[TextExtractor] Add space between CJK words and non-CJK (#20926)

* [TextExtractor] add space between CJK words and non-CJK

src/modules/PowerOCR/PowerOCR/Helpers/ImageMethods.cs

@@ -10,6 +10,7 @@ using System.Globalization;
 using System.IO;
 using System.Linq;
 using System.Text;
+using System.Text.RegularExpressions;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Input;
@@ -146,11 +147,25 @@ internal class ImageMethods
                 }
                 else
                 {
+                    var cjkRegex = new Regex(@"\p{IsCJKUnifiedIdeographs}");
+
                     foreach (OcrLine ocrLine in ocrResult.Lines)
                     {
+                        bool isBeginning = true;
+                        bool isCJKPrev = false;
                         foreach (OcrWord ocrWord in ocrLine.Words)
                         {
+                            bool isCJK = cjkRegex.IsMatch(ocrWord.Text);
+
+                            // Use spaces to separate non-CJK words.
+                            if (!isBeginning && (!isCJK || !isCJKPrev))
+                            {
+                                _ = text.Append(' ');
+                            }
+
                             _ = text.Append(ocrWord.Text);
+                            isCJKPrev = isCJK;
+                            isBeginning = false;
                         }
 
                         text.Append(Environment.NewLine);