fix: fix multiple image duplicate loading issues

- detect.py: detect_and_draw()中传给detect()的是已加载的img数组而非字符串路径
- usage_example.py: example3中复用gray_img数组而非重新加载
- analyze_temp_features.py: 复用已加载的gray_img数组进行检测

scripts/analyze_temp_features.py

@@ -64,8 +64,8 @@ def analyze_validation_set(
             # 加载灰度图像（用于温度提取）
             gray_img = load_infrared_image(str(img_path))
 
-            # 进行检测
-            detections = detector.detect(str(img_path), conf=conf)
+            # 进行检测（复用已加载的图像）
+            detections = detector.detect(gray_img, conf=conf)
 
             for det in detections:
                 bbox = det['bbox']

scripts/usage_example.py

@@ -54,8 +54,8 @@ def example3_temperature_extraction():
     # 读取图像
     gray_img = cv2.imread(SAMPLE_IMAGE, cv2.IMREAD_GRAYSCALE)
 
-    # 检测目标
-    detections = detector.detect(SAMPLE_IMAGE)
+    # 检测目标（复用已加载的图像）
+    detections = detector.detect(gray_img)
 
     # 提取第一个检测框的温度特征
     if detections:

src/detect.py

@@ -92,7 +92,7 @@ class InfraredDetector:
         else:
             img = image.copy()
 
-        detections = self.detect(image, conf)
+        detections = self.detect(img, conf)
 
         for det in detections:
             x1, y1, x2, y2 = map(int, det['bbox'])