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Only use center of V4L2 grabbed image to determine if there is a signal to allow some noise at the borders 

Former-commit-id: f0c1920666297e06c9d29ef0128e0d3340851251
This commit is contained in:
johan 2014-03-22 15:41:52 +01:00
parent 6fafb23a3f
commit 40185e3c7c
1 changed files with 16 additions and 2 deletions
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18
libsrc/grabber/v4l2/V4L2Grabber.cpp
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@ -96,6 +96,8 @@ void V4L2Grabber::setSignalThreshold(double redSignalThreshold, double greenSign
_noSignalThresholdColor.green = uint8_t(255*greenSignalThreshold);
_noSignalThresholdColor.blue = uint8_t(255*blueSignalThreshold);
_noSignalCounterThreshold = std::max(1, noSignalCounterThreshold);
std::cout << "V4L2 grabber signal threshold set to: " << _noSignalThresholdColor << std::endl;
}
void V4L2Grabber::start()
@ -674,8 +676,6 @@ void V4L2Grabber::process_image(const uint8_t * data)
int outputHeight = (height - _cropTop - _cropBottom + _verticalPixelDecimation/2) / _verticalPixelDecimation;
Image<ColorRgb> image(outputWidth, outputHeight);
bool noSignal = true;
for (int ySource = _cropTop + _verticalPixelDecimation/2, yDest = 0; ySource < height - _cropBottom; ySource += _verticalPixelDecimation, ++yDest)
{
for (int xSource = _cropLeft + _horizontalPixelDecimation/2, xDest = 0; xSource < width - _cropRight; xSource += _horizontalPixelDecimation, ++xDest)
@ -701,6 +701,20 @@ void V4L2Grabber::process_image(const uint8_t * data)
ColorRgb & rgb = image(xDest, yDest);
yuv2rgb(y, u, v, rgb.red, rgb.green, rgb.blue);
}
}
// check signal (only in center of the resulting image, because some grabbers have noise values along the borders)
bool noSignal = true;
for (unsigned x = 0; noSignal && x < (image.width()>>1); ++x)
{
int xImage = (image.width()>>2) + x;
for (unsigned y = 0; noSignal && y < (image.height()>>1); ++y)
{
int yImage = (image.height()>>2) + y;
ColorRgb & rgb = image(xImage, yImage);
noSignal &= rgb <= _noSignalThresholdColor;
}
}