Add --source screen for screenshot inference (#9542)

* add screenshot as source

* fix: screen number support

* Fix: mutiple screen specific area

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

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* parse screen args in LoadScreenshots

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

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* sequence+ '_' as file name for save-txt save-crop

* screenshot as stream

* Update requirements.txt

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

* Update dataloaders.py

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

* Update dataloaders.py

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

* Update detect.py

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

* Update detect.py

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

* Update detect.py

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

* Update dataloaders.py

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

* Update detect.py

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* Update detect.py

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* Update predict.py

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* Update detect.py

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* Update predict.py

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* Update README.md

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* Update tutorial.ipynb

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

README.md

@@ -107,6 +107,7 @@ the latest YOLOv5 [release](https://github.com/ultralytics/yolov5/releases) and
 python detect.py --source 0  # webcam
                           img.jpg  # image
                           vid.mp4  # video
+                          screen  # screenshot
                           path/  # directory
                           'path/*.jpg'  # glob
                           'https://youtu.be/Zgi9g1ksQHc'  # YouTube