# Picar camera computer vision project 7

**URL:** <https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384>\
**Category:** General\
**Created:** [February 16, 2026, 11:57am UTC](https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384 "2026-02-16T11:57:49Z")\
**Posts on this page:** 12\
**Page:** 1

<div class="post-metadata">

**Author:** ![bobshafer](https://avatars.discourse-cdn.com/v4/letter/b/e9a140/32.png) [@bobshafer](https://forum.sunfounder.com/u/bobshafer)\
**Post date:** [February 16, 2026, 11:57am UTC](https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384/1 "2026-02-16T11:57:49Z")

</div>

I am getting acquainted with my new Picar-x. All was going well until project 7, computer\_vision. I am not getting the specified promp. Instead I get this:  
tTraceback (most recent call last):  
File “/home/bobshafer/picar-x/example/7.computer\_vision.py”, line 2, in  
from vilib import Vilib  
File “/usr/local/lib/python3.13/dist-packages/vilib/ **init**.py”, line 2, in  
from .vilib import Vilib  
File “/usr/local/lib/python3.13/dist-packages/vilib/vilib.py”, line 182, in  
class Vilib(object):  
…\<635 lines\>…  
return img  
File “/usr/local/lib/python3.13/dist-packages/vilib/vilib.py”, line 184, in Vilib  
picam2 = Picamera2()  
File “/usr/lib/python3/dist-packages/picamera2/picamera2.py”, line 341, in **init**  
camera\_num = self.global\_camera\_info()[camera\_num][‘Num’]  
~~~~~~~~~~~~~~~~~~~~~~~~~ ^^^^^^^^^^^^  
IndexError: list index out of range..

I reinstalled the camera cable. Any help would be appreciated.

---

<div class="post-metadata">

**Author:** ![Spf650](https://avatars.discourse-cdn.com/v4/letter/s/f05b48/32.png) [@Spf650](https://forum.sunfounder.com/u/Spf650)\
**Post date:** [February 16, 2026, 1:03pm UTC](https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384/2 "2026-02-16T13:03:26Z")

</div>

It does look as if your camera is not correctly connected.

What does the simpler

```auto
 rpicam-hello

```

say?

This doesn’t require any Sunfounder libraries nor picar hardware. Just the rpi and camera.

I’ve seen similar issues so many times on this forum that I’m starting to think that sunfounder could add a quick connectivity check between the camera and rpi before any assembly or library installation takes place, just for the user to be able to visualise and verify the final correct connections. This could save a lot of rebuilds IMHO

---

<div class="post-metadata">

**Author:** ![SunFounder\_Moderator](https://avatars.discourse-cdn.com/v4/letter/s/34f0e0/32.png) [@SunFounder\_Moderator](https://forum.sunfounder.com/u/SunFounder_Moderator)\
**Post date:** [February 24, 2026, 9:08am UTC](https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384/3 "2026-02-24T09:08:43Z")

</div>

@Spf650, thank you very much for your suggestion. We will add this command to the relevant course as soon as possible.

@bobshafer, please run rpicam-hello to check. At the same time, could you send us a photo of the wiring connections on both ends of the camera?

---

<div class="post-metadata">

**Author:** ![bobshafer](https://avatars.discourse-cdn.com/v4/letter/b/e9a140/32.png) [@bobshafer](https://forum.sunfounder.com/u/bobshafer)\
**Post date:** [February 28, 2026, 5:38pm UTC](https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384/4 "2026-02-28T17:38:36Z")

</div>

bobshafer@Picar:~/picar-x/example $ sudo python3 7.computer\_vision.py  
vilib 0.3.18 launching …  
picamera2 0.3.34  
Thanks for getting back to me. I am sorry to be so slow responding. I am new to forums. Following is the command responses.

Traceback (most recent call last):  
File “/home/bobshafer/picar-x/example/7.computer\_vision.py”, line 2, in  
from vilib import Vilib  
File “/usr/local/lib/python3.13/dist-packages/vilib/ **init**.py”, line 2, in  
from .vilib import Vilib  
File “/usr/local/lib/python3.13/dist-packages/vilib/vilib.py”, line 182, in  
class Vilib(object):  
…\<635 lines\>…  
return img  
File “/usr/local/lib/python3.13/dist-packages/vilib/vilib.py”, line 184, in Vilib  
picam2 = Picamera2()  
File “/usr/lib/python3/dist-packages/picamera2/picamera2.py”, line 341, in **init**  
camera\_num = self.global\_camera\_info()[camera\_num][‘Num’]  
~~~~~~~~~~~~~~~~~~~~~~~~~ ^^^^^^^^^^^^  
IndexError: list index out of range  
bobshafer@Picar:~/picar-x/example $

