Dataset: add READMEs, organize scripts, update .gitignore

- Add README.md to all 16 dataset directories with script references
- Centralize generation scripts under scripts/ with full README
- Update .gitignore to cover all data directories, keep only metadata
- Remove redundant CCPD/.gitignore (parent covers same rules)
- Remove stale scripts/test/ (254MB pipeline residue)
- Fix label parser reference: scripts are authoritative source of truth

CCPD_SPE_GEN/cpp_pipeline/plate_swap.cpp

@@ -184,6 +184,8 @@ static string bg_color_of(const string& plate_type) {
     if (plate_type == "lingguan_old" || plate_type == "lingguan_new") return "black";
     if (plate_type == "coach") return "yellow";
     if (plate_type == "new_energy") return "green_truck";
+    if (plate_type == "blue") return "blue";
+    if (plate_type == "green") return "green_car";
     return "white";
 }
 
@@ -322,7 +324,7 @@ Mat match_plate_color(const Mat& synthetic, const Mat& orig_roi,
 
     // 白/绿牌
     Scalar color_cast(white_ref[0]/ref_mean, white_ref[1]/ref_mean, white_ref[2]/ref_mean);
-    float strength = (bg_color == "green_truck") ? 1.5f : 1.0f;
+    float strength = (bg_color == "green_truck" || bg_color == "green_car") ? 1.5f : 1.0f;
     Scalar amplified(1.0f + (color_cast[0]-1.0f)*strength, 1.0f+(color_cast[1]-1.0f)*strength, 1.0f+(color_cast[2]-1.0f)*strength);
     amplified[0] = std::clamp((float)amplified[0], 0.85f, 1.15f);
     amplified[1] = std::clamp((float)amplified[1], 0.85f, 1.15f);
@@ -359,7 +361,8 @@ Mat fix_bg_color(const Mat& plate, const string& bg_color,
 
     int h_lo = 0, h_hi = 180;
     if (bg_color == "yellow") { h_lo = 15; h_hi = 50; }
-    else if (bg_color == "green_truck") { h_lo = 40; h_hi = 85; }
+    else if (bg_color == "green_truck" || bg_color == "green_car") { h_lo = 40; h_hi = 85; }
+    else if (bg_color == "blue") { h_lo = 90; h_hi = 130; }
 
     Mat hsv;
     cvtColor(plate, hsv, COLOR_BGR2HSV);
@@ -629,7 +632,7 @@ bool process_single(const string& img_path, const SwapConfig& cfg,
     if (current_w > 10 && abs(target_w - current_w) > 10) {
         float l_ratio = target_w / current_w;
         float min_c = 0.5f, max_c = 1.1f;
-        if (bg_color == "green_truck" || bg_color == "yellow") { min_c = 0.4f; max_c = 1.0f; }
+        if (bg_color == "green_truck" || bg_color == "green_car" || bg_color == "yellow") { min_c = 0.4f; max_c = 1.0f; }
         else if (bg_color == "black" || bg_color == "black_shi") { min_c = 0.3f; max_c = 1.2f; }
         l_ratio = std::clamp(l_ratio, min_c, max_c);
 
@@ -650,38 +653,16 @@ bool process_single(const string& img_path, const SwapConfig& cfg,
     }
 
     // 8. Degradation
-    if (!cfg.fast_mode)
-        matched = degrade_plate(matched);
+    matched = degrade_plate(matched);
 
     // 9-11. Warp + blend + noise
     auto [warped, mask] = warp_plate_back(matched, meta.corners, Size(w_img, h_img));
     Mat blended = feather_blend(img_orig, warped, mask);
     Mat final = match_noise(blended, img_orig, mask);
 
-    // 12. Save with pinyin tags
+    // 12. Save with original Chinese plate number (imwrite_unicode supports UTF-8)
     string stem = fp.stem().string();
-    // Convert Chinese plate markers to ASCII tags
-    string tag = plate_number;
-    // Manual pinyin mapping for common plate characters (UTF-8 byte sequences)
-    // 港=E6B8AF 澳=E6BEB3 警=E8ADA6 使=E4BDBF 领=E9A286 学=E5ADA6
-    struct { const char* utf8; const char* py; } map[] = {
-        {"\xE6\xB8\xAF", "GANG"}, {"\xE6\xBE\xB3", "AO"},
-        {"\xE8\xAD\xA6", "JING"}, {"\xE4\xBD\xBF", "SHI"},
-        {"\xE9\xA2\x86", "LING"}, {"\xE5\xAD\xA6", "XUE"},
-    };
-    for (auto& m : map) {
-        size_t pos = 0;
-        while ((pos = tag.find(m.utf8, pos)) != string::npos) {
-            tag.replace(pos, 3, m.py);
-            pos += strlen(m.py);
-        }
-    }
-    // Remove any remaining non-ASCII
-    string clean;
-    for (char c : tag) {
-        if ((unsigned char)c < 128) clean += c;
-    }
-    string out_name = stem + "__" + cfg.plate_type + "__" + clean + ".jpg";
+    string out_name = stem + "__" + cfg.plate_type + "__" + plate_number + ".jpg";
     string ccpd_subdir = fp.parent_path().filename().string();
     fs::path out_dir = fs::path(cfg.output_dir) / ccpd_subdir / cfg.plate_type;
     fs::create_directories(out_dir);