generic-library/opencv
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Android native camera is updated to support RGBA output

Browse Source
This commit is contained in:
Andrey Kamaev 2011-06-06 08:52:51 +00:00
parent 3df5f5e13a
commit 3956f54040
2 changed files with 22 additions and 94 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
modules/highgui/include/opencv2/highgui/highgui_c.h
View File

@ -392,9 +392,12 @@ enum
//supported by Android camera output formats //supported by Android camera output formats
enum enum
{ {
CV_CAP_ANDROID_COLOR_FRAME = 0, //BGR CV_CAP_ANDROID_COLOR_FRAME_BGR = 0, //BGR
CV_CAP_ANDROID_COLOR_FRAME = CV_CAP_ANDROID_COLOR_FRAME_BGR,
CV_CAP_ANDROID_GREY_FRAME = 1, //Y CV_CAP_ANDROID_GREY_FRAME = 1, //Y
CV_CAP_ANDROID_COLOR_FRAME_RGB = 2 //RGB CV_CAP_ANDROID_COLOR_FRAME_RGB = 2,
CV_CAP_ANDROID_COLOR_FRAME_BGRA = 3,
CV_CAP_ANDROID_COLOR_FRAME_RGBA = 4
}; };
/* retrieve or set capture properties */ /* retrieve or set capture properties */

