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Expose libvips' median filter operation (#1161)

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This commit is contained in:
Andrea Bianco
2018-03-17 11:52:44 +01:00
committed by Lovell Fuller
parent f880adbaac
commit 875937e3d8
12 changed files with 105 additions and 1 deletions
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8
src/pipeline.cc
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@@ -359,6 +359,8 @@ class PipelineWorker : public Nan::AsyncWorker {
bool const shouldBlur = baton->blurSigma != 0.0;
bool const shouldConv = baton->convKernelWidth * baton->convKernelHeight > 0;
bool const shouldSharpen = baton->sharpenSigma != 0.0;
bool const shouldApplyMedian = baton->medianSize > 0;
bool const shouldPremultiplyAlpha = HasAlpha(image) &&
(shouldResize || shouldBlur || shouldConv || shouldSharpen || shouldOverlayWithAlpha);
@@ -544,7 +546,10 @@ class PipelineWorker : public Nan::AsyncWorker {
image = image.embed(baton->extendLeft, baton->extendTop, baton->width, baton->height,
VImage::option()->set("extend", VIPS_EXTEND_BACKGROUND)->set("background", background));
}
// Median - must happen before blurring, due to the utility of blurring after thresholding
if (shouldApplyMedian) {
image = image.median(baton->medianSize);
}
// Threshold - must happen before blurring, due to the utility of blurring after thresholding
if (baton->threshold != 0) {
image = sharp::Threshold(image, baton->threshold, baton->thresholdGrayscale);
@@ -1194,6 +1199,7 @@ NAN_METHOD(pipeline) {
baton->flatten = AttrTo<bool>(options, "flatten");
baton->negate = AttrTo<bool>(options, "negate");
baton->blurSigma = AttrTo<double>(options, "blurSigma");
baton->medianSize = AttrTo<uint32_t>(options, "medianSize");
baton->sharpenSigma = AttrTo<double>(options, "sharpenSigma");
baton->sharpenFlat = AttrTo<double>(options, "sharpenFlat");
baton->sharpenJagged = AttrTo<double>(options, "sharpenJagged");

2
src/pipeline.h
View File

@@ -73,6 +73,7 @@ struct PipelineBaton {
bool flatten;
bool negate;
double blurSigma;
int medianSize;
double sharpenSigma;
double sharpenFlat;
double sharpenJagged;
@@ -157,6 +158,7 @@ struct PipelineBaton {
flatten(false),
negate(false),
blurSigma(0.0),
medianSize(0),
sharpenSigma(0.0),
sharpenFlat(1.0),
sharpenJagged(2.0),