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sift.cpp
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132 lines (115 loc) · 5.04 KB
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/*******************************************************
* Copyright (c) 2015, ArrayFire
* All rights reserved.
*
* This file is distributed under 3-clause BSD license.
* The complete license agreement can be obtained at:
* http://arrayfire.com/licenses/BSD-3-Clause
********************************************************/
#include <af/dim4.hpp>
#include <af/defines.h>
#include <af/features.h>
#include <af/vision.h>
#include <handle.hpp>
#include <err_common.hpp>
#include <backend.hpp>
#include <features.hpp>
#include <sift.hpp>
using af::dim4;
using namespace detail;
template<typename T, typename convAccT>
static void sift(af_features& feat_, af_array& descriptors, const af_array& in, const unsigned n_layers,
const float contrast_thr, const float edge_thr, const float init_sigma,
const bool double_input, const float img_scale, const float feature_ratio,
const bool compute_GLOH)
{
Array<float> x = createEmptyArray<float>(dim4());
Array<float> y = createEmptyArray<float>(dim4());
Array<float> score = createEmptyArray<float>(dim4());
Array<float> ori = createEmptyArray<float>(dim4());
Array<float> size = createEmptyArray<float>(dim4());
Array<float> desc = createEmptyArray<float>(dim4());
af_features_t feat;
feat.n = sift<T, convAccT>(x, y, score, ori, size, desc, getArray<T>(in),
n_layers, contrast_thr, edge_thr, init_sigma,
double_input, img_scale, feature_ratio, compute_GLOH);
feat.x = getHandle(x);
feat.y = getHandle(y);
feat.score = getHandle(score);
feat.orientation = getHandle(ori);
feat.size = getHandle(size);
feat_ = getFeaturesHandle(feat);
descriptors = getHandle<float>(desc);
}
af_err af_sift(af_features* feat, af_array* desc, const af_array in, const unsigned n_layers,
const float contrast_thr, const float edge_thr, const float init_sigma,
const bool double_input, const float img_scale, const float feature_ratio)
{
try {
#ifdef AF_BUILD_SIFT
ArrayInfo info = getInfo(in);
af::dim4 dims = info.dims();
ARG_ASSERT(2, (dims[0] >= 15 && dims[1] >= 15 && dims[2] == 1 && dims[3] == 1));
ARG_ASSERT(3, n_layers > 0);
ARG_ASSERT(4, contrast_thr > 0.0f);
ARG_ASSERT(5, edge_thr >= 1.0f);
ARG_ASSERT(6, init_sigma > 0.5f);
ARG_ASSERT(8, img_scale > 0.0f);
ARG_ASSERT(9, feature_ratio > 0.0f);
dim_t in_ndims = dims.ndims();
DIM_ASSERT(1, (in_ndims <= 3 && in_ndims >= 2));
af_array tmp_desc;
af_dtype type = info.getType();
switch(type) {
case f32: sift<float , float >(*feat, tmp_desc, in, n_layers, contrast_thr,
edge_thr, init_sigma, double_input,
img_scale, feature_ratio, false); break;
case f64: sift<double, double>(*feat, tmp_desc, in, n_layers, contrast_thr,
edge_thr, init_sigma, double_input,
img_scale, feature_ratio, false); break;
default : TYPE_ERROR(1, type);
}
std::swap(*desc, tmp_desc);
#else
AF_ERROR("ArrayFire was not built with nonfree support, SIFT disabled\n", AF_ERR_NONFREE);
#endif
}
CATCHALL;
return AF_SUCCESS;
}
af_err af_gloh(af_features* feat, af_array* desc, const af_array in, const unsigned n_layers,
const float contrast_thr, const float edge_thr, const float init_sigma,
const bool double_input, const float img_scale, const float feature_ratio)
{
try {
#ifdef AF_BUILD_SIFT
ArrayInfo info = getInfo(in);
af::dim4 dims = info.dims();
ARG_ASSERT(2, (dims[0] >= 15 && dims[1] >= 15 && dims[2] == 1 && dims[3] == 1));
ARG_ASSERT(3, n_layers > 0);
ARG_ASSERT(4, contrast_thr > 0.0f);
ARG_ASSERT(5, edge_thr >= 1.0f);
ARG_ASSERT(6, init_sigma > 0.5f);
ARG_ASSERT(8, img_scale > 0.0f);
ARG_ASSERT(9, feature_ratio > 0.0f);
dim_t in_ndims = dims.ndims();
DIM_ASSERT(1, (in_ndims <= 3 && in_ndims >= 2));
af_array tmp_desc;
af_dtype type = info.getType();
switch(type) {
case f32: sift<float , float >(*feat, tmp_desc, in, n_layers, contrast_thr,
edge_thr, init_sigma, double_input,
img_scale, feature_ratio, true); break;
case f64: sift<double, double>(*feat, tmp_desc, in, n_layers, contrast_thr,
edge_thr, init_sigma, double_input,
img_scale, feature_ratio, true); break;
default : TYPE_ERROR(1, type);
}
std::swap(*desc, tmp_desc);
#else
AF_ERROR("ArrayFire was not built with nonfree support, GLOH disabled\n", AF_ERR_NONFREE);
#endif
}
CATCHALL;
return AF_SUCCESS;
}