bobshafer@Picar:~/picar-x/example $ rpicam-hello  
[0:22:11.301316397] [2416] INFO Camera camera\_manager.cpp:340 libcamera v0.7.0+rpt20260205  
Made X/EGL preview window  
Made DRM preview window  
Preview window unavailable  
ERROR: \*\*\* no cameras available \*\*\*  
bobshafer@Picar:~/picar-x/example $

---

<div class="post-metadata">

**Author:** ![bobshafer](https://avatars.discourse-cdn.com/v4/letter/b/e9a140/32.png) [@bobshafer](https://forum.sunfounder.com/u/bobshafer)\
**Post date:** [February 28, 2026, 5:39pm UTC](https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384/5 "2026-02-28T17:39:43Z")

</div>

One more thing. I replaced the camera cable.

---

<div class="post-metadata">

**Author:** ![Spf650](https://avatars.discourse-cdn.com/v4/letter/s/f05b48/32.png) [@Spf650](https://forum.sunfounder.com/u/Spf650)\
**Post date:** [February 28, 2026, 6:24pm UTC](https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384/6 "2026-02-28T18:24:56Z")

</div>

Please run the command i previously suggested, rpicam-hello.

That isolates the camera from the scenario. No other library dependencies etc.

However, it still looks like your camera is not connected. The above command will verify this. Usually in these scenarios, the camera cable is rotated 180’ at one or both ends, ive also seen it connected to the dsi not the csi port. If you can post close up photos of both ends, sunfounder should be able to see any issues immediately.

---

<div class="post-metadata">

**Author:** ![bobshafer](https://avatars.discourse-cdn.com/v4/letter/b/e9a140/32.png) [@bobshafer](https://forum.sunfounder.com/u/bobshafer)\
**Post date:** [February 28, 2026, 8:45pm UTC](https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384/7 "2026-02-28T20:45:22Z")

</div>

Here is the response to rpicam-hello. Please see second message at end. Thanks.

bobshafer@Picar:~/picar-x/example $ rpicam-hello  
[0:03:39.480607038] [2000] INFO Camera camera\_manager.cpp:340 libcamera v0.7.0+rpt20260205  
[0:03:39.686814553] [2004] INFO IPAProxy ipa\_proxy.cpp:180 Using tuning file /usr/share/libcamera/ipa/rpi/vc4/ov5647.json  
[0:03:39.706671114] [2004] INFO Camera camera\_manager.cpp:223 Adding camera ‘/base/soc/i2c0mux/i2c@1/ov5647@36’ for pipeline handler rpi/vc4  
[0:03:39.706884537] [2004] INFO RPI vc4.cpp:445 Registered camera /base/soc/i2c0mux/i2c@1/ov5647@36 to Unicam device /dev/media0 and ISP device /dev/media1  
[0:03:39.707005675] [2004] INFO RPI pipeline\_base.cpp:1117 Using configuration file ‘/usr/share/libcamera/pipeline/rpi/vc4/rpi\_apps.yaml’  
Made X/EGL preview window  
Made DRM preview window  
Preview window unavailable  
Mode selection for 1296:972:12:P  
SGBRG10\_CSI2P,640x480/0 - Score: 3296  
SGBRG10\_CSI2P,1296x972/0 - Score: 1000  
SGBRG10\_CSI2P,1920x1080/0 - Score: 1349.67  
SGBRG10\_CSI2P,2592x1944/0 - Score: 1567  
Stream configuration adjusted  
[0:03:40.136923035] [2000] INFO Camera camera.cpp:1215 configuring streams: (0) 1296x972-YUV420/sYCC (1) 1296x972-SGBRG10\_CSI2P/RAW  
[0:03:40.137686108] [2004] INFO RPI vc4.cpp:620 Sensor: /base/soc/i2c0mux/i2c@1/ov5647@36 - Selected sensor format: 1296x972-SGBRG10\_1X10/RAW - Selected unicam format: 1296x972-pGAA/RAW  
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#145 (30.01 fps) exp 33239.00 ag 7.25 dg 1.01  
#146 (30.00 fps) exp 33239.00 ag 7.25 dg 1.01

This is the response when I run 7.computer\_vision. What does it mean “Local display failed, because there is no gui?

bobshafer@Picar:~/picar-x/example $ sudo python3 7.computer\_vision.py  
vilib 0.3.18 launching …  
picamera2 0.3.34  
Local display failed, because there is no gui.

