Add ANSALPR country format

tests/ANSLPR-UnitTest/ANSLPR-UnitTest.cpp

@@ -3953,9 +3953,14 @@ int ALPR_OCR_VideoTest() {
         return -1;
     }
 
-    // Step 2: Set country (JAPAN = 5 — adjust to match the dataset if needed)
-    ANSALPR_SetCountry(&infHandle, 1);
-    std::cout << "Country set to JAPAN" << std::endl;
+    // Step 2: Set country (VIETNAM = 0 — adjust to match the dataset if needed).
+    // Country codes match country.txt parsing in ANSALPR_OCR::Initialize:
+    //   0 = VIETNAM, 1 = CHINA, 2 = AUSTRALIA, 3 = USA, 4 = INDONESIA, 5 = JAPAN.
+    // Setting VIETNAM here also activates ANSALPR_OCR's Vietnam-only
+    // post-processing (alnum filter + uppercase + plate-format validation
+    // against the 11 standard Vietnam patterns).
+    ANSALPR_SetCountry(&infHandle, 0);
+    std::cout << "Country set to VIETNAM" << std::endl;
 
     // Step 3: Load engine
     auto engineStart = std::chrono::high_resolution_clock::now();