TextDetRandomCropFlip

class mmocr.datasets.transforms.TextDetRandomCropFlip(pad_ratio=0.1, crop_ratio=0.5, iter_num=1, min_area_ratio=0.2, epsilon=0.01)

Random crop and flip a patch in the image. Only used in text detection task.

Required Keys:

• img

• gt_bboxes

• gt_polygons

Modified Keys:

• img

• gt_bboxes

• gt_polygons

Parameters

• pad_ratio (float) – The ratio of padding. Defaults to 0.1.

• crop_ratio (float) – The ratio of cropping. Defaults to 0.5.

• iter_num (int) – Number of operations. Defaults to 1.

• min_area_ratio (float) – Minimal area ratio between cropped patch and original image. Defaults to 0.2.

• epsilon (float) – The threshold of polygon IoU between cropped area and polygon, which is used to avoid cropping text instances. Defaults to 0.01.

Return type

None

transform(results)

Applying random crop flip on results.

Parameters

results (dict) – Result dict containing the data to transform

Returns

The transformed data

Return type

dict