diff --git a/APP_Framework/Applications/knowing_app/face_detect/face_detect.c b/APP_Framework/Applications/knowing_app/face_detect/face_detect.c
index dc9c6568..6eca1091 100644
--- a/APP_Framework/Applications/knowing_app/face_detect/face_detect.c
+++ b/APP_Framework/Applications/knowing_app/face_detect/face_detect.c
@@ -182,6 +182,8 @@ void face_detect()
         printf("open ov2640 fail !!");
         return;
     }
+    _ioctl_set_dvp_reso set_dvp_reso = {sensor_output_size[1], sensor_output_size[0]};
+    ioctl(g_fd, IOCTRL_CAMERA_SET_DVP_RESO, &set_dvp_reso);
     showbuffer = (unsigned char *)malloc(sensor_output_size[0] * sensor_output_size[1] * 2);
     if (NULL == showbuffer) {
         close(g_fd);
diff --git a/APP_Framework/Applications/knowing_app/helmet_detect/README.md b/APP_Framework/Applications/knowing_app/helmet_detect/README.md
index 006427ed..36029e9f 100644
--- a/APP_Framework/Applications/knowing_app/helmet_detect/README.md
+++ b/APP_Framework/Applications/knowing_app/helmet_detect/README.md
@@ -144,7 +144,7 @@ Copy json config for deployment o SD card */kmodel*. Example config file is *hel
 
 - net_input_size: same as *input_size* in training config file, but array only.
 - net_output_shape: final feature map size, can be found in **nncase** output.
-- sensor_output_size: image height and width from camera, same as *dvp_set_image_size(Ubiquitous/RT_Thread/bsp/k210/base-drivers/drv_dvp.c L70(71))*.
+- sensor_output_size: image height and width from camera.
 - kmodel_size: kmodel size shown in file system.
 - anchors: same as *anchor* in training config file(multi-dimention anchors flatten to 1 dim).
 - labels: same as *label* in training config file.
diff --git a/APP_Framework/Applications/knowing_app/helmet_detect/helmet_detect.c b/APP_Framework/Applications/knowing_app/helmet_detect/helmet_detect.c
index 3ea8e2dd..5fff6411 100644
--- a/APP_Framework/Applications/knowing_app/helmet_detect/helmet_detect.c
+++ b/APP_Framework/Applications/knowing_app/helmet_detect/helmet_detect.c
@@ -182,6 +182,8 @@ void helmet_detect()
         printf("open ov2640 fail !!");
         return;
     }
+    _ioctl_set_dvp_reso set_dvp_reso = {sensor_output_size[1], sensor_output_size[0]};
+    ioctl(g_fd, IOCTRL_CAMERA_SET_DVP_RESO, &set_dvp_reso);
     showbuffer = (unsigned char *)malloc(sensor_output_size[0] * sensor_output_size[1] * 2);
     if (NULL == showbuffer) {
         close(g_fd);
diff --git a/APP_Framework/Applications/knowing_app/instrusion_detect/instrusion_detect.c b/APP_Framework/Applications/knowing_app/instrusion_detect/instrusion_detect.c
index 62929d0a..c5ac9ee3 100644
--- a/APP_Framework/Applications/knowing_app/instrusion_detect/instrusion_detect.c
+++ b/APP_Framework/Applications/knowing_app/instrusion_detect/instrusion_detect.c
@@ -182,6 +182,8 @@ void instrusion_detect()
         printf("open ov2640 fail !!");
         return;
     }
+    _ioctl_set_dvp_reso set_dvp_reso = {sensor_output_size[1], sensor_output_size[0]};
+    ioctl(g_fd, IOCTRL_CAMERA_SET_DVP_RESO, &set_dvp_reso);
     showbuffer = (unsigned char *)malloc(sensor_output_size[0] * sensor_output_size[1] * 2);
     if (NULL == showbuffer) {
         close(g_fd);