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import type { Types } from '@cornerstonejs/core';
import type { VoxelManager } from '@cornerstonejs/core/utilities';
import type {
FloodFillIntensityRangeOptions,
FloodFillIntensityRangeResult,
} from '../floodFillIntensityRangeTypes';
import type { GetFloodFillIntensityRange } from '../floodFillIntensityRangeTypes';
import { getViewportVoiMappingForVolume } from '../getViewportVoiMappingForVolume';
import type { ViewportVoiMappingForTool } from '../getViewportVoiMappingForVolume';
import { DEFAULT_POSITIVE_STD_DEV_MULTIPLIER } from '../constants';
type NumberVoxelManager = VoxelManager<number>;
const {
transformWorldToIndex,
mapScalarToViewportVoiIntensity,
mapViewportVoiIntensityToScalar,
getVolumeDirectionVectors,
} = csUtils;
const { growCutLog: log } = csUtils.logger;
/**
* Adaptive one-click region strategy ("no disk"): from a single click the
* strategy inspects an in-plane analysis window around the pointer, snaps the
* seed onto the most locally-contrasting pixel (so clicking on/near a region
* edge still lands inside it), determines the region polarity (brighter or
* darker than its surroundings), then sweeps every possible one-sided
* intensity threshold in one pass and picks the threshold whose region stays
* stable over the widest span before leaking into the surroundings.
*
* The band is **one-sided**: for a hot region it is "everything at least this
* intense" with no upper limit, so the hottest core of a PET lesion can never
* be excluded (no interior holes); symmetrically for dark regions. A segment
* is only "meaningful" when its in-plane footprint falls within physical
* (mm²) lesion-scale bounds — a whole PET body section or a speck of noise is
* rejected, and callers surface that as a blocked cursor / no-op click.
*
* It is intentionally configuration-free: all constants below are internal.
*/
/** Analysis half-window (in-plane voxels) centered on the click. */
const WINDOW_RADIUS_PX = 96;
/** Seed snapping search radius (in-plane voxels) around the clicked pixel. */
const SEED_SNAP_RADIUS_PX = 4;
/** Hard floor in pixels regardless of spacing (sub-resolution specks). */
const MIN_REGION_PX = 6;
/** Smallest meaningful in-plane footprint (≈3 mm diameter). */
const MIN_REGION_MM2 = 8;
/**
* Analyzability guard, not a size rule: a region that floods most of the
* analysis window has no boundary we can see, so it reads as unbounded.
* There is intentionally no physical maximum — large lesions are legitimate;
* entity coherence is judged in 3D by the tool (shape gate), not by size.
*/
const MAX_REGION_WINDOW_FRACTION = 0.6;
/** Local contrast (display bytes) below which the vicinity is considered flat. */
const FLAT_CONTRAST_BYTES = 10;
/** Minimum threshold depth (display bytes) so the fill tolerates noise. */
const MIN_TOLERANCE_BYTES = 2;
/**
* A region only counts as properly bounded when its growth stays quiet over at
* least this many tolerance levels (its stability run). Areas that grow
* substantially at every tolerance never form one and are rejected as
* unbounded.
*/
const MIN_PLATEAU_WIDTH_BYTES = 4;
/** Per-level growth (pixels) always considered quiet (boundary trickle). */
const QUIET_GAIN_ABS_PX = 3;
/** Per-level growth below this fraction of the region is considered quiet. */
const QUIET_GAIN_FRACTION = 0.02;
export type AdaptiveRegionProbeReason =
| 'ok'
| 'outside-volume'
| 'flat-region'
| 'too-small'
| 'unbounded'
/** A region exists nearby but the pointer itself is not on it. */
| 'off-target';
/**
* Everything needed to rebuild the intensity band at a different tolerance
* after the click — the basis for trustworthy, deterministic expand/shrink
* (each step moves along the recorded growth curve instead of re-guessing).
