cornerstone-wado-image-loader
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Cornerstone Image Loader for DICOM WADO-URI and WADO-RS
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<h2><a href="index.html">Home</a></h2><h3>Global</h3><ul><li><a href="global.html#addTask">addTask</a></li><li><a href="global.html#arrayBufferToString">arrayBufferToString</a></li><li><a href="global.html#cacheSizeInBytes">cacheSizeInBytes</a></li><li><a href="global.html#cancelTask">cancelTask</a></li><li><a href="global.html#decodeAsync">decodeAsync</a></li><li><a href="global.html#framesAreFragmented">framesAreFragmented</a></li><li><a href="global.html#getMinMax">getMinMax</a></li><li><a href="global.html#getNumberString">getNumberString</a></li><li><a href="global.html#getNumberValues">getNumberValues</a></li><li><a href="global.html#getStatistics">getStatistics</a></li><li><a href="global.html#getTransferSyntaxForContentType">getTransferSyntaxForContentType</a></li><li><a href="global.html#getUncompressedImageFrame">getUncompressedImageFrame</a></li><li><a href="global.html#getValue">getValue</a></li><li><a href="global.html#handleMessageFromWorker">handleMessageFromWorker</a></li><li><a href="global.html#handler">handler</a></li><li><a href="global.html#initialize">initialize</a></li><li><a href="global.html#loadCodecs">loadCodecs</a></li><li><a href="global.html#loadWebWorkerTask">loadWebWorkerTask</a></li><li><a href="global.html#registerLoaders">registerLoaders</a></li><li><a href="global.html#registerTaskHandler">registerTaskHandler</a></li><li><a href="global.html#setPixelDataType">setPixelDataType</a></li><li><a href="global.html#setTaskPriority">setTaskPriority</a></li><li><a href="global.html#spawnWebWorker">spawnWebWorker</a></li><li><a href="global.html#startTaskOnWebWorker">startTaskOnWebWorker</a></li><li><a href="global.html#terminate">terminate</a></li><li><a href="global.html#unpackBinaryFrame">unpackBinaryFrame</a></li></ul>
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<h1 class="page-title">imageLoader/wadouri/getUncompressedImageFrame.js</h1>
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<pre class="prettyprint source linenums"><code>import unpackBinaryFrame from './unpackBinaryFrame.js';
/**
* Function to deal with extracting an image frame from an encapsulated data set.
*/
function getUncompressedImageFrame(dataSet, frameIndex) {
const pixelDataElement =
dataSet.elements.x7fe00010 || dataSet.elements.x7fe00008;
const bitsAllocated = dataSet.uint16('x00280100');
const rows = dataSet.uint16('x00280010');
const columns = dataSet.uint16('x00280011');
let samplesPerPixel = dataSet.uint16('x00280002');
/**
* From: http://dicom.nema.org/medical/dicom/current/output/chtml/part03/sect_C.7.6.3.html
*
* Though the chrominance channels are downsampled, there are still nominally
* three channels, hence Samples per Pixel (0028,0002) has a value of 3, not
* 2. I.e., for pixel data in a Native (uncompressed) format, the Value Length
* of Pixel Data (7FE0,0010) is not:
*
* Rows (0028,0010) * Columns (0028,0011) * Number of Frames (0028,0008) *
* Samples per Pixel (0028,0002) * (⌊(Bits Allocated (0028,0100)-1)/8⌋+1)
*
* padded to an even length, as it would otherwise be, but rather is:
*
* Rows (0028,0010) * Columns (0028,0011) * Number of Frames (0028,0008) * 2 *
* (⌊(Bits Allocated (0028,0100)-1)/8⌋+1)
*
* padded to an even length.
*/
const photometricInterpretation = dataSet.string('x00280004');
if (photometricInterpretation === 'YBR_FULL_422') {
samplesPerPixel = 2;
console.warn(
`Using SamplesPerPixel of 2 for YBR_FULL_422 photometric interpretation.
See http://dicom.nema.org/medical/dicom/current/output/chtml/part03/sect_C.7.6.3.html for more information.`
);
}
const pixelDataOffset = pixelDataElement.dataOffset;
const pixelsPerFrame = rows * columns * samplesPerPixel;
let frameOffset;
if (bitsAllocated === 8) {
frameOffset = pixelDataOffset + frameIndex * pixelsPerFrame;
if (frameOffset >= dataSet.byteArray.length) {
throw new Error('frame exceeds size of pixelData');
}
return new Uint8Array(
dataSet.byteArray.buffer,
frameOffset,
pixelsPerFrame
);
} else if (bitsAllocated === 16) {
frameOffset = pixelDataOffset + frameIndex * pixelsPerFrame * 2;
if (frameOffset >= dataSet.byteArray.length) {
throw new Error('frame exceeds size of pixelData');
}
return new Uint8Array(
dataSet.byteArray.buffer,
frameOffset,
pixelsPerFrame * 2
);
} else if (bitsAllocated === 1) {
frameOffset = pixelDataOffset + frameIndex * pixelsPerFrame * 0.125;
if (frameOffset >= dataSet.byteArray.length) {
throw new Error('frame exceeds size of pixelData');
}
return unpackBinaryFrame(dataSet.byteArray, frameOffset, pixelsPerFrame);
} else if (bitsAllocated === 32) {
frameOffset = pixelDataOffset + frameIndex * pixelsPerFrame * 4;
if (frameOffset >= dataSet.byteArray.length) {
throw new Error('frame exceeds size of pixelData');
}
return new Uint8Array(
dataSet.byteArray.buffer,
frameOffset,
pixelsPerFrame * 4
);
}
throw new Error('unsupported pixel format');
}
export default getUncompressedImageFrame;
</code></pre>
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