回答編集履歴
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namedWindow
answer
CHANGED
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@@ -2,4 +2,7 @@
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2
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[https://docs.opencv.org/4.1.2/d7/dfc/group__highgui.html#ga9e80e080f7ef33f897e415358aee7f7e](https://docs.opencv.org/4.1.2/d7/dfc/group__highgui.html#ga9e80e080f7ef33f897e415358aee7f7e)
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3
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4
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`imshow`はすでにWindowが作られていない場合、`cv::WINDOW_AUTOSIZE`フラグを建てます。
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5
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[https://docs.opencv.org/4.1.2/d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563](https://docs.opencv.org/4.1.2/d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563)
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5
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[https://docs.opencv.org/4.1.2/d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563](https://docs.opencv.org/4.1.2/d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563)
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つまり例えば`namedWindow`のような関数で予めWindowを作成しなければなりません。
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[https://docs.opencv.org/4.1.2/d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b](https://docs.opencv.org/4.1.2/d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b)
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