feat(app): 添加图片文字识别功能

- 在 ImageHelper 中添加 recognizeText 方法，用于提取图片中的文字

src/main/ets/utils/ImageHelper.ets

@@ -1,4 +1,8 @@
 import { image } from '@kit.ImageKit';
+import { FileHelper } from './FileHelper';
+import fs from '@ohos.file.fs';
+import { BusinessError } from '@kit.BasicServicesKit';
+import { textRecognition } from '@kit.CoreVisionKit';
 
 export class ImageHelper {
   private constructor() {
@@ -102,4 +106,37 @@ export class ImageHelper {
     }
     return compressedImageData;
   }
+
+  /**
+   * 提取图片中文字
+   * @param path
+   * @returns
+   */
+  static recognizeText(path: string): Promise<textRecognition.TextRecognitionResult> {
+    return new Promise((resolve, reject) => {
+      let file = FileHelper.openSync(path, fs.OpenMode.READ_ONLY)
+      const imageSource = image.createImageSource(file.fd);
+
+      imageSource.createPixelMap().then((pixelMap) => {
+        let visionInfo: textRecognition.VisionInfo = {
+          pixelMap: pixelMap
+        };
+        let textConfiguration: textRecognition.TextRecognitionConfiguration = {
+          isDirectionDetectionSupported: false
+        };
+
+        textRecognition.recognizeText(visionInfo, textConfiguration)
+          .then((data: textRecognition.TextRecognitionResult) => {
+            resolve(data)
+          })
+          .catch((error: BusinessError) => {
+            reject(error)
+          });
+      }).catch((err: BusinessError) => {
+        reject(err)
+      });
+    });
+
+
+  }
 }