Bug#978452: python3-opencv: missing dependency on libcharls2

[Sandro Tosi]

Package: python3-opencv
Version: 4.5.1+dfsg-1
Severity: grave

Hello,
i've just upgraded to opencv 4.5.1 and when importing the python module, i got
this error:

Traceback (most recent call last):
  File "tool", line 10, in <module>
    import cv2
ImportError: libcharls.so.2: cannot open shared object file: No such file or directory

which is provided by libcharls2, and after installing it, i can import cv2 fine.

set to RC level because if i cant even import the module, that's a broken enough
package that's unusable.

Regards,
Sandro

-- System Information:
Debian Release: 10.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.6.0-1-amd64 (SMP w/8 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages python3-opencv depends on:
ii  libc6                               2.30-2
ii  libgcc-s1                           10.2.1-3
ii  libopencv-calib3d4.5                4.5.1+dfsg-1
ii  libopencv-contrib4.5                4.5.1+dfsg-1
ii  libopencv-core4.5                   4.5.1+dfsg-1
ii  libopencv-dnn4.5                    4.5.1+dfsg-1
ii  libopencv-features2d4.5             4.5.1+dfsg-1
ii  libopencv-flann4.5                  4.5.1+dfsg-1
ii  libopencv-highgui4.5                4.5.1+dfsg-1
ii  libopencv-imgcodecs4.5              4.5.1+dfsg-1
ii  libopencv-imgproc4.5                4.5.1+dfsg-1
ii  libopencv-ml4.5                     4.5.1+dfsg-1
ii  libopencv-objdetect4.5              4.5.1+dfsg-1
ii  libopencv-photo4.5                  4.5.1+dfsg-1
ii  libopencv-shape4.5                  4.5.1+dfsg-1
ii  libopencv-stitching4.5              4.5.1+dfsg-1
ii  libopencv-superres4.5               4.5.1+dfsg-1
ii  libopencv-video4.5                  4.5.1+dfsg-1
ii  libopencv-videoio4.5                4.5.1+dfsg-1
ii  libopencv-videostab4.5              4.5.1+dfsg-1
ii  libopencv-viz4.5                    4.5.1+dfsg-1
ii  libstdc++6                          10.2.1-3
ii  python3                             3.9.1-1
ii  python3-numpy [python3-numpy-abi9]  1:1.19.4-1+b1

python3-opencv recommends no packages.

python3-opencv suggests no packages.

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