windowlevel calculateMinMaxMean.ts

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  function calculateMinMaxMean(pixelLuminance, globalMin, globalMax) {
  const numPixels = pixelLuminance.length;
  let min = globalMax;
  let max = globalMin;
  let sum = 0;
 
  if (numPixels < 2) {
    return {
      min,
      max,
      mean: (globalMin + globalMax) / 2,
    };
  }
 
  for (let index = 0; index < numPixels; index++) {
    const spv = pixelLuminance[index];
 
    min = Math.min(min, spv);
    max = Math.max(max, spv);
    sum += spv;
  }
 
  return {
    min,
    max,
    mean: sum / numPixels,
  };
}
 
export { calculateMinMaxMean };