diff --git a/cpp-package/inspireface/cpp/inspireface/track_module/face_detect/face_detect_adapt.cpp b/cpp-package/inspireface/cpp/inspireface/track_module/face_detect/face_detect_adapt.cpp
index 18b618a..793bf1b 100644
--- a/cpp-package/inspireface/cpp/inspireface/track_module/face_detect/face_detect_adapt.cpp
+++ b/cpp-package/inspireface/cpp/inspireface/track_module/face_detect/face_detect_adapt.cpp
@@ -22,7 +22,12 @@ FaceLocList FaceDetectAdapt::operator()(const inspirecv::Image &bgr) {
     inspirecv::Image pad;
 
     uint8_t *resized_data = nullptr;
-    m_processor_->ResizeAndPadding(bgr.Data(), bgr.Width(), bgr.Height(), bgr.Channels(), m_input_size_, m_input_size_, &resized_data, scale);
+    if (ori_w == m_input_size_ && ori_h == m_input_size_) {
+        scale = 1.0f;
+        resized_data = (uint8_t *)bgr.Data();
+    } else {
+        m_processor_->ResizeAndPadding(bgr.Data(), bgr.Width(), bgr.Height(), bgr.Channels(), m_input_size_, m_input_size_, &resized_data, scale);
+    }
 
     pad = inspirecv::Image::Create(m_input_size_, m_input_size_, bgr.Channels(), resized_data, false);
 
diff --git a/cpp-package/inspireface/cpp/sample/api/sample_face_track.c b/cpp-package/inspireface/cpp/sample/api/sample_face_track.c
index 06258ec..dfde115 100644
--- a/cpp-package/inspireface/cpp/sample/api/sample_face_track.c
+++ b/cpp-package/inspireface/cpp/sample/api/sample_face_track.c
@@ -98,7 +98,7 @@ int main(int argc, char* argv[]) {
     /* Maximum number of faces detected */
     maxDetectNum = 20;
     /* Face detection image input level */
-    detectPixelLevel = 160;
+    detectPixelLevel = 320;
     /* Handle of the current face SDK algorithm context */
     session = NULL;
     ret = HFCreateInspireFaceSessionOptional(option, detMode, maxDetectNum, detectPixelLevel, -1, &session);