解決策。TypeError: cannot unpack non-iterable numpy.int32 object。opencvのcv2.detail.leaveBiggestComponent関連。

解決策。TypeError: cannot unpack non-iterable numpy.int32 object。opencvのcv2.detail.leaveBiggestComponent関連。

エラー

TypeError: cannot unpack non-iterable numpy.int32 object

詳細
↓

Traceback (most recent call last):
  File "panorama.py", line 84, in <module>
    conn_images, features, p = largest_connected_subset(all_images)
  File "panorama.py", line 38, in largest_connected_subset
    conn_indices = [i for [i] in _conn_indices]
  File "panorama.py", line 38, in <listcomp>
    conn_indices = [i for [i] in _conn_indices]
TypeError: cannot unpack non-iterable numpy.int32 object

環境

windows10
python3.7
opencv-python 4.6.0

エラーにあったコード

https://github.com/PacktPublishing/OpenCV-4-with-Python-Blueprints-Second-Edition

解決策

結論

これは、opencv-pythonが4.6.0で、cv2.detail.leaveBiggestComponentのリターンの形が少しだけ変わったからです。

具体的な情報

4.5.3のstitching_detailed.py

    indices = cv.detail.leaveBiggestComponent(features, p, conf_thresh)
    img_subset = []
    img_names_subset = []
    full_img_sizes_subset = []
    for i in range(len(indices)):
        img_names_subset.append(img_names[indices[i, 0]])
        img_subset.append(images[indices[i, 0]])
        full_img_sizes_subset.append(full_img_sizes[indices[i, 0]])
    images = img_subset

4.6.0のstitching_detailed.py

    indices = cv.detail.leaveBiggestComponent(features, p, conf_thresh)
    img_subset = []
    img_names_subset = []
    full_img_sizes_subset = []
    for i in range(len(indices)):
        img_names_subset.append(img_names[indices[i]])
        img_subset.append(images[indices[i]])
        full_img_sizes_subset.append(full_img_sizes[indices[i]])
    images = img_subset

ですから
↑　を参考に、ソースを修正して下さい。

コメント

時間があるときに、もう少し、整理したいと思いますが。。。。