diff --git a/plugins/ai_shoe_det/ai_shoe_det_node.cpp b/plugins/ai_shoe_det/ai_shoe_det_node.cpp
index ef21a5c..4f6da70 100644
--- a/plugins/ai_shoe_det/ai_shoe_det_node.cpp
+++ b/plugins/ai_shoe_det/ai_shoe_det_node.cpp
@@ -561,13 +561,8 @@ private:
 
         if (!src || src_stride <= 0) return dets;
 
-        // 裁剪到临时缓冲区
-        std::vector<uint8_t> crop_buf(static_cast<size_t>(win_w) * win_h * 3);
-        for (int row = 0; row < win_h; ++row) {
-            const uint8_t* src_row = src + (win_y + row) * src_stride + win_x * 3;
-            uint8_t* dst_row = crop_buf.data() + row * win_w * 3;
-            memcpy(dst_row, src_row, static_cast<size_t>(win_w) * 3);
-        }
+        const uint8_t* roi_src = src + static_cast<size_t>(win_y) * static_cast<size_t>(src_stride) +
+                                 static_cast<size_t>(win_x) * 3;
 
         const uint8_t* model_input_data = nullptr;
         size_t model_input_size = 0;
@@ -579,11 +574,11 @@ private:
             crop_frame.width = win_w;
             crop_frame.height = win_h;
             crop_frame.format = PixelFormat::RGB;
-            crop_frame.stride = win_w * 3;
-            crop_frame.data = crop_buf.data();
-            crop_frame.data_size = crop_buf.size();
+            crop_frame.stride = src_stride;
+            crop_frame.data = const_cast<uint8_t*>(roi_src);
+            crop_frame.data_size = frame->data_size;
             crop_frame.plane_count = 1;
-            crop_frame.planes[0] = {crop_buf.data(), crop_frame.stride, static_cast<int>(crop_buf.size()), 0};
+            crop_frame.planes[0] = {crop_frame.data, crop_frame.stride, static_cast<int>(frame->data_size), 0};
 
             resized_frame.width = model_w_;
             resized_frame.height = model_h_;
@@ -614,7 +609,7 @@ private:
         }
 
         if (!model_input_data) {
-            ResizeRgbBilinear(crop_buf.data(), win_w, win_h, win_w * 3,
+            ResizeRgbBilinear(roi_src, win_w, win_h, src_stride,
                               input_buf_.data(), model_w_, model_h_, model_w_ * 3);
             model_input_data = input_buf_.data();
             model_input_size = input_buf_.size();