ocv_qr_detect() returns incorrect coordinates on Linux

[ihellman]

I recently submitted a feature request #39 to return the coordinates of the QR code in the image. The updated version works great on Windows and MacOS but on Linux (where I need it to run), the returned coordinates are the boundaries of the entire image, not the QR code. When draw = TRUE is on, the blue bounding box borders the entire image.

Some info about the system:
Ubuntu 22.04.3 LTS
R Version: 4.3.2
R Studio Server: 2023.06.0 Build 421

Example Command:
library(opencv)
img <- opencv::ocv_read("https://scoutek-media.s3.amazonaws.com/photos/76879639-ef2066158d.jpg")
opencv::ocv_qr_detect(img, draw = TRUE)

Output from above

opencv::ocv_qr_detect(img, draw = TRUE)
<pointer: 0x55c04fb35f50>
attr(,"class")
[1] "opencv-image"
attr(,"value")
[1] "top"
attr(,"points")
[,1] [,2]
[1,] 0 0
[2,] 1919 0
[3,] 1919 1079
[4,] 0 1079

[jeroen]

Does it make a difference if you use the WeChat implemation or the other one? Op do 25 jan. 2024 18:16 schreef Ian Hellman ***@***.***>:

…

I recently submitted a feature request #39 <#39> to return the coordinates of the QR code in the image. The updated version works great on Windows and MacOS but on Linux (where I need it to run), the returned coordinates are the boundaries of the entire image, not the QR code. When draw = TRUE is on, the blue bounding box borders the entire image. *Some info about the system:* Ubuntu 22.04.3 LTS R Version: 4.3.2 R Studio Server: 2023.06.0 Build 421 *Example Command:* library(opencv) img <- opencv::ocv_read(" https://scoutek-media.s3.amazonaws.com/photos/76879639-ef2066158d.jpg") opencv::ocv_qr_detect(img, draw = TRUE) *Output from above* opencv::ocv_qr_detect(img, draw = TRUE) <pointer: 0x55c04fb35f50> attr(,"class") [1] "opencv-image" attr(,"value") [1] "top" attr(,"points") [,1] [,2] [1,] 0 0 [2,] 1919 0 [3,] 1919 1079 [4,] 0 1079 — Reply to this email directly, view it on GitHub <#40>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AABUZ73AEQZVO2JTUIPEVTDYQKHNRAVCNFSM6AAAAABCK4GTEKVHI2DSMVQWIX3LMV43ASLTON2WKOZSGEYDAOBTHA3TKNY> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[ihellman]

'quirc' returns NULL on both Windows and Linux.
'wechat' works on Windows but Linux returns the output above.

[jeroen]

Yes I tried it myself as well, very strange. It works fine on other Linux distros like Fedora, but not on Ubuntu.

[ihellman]

Thanks for the insight. I also works for me on Fedora and I was able to move my project over to that.