181 lines
12 KiB
C++
181 lines
12 KiB
C++
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/*M///////////////////////////////////////////////////////////////////////////////////////
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//
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// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
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//
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// By downloading, copying, installing or using the software you agree to this license.
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// If you do not agree to this license, do not download, install,
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// copy or use the software.
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//
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//
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// License Agreement
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// For Open Source Computer Vision Library
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//
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// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
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// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
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// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
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// Copyright (C) 2014, Itseez Inc., all rights reserved.
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// Third party copyrights are property of their respective owners.
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//
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// Redistribution and use in source and binary forms, with or without modification,
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// are permitted provided that the following conditions are met:
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//
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// * Redistribution's of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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//
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// * Redistribution's in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// * The name of the copyright holders may not be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// This software is provided by the copyright holders and contributors "as is" and
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// any express or implied warranties, including, but not limited to, the implied
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// warranties of merchantability and fitness for a particular purpose are disclaimed.
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// In no event shall the Intel Corporation or contributors be liable for any direct,
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// indirect, incidental, special, exemplary, or consequential damages
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// (including, but not limited to, procurement of substitute goods or services;
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// loss of use, data, or profits; or business interruption) however caused
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// and on any theory of liability, whether in contract, strict liability,
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// or tort (including negligence or otherwise) arising in any way out of
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// the use of this software, even if advised of the possibility of such damage.
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//
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//M*/
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#ifndef OPENCV_CORE_SATURATE_HPP
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#define OPENCV_CORE_SATURATE_HPP
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#include "opencv2/core/cvdef.h"
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#include <climits>
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#include "opencv2/core/fast_math.hpp"
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namespace cv
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{
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//! @addtogroup core_utils
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//! @{
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/////////////// saturate_cast (used in image & signal processing) ///////////////////
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/** @brief Template function for accurate conversion from one primitive type to another.
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The function saturate_cast resembles the standard C++ cast operations, such as static_cast\<T\>()
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and others. It perform an efficient and accurate conversion from one primitive type to another
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(see the introduction chapter). saturate in the name means that when the input value v is out of the
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range of the target type, the result is not formed just by taking low bits of the input, but instead
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the value is clipped. For example:
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@code
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uchar a = saturate_cast<uchar>(-100); // a = 0 (UCHAR_MIN)
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short b = saturate_cast<short>(33333.33333); // b = 32767 (SHRT_MAX)
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@endcode
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Such clipping is done when the target type is unsigned char , signed char , unsigned short or
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signed short . For 32-bit integers, no clipping is done.
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When the parameter is a floating-point value and the target type is an integer (8-, 16- or 32-bit),
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the floating-point value is first rounded to the nearest integer and then clipped if needed (when
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the target type is 8- or 16-bit).