*/
export type AdaptiveRegionExpandContext = {
/** Seed reference display byte. */
seedByte: number;
/** +1 = region brighter than surroundings, -1 = darker. */
polarity: 1 | -1;
/** VOI mapping snapshot taken at click time (display-space stability). */
voiMapping: ViewportVoiMappingForTool | null;
/** Raw normalization fallback when no VOI mapping was available. */
rawWindow: { min: number; span: number };
/** Snapped seed (volume ijk). */
seedIjk: Types.Point3;
/** Raw scalar at the snapped seed. */
seedScalar: number;
/** Region growth change points: [toleranceLevel, regionSizePx]. */
growthCurve: Array<[number, number]>;
/** Tolerance the click ran with. */
chosenToleranceBytes: number;
/** Last tolerance level covered by the sweep. */
growthEndLevel: number;
/** mm² covered by one in-plane pixel. */
pxAreaMm2: number;
};
export type AdaptiveRegionProbeResult = {
/** True when a proper (bounded, non-trivial) region was found at the click. */
viable: boolean;
reason: AdaptiveRegionProbeReason;
/** Intensity band + seed for the flood fill; null when not viable. */
range: FloodFillIntensityRangeResult | null;
/** In-plane region size (pixels) at the chosen tolerance. */
regionSizePx?: number;
/** In-plane region footprint (mm²) at the chosen tolerance. */
regionAreaMm2?: number;
/** Chosen threshold depth in display-byte units (0..255). */
toleranceBytes?: number;
/**
* Present when viable: tolerance level at which each of the clicked pixel's
* 4 in-plane neighbors ([-A, +A, -B, +B]) joined the region during the
* sweep (-1 = never joined, null = outside the volume). Lets hover
* consensus checks vote from this one sweep instead of re-probing each
* neighbor with its own full window analysis.
*/
clickNeighborJoinLevels?: Array<number | null>;
/** Present when viable: context for deterministic expand/shrink. */
expandContext?: AdaptiveRegionExpandContext;
/** Growth internals for the selection stage (present on its failures). */
debug?: {
/** Region growth change points: [toleranceLevel, regionSizePx]. */
growthCurve: Array<[number, number]>;
/** Quiet runs: [startLevel, endLevel, regionSizePx]. */
quietRuns: Array<[number, number, number]>;
seedByte: number;
backgroundByte: number;
polarity: number;
borderTouchLevel: number;
explosionLevel: number;
/** Tolerance level at which the clicked pixel joined the region (-1 = never). */
clickJoinLevel: number;
minRegionPx: number;
maxRegionPx: number;
pxAreaMm2: number;
};
};
export type AdaptiveRegionCoreInput = {
dimensions: Types.Point3;
/** Raw scalar accessor; may return undefined/NaN for missing data. */
getScalar: (i: number, j: number, k: number) => number;
/** Clicked voxel (ijk, already rounded/bounded by the caller). */
ijkClick: Types.Point3;
/** The two in-plane axis indices (0=i, 1=j, 2=k). Defaults to [0, 1]. */
inPlaneAxes?: [number, number];
/** mm per pixel along the two in-plane axes. Defaults to [1, 1]. */
inPlaneSpacing?: [number, number];
/** Viewport VOI mapping; when absent, bytes use window-local raw min/max. */
voiMapping?: ViewportVoiMappingForTool | null;
/**
* Band scale relative to the default: >1 widens (expand), <1 narrows
* (shrink). Wired from legacy shrink/expand actions.
*/
toleranceScale?: number;
};
function medianOf(values: number[]): number {
if (!values.length) {
return 0;
}
const sorted = values.slice().sort((a, b) => a - b);
return sorted[Math.floor(sorted.length / 2)];
}
/**
* One-sided raw band for a threshold depth below the seed's elevation. The
* included side (at and beyond the seed's intensity, in display terms) is
* unbounded so a lesion's hottest core is always inside the fill.
