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improved yuv->rgb convertation speed

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This commit is contained in:
marcel 2014-07-02 19:01:00 +02:00
parent b8500006ef
commit 2cabecde82
1 changed files with 36 additions and 22 deletions
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58
widget/camera.cpp
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@ -4,19 +4,35 @@
#include <QVideoEncoderSettings>
#include <QVideoEncoderSettingsControl>
static inline float getR(int Y, int V)
static inline void fromYCbCrToRGB(
uint8_t Y, uint8_t Cb, uint8_t Cr,
uint8_t& R, uint8_t& G, uint8_t& B)
{
return qMax(qMin((int)(1.164*(Y - 16) + 1.596*(V - 128)),255),0);
}
int r = Y + ((1436 * (Cr - 128)) >> 10),
g = Y - ((354 * (Cb - 128) + 732 * (Cr - 128)) >> 10),
b = Y + ((1814 * (Cb - 128)) >> 10);
static inline float getG(int Y, int U, int V)
{
return qMax(qMin((int)(1.164*(Y - 16) - 0.813*(V - 128) - 0.391*(U - 128)),255),0);
}
if(r < 0) {
r = 0;
} else if(r > 255) {
r = 255;
}
static inline float getB(int Y, int U)
{
return qMax(qMin((int)(1.164*(Y - 16) + 2.018*(U - 128)),255),0);
if(g < 0) {
g = 0;
} else if(g > 255) {
g = 255;
}
if(b < 0) {
b = 0;
} else if(b > 255) {
b = 255;
}
R = static_cast<uint8_t>(r);
G = static_cast<uint8_t>(g);
B = static_cast<uint8_t>(b);
}
Camera::Camera()
@ -155,13 +171,12 @@ QImage Camera::getLastImage()
uint32_t* scanline = (uint32_t*)img.scanLine(i);
for (int j=0; j < bpl; j++)
{
int Y = yData[i*bpl + j];
int U = uData[i/2*cxbpl + j/2];
int V = vData[i/2*cxbpl + j/2];
uint8_t Y = yData[i*bpl + j];
uint8_t U = uData[i/2*cxbpl + j/2];
uint8_t V = vData[i/2*cxbpl + j/2];
uint8_t R = getR(Y,V);
uint8_t G = getG(Y,U,V);
uint8_t B = getB(Y,U);
uint8_t R, G, B;
fromYCbCrToRGB(Y, U, V, R, G, B);
scanline[j] = (0xFF<<24) + (R<<16) + (G<<8) + B;
}
@ -177,13 +192,12 @@ QImage Camera::getLastImage()
uint32_t* scanline = (uint32_t*)img.scanLine(i);
for (int j=0; j < bpl; j++)
{
int Y = yData[i*bpl + j];
int U = uData[i/2*cxbpl + j/2];
int V = vData[i/2*cxbpl + j/2];
uint8_t Y = yData[i*bpl + j];
uint8_t U = uData[i/2*cxbpl + j/2];
uint8_t V = vData[i/2*cxbpl + j/2];
uint8_t R = getR(Y,V);
uint8_t G = getG(Y,U,V);
uint8_t B = getB(Y,U);
uint8_t R, G, B;
fromYCbCrToRGB(Y, U, V, R, G, B);
scanline[j] = (0xFF<<24) + (R<<16) + (G<<8) + B;
}