++ b/WindowTranslator/Modules/Ocr/OcrBufferFilter.cs
@@ -69,7 +69,7 @@ public async IAsyncEnumerable<TextRect> ExecutePreTranslate(IAsyncEnumerable<Tex
                     Y = pastText.Y,
                     Width = Math.Max(text.Width, pastText.Width),
                     Height = pastText.Height,
-                    FontSize = pastText.FontSize
+                    FontSize = (text.FontSize + pastText.FontSize) / 2
                 };
             }
             currentTextsList.Add(text);
diff --git a/WindowTranslator/Modules/Ocr/WindowsMediaOcr.cs b/WindowTranslator/Modules/Ocr/WindowsMediaOcr.cs
index 11c47fa6..32f984e5 100644
--- a/WindowTranslator/Modules/Ocr/WindowsMediaOcr.cs
+++ b/WindowTranslator/Modules/Ocr/WindowsMediaOcr.cs
@@ -400,6 +400,13 @@ public static WordRect CorrectWord(OcrWord word, double angle, double centerX, d
         // 矩形の回転補正
         var (x, y, width, height) = RotateRect(word.BoundingRect, angle, centerX, centerY);
 
+        // CJK文字（日本語・中国語・韓国語等）はem枠をすでに満たしているため位置・高さ補正不要
+        // ラテン文字が一切含まれない場合もCJK等のフルハイト文字として扱う
+        if (ContainsCjk(word.Text) || (!isxHeight && !hasAcent && !hasHarfAcent && !hasDecent))
+        {
+            return new(word.Text, x, y, width, height);
+        }
+
         // 文字種類による位置補正
         y -= (hasAcent, hasHarfAcent) switch
         {
@@ -457,6 +464,24 @@ private static bool Contains(string text, string target)
         return te.ContainsAny(ta);
     }
 
+    /// <summary>
+    /// CJK文字（日本語・中国語・韓国語等）が含まれているかを判定する
+    /// </summary>
+    private static bool ContainsCjk(string text)
+    {
+        foreach (var c in text)
+        {
+            // 平仮名・片仮名・CJK統合漢字・ハングル音節・CJK互換漢字
+            if ((c >= '\u3040' && c <= '\u9FFF') ||
+                (c >= '\uAC00' && c <= '\uD7AF') ||
+                (c >= '\uF900' && c <= '\uFAFF'))
+            {
+                return true;
+            }
+        }
+        return false;
+    }
+
     private static bool IsAllSameChar(string text)
     {
         ReadOnlySpan<char> chars = text;