*/
function rawBandForTolerance(
context: Pick<
AdaptiveRegionExpandContext,
'seedByte' | 'polarity' | 'voiMapping' | 'rawWindow' | 'seedScalar'
>,
toleranceBytes: number
): { min: number; max: number } {
const { seedByte, polarity, voiMapping, rawWindow, seedScalar } = context;
const thresholdByte = Math.max(
0,
Math.min(
255,
polarity > 0 ? seedByte - toleranceBytes : seedByte + toleranceBytes
)
);
const includedExtremeByte = polarity > 0 ? 255 : 0;
const rawFromByte = (byte: number): number =>
voiMapping
? mapViewportVoiIntensityToScalar(byte / 255, voiMapping)
: rawWindow.min + (byte / 255) * rawWindow.span;
const rawThreshold = rawFromByte(thresholdByte);
const rawExtreme = rawFromByte(includedExtremeByte);
let min: number;
let max: number;
if (rawExtreme >= rawThreshold) {
min = rawThreshold;
max = Infinity;
} else {
min = -Infinity;
max = rawThreshold;
}
if (Number.isFinite(seedScalar)) {
min = Math.min(min, seedScalar);
max = Math.max(max, seedScalar);
}
return { min, max };
}
/**
* Rebuilds the flood-fill intensity range for a stored click context at a new
* tolerance. Used by expand/shrink so each step is deterministic against the
* click-time growth curve (and immune to later window/level changes).
*/
export function resolveAdaptiveBandAtTolerance(
context: AdaptiveRegionExpandContext,
toleranceBytes: number
): FloodFillIntensityRangeResult {
const tolerance = Math.max(0, Math.min(255, Math.round(toleranceBytes)));
const { min, max } = rawBandForTolerance(context, tolerance);
return {
min,
max,
ijkStart: [...context.seedIjk] as Types.Point3,
diagnostics: {
neighborhoodMean: Number.isFinite(context.seedScalar)
? context.seedScalar
: 0,
neighborhoodStdDev: 0,
clickedVoxelValue: Number.isFinite(context.seedScalar)
? context.seedScalar
: 0,
positiveStdDevMultiplier: 1,
neighborhoodRadius: SEED_SNAP_RADIUS_PX,
strategy: 'adaptiveRegion:atTolerance',
adaptive: {
toleranceBytes: tolerance,
regionSizePx: -1,
backgroundByte: -1,
seedByte: context.seedByte,
seedSnapped: false,
windowSize: [0, 0],
polarity: context.polarity,
},
},
};
}
/**
* Core of the adaptive probe, operating on an abstract scalar accessor so it
* is unit-testable without viewports or caches. See module doc for the idea.
*/
export function probeAdaptiveRegionCore(
input: AdaptiveRegionCoreInput
): AdaptiveRegionProbeResult {
const { dimensions, getScalar, ijkClick, voiMapping } = input;
const inPlaneAxes = input.inPlaneAxes ?? [0, 1];
const inPlaneSpacing = input.inPlaneSpacing ?? [1, 1];
for (let axis = 0; axis < 3; axis++) {
if (ijkClick[axis] < 0 || ijkClick[axis] >= dimensions[axis]) {
return { viable: false, reason: 'outside-volume', range: null };
}
}
const [axisA, axisB] = inPlaneAxes;
const a0 = Math.max(0, ijkClick[axisA] - WINDOW_RADIUS_PX);
const a1 = Math.min(
dimensions[axisA] - 1,
ijkClick[axisA] + WINDOW_RADIUS_PX
);
const b0 = Math.max(0, ijkClick[axisB] - WINDOW_RADIUS_PX);
const b1 = Math.min(
dimensions[axisB] - 1,
ijkClick[axisB] + WINDOW_RADIUS_PX
);
const wA = a1 - a0 + 1;
const wB = b1 - b0 + 1;
const windowArea = wA * wB;
const spacingA =
Number.isFinite(inPlaneSpacing[0]) && inPlaneSpacing[0] > 0
? inPlaneSpacing[0]
: 1;
const spacingB =
Number.isFinite(inPlaneSpacing[1]) && inPlaneSpacing[1] > 0
? inPlaneSpacing[1]
: 1;
const pxAreaMm2 = spacingA * spacingB;
// Minimum is physical (specks are not lesions); maximum is only the
// analyzability guard relative to the window.
