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| # Copyright (C) 2021-2024, Mindee. | |
| # This program is licensed under the Apache License 2.0. | |
| # See LICENSE or go to <https://opensource.org/licenses/Apache-2.0> for full license details. | |
| from typing import List, Union | |
| import numpy as np | |
| import tensorflow as tf | |
| from tensorflow import keras | |
| from doctr.models.preprocessor import PreProcessor | |
| from doctr.utils.repr import NestedObject | |
| __all__ = ["OrientationPredictor"] | |
| class OrientationPredictor(NestedObject): | |
| """Implements an object able to detect the reading direction of a text box or a page. | |
| 4 possible orientations: 0, 90, 180, 270 (-90) degrees counter clockwise. | |
| Args: | |
| ---- | |
| pre_processor: transform inputs for easier batched model inference | |
| model: core classification architecture (backbone + classification head) | |
| """ | |
| _children_names: List[str] = ["pre_processor", "model"] | |
| def __init__( | |
| self, | |
| pre_processor: PreProcessor, | |
| model: keras.Model, | |
| ) -> None: | |
| self.pre_processor = pre_processor | |
| self.model = model | |
| def __call__( | |
| self, | |
| inputs: List[Union[np.ndarray, tf.Tensor]], | |
| ) -> List[Union[List[int], List[float]]]: | |
| # Dimension check | |
| if any(input.ndim != 3 for input in inputs): | |
| raise ValueError("incorrect input shape: all inputs are expected to be multi-channel 2D images.") | |
| processed_batches = self.pre_processor(inputs) | |
| predicted_batches = [self.model(batch, training=False) for batch in processed_batches] | |
| # confidence | |
| probs = [tf.math.reduce_max(tf.nn.softmax(batch, axis=1), axis=1).numpy() for batch in predicted_batches] | |
| # Postprocess predictions | |
| predicted_batches = [out_batch.numpy().argmax(1) for out_batch in predicted_batches] | |
| class_idxs = [int(pred) for batch in predicted_batches for pred in batch] | |
| classes = [int(self.model.cfg["classes"][idx]) for idx in class_idxs] | |
| confs = [round(float(p), 2) for prob in probs for p in prob] | |
| return [class_idxs, classes, confs] | |