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@param v Function parameter.
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@sa add, subtract, multiply, divide, Mat::convertTo
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*/
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template<typename _Tp> static inline _Tp saturate_cast(uchar v) { return _Tp(v); }
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/** @overload */
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template<typename _Tp> static inline _Tp saturate_cast(schar v) { return _Tp(v); }
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/** @overload */
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template<typename _Tp> static inline _Tp saturate_cast(ushort v) { return _Tp(v); }
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/** @overload */
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template<typename _Tp> static inline _Tp saturate_cast(short v) { return _Tp(v); }
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/** @overload */
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template<typename _Tp> static inline _Tp saturate_cast(unsigned v) { return _Tp(v); }
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/** @overload */
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template<typename _Tp> static inline _Tp saturate_cast(int v) { return _Tp(v); }
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/** @overload */
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template<typename _Tp> static inline _Tp saturate_cast(float v) { return _Tp(v); }
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/** @overload */
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template<typename _Tp> static inline _Tp saturate_cast(double v) { return _Tp(v); }
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/** @overload */
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template<typename _Tp> static inline _Tp saturate_cast(int64 v) { return _Tp(v); }
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/** @overload */
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template<typename _Tp> static inline _Tp saturate_cast(uint64 v) { return _Tp(v); }
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template<> inline uchar saturate_cast<uchar>(schar v) { return (uchar)std::max((int)v, 0); }
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template<> inline uchar saturate_cast<uchar>(ushort v) { return (uchar)std::min((unsigned)v, (unsigned)UCHAR_MAX); }
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template<> inline uchar saturate_cast<uchar>(int v) { return (uchar)((unsigned)v <= UCHAR_MAX ? v : v > 0 ? UCHAR_MAX : 0); }
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template<> inline uchar saturate_cast<uchar>(short v) { return saturate_cast<uchar>((int)v); }
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template<> inline uchar saturate_cast<uchar>(unsigned v) { return (uchar)std::min(v, (unsigned)UCHAR_MAX); }
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template<> inline uchar saturate_cast<uchar>(float v) { int iv = cvRound(v); return saturate_cast<uchar>(iv); }
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template<> inline uchar saturate_cast<uchar>(double v) { int iv = cvRound(v); return saturate_cast<uchar>(iv); }
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template<> inline uchar saturate_cast<uchar>(int64 v) { return (uchar)((uint64)v <= (uint64)UCHAR_MAX ? v : v > 0 ? UCHAR_MAX : 0); }
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template<> inline uchar saturate_cast<uchar>(uint64 v) { return (uchar)std::min(v, (uint64)UCHAR_MAX); }
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template<> inline schar saturate_cast<schar>(uchar v) { return (schar)std::min((int)v, SCHAR_MAX); }
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template<> inline schar saturate_cast<schar>(ushort v) { return (schar)std::min((unsigned)v, (unsigned)SCHAR_MAX); }
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template<> inline schar saturate_cast<schar>(int v) { return (schar)((unsigned)(v-SCHAR_MIN) <= (unsigned)UCHAR_MAX ? v : v > 0 ? SCHAR_MAX : SCHAR_MIN); }
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template<> inline schar saturate_cast<schar>(short v) { return saturate_cast<schar>((int)v); }
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template<> inline schar saturate_cast<schar>(unsigned v) { return (schar)std::min(v, (unsigned)SCHAR_MAX); }
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template<> inline schar saturate_cast<schar>(float v) { int iv = cvRound(v); return saturate_cast<schar>(iv); }
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template<> inline schar saturate_cast<schar>(double v) { int iv = cvRound(v); return saturate_cast<schar>(iv); }
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template<> inline schar saturate_cast<schar>(int64 v) { return (schar)((uint64)((int64)v-SCHAR_MIN) <= (uint64)UCHAR_MAX ? v : v > 0 ? SCHAR_MAX : SCHAR_MIN); }
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template<> inline schar saturate_cast<schar>(uint64 v) { return (schar)std::min(v, (uint64)SCHAR_MAX); }
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template<> inline ushort saturate_cast<ushort>(schar v) { return (ushort)std::max((int)v, 0); }
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template<> inline ushort saturate_cast<ushort>(short v) { return (ushort)std::max((int)v, 0); }
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template<> inline ushort saturate_cast<ushort>(int v) { return (ushort)((unsigned)v <= (unsigned)USHRT_MAX ? v : v > 0 ? USHRT_MAX : 0); }
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template<> inline ushort saturate_cast<ushort>(unsigned v) { return (ushort)std::min(v, (unsigned)USHRT_MAX); }
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template<> inline ushort saturate_cast<ushort>(float v) { int iv = cvRound(v); return saturate_cast<ushort>(iv); }
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template<> inline ushort saturate_cast<ushort>(double v) { int iv = cvRound(v); return saturate_cast<ushort>(iv); }
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template<> inline ushort saturate_cast<ushort>(int64 v) { return (ushort)((uint64)v <= (uint64)USHRT_MAX ? v : v > 0 ? USHRT_MAX : 0); }
