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Expose libvips gaussnoise operation (#2527)

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This commit is contained in:
alza54
2021-01-16 15:03:25 +01:00
committed by GitHub
parent 419cbe50f6
commit c9f85fe27f
6 changed files with 343 additions and 21 deletions
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44
src/common.cc
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@@ -109,7 +109,13 @@ namespace sharp {
descriptor->createChannels = AttrAsUint32(input, "createChannels");
descriptor->createWidth = AttrAsUint32(input, "createWidth");
descriptor->createHeight = AttrAsUint32(input, "createHeight");
descriptor->createBackground = AttrAsVectorOfDouble(input, "createBackground");
if (HasAttr(input, "createNoiseType")) {
descriptor->createNoiseType = AttrAsStr(input, "createNoiseType");
descriptor->createNoiseMean = AttrAsDouble(input, "createNoiseMean");
descriptor->createNoiseSigma = AttrAsDouble(input, "createNoiseSigma");
} else {
descriptor->createBackground = AttrAsVectorOfDouble(input, "createBackground");
}
}
// Limit input images to a given number of pixels, where pixels = width * height
descriptor->limitInputPixels = AttrAsUint32(input, "limitInputPixels");
@@ -318,15 +324,35 @@ namespace sharp {
} else {
if (descriptor->createChannels > 0) {
// Create new image
std::vector<double> background = {
descriptor->createBackground[0],
descriptor->createBackground[1],
descriptor->createBackground[2]
};
if (descriptor->createChannels == 4) {
background.push_back(descriptor->createBackground[3]);
if (descriptor->createNoiseType == "gaussian") {
int const channels = descriptor->createChannels;
image = VImage::new_matrix(descriptor->createWidth, descriptor->createHeight);
std::vector<VImage> bands = {};
bands.reserve(channels);
for (int _band = 0; _band < channels; _band++) {
bands.push_back(image.gaussnoise(
descriptor->createWidth,
descriptor->createHeight,
VImage::option()->set("mean", descriptor->createNoiseMean)->set("sigma", descriptor->createNoiseSigma)));
}
image = image.bandjoin(bands);
image = image.cast(VipsBandFormat::VIPS_FORMAT_UCHAR);
if (channels < 3) {
image = image.colourspace(VIPS_INTERPRETATION_B_W);
} else {
image = image.colourspace(VIPS_INTERPRETATION_sRGB);
}
} else {
std::vector<double> background = {
descriptor->createBackground[0],
descriptor->createBackground[1],
descriptor->createBackground[2]
};
if (descriptor->createChannels == 4) {
background.push_back(descriptor->createBackground[3]);
}
image = VImage::new_matrix(descriptor->createWidth, descriptor->createHeight).new_from_image(background);
}
image = VImage::new_matrix(descriptor->createWidth, descriptor->createHeight).new_from_image(background);
image.get_image()->Type = VIPS_INTERPRETATION_sRGB;
imageType = ImageType::RAW;
} else {