COMPMID-344 Updated doxygen

Change-Id: I32f7b84daa560e460b77216add529c8fa8b327ae
diff --git a/arm_compute/runtime/NEON/functions/NEHOGGradient.h b/arm_compute/runtime/NEON/functions/NEHOGGradient.h
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+/*
+ * Copyright (c) 2016, 2017 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_NEHOGGRADIENT_H__
+#define __ARM_COMPUTE_NEHOGGRADIENT_H__
+
+#include "arm_compute/core/NEON/INEKernel.h"
+#include "arm_compute/core/Types.h"
+#include "arm_compute/runtime/IFunction.h"
+#include "arm_compute/runtime/NEON/functions/NEDerivative.h"
+#include "arm_compute/runtime/Tensor.h"
+
+#include <cstdint>
+#include <memory>
+
+namespace arm_compute
+{
+class ITensor;
+/** Basic function to calculate the gradient for HOG. This function calls the following NEON kernels:
+ *
+ * -# @ref NEDerivative
+ * -# NEMagnitudePhaseKernel
+ *
+ */
+class NEHOGGradient : public IFunction
+{
+public:
+    /** Default constructor */
+    NEHOGGradient();
+    /** Initialise the function's source, destinations, phase type and border mode
+     *
+     * @param[in, out] input                 Input tensor. Data type supported: U8.
+     *                                       (Written to only for @p border_mode != UNDEFINED)
+     * @param[out]     output_magnitude      Output tensor (magnitude). Data type supported: U16.
+     * @param[out]     output_phase          Output tensor.(phase). Format supported: U8
+     * @param[in]      phase_type            Type of @ref PhaseType
+     * @param[in]      border_mode           Border mode to use
+     * @param[in]      constant_border_value (Optional) Constant value to use for borders if border_mode is set to CONSTANT.
+     */
+    void configure(ITensor *input, ITensor *output_magnitude, ITensor *output_phase, PhaseType phase_type, BorderMode border_mode, uint8_t constant_border_value = 0);
+
+    // Inherited method overridden:
+    void run() override;
+
+private:
+    NEDerivative               _derivative;
+    std::unique_ptr<INEKernel> _mag_phase;
+    Tensor                     _gx;
+    Tensor                     _gy;
+};
+}
+#endif /*__ARM_COMPUTE_NEHOGGRADIENT_H__ */