const minRegionPx = Math.max(
MIN_REGION_PX,
Math.ceil(MIN_REGION_MM2 / pxAreaMm2)
);
const maxRegionPx = Math.max(
minRegionPx + 1,
Math.floor(windowArea * MAX_REGION_WINDOW_FRACTION)
);
const scalarAt = (x: number, y: number): number => {
const ijk: Types.Point3 = [...ijkClick] as Types.Point3;
ijk[axisA] = a0 + x;
ijk[axisB] = b0 + y;
return Number(getScalar(ijk[0], ijk[1], ijk[2]));
};
// Pass 1: raw scalars (kept for the no-VOI fallback normalization).
const rawValues = new Float64Array(windowArea);
let rawMinInWindow = Infinity;
let rawMaxInWindow = -Infinity;
for (let y = 0; y < wB; y++) {
for (let x = 0; x < wA; x++) {
const v = scalarAt(x, y);
rawValues[y * wA + x] = v;
if (Number.isFinite(v)) {
if (v < rawMinInWindow) {
rawMinInWindow = v;
}
if (v > rawMaxInWindow) {
rawMaxInWindow = v;
}
}
}
}
if (!Number.isFinite(rawMinInWindow)) {
return { viable: false, reason: 'outside-volume', range: null };
}
// Display bytes 0..255 (what the user sees); -1 marks missing samples.
const rawSpan = rawMaxInWindow - rawMinInWindow || 1;
const bytes = new Int16Array(windowArea);
for (let idx = 0; idx < windowArea; idx++) {
const v = rawValues[idx];
if (!Number.isFinite(v)) {
bytes[idx] = -1;
continue;
}
const mapped = voiMapping
? mapScalarToViewportVoiIntensity(v, voiMapping)
: (v - rawMinInWindow) / rawSpan;
bytes[idx] = Math.max(0, Math.min(255, Math.round(mapped * 255)));
}
// Background estimate: median display byte on the window perimeter.
const ringBytes: number[] = [];
for (let x = 0; x < wA; x++) {
if (bytes[x] >= 0) {
ringBytes.push(bytes[x]);
}
const bottom = (wB - 1) * wA + x;
if (wB > 1 && bytes[bottom] >= 0) {
ringBytes.push(bytes[bottom]);
}
}
for (let y = 1; y < wB - 1; y++) {
const left = y * wA;
const right = y * wA + (wA - 1);
if (bytes[left] >= 0) {
ringBytes.push(bytes[left]);
}
if (wA > 1 && bytes[right] >= 0) {
ringBytes.push(bytes[right]);
}
}
const backgroundByte = medianOf(ringBytes);
// Seed snap: most locally-contrasting pixel near the click, so an edge
// click lands inside the structure instead of on its partial-volume shell.
const clickX = ijkClick[axisA] - a0;
const clickY = ijkClick[axisB] - b0;
let seedX = clickX;
let seedY = clickY;
let bestContrast = -1;
let bestDist = Infinity;
const snapR2 = SEED_SNAP_RADIUS_PX * SEED_SNAP_RADIUS_PX;
for (let dy = -SEED_SNAP_RADIUS_PX; dy <= SEED_SNAP_RADIUS_PX; dy++) {
for (let dx = -SEED_SNAP_RADIUS_PX; dx <= SEED_SNAP_RADIUS_PX; dx++) {
if (dx * dx + dy * dy > snapR2) {
continue;
}
const x = clickX + dx;
const y = clickY + dy;
if (x < 0 || x >= wA || y < 0 || y >= wB) {
continue;
}
const byte = bytes[y * wA + x];
if (byte < 0) {
continue;
}
const contrast = Math.abs(byte - backgroundByte);
const dist = dx * dx + dy * dy;
if (
contrast > bestContrast ||
(contrast === bestContrast && dist < bestDist)
) {
bestContrast = contrast;
bestDist = dist;
seedX = x;
seedY = y;
}
}
}
if (bestContrast < 0) {
return { viable: false, reason: 'outside-volume', range: null };
}
if (bestContrast < FLAT_CONTRAST_BYTES) {
return { viable: false, reason: 'flat-region', range: null };
}
// Region polarity: brighter or darker than the surroundings. All growth is
// then computed in "elevation" space where the structure is always high.
