Webcam show fix (#9847)

* Webcam show fix

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* Update common.py

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

models/common.py

@@ -24,14 +24,12 @@ from torch.cuda import amp
 
 from utils import TryExcept
 from utils.dataloaders import exif_transpose, letterbox
-from utils.general import (LOGGER, ROOT, Profile, check_imshow, check_requirements, check_suffix, check_version,
-                           colorstr, increment_path, make_divisible, non_max_suppression, scale_boxes, xywh2xyxy,
+from utils.general import (LOGGER, ROOT, Profile, check_requirements, check_suffix, check_version, colorstr,
+                           increment_path, is_notebook, make_divisible, non_max_suppression, scale_boxes, xywh2xyxy,
                            xyxy2xywh, yaml_load)
 from utils.plots import Annotator, colors, save_one_box
 from utils.torch_utils import copy_attr, smart_inference_mode
 
-CHECK_IMSHOW = check_imshow()
-
 
 def autopad(k, p=None, d=1):  # kernel, padding, dilation
     # Pad to 'same' shape outputs
@@ -760,7 +758,7 @@ class Detections:
 
             im = Image.fromarray(im.astype(np.uint8)) if isinstance(im, np.ndarray) else im  # from np
             if show:
-                im.show(self.files[i]) if CHECK_IMSHOW else display(im)
+                display(im) if is_notebook() else im.show(self.files[i])
             if save:
                 f = self.files[i]
                 im.save(save_dir / f)  # save

utils/general.py

@@ -395,7 +395,6 @@ def check_imshow(warn=False):
     try:
         assert not is_notebook()
         assert not is_docker()
-        assert 'NoneType' not in str(type(IPython.get_ipython()))  # SSH terminals, GitHub CI
         cv2.imshow('test', np.zeros((1, 1, 3)))
         cv2.waitKey(1)
         cv2.destroyAllWindows()