GitLab

* Use cv2 to normalize img

* multipy faster than divide

* also do imdenormalize

* support more channels

* even faster
Signed-off-by: lizz <lizz@sensetime.com>

* add test
Signed-off-by: lizz <lizz@sensetime.com>

* even even faster
Signed-off-by: lizz <lizz@sensetime.com>

* fffaster
Signed-off-by: lizz <lizz@sensetime.com>

* okay
Signed-off-by: lizz <lizz@sensetime.com>

* guard against implace modification
Signed-off-by: lizz <lizz@sensetime.com>

* fix imdenormalize
Signed-off-by: lizz <lizz@sensetime.com>

* tidy
Signed-off-by: lizz <lizz@sensetime.com>

* clean
Signed-off-by: lizz <lizz@sensetime.com>

* Update test_image.py

* Update test_image.py

* Update test_image.py

* Update test_image.py

* Update test_image.py

* Update test_image.py