# Issue on Nvidia Jetson Nano and Raspberry Pi V2.1 Camera ( Camera Does Not Open)

**URL:** <https://forum.opencv.org/t/issue-on-nvidia-jetson-nano-and-raspberry-pi-v2-1-camera-camera-does-not-open/9514>\
**Category:** Uncategorized\
**Tags:** raspberrypi, videoio, nvidia\
**Created:** [July 15, 2022, 5:33pm UTC](https://forum.opencv.org/t/issue-on-nvidia-jetson-nano-and-raspberry-pi-v2-1-camera-camera-does-not-open/9514 "2022-07-15T17:33:30Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![M\_7](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/m_7/32/4435_2.png) [@M\_7](https://forum.opencv.org/u/M_7)\
**Post date:** [July 15, 2022, 5:33pm UTC](https://forum.opencv.org/t/issue-on-nvidia-jetson-nano-and-raspberry-pi-v2-1-camera-camera-does-not-open/9514/1 "2022-07-15T17:33:31Z")

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Hi, I am using Nvidia Jetson Nano and Raspberry Pi V2.1 Camera for color detection via Python and OpenCV. However, the codes that worked on my computer do not work on Jetson Nano and I keep getting errors. The camera is working, I checked it. Also, Jetson Nano is in operation but camera does not opened. I could not get the problem.

Here is my code:

import cv2  
print(cv2. **version** )  
dispW=320  
dispH=240  
flip=2  
camSet=‘nvarguscamerasrc ! video/x-raw(memory:NVMM), width=3264, height=2464, format=NV12, framerate=21/1 ! nvvidconv flip-method=’+str(flip)+’ ! video/x-raw, width=‘+str(dispW)+’, height=‘+str(dispH)+’, format=BGRx ! videoconvert ! video/x-raw, format=BGR ! appsink’

cam=cv2.VideoCapture(camSet)  
lower\_red = (147,46,91)  
upper\_red = (180,255,255)

while True:  
ret, frame=cam.read()

```
hsv = cv2.cvtColor(frame, cv2.COLOR_BGR2HSV)
mask = cv2.inRange(hsv, lower_red,upper_red)
final_frame = cv2.bitwise_and(frame,frame, mask = mask)

cv2.imshow("Frame", frame)
cv2.imshow("Mask", mask)
cv2.imshow("Final", final_frame)

if cv2.waitKey(1) ==ord("q"):
    break

```

cam.release()  
cv2.destroyAllWindows()

And here is the error:  
3.2.0

OpenCV Error: Assertion failed ((scn== 3 || scn == 4) && (depth == CV\_8U || depth == CV\_32F)) in cvtColor, file /build/opencv-XDqSFW/opencv 3.2.0+dfsg/modules/imgproc/src/color.cpp, line 9815 Traceback (most recent call last):  
File “red.py”, line 15, in

hsv = cv2.cvtColor(frame, cv2.COLOR\_BGR2HSV)

cv2.error: /build/opencv-XDqSFW/opencv 3.2.0+dfsg/modules/imgproc/src/color.cpp:9815: error: (-215) (scn== 3 || scn== 4) && (depth == CV\_8U || depth == CV\_32F) in function cvtColor

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<div class="post-metadata">

**Author:** ![berak](https://avatars.discourse-cdn.com/v4/letter/b/85f322/32.png) [@berak](https://forum.opencv.org/u/berak)\
**Post date:** [July 15, 2022, 6:22pm UTC](https://forum.opencv.org/t/issue-on-nvidia-jetson-nano-and-raspberry-pi-v2-1-camera-camera-does-not-open/9514/3 "2022-07-15T18:22:59Z")

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<div class="post-metadata">

**Author:** ![berak](https://avatars.discourse-cdn.com/v4/letter/b/85f322/32.png) [@berak](https://forum.opencv.org/u/berak)\
**Post date:** [July 15, 2022, 6:26pm UTC](https://forum.opencv.org/t/issue-on-nvidia-jetson-nano-and-raspberry-pi-v2-1-camera-camera-does-not-open/9514/4 "2022-07-15T18:26:28Z")

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<div class="post-metadata">

**Author:** ![M\_7](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/m_7/32/4435_2.png) [@M\_7](https://forum.opencv.org/u/M_7)\
**Post date:** [July 15, 2022, 6:26pm UTC](https://forum.opencv.org/t/issue-on-nvidia-jetson-nano-and-raspberry-pi-v2-1-camera-camera-does-not-open/9514/5 "2022-07-15T18:26:35Z")

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Even codes’ beginning is the same, their errors are different and I couldn’t solve both of them.

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<div class="post-metadata">

**Author:** ![berak](https://avatars.discourse-cdn.com/v4/letter/b/85f322/32.png) [@berak](https://forum.opencv.org/u/berak)\
**Post date:** [July 16, 2022, 10:32am UTC](https://forum.opencv.org/t/issue-on-nvidia-jetson-nano-and-raspberry-pi-v2-1-camera-camera-does-not-open/9514/6 "2022-07-16T10:32:48Z")

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