const seedPixelByte = bytes[seedY * wA + seedX];
const polarity: 1 | -1 = seedPixelByte >= backgroundByte ? 1 : -1;
const elevation = (byte: number): number =>
polarity > 0 ? byte : 255 - byte;
// Reference value: median of the 3x3 neighbors on the seed's side of the
// background (noise robustness). Restricting to same-side neighbors keeps
// thin/tiny structures from dragging the reference onto the background.
const seedNeighborhood: number[] = [];
for (let dy = -1; dy <= 1; dy++) {
for (let dx = -1; dx <= 1; dx++) {
const x = seedX + dx;
const y = seedY + dy;
if (x < 0 || x >= wA || y < 0 || y >= wB) {
continue;
}
const byte = bytes[y * wA + x];
if (
byte >= 0 &&
Math.abs(byte - seedPixelByte) <= Math.abs(byte - backgroundByte)
) {
seedNeighborhood.push(byte);
}
}
}
const v0 = seedNeighborhood.length
? medianOf(seedNeighborhood)
: seedPixelByte;
const h0 = elevation(v0);
// One-pass threshold sweep: a bucket-queue flood that grows the connected
// region by descending intensity threshold. Cost is one-sided: anything at
// or above the seed's elevation joins immediately (level 0) — a lesion's
// hot core can never be excluded — and cooler pixels join once the
// threshold drops to their elevation.
const cost = (idx: number): number => {
const byte = bytes[idx];
if (byte < 0) {
return -1;
}
return Math.max(0, h0 - elevation(byte));
};
const buckets: number[][] = new Array(256);
const pushToBucket = (level: number, idx: number) => {
let bucket = buckets[level];
if (!bucket) {
bucket = [];
buckets[level] = bucket;
}
bucket.push(idx);
};
const visited = new Uint8Array(windowArea); // 0 unseen, 1 queued, 2 region
const seedIdx = seedY * wA + seedX;
const seedCost = cost(seedIdx);
if (seedCost < 0) {
return { viable: false, reason: 'flat-region', range: null };
}
pushToBucket(seedCost, seedIdx);
visited[seedIdx] = 1;
type CurvePoint = { level: number; size: number };
const curve: CurvePoint[] = [];
const clickIdx = clickY * wA + clickX;
let clickJoinLevel = -1;
// The click's 4 in-plane neighbors ([-A, +A, -B, +B]): record when each
// joins the region, exactly like the click pixel itself. The window always
// contains them unless clamped at the volume edge (null = not evaluable).
const neighborOffsets: Array<[number, number]> = [
[-1, 0],
[1, 0],
[0, -1],
[0, 1],
];
const clickNeighborJoinLevels: Array<number | null> = [];
const neighborWatch = new Map<number, number>();
neighborOffsets.forEach(([dx, dy], slot) => {
const x = clickX + dx;
const y = clickY + dy;
if (x < 0 || x >= wA || y < 0 || y >= wB) {
clickNeighborJoinLevels.push(null);
return;
}
clickNeighborJoinLevels.push(-1);
neighborWatch.set(y * wA + x, slot);
});
let size = 0;
let borderTouchLevel = -1;
let explosionLevel = -1;
outer: for (let level = 0; level < 256; level++) {
const bucket = buckets[level];
if (bucket?.length) {
// Plain index loop: neighbors with cost <= level append to this bucket.
