/**
 * @license
 * Copyright 2021 Google LLC. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =============================================================================
 */
import * as tf from '@tensorflow/tfjs-core';
import { Matrix4x4 } from './calculate_inverse_matrix';
import { Padding, PixelInput } from './interfaces/common_interfaces';
import { ImageToTensorConfig } from './interfaces/config_interfaces';
import { Rect } from './interfaces/shape_interfaces';
/**
 * Convert an image or part of it to an image tensor.
 *
 * @param image An image, video frame or image tensor.
 * @param config
 *      inputResolution: The target height and width.
 *      keepAspectRatio?: Whether target tensor should keep aspect ratio.
 * @param normRect A normalized rectangle, representing the subarea to crop from
 *      the image. If normRect is provided, the returned image tensor represents
 *      the subarea.
 * @returns A map with the following properties:
 *     - imageTensor
 *     - padding: Padding ratio of left, top, right, bottom, based on the output
 * dimensions.
 *     - transformationMatrix: Projective transform matrix used to transform
 * input image to transformed image.
 */
export declare function convertImageToTensor(image: PixelInput, config: ImageToTensorConfig, normRect?: Rect): {
    imageTensor: tf.Tensor4D;
    padding: Padding;
    transformationMatrix: Matrix4x4;
};