image_sampling.h

/*
 * Copyright 2022 Adobe. All rights reserved.
 * This file is licensed to you 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 http://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 REPRESENTATIONS
 * OF ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
#pragma once
 
#include <lagrange/common.h>
#include <lagrange/image/ImageView.h>
#include <lagrange/image/api.h>
 
namespace lagrange {
namespace image {

LA_IMAGE_API void sample_from_density_map(
    const image::ImageView<float>& density_map,
    size_t n_samples,
    lagrange::Vertices2Df& samples);

enum class SampleType {
    Density, 
    Regular 
};

LA_IMAGE_API void sample_borders(
    const image::ImageView<float>& density_map,
    size_t n_samples,
    lagrange::Vertices2Df& samples,
    SampleType type = SampleType::Regular);

LA_IMAGE_API void density_sample_borders(
    const image::ImageView<float>& density_map,
    size_t n_samples,
    lagrange::Vertices2Df& samples);
 

LA_IMAGE_API void regular_sample_borders(
    const image::ImageView<float>& density_map,
    size_t n_samples,
    lagrange::Vertices2Df& samples);

LA_IMAGE_API float bilinear_interpolation(const image::ImageView<float>& image, float x, float y);

LA_IMAGE_API float
nearest_neighbor_interpolation(const image::ImageView<float>& image, float x, float y);
 

LA_IMAGE_API float
percentile(const image::ImageView<float>& image, const float x, const int num_bins = 1000);
 
} // namespace image
} // namespace lagrange