Web display on:  
eth0: error fetching interface information: Device not found

[http://192.168.1.212:9000/mjpg](http://192.168.1.212:9000/mjpg)

Starting web streaming …

Input key to call the function!  
q: Take photo  
1: Color detect : red  
2: Color detect : orange  
3: Color detect : yellow  
4: Color detect : green  
5: Color detect : blue  
6: Color detect : purple  
0: Switch off Color detect  
r: Scan the QR code  
f: Switch ON/OFF face detect  
s: Display detected object information

- Serving Flask app ‘vilib.vilib’
- Debug mode: off

---

<div class="post-metadata">

**Author:** ![bobshafer](https://avatars.discourse-cdn.com/v4/letter/b/e9a140/32.png) [@bobshafer](https://forum.sunfounder.com/u/bobshafer)\
**Post date:** [February 28, 2026, 8:55pm UTC](https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384/8 "2026-02-28T20:55:27Z")

</div>

If I click on the link 192.168.1.212 I see real time video. How does it work in the Picar setup?

---

<div class="post-metadata">

**Author:** ![Spf650](https://avatars.discourse-cdn.com/v4/letter/s/f05b48/32.png) [@Spf650](https://forum.sunfounder.com/u/Spf650)\
**Post date:** [March 1, 2026, 7:43am UTC](https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384/9 "2026-03-01T07:43:49Z")

</div>

That looks better.

How are you accessing the picar? ssh? From a PC? Mac? Linux machine?

Try

```auto
ssh -X

```

Instead to export the display

Or better use vnc

But, im not an expert in this exact area, i dont have a picarx, sunfounder will have certainly seen this exact issue before and give a better considered reply. Im only speculating best guesses. May be better to await their reply

---

<div class="post-metadata">

**Author:** ![bobshafer](https://avatars.discourse-cdn.com/v4/letter/b/e9a140/32.png) [@bobshafer](https://forum.sunfounder.com/u/bobshafer)\
**Post date:** [March 1, 2026, 11:18am UTC](https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384/10 "2026-03-01T11:18:09Z")

</div>

I access the Picar via ssh using a Windows 11 laptop.  
Bob Shafer  
814/599-1690

---

<div class="post-metadata">

**Author:** ![Spf650](https://avatars.discourse-cdn.com/v4/letter/s/f05b48/32.png) [@Spf650](https://forum.sunfounder.com/u/Spf650)\
**Post date:** [March 1, 2026, 11:36am UTC](https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384/11 "2026-03-01T11:36:55Z")

</div>

So try

ssh -X

To export the display and see if it then works ( upper case X)

If no joy then connect via vnc.

You will need to enable vnc server via raspi-config first though on picar. And if its a PC you may need to install a vnc viewer onto the PC.

But sunfounder will have seen this all before, and give you a more definitive answer than I

---

<div class="post-metadata">

**Author:** ![SunFounder\_Moderator](https://avatars.discourse-cdn.com/v4/letter/s/34f0e0/32.png) [@SunFounder\_Moderator](https://forum.sunfounder.com/u/SunFounder_Moderator)\
**Post date:** [March 2, 2026, 9:52am UTC](https://forum.sunfounder.com/t/picar-camera-computer-vision-project-7/4384/12 "2026-03-02T09:52:48Z")

</div>

It looks like your camera is already working properly. The 7.computer\_vision.py script is mainly designed to allow users to preview the PiCar-X’s camera feed via a web browser, so the fact that you’re seeing the feed means your PiCar-X is functioning correctly.

The message about no display being detected appears because you are accessing the PiCar via SSH from a Windows 11 laptop, which doesn’t have a graphical desktop environment running.

To run scripts that require a display or to use the desktop interface, you can either:

Connect a physical monitor and keyboard directly to your PiCar-X.

Access the Raspberry Pi desktop remotely using VNC.

For detailed instructions on setting up a remote desktop connection via VNC, please refer to our tutorial: [https://docs.sunfounder.com/projects/picar-x-v20/en/latest/\_shared/appendix/remote\_desktop.html](https://docs.sunfounder.com/projects/picar-x-v20/en/latest/%5C_shared/appendix/remote_desktop.html)