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Add SVG filters to smooth spectrograms #251

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198 changes: 197 additions & 1 deletion client/src/components/geoJS/LayerManager.vue
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Original file line number Diff line number Diff line change
Expand Up @@ -748,6 +748,22 @@ export default defineComponent({

watch([backgroundColor, colorScheme], updateColorFilter);

function convMatrixFromOrder(order: number) {
let matrix = '';
for (let i = 0; i < order; i++) {
for (let j = 0; j < order; j++) {
matrix += `1${j === order - 1 ? '': ' '}`;
}
matrix += `${i === order - 1 ? '' : '\n'}`;
}
return matrix;
}

// Knobs for testing blur filters
const contrast = ref({slope: 1.2, intercept: -0.1});
const gaussianBlur = ref({ stdDeviation: 1.5 });
const convolutionMatrix = ref({ order: 5 });
Comment on lines +762 to +765
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@naglepuff naglepuff Oct 8, 2025

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For anyone interested in exploring this branch, I've added this reactive state to the component for ease of testing changes.


return {
annotationState,
localAnnotations,
Expand All @@ -757,6 +773,10 @@ export default defineComponent({
rValues,
gValues,
bValues,
contrast,
gaussianBlur,
convolutionMatrix,
convMatrixFromOrder,
};
},
});
Expand Down Expand Up @@ -796,7 +816,6 @@ export default defineComponent({
values="0"
result="grayscale"
/>

<!-- apply color scheme -->
<feComponentTransfer>
<feFuncR
Expand All @@ -813,5 +832,182 @@ export default defineComponent({
/>
</feComponentTransfer>
</filter>
<filter id="spectro-smoothing-gaussian">
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@naglepuff naglepuff Oct 8, 2025

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Note that there are now 3 separate filters with unique ids. The filter that is currently applied is determined by code in the geoJSUtils file.

<!-- convert to grayscale -->
<feColorMatrix
in="SourceGraphic"
result="grayscale"
type="saturate"
values="0"
/>
<!-- apply color scheme -->
<feComponentTransfer
in="grayscale"
out="colorscheme"
>
<feFuncR
type="table"
:tableValues="rValues"
/>
<feFuncG
type="table"
:tableValues="gValues"
/>
<feFuncB
type="table"
:tableValues="bValues"
/>
</feComponentTransfer>
<!-- Light gaussian blur -->
<feGaussianBlur
in="colorscheme"
:stdDeviation="gaussianBlur.stdDeviation"
result="blurred"
/>
<!-- increase contrast for defined edges -->
<feComponentTransfer
in="blurred"
result="contrasted"
>
<feFuncR
type="linear"
:slope="contrast.slope"
:intercept="contrast.intercept"
/>
<feFuncG
type="linear"
:slope="contrast.slope"
:intercept="contrast.intercept"
/>
<feFuncB
type="linear"
:slope="contrast.slope"
:intercept="contrast.intercept"
/>
</feComponentTransfer>
<!-- blend for even more refined edges -->
<feBlend
in="colorscheme"
in2="contrasted"
mode="overlay"
/>
</filter>
<filter id="spectro-smoothing-convo">
<!-- convert to grayscale -->
<feColorMatrix
in="SourceGraphic"
result="grayscale"
type="saturate"
values="0"
/>

<!-- apply color scheme -->
<feComponentTransfer
in="grayscale"
out="colorscheme"
>
<feFuncR
type="table"
:tableValues="rValues"
/>
<feFuncG
type="table"
:tableValues="gValues"
/>
<feFuncB
type="table"
:tableValues="bValues"
/>
</feComponentTransfer>
<!-- Use a convolution matrix to blur -->
<feConvolveMatrix
in="colorscheme"
out="blurred"
:order="convolutionMatrix.order"
:kernelMatrix="convMatrixFromOrder(convolutionMatrix.order)"
:divisor="convolutionMatrix.order ** 2"
/>
<!-- blend for even more refined edges -->
<feBlend
in="colorscheme"
in2="blurred"
mode="overlay"
/>
</filter>
<filter id="spectro-smoothing-combined">
<!-- convert to grayscale -->
<feColorMatrix
in="SourceGraphic"
result="grayscale"
type="saturate"
values="0"
/>
<!-- apply color scheme -->
<feComponentTransfer
in="grayscale"
out="colorscheme"
>
<feFuncR
type="table"
:tableValues="rValues"
/>
<feFuncG
type="table"
:tableValues="gValues"
/>
<feFuncB
type="table"
:tableValues="bValues"
/>
</feComponentTransfer>
<!-- light gaussian blur to remove pixelation -->
<feGaussianBlur
in="colorscheme"
:stdDeviation="gaussianBlur.stdDeviation"
result="gblurred"
/>
<!-- add blur via convolutional matrix -->
<feConvolveMatrix
in="gblurred"
out="mblurred"
:order="convolutionMatrix.order"
:kernelMatrix="convMatrixFromOrder(convolutionMatrix.order)"
:divisor="convolutionMatrix.order ** 2"
/>
<!-- Add contrast -->
<feComponentTransfer
in="mblurred"
out="contrasted"
result="contrasted"
>
<feFuncR
type="linear"
:slope="contrast.slope"
:intercept="contrast.intercept"
/>
<feFuncG
type="linear"
:slope="contrast.slope"
:intercept="contrast.intercept"
/>
<feFuncB
type="linear"
:slope="contrast.slope"
:intercept="contrast.intercept"
/>
</feComponentTransfer>
<!-- blend -->
<feBlend
in="SourceGraphic"
in2="contrasted"
mode="overlay"
result="blended"
/>
<!-- additional blurring? -->
<feGaussianBlur
in="blended"
stdDeviation="0.4"
/>
</filter>
</svg>
</template>
5 changes: 4 additions & 1 deletion client/src/components/geoJS/geoJSUtils.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -121,7 +121,10 @@ const useGeoJS = () => {
});
}
clearQuadFeatures();
quadFeatureLayer.node().css("filter", "url(#apply-color-scheme)");
// quadFeatureLayer.node().css("filter", "url(#apply-color-scheme)");
// quadFeatureLayer.node().css("filter", "url(#spectro-smoothing-gaussian)");
// quadFeatureLayer.node().css("filter", "url(#spectro-smoothing-convo)");
quadFeatureLayer.node().css("filter", "url(#spectro-smoothing-combined)");
Comment on lines +124 to +127
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@naglepuff naglepuff Oct 8, 2025

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Commented-out lines here refer to other filters. Currently the filter combines both techniques (gaussian blur and convolution matrix). For those interested, you can pick a different filter to use to compare.

for (let i = 0; i < imageCount; i += 1) {
quadFeatures.push(quadFeatureLayer.createFeature("quad"));
}
Expand Down