for (let bi = 0; bi < bucket.length; bi++) {
const idx = bucket[bi];
if (visited[idx] === 2) {
continue;
}
visited[idx] = 2;
size++;
if (idx === clickIdx) {
clickJoinLevel = level;
}
const watchSlot = neighborWatch.get(idx);
if (watchSlot !== undefined) {
clickNeighborJoinLevels[watchSlot] = level;
}
const x = idx % wA;
const y = Math.floor(idx / wA);
if (
borderTouchLevel < 0 &&
(x === 0 || x === wA - 1 || y === 0 || y === wB - 1)
) {
borderTouchLevel = level;
}
if (size > maxRegionPx) {
explosionLevel = level;
break outer;
}
const neighbors = [idx - 1, idx + 1, idx - wA, idx + wA];
const canLeft = x > 0;
const canRight = x < wA - 1;
const canUp = y > 0;
const canDown = y < wB - 1;
const allowed = [canLeft, canRight, canUp, canDown];
for (let n = 0; n < 4; n++) {
if (!allowed[n]) {
continue;
}
const nIdx = neighbors[n];
if (visited[nIdx] !== 0) {
continue;
}
const nCost = cost(nIdx);
if (nCost < 0) {
continue;
}
visited[nIdx] = 1;
pushToBucket(Math.max(level, nCost), nIdx);
}
}
bucket.length = 0;
}
const lastSize = curve.length ? curve[curve.length - 1].size : 0;
if (size > lastSize) {
curve.push({ level, size });
}
}
// Threshold selection (MSER-style): find "quiet runs" — spans of tolerance
// levels where the region grows at most a trickle (a few boundary pixels per
// level). A proper region shows a wide quiet run between filling itself and
// leaking into the surroundings; uniform organs and background gradients
// grow substantially at every level and never form one. The threshold is
// placed mid-run so the 3D fill is robust to slice-to-slice drift.
const growthEndLevel = explosionLevel >= 0 ? explosionLevel - 1 : 255;
type QuietRun = {
startLevel: number;
endLevel: number;
width: number;
size: number;
};
const runs: QuietRun[] = [];
{
let runStart = -1;
let currentSize = 0;
let ci = 0;
const closeRun = (endLevel: number, sizeAtEnd: number) => {
if (runStart >= 0 && endLevel >= runStart) {
runs.push({
startLevel: runStart,
endLevel,
width: endLevel - runStart,
size: sizeAtEnd,
});
}
runStart = -1;
};
for (let level = 0; level <= growthEndLevel; level++) {
const sizeBefore = currentSize;
let gain = 0;
if (ci < curve.length && curve[ci].level === level) {
gain = curve[ci].size - currentSize;
currentSize = curve[ci].size;
ci++;
}
const quietThreshold = Math.max(
QUIET_GAIN_ABS_PX,
Math.floor(sizeBefore * QUIET_GAIN_FRACTION)
);
if (currentSize > 0 && gain <= quietThreshold) {
if (runStart < 0) {
runStart = level;
}
} else {
// The gain that ends a run is the leak; record the pre-leak size.
closeRun(level - 1, sizeBefore);
}
}
closeRun(growthEndLevel, currentSize);
}
let best: QuietRun | null = null;
for (const run of runs) {
const endLevel =
borderTouchLevel >= 0
? Math.min(run.endLevel, borderTouchLevel - 1)
: run.endLevel;
if (endLevel < run.startLevel) {
continue;
}
const clipped: QuietRun = {
...run,
endLevel,
width: endLevel - run.startLevel,
};
if (clipped.size < minRegionPx || clipped.size > maxRegionPx) {
continue;
}
if (!best || clipped.width > best.width) {
best = clipped;
}
}
const selectionDebug = () => ({
growthCurve: curve.map((p): [number, number] => [p.level, p.size]),
quietRuns: runs.map((run): [number, number, number] => [
run.startLevel,
run.endLevel,
run.size,
]),
seedByte: v0,
backgroundByte,
polarity,
borderTouchLevel,
explosionLevel,
clickJoinLevel,
minRegionPx,
maxRegionPx,
pxAreaMm2,
});
if (!best || best.width < MIN_PLATEAU_WIDTH_BYTES) {
// Distinguish "there was a stable region but it is tiny" from "nothing
// ever stabilized" for diagnostics; both show as blocked to the user.