109
modules/highgui/src/cap_android.cpp
View File

@ -119,7 +119,7 @@ private:
void prepareCacheForYUV420i(int width, int height); void prepareCacheForYUV420i(int width, int height);
static bool convertYUV420i2Grey(int width, int height, const unsigned char* yuv, cv::Mat& resmat); static bool convertYUV420i2Grey(int width, int height, const unsigned char* yuv, cv::Mat& resmat);
static bool convertYUV420i2BGR888(int width, int height, const unsigned char* yuv, cv::Mat& resmat, bool inRGBorder); static bool convertYUV420i2BGR(int width, int height, const unsigned char* yuv, cv::Mat& resmat, bool inRGBorder, bool withAlpha);
friend class HighguiAndroidCameraActivity; friend class HighguiAndroidCameraActivity;
}; };
@ -354,21 +354,21 @@ IplImage* CvCapture_Android::retrieveFrame( int outputType )
{ {
switch(outputType) switch(outputType)
{ {
case CV_CAP_ANDROID_COLOR_FRAME:
if (!m_hasColor)
if (!(m_hasColor = convertYUV420i2BGR888(m_width, m_height, current_frameYUV420i, m_frameColor.mat, false)))
return NULL;
image = m_frameColor.getIplImagePtr();
break;
case CV_CAP_ANDROID_GREY_FRAME: case CV_CAP_ANDROID_GREY_FRAME:
if (!m_hasGray) if (!m_hasGray)
if (!(m_hasGray = convertYUV420i2Grey(m_width, m_height, current_frameYUV420i, m_frameGray.mat))) if (!(m_hasGray = convertYUV420i2Grey(m_width, m_height, current_frameYUV420i, m_frameGray.mat)))
return NULL; return NULL;
image = m_frameGray.getIplImagePtr(); image = m_frameGray.getIplImagePtr();
break; break;
case CV_CAP_ANDROID_COLOR_FRAME_RGB: case CV_CAP_ANDROID_COLOR_FRAME_BGR: case CV_CAP_ANDROID_COLOR_FRAME_RGB:
if (!m_hasColor) if (!m_hasColor)
if (!(m_hasColor = convertYUV420i2BGR888(m_width, m_height, current_frameYUV420i, m_frameColor.mat, true))) if (!(m_hasColor = convertYUV420i2BGR(m_width, m_height, current_frameYUV420i, m_frameColor.mat, outputType == CV_CAP_ANDROID_COLOR_FRAME_RGB, false)))
return NULL;
image = m_frameColor.getIplImagePtr();
break;
case CV_CAP_ANDROID_COLOR_FRAME_BGRA: case CV_CAP_ANDROID_COLOR_FRAME_RGBA:
if (!m_hasColor)
if (!(m_hasColor = convertYUV420i2BGR(m_width, m_height, current_frameYUV420i, m_frameColor.mat, outputType == CV_CAP_ANDROID_COLOR_FRAME_RGBA, true)))
return NULL; return NULL;
image = m_frameColor.getIplImagePtr(); image = m_frameColor.getIplImagePtr();
break; break;
@ -439,103 +439,28 @@ void CvCapture_Android::prepareCacheForYUV420i(int width, int height)
} }
} }
inline unsigned char clamp(int value)
{
if (value <= 0)
return 0;
if (value >= 255)
return (unsigned char)255;
return (unsigned char)value;
}
bool CvCapture_Android::convertYUV420i2Grey(int width, int height, const unsigned char* yuv, cv::Mat& resmat) bool CvCapture_Android::convertYUV420i2Grey(int width, int height, const unsigned char* yuv, cv::Mat& resmat)
{ {
if (yuv == 0) return false; if (yuv == 0) return false;
#define ALWAYS_COPY_GRAY 0
#if ALWAYS_COPY_GRAY
resmat.create(height, width, CV_8UC1); resmat.create(height, width, CV_8UC1);
unsigned char* matBuff = resmat.ptr<unsigned char> (0); unsigned char* matBuff = resmat.ptr<unsigned char> (0);
memcpy(matBuff, yuv, width * height); memcpy(matBuff, yuv, width * height);
#else
resmat = cv::Mat(height, width, CV_8UC1, (void*)yuv);
#endif
return !resmat.empty(); return !resmat.empty();
} }
template<int R> bool CvCapture_Android::convertYUV420i2BGR(int width, int height, const unsigned char* yuv, cv::Mat& resmat, bool inRGBorder, bool withAlpha)
struct YUV420i2BGR888Invoker
{
cv::Mat& dst;
unsigned char* my1, *muv;
int width;
YUV420i2BGR888Invoker(cv::Mat& _dst, int _width, unsigned char* _y1, unsigned char* _uv)
: dst(_dst), my1(_y1), muv(_uv), width(_width) {}
void operator()(const cv::BlockedRange& range) const
{
//B = 1.164(Y - 16) + 2.018(U - 128)
//G = 1.164(Y - 16) - 0.813(V - 128) - 0.391(U - 128)
//R = 1.164(Y - 16) + 1.596(V - 128)
unsigned char* y1 = my1 + range.begin() * width, *uv = muv + range.begin() * width / 2;
for (int j = range.begin(); j < range.end(); j+=2, y1+=width*2, uv+=width)
{
unsigned char* row1 = dst.ptr<unsigned char>(j);
unsigned char* row2 = dst.ptr<unsigned char>(j+1);
unsigned char* y2 = y1 + width;
for(int i = 0; i < width; i+=2,row1+=6,row2+=6)
{
int cr = uv[i] - 128;
int cb = uv[i+1] - 128;
int ruv = 409 * cr + 128;
int guv = 128 - 100 * cb - 208 * cr;
int buv = 516 * cb + 128;
int y00 = (y1[i] - 16) * 298;
row1[0+R] = clamp((y00 + buv) >> 8);
row1[1] = clamp((y00 + guv) >> 8);
row1[2-R] = clamp((y00 + ruv) >> 8);
int y01 = (y1[i+1] - 16) * 298;
row1[3+R] = clamp((y01 + buv) >> 8);
row1[4] = clamp((y01 + guv) >> 8);
row1[5-R] = clamp((y01 + ruv) >> 8);
int y10 = (y2[i] - 16) * 298;
row2[0+R] = clamp((y10 + buv) >> 8);
row2[1] = clamp((y10 + guv) >> 8);
row2[2-R] = clamp((y10 + ruv) >> 8);
int y11 = (y2[i+1] - 16) * 298;
row2[3+R] = clamp((y11 + buv) >> 8);
row2[4] = clamp((y11 + guv) >> 8);
row2[5-R] = clamp((y11 + ruv) >> 8);
}
}
}
};
bool CvCapture_Android::convertYUV420i2BGR888(int width, int height, const unsigned char* yuv, cv::Mat& resmat, bool inRGBorder)
{ {
if (yuv == 0) return false; if (yuv == 0) return false;
CV_Assert(width % 2 == 0 && height % 2 == 0); CV_Assert(width % 2 == 0 && height % 2 == 0);
resmat.create(height, width, CV_8UC3); cv::Mat src(height*3/2, width, CV_8UC1, (void*)yuv);
unsigned char* y1 = (unsigned char*)yuv; cv::cvtColor(src, resmat, inRGBorder ? CV_YUV420i2RGB : CV_YUV420i2BGR, withAlpha ? 4 : 3);
unsigned char* uv = y1 + width * height;
#ifdef HAVE_TEGRA_OPTIMIZATION
#warning "TEGRA OPTIMIZED YUV420i TO RGB888 CONVERSION IS USED"
if (!tegra::YUV420i2BGR888(width, height, y1, uv, resmat, inRGBorder))
#endif
{
if (inRGBorder)
cv::parallel_for(cv::BlockedRange(0, height, 2), YUV420i2BGR888Invoker<2>(resmat, width, y1, uv));
else
cv::parallel_for(cv::BlockedRange(0, height, 2), YUV420i2BGR888Invoker<0>(resmat, width, y1, uv));
}
return !resmat.empty(); return !resmat.empty();
} }