回答編集履歴
2
補足
test
CHANGED
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@@ -25,3 +25,15 @@
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+model.train(samples, cv2.ml.ROW_SAMPLE, responses)
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```
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あと`im = cv2.imread('pi.png')`の戻り値は絶対にチェックしてください。
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```Python
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assert im is not None, 'cannot open file as image.'
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```
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◇参考情報
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[python opencvでグレースケール変換を行いたい](https://teratail.com/questions/134267)
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1
追記
test
CHANGED
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@@ -7,3 +7,21 @@
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[OpenCV 3.4.1: KNearest function not found](https://stackoverflow.com/questions/51145691/opencv-3-4-1-knearest-function-not-found)
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---
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「TypeError: only size-1 arrays can be converted to Python scalars」で検索すると
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[KNN train() in cv2 with opencv 3.0](https://stackoverflow.com/questions/32980675/knn-train-in-cv2-with-opencv-3-0)
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```diff
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-model.train(samples, responses)
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+model.train(samples, cv2.ml.ROW_SAMPLE, responses)
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```
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