const stableButSmall = runs.find(
(run) =>
run.size < minRegionPx &&
run.width >= MIN_PLATEAU_WIDTH_BYTES &&
(borderTouchLevel < 0 || run.startLevel < borderTouchLevel)
);
const failSize = best?.size ?? stableButSmall?.size ?? size;
return {
viable: false,
reason: stableButSmall ? 'too-small' : 'unbounded',
range: null,
regionSizePx: failSize,
regionAreaMm2: failSize * pxAreaMm2,
debug: selectionDebug(),
};
}
let toleranceBytes = best.startLevel + Math.floor(best.width / 2);
toleranceBytes = Math.min(
Math.max(toleranceBytes, MIN_TOLERANCE_BYTES),
best.endLevel
);
const toleranceScale =
input.toleranceScale && input.toleranceScale > 0 ? input.toleranceScale : 1;
toleranceBytes = Math.max(
1,
Math.min(255, Math.round(toleranceBytes * toleranceScale))
);
const chosen = best;
// The pointer must be ON the region it would segment: if the clicked pixel
// itself is not part of the region at the chosen threshold (it only exists
// because the seed snapped onto a nearby structure), report off-target so
// the cursor blocks the surroundings of a lesion.
if (clickJoinLevel < 0 || clickJoinLevel > toleranceBytes) {
return {
viable: false,
reason: 'off-target',
range: null,
regionSizePx: chosen.size,
regionAreaMm2: chosen.size * pxAreaMm2,
debug: selectionDebug(),
};
}
const seedIjk: Types.Point3 = [...ijkClick] as Types.Point3;
seedIjk[axisA] = a0 + seedX;
seedIjk[axisB] = b0 + seedY;
const seedScalar = rawValues[seedIdx];
const clickedScalar = rawValues[clickY * wA + clickX];
const expandContext: AdaptiveRegionExpandContext = {
seedByte: v0,
polarity,
voiMapping: voiMapping ?? null,
rawWindow: { min: rawMinInWindow, span: rawSpan },
seedIjk,
seedScalar: Number.isFinite(seedScalar) ? seedScalar : 0,
growthCurve: curve.map((p): [number, number] => [p.level, p.size]),
chosenToleranceBytes: toleranceBytes,
growthEndLevel,
pxAreaMm2,
};
const { min: rawLo, max: rawHi } = rawBandForTolerance(
expandContext,
toleranceBytes
);
return {
viable: true,
reason: 'ok',
regionSizePx: chosen.size,
regionAreaMm2: chosen.size * pxAreaMm2,
toleranceBytes,
clickNeighborJoinLevels,
expandContext,
range: {
min: rawLo,
max: rawHi,
ijkStart: seedIjk,
diagnostics: {
neighborhoodMean: Number.isFinite(seedScalar) ? seedScalar : 0,
neighborhoodStdDev: 0,
clickedVoxelValue: Number.isFinite(clickedScalar) ? clickedScalar : 0,
positiveStdDevMultiplier: toleranceScale,
neighborhoodRadius: SEED_SNAP_RADIUS_PX,
strategy: 'adaptiveRegion',
adaptive: {
toleranceBytes,
regionSizePx: chosen.size,
regionAreaMm2: chosen.size * pxAreaMm2,
backgroundByte,
seedByte: v0,
polarity,
seedSnapped: seedX !== clickX || seedY !== clickY,
windowSize: [wA, wB],
growthCurve: curve.map((p): [number, number] => [p.level, p.size]),
explosionLevel,
borderTouchLevel,
},
},
},
};
}
/**
* The two volume axes lying in the viewed plane (from the viewport camera for
* orthogonal views), defaulting to the acquisition plane [0, 1].
