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+/*
+ * Copyright (c) 2016-2020 Arm Limited.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef ARM_COMPUTE_NEHOGDETECTORKERNEL_H
+#define ARM_COMPUTE_NEHOGDETECTORKERNEL_H
+
+#include "arm_compute/core/IArray.h"
+#include "arm_compute/core/IHOG.h"
+#include "src/core/NEON/INEKernel.h"
+#include "support/Mutex.h"
+
+namespace arm_compute
+{
+class ITensor;
+
+/** NEON kernel to perform HOG detector kernel using linear SVM */
+class NEHOGDetectorKernel : public INEKernel
+{
+public:
+ const char *name() const override
+ {
+ return "NEHOGDetectorKernel";
+ }
+ /** Default constructor */
+ NEHOGDetectorKernel();
+ /** Prevent instances of this class from being copied (As this class contains pointers) */
+ NEHOGDetectorKernel(const NEHOGDetectorKernel &) = delete;
+ /** Prevent instances of this class from being copied (As this class contains pointers) */
+ NEHOGDetectorKernel &operator=(const NEHOGDetectorKernel &) = delete;
+ /** Prevent instances of this class from being moved (As this class contains non movable objects) */
+ NEHOGDetectorKernel(NEHOGDetectorKernel &&) = delete;
+ /** Prevent instances of this class from being moved (As this class contains non movable objects) */
+ NEHOGDetectorKernel &operator=(NEHOGDetectorKernel &&) = delete;
+ /** Default destructor */
+ ~NEHOGDetectorKernel() = default;
+
+ /** Initialise the kernel's input, HOG data-object, detection window, the stride of the detection window, the threshold and index of the object to detect
+ *
+ * @param[in] input Input tensor which stores the HOG descriptor obtained with @ref NEHOGOrientationBinningKernel. Data type supported: F32. Number of channels supported: equal to the number of histogram bins per block
+ * @param[in] hog HOG data object used by @ref NEHOGOrientationBinningKernel and @ref NEHOGBlockNormalizationKernel
+ * @param[out] detection_windows Array of @ref DetectionWindow. This array stores all the detected objects
+ * @param[in] detection_window_stride Distance in pixels between 2 consecutive detection windows in x and y directions.
+ * It must be multiple of the hog->info()->block_stride()
+ * @param[in] threshold (Optional) Threshold for the distance between features and SVM classifying plane
+ * @param[in] idx_class (Optional) Index of the class used for evaluating which class the detection window belongs to
+ */
+ void configure(const ITensor *input, const IHOG *hog, IDetectionWindowArray *detection_windows, const Size2D &detection_window_stride, float threshold = 0.0f, uint16_t idx_class = 0);
+
+ // Inherited methods overridden:
+ void run(const Window &window, const ThreadInfo &info) override;
+
+private:
+ const ITensor *_input;
+ IDetectionWindowArray *_detection_windows;
+ const float *_hog_descriptor;
+ float _bias;
+ float _threshold;
+ uint16_t _idx_class;
+ size_t _num_bins_per_descriptor_x;
+ size_t _num_blocks_per_descriptor_y;
+ size_t _block_stride_width;
+ size_t _block_stride_height;
+ size_t _detection_window_width;
+ size_t _detection_window_height;
+ size_t _max_num_detection_windows;
+ arm_compute::Mutex _mutex;
+};
+} // namespace arm_compute
+#endif /* ARM_COMPUTE_NEHOGDETECTORKERNEL_H */