Sergey Sharybin
870dba7657
Screens are usually doesn't have overexposured pixels and all saturation / gradient math was written assuming that all channels are withing 0 .. 1 range and in cases when some channel exceeds this range matte could be completely wrong. Added special check for overesposure and assume such pixels as definitely foreground. Also fixed minimal value for edge kernel size.
151 lines
4.4 KiB
C++
151 lines
4.4 KiB
C++
/*
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* Copyright 2012, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Contributor:
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* Jeroen Bakker
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* Monique Dewanchand
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* Sergey Sharybin
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*/
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#include "COM_KeyingOperation.h"
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#include "MEM_guardedalloc.h"
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#include "BLI_listbase.h"
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#include "BLI_math.h"
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static int get_pixel_primary_channel(float pixelColor[4])
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{
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float max_value = MAX3(pixelColor[0], pixelColor[1], pixelColor[2]);
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if (max_value == pixelColor[0])
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return 0;
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else if (max_value == pixelColor[1])
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return 1;
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return 2;
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}
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static float get_pixel_saturation(float pixelColor[4], float screen_balance, int primary_channel)
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{
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int other_1 = (primary_channel + 1) % 3;
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int other_2 = (primary_channel + 2) % 3;
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float min = MIN2(pixelColor[other_1], pixelColor[other_2]);
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float max = MAX2(pixelColor[other_1], pixelColor[other_2]);
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float val = screen_balance * min + (1.0f - screen_balance) * max;
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return (pixelColor[primary_channel] - val) * fabsf(1.0f - val);
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}
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KeyingOperation::KeyingOperation() : NodeOperation()
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{
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this->addInputSocket(COM_DT_COLOR);
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this->addInputSocket(COM_DT_COLOR);
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this->addInputSocket(COM_DT_VALUE);
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this->addInputSocket(COM_DT_VALUE);
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this->addOutputSocket(COM_DT_VALUE);
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this->screenBalance = 0.5f;
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this->pixelReader = NULL;
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this->screenReader = NULL;
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this->garbageReader = NULL;
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this->coreReader = NULL;
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}
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void KeyingOperation::initExecution()
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{
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this->pixelReader = this->getInputSocketReader(0);
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this->screenReader = this->getInputSocketReader(1);
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this->garbageReader = this->getInputSocketReader(2);
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this->coreReader = this->getInputSocketReader(3);
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}
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void KeyingOperation::deinitExecution()
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{
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this->pixelReader = NULL;
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this->screenReader = NULL;
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this->garbageReader = NULL;
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this->coreReader = NULL;
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}
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void KeyingOperation::executePixel(float *color, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[])
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{
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float pixelColor[4];
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float screenColor[4];
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float garbageValue[4];
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float coreValue[4];
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this->pixelReader->read(pixelColor, x, y, sampler, inputBuffers);
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this->screenReader->read(screenColor, x, y, sampler, inputBuffers);
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this->garbageReader->read(garbageValue, x, y, sampler, inputBuffers);
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this->coreReader->read(coreValue, x, y, sampler, inputBuffers);
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int primary_channel = get_pixel_primary_channel(screenColor);
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if (pixelColor[primary_channel] > 1.0f) {
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/* overexposure doesn't happen on screen itself and usually happens
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* on light sources in the shot, this need to be checked separately
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* because saturation and falloff calculation is based on the fact
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* that pixels are not overexposured
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*/
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color[0] = 1.0f;
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}
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else {
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float saturation = get_pixel_saturation(pixelColor, this->screenBalance, primary_channel);
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float screen_saturation = get_pixel_saturation(screenColor, this->screenBalance, primary_channel);
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if (saturation < 0) {
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/* means main channel of pixel is different from screen,
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* assume this is completely a foreground
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*/
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color[0] = 1.0f;
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}
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else if (saturation >= screen_saturation) {
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/* matched main channels and higher saturation on pixel
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* is treated as completely background
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*/
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color[0] = 0.0f;
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}
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else {
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/* nice alpha falloff on edges */
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float distance = 1.0f - saturation / screen_saturation;
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color[0] = distance;
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}
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}
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/* apply garbage matte */
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color[0] = MIN2(color[0], 1.0f - garbageValue[0]);
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/* apply core matte */
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color[0] = MAX2(color[0], coreValue[0]);
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}
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bool KeyingOperation::determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output)
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{
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rcti newInput;
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newInput.xmin = 0;
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newInput.ymin = 0;
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newInput.xmax = this->getWidth();
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newInput.ymax = this->getHeight();
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return NodeOperation::determineDependingAreaOfInterest(&newInput, readOperation, output);
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}
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