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Code Issues Releases Wiki Activity

Fix bug in rgb2hsv transform

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This commit is contained in:
johan 2013-09-13 14:24:49 +02:00
parent 02fa8f5679
commit 82617dea51
1 changed files with 14 additions and 1 deletions
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15
libsrc/utils/HsvTransform.cpp
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@ -1,3 +1,4 @@
#include <iostream>
#include <utils/HsvTransform.h> #include <utils/HsvTransform.h>
HsvTransform::HsvTransform() : HsvTransform::HsvTransform() :
@ -44,6 +45,8 @@ void HsvTransform::transform(uint8_t & red, uint8_t & green, uint8_t & blue) con
uint8_t saturation, value; uint8_t saturation, value;
rgb2hsv(red, green, blue, hue, saturation, value); rgb2hsv(red, green, blue, hue, saturation, value);
std::cout << int(hue) << " " << int(saturation) << " " << int(value) << std::endl;
int s = saturation * _saturationGain; int s = saturation * _saturationGain;
if (s > 255) if (s > 255)
saturation = 255; saturation = 255;
@ -83,11 +86,21 @@ void HsvTransform::rgb2hsv(uint8_t red, uint8_t green, uint8_t blue, uint16_t &
} }
if (rgbMax == red) if (rgbMax == red)
hue = 0 + 60 * (green - blue) / (rgbMax - rgbMin); {
// start from 360 to be sure that we won't assign a negative number to the unsigned hue value
hue = 360 + 60 * (green - blue) / (rgbMax - rgbMin);
if (hue > 359)
hue -= 360;
}
else if (rgbMax == green) else if (rgbMax == green)
{
hue = 120 + 60 * (blue - red) / (rgbMax - rgbMin); hue = 120 + 60 * (blue - red) / (rgbMax - rgbMin);
}
else else
{
hue = 240 + 60 * (red - green) / (rgbMax - rgbMin); hue = 240 + 60 * (red - green) / (rgbMax - rgbMin);
}
} }
void HsvTransform::hsv2rgb(uint16_t hue, uint8_t saturation, uint8_t value, uint8_t & red, uint8_t & green, uint8_t & blue) void HsvTransform::hsv2rgb(uint16_t hue, uint8_t saturation, uint8_t value, uint8_t & red, uint8_t & green, uint8_t & blue)