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CropAroundCenter

class mmedit.datasets.transforms.CropAroundCenter(crop_size)[source]

Randomly crop the images around unknown area in the center 1/4 images.

This cropping strategy is adopted in GCA matting. The unknown area is the same as semi-transparent area. https://arxiv.org/pdf/2001.04069.pdf

It retains the center 1/4 images and resizes the images to ‘crop_size’. Required keys are “fg”, “bg”, “trimap” and “alpha”, added or modified keys are “crop_bbox”, “fg”, “bg”, “trimap” and “alpha”.

Parameters

crop_size (int | tuple) – Desired output size. If int, square crop is applied.

transform(results)[source]

Transform function.

Parameters

results (dict) – A dict containing the necessary information and data for augmentation.

Returns

A dict containing the processed data and information.

Return type

dict

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