#?MIT?License
#?Copyright?（c）?2019?JetsonHacks
#?See?LICENSE?for?OpenCV?license?and?additional?information

#?https://docs.opencv.org/3.3.1/d7/d8b/tutorial_py_face_detection.html
#?On?the?Jetson?Nano?OpenCV?comes?preinstalled
#?Data?files?are?in?/usr/sharc/OpenCV
import?numpy?as?np
import?cv2

#?gstreamer_pipeline?returns?a?GStreamer?pipeline?for?capturing?from?the?CSI?camera
#?Defaults?to?1280x720?@?30fps
#?Flip?the?image?by?setting?the?flip_method?（most?common?values:?0?and?2）
#?display_width?and?display_height?determine?the?size?of?the?window?on?the?screen


def?gstreamer_pipeline（
????capture_width=3280
????capture_height=2464
????display_width=820
????display_height=616
????framerate=21
????flip_method=0
）:
????return?（
????????“nvarguscamerasrc?!?“
????????“video/x-raw（memory:NVMM）?“
????????“width=（int）%d?height=（int）%d?“
????????“format=（string）NV12?framerate=（fraction）%d/1?!?“
????????“nvvidconv?flip-method=%d?!?“
????????“video/x-raw?width=（int）%d?height=（int）%d?format=（string）BGRx?!?“
????????“videoconvert?!?“
????????“video/x-raw?format=（string）BGR?!?appsink“
????????%?（
????????????capture_width
????????????capture_height
????????????framerate
????????????flip_method
????????????display_width
????????????display_height
????????）
????）


def?face_detect（）:
????face_cascade?=?cv2.CascadeClassifier（
????????“./haar/haarcascade_frontalface_default.xml“
????）
????eye_cascade?=?cv2.CascadeClassifier（
????????“