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100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
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/* ----------------------------------------------------------------------
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* Project: CMSIS DSP Library
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* Title: arm_correlation_distance_f16.c
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* Description: Correlation distance between two vectors
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*
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* $Date: 23 April 2021
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* $Revision: V1.9.0
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*
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* Target Processor: Cortex-M and Cortex-A cores
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* -------------------------------------------------------------------- */
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/*
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* Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an AS IS BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "dsp/distance_functions_f16.h"
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#if defined(ARM_FLOAT16_SUPPORTED)
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#include <limits.h>
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#include <math.h>
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/**
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@ingroup FloatDist
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*/
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/**
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@defgroup Correlation Correlation distance
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Correlation distance
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*/
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/**
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@addtogroup Correlation
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@{
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*/
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/**
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* @brief Correlation distance between two vectors
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*
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* The input vectors are modified in place !
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*
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* @param[in] pA First vector
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* @param[in] pB Second vector
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* @param[in] blockSize vector length
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* @return distance
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*
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*/
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float16_t arm_correlation_distance_f16(float16_t *pA,float16_t *pB, uint32_t blockSize)
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{
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float16_t ma,mb,pwra,pwrb,dot,tmp;
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arm_mean_f16(pA, blockSize, &ma);
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arm_mean_f16(pB, blockSize, &mb);
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arm_offset_f16(pA, -(_Float16)ma, pA, blockSize);
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arm_offset_f16(pB, -(_Float16)mb, pB, blockSize);
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arm_power_f16(pA, blockSize, &pwra);
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arm_power_f16(pB, blockSize, &pwrb);
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arm_dot_prod_f16(pA,pB,blockSize,&dot);
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dot = (_Float16)dot / (_Float16)blockSize;
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pwra = (_Float16)pwra / (_Float16)blockSize;
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pwrb = (_Float16)pwrb / (_Float16)blockSize;
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arm_sqrt_f16((_Float16)pwra * (_Float16)pwrb,&tmp);
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return(1.0f16 - (_Float16)dot / (_Float16)tmp);
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}
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/**
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* @} end of Correlation group
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*/
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#endif /* #if defined(ARM_FLOAT16_SUPPORTED) */
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