*/
export function resolveInPlaneAxes(
referencedVolume: Types.IImageVolume,
viewport: Types.IViewport | undefined
): [number, number] {
if (!viewport) {
return [0, 1];
}
try {
const camera = viewport.getCamera();
const { ijkVecSliceDir } = getVolumeDirectionVectors(
referencedVolume.imageData,
camera
);
const abs = ijkVecSliceDir.map(Math.abs);
let sliceAxis = 0;
if (abs[1] >= abs[0] && abs[1] >= abs[2]) {
sliceAxis = 1;
} else if (abs[2] >= abs[0] && abs[2] >= abs[1]) {
sliceAxis = 2;
}
const axes = [0, 1, 2].filter((axis) => axis !== sliceAxis);
return [axes[0], axes[1]];
} catch {
return [0, 1];
}
}
/**
* Probes whether a one-click segmentation at `worldPosition` would produce a
* meaningful region, and if so returns the flood-fill intensity band plus the
* context for deterministic expand/shrink. Cheap enough to run on hover
* (single in-plane window, one pass).
*/
export function probeAdaptiveRegion(
referencedVolume: Types.IImageVolume,
worldPosition: Types.Point3,
options?: FloodFillIntensityRangeOptions
): AdaptiveRegionProbeResult {
const { dimensions, imageData, spacing } = referencedVolume;
const voxelManager =
referencedVolume.voxelManager as unknown as NumberVoxelManager;
const [width, height] = dimensions;
const pixelsPerSlice = width * height;
const ijkClick = transformWorldToIndex(imageData, worldPosition).map(
Math.round
) as Types.Point3;
const voiMapping =
options?.voiMapping ??
(options?.viewport && options?.referencedVolumeId
? getViewportVoiMappingForVolume(
options.viewport,
options.referencedVolumeId
)
: null);
const toleranceScale = options?.positiveStdDevMultiplier
? options.positiveStdDevMultiplier / DEFAULT_POSITIVE_STD_DEV_MULTIPLIER
: 1;
const inPlaneAxes = resolveInPlaneAxes(referencedVolume, options?.viewport);
const inPlaneSpacing: [number, number] = [
spacing?.[inPlaneAxes[0]] ?? 1,
spacing?.[inPlaneAxes[1]] ?? 1,
];
const result = probeAdaptiveRegionCore({
dimensions,
getScalar: (i, j, k) =>
Number(voxelManager.getAtIndex(k * pixelsPerSlice + j * width + i)),
ijkClick,
inPlaneAxes,
inPlaneSpacing,
voiMapping,
toleranceScale,
});
log.debug('adaptiveRegion probe', {
ijkClick,
viable: result.viable,
reason: result.reason,
regionSizePx: result.regionSizePx,
regionAreaMm2: result.regionAreaMm2,
toleranceBytes: result.toleranceBytes,
band: result.range
? { min: result.range.min, max: result.range.max }
: null,
});
return result;
}
/**
* `GetFloodFillIntensityRange`-compatible wrapper around
* {@link probeAdaptiveRegion}: returns the band when a meaningful region
* exists at the click, otherwise null (surfaced by tools as "cannot segment
* here").
*/
export const getAdaptiveRegionIntensityRange: GetFloodFillIntensityRange = (
referencedVolume,
worldPosition,
options
) => {
const probe = probeAdaptiveRegion(referencedVolume, worldPosition, options);
if (!probe.viable) {
log.info('adaptiveRegion: no proper region at click', {
reason: probe.reason,
regionSizePx: probe.regionSizePx,
regionAreaMm2: probe.regionAreaMm2,
debug: probe.debug,
});
return null;
}
return probe.range;
};
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