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template<> inline ushort saturate_cast<ushort>(uint64 v) { return (ushort)std::min(v, (uint64)USHRT_MAX); }
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template<> inline short saturate_cast<short>(ushort v) { return (short)std::min((int)v, SHRT_MAX); }
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template<> inline short saturate_cast<short>(int v) { return (short)((unsigned)(v - SHRT_MIN) <= (unsigned)USHRT_MAX ? v : v > 0 ? SHRT_MAX : SHRT_MIN); }
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template<> inline short saturate_cast<short>(unsigned v) { return (short)std::min(v, (unsigned)SHRT_MAX); }
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template<> inline short saturate_cast<short>(float v) { int iv = cvRound(v); return saturate_cast<short>(iv); }
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template<> inline short saturate_cast<short>(double v) { int iv = cvRound(v); return saturate_cast<short>(iv); }
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template<> inline short saturate_cast<short>(int64 v) { return (short)((uint64)((int64)v - SHRT_MIN) <= (uint64)USHRT_MAX ? v : v > 0 ? SHRT_MAX : SHRT_MIN); }
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template<> inline short saturate_cast<short>(uint64 v) { return (short)std::min(v, (uint64)SHRT_MAX); }
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template<> inline int saturate_cast<int>(unsigned v) { return (int)std::min(v, (unsigned)INT_MAX); }
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template<> inline int saturate_cast<int>(int64 v) { return (int)((uint64)(v - INT_MIN) <= (uint64)UINT_MAX ? v : v > 0 ? INT_MAX : INT_MIN); }
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template<> inline int saturate_cast<int>(uint64 v) { return (int)std::min(v, (uint64)INT_MAX); }
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template<> inline int saturate_cast<int>(float v) { return cvRound(v); }
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template<> inline int saturate_cast<int>(double v) { return cvRound(v); }
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template<> inline unsigned saturate_cast<unsigned>(schar v) { return (unsigned)std::max(v, (schar)0); }
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template<> inline unsigned saturate_cast<unsigned>(short v) { return (unsigned)std::max(v, (short)0); }
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template<> inline unsigned saturate_cast<unsigned>(int v) { return (unsigned)std::max(v, (int)0); }
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template<> inline unsigned saturate_cast<unsigned>(int64 v) { return (unsigned)((uint64)v <= (uint64)UINT_MAX ? v : v > 0 ? UINT_MAX : 0); }
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template<> inline unsigned saturate_cast<unsigned>(uint64 v) { return (unsigned)std::min(v, (uint64)UINT_MAX); }
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// we intentionally do not clip negative numbers, to make -1 become 0xffffffff etc.
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template<> inline unsigned saturate_cast<unsigned>(float v) { return static_cast<unsigned>(cvRound(v)); }
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template<> inline unsigned saturate_cast<unsigned>(double v) { return static_cast<unsigned>(cvRound(v)); }
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template<> inline uint64 saturate_cast<uint64>(schar v) { return (uint64)std::max(v, (schar)0); }
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template<> inline uint64 saturate_cast<uint64>(short v) { return (uint64)std::max(v, (short)0); }
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template<> inline uint64 saturate_cast<uint64>(int v) { return (uint64)std::max(v, (int)0); }
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template<> inline uint64 saturate_cast<uint64>(int64 v) { return (uint64)std::max(v, (int64)0); }
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template<> inline int64 saturate_cast<int64>(uint64 v) { return (int64)std::min(v, (uint64)LLONG_MAX); }
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/** @overload */
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template<typename _Tp> static inline _Tp saturate_cast(float16_t v) { return saturate_cast<_Tp>((float)v); }
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// in theory, we could use a LUT for 8u/8s->16f conversion,
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// but with hardware support for FP32->FP16 conversion the current approach is preferable
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template<> inline float16_t saturate_cast<float16_t>(uchar v) { return float16_t((float)v); }
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template<> inline float16_t saturate_cast<float16_t>(schar v) { return float16_t((float)v); }
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template<> inline float16_t saturate_cast<float16_t>(ushort v) { return float16_t((float)v); }
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template<> inline float16_t saturate_cast<float16_t>(short v) { return float16_t((float)v); }
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template<> inline float16_t saturate_cast<float16_t>(unsigned v){ return float16_t((float)v); }
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template<> inline float16_t saturate_cast<float16_t>(int v) { return float16_t((float)v); }
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template<> inline float16_t saturate_cast<float16_t>(uint64 v) { return float16_t((float)v); }
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template<> inline float16_t saturate_cast<float16_t>(int64 v) { return float16_t((float)v); }
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template<> inline float16_t saturate_cast<float16_t>(float v) { return float16_t(v); }
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template<> inline float16_t saturate_cast<float16_t>(double v) { return float16_t((float)v); }
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//! @}
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} // cv
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#endif // OPENCV_CORE_SATURATE_HPP
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