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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | 24x 24x 24x 24x | import type { IImage, CPUFallbackViewport } from '../../../../types';
/**
* Computes the VOI to display all the pixels if no VOI LUT data (Window Width/Window Center or voiLUT) exists on the viewport object.
*
* @param viewport - Object containing the viewport properties
* @param image - An Image loaded by a Cornerstone Image Loader
*/
export default function computeAutoVoi(
viewport: CPUFallbackViewport,
image: IImage
): void {
Eif (hasVoi(viewport)) {
return;
}
const maxVoi = image.maxPixelValue * image.slope + image.intercept;
const minVoi = image.minPixelValue * image.slope + image.intercept;
const ww = maxVoi - minVoi;
const wc = (maxVoi + minVoi) / 2;
if (viewport.voi === undefined) {
viewport.voi = {
windowWidth: ww,
windowCenter: wc,
};
} else {
viewport.voi.windowWidth = ww;
viewport.voi.windowCenter = wc;
}
}
/**
* Check if viewport has voi LUT data
* @param viewport - The viewport to check for voi LUT data
* @returns true viewport has LUT data (Window Width/Window Center or voiLUT). Otherwise, false.
*/
function hasVoi(viewport: CPUFallbackViewport): boolean {
const hasLut =
viewport.voiLUT && viewport.voiLUT.lut && viewport.voiLUT.lut.length > 0;
return (
hasLut ||
(viewport.voi.windowWidth !== undefined &&
viewport.voi.windowCenter !== undefined)
);
}
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