T - public class NLinearInterpolator<T extends NumericType<T>> extends Floor<RandomAccess<T>> implements RealRandomAccess<T>
| Modifier and Type | Field and Description |
|---|---|
protected T |
accumulator |
protected int |
code
Index into
weights array. |
protected T |
tmp |
protected double[] |
weights
Weights for each pixel of the 2x2x...x2 hypercube of pixels
participating in the interpolation.
|
discrete, position, targetn| Modifier | Constructor and Description |
|---|---|
protected |
NLinearInterpolator(NLinearInterpolator<T> interpolator) |
protected |
NLinearInterpolator(RandomAccessible<T> randomAccessible) |
protected |
NLinearInterpolator(RandomAccessible<T> randomAccessible,
T type) |
| Modifier and Type | Method and Description |
|---|---|
NLinearInterpolator<T> |
copy() |
NLinearInterpolator<T> |
copyRealRandomAccess() |
protected void |
fillWeights()
Fill the
weights array. |
T |
get()
Get the interpolated value at the current position.
|
floor, floor, floor, floor, floor, move, move, move, move, move, setPosition, setPosition, setPosition, setPosition, setPositionbck, fwd, getDoublePosition, getFloatPosition, localize, localize, move, move, move, move, move, setPosition, setPosition, setPosition, setPosition, setPosition, toStringnumDimensionsclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, waitsetPositionAndGet, setPositionAndGet, setPositionAndGetgetDoublePosition, getFloatPosition, localize, localize, localize, positionAsDoubleArray, positionAsRealPointmove, move, move, move, move, setPosition, setPosition, setPosition, setPosition, setPositionbck, fwd, move, move, move, move, move, setPosition, setPosition, setPosition, setPosition, setPositionnumDimensionsprotected int code
weights array.
To visit the pixels that contribute to an interpolated value, we move in a (binary-reflected) Gray code pattern, such that only one dimension of the target position is modified per move.
This index is the corresponding gray code bit pattern which will select the correct corresponding weight.
protected final double[] weights
Indices into this array are arranged in the standard iteration order (as
provided by IntervalIndexer.positionToIndex(int[], int[])). Element 0 refers to
position (0,0,...,0), element 1 refers to position
(1,0,...,0), element 2 refers to position (0,1,...,0),
etc.
protected final T extends NumericType<T> accumulator
protected final T extends NumericType<T> tmp
protected NLinearInterpolator(NLinearInterpolator<T> interpolator)
protected NLinearInterpolator(RandomAccessible<T> randomAccessible, T type)
protected NLinearInterpolator(RandomAccessible<T> randomAccessible)
protected void fillWeights()
weights array.
Let w_d denote the fraction of a pixel at which the sample position p_d lies from the floored position pf_d in dimension d. That is, the value at pf_d contributes with (1 - w_d) to the sampled value; the value at ( pf_d + 1 ) contributes with w_d.
At every pixel, the total weight results from multiplying the weights of all dimensions for that pixel. That is, the "top-left" contributing pixel (position floored in all dimensions) gets assigned weight (1-w_0)(1-w_1)...(1-w_n).
We work through the weights array starting from the highest dimension. For the highest dimension, the first half of the weights contain the factor (1 - w_n) because this first half corresponds to floored pixel positions in the highest dimension. The second half contain the factor w_n. In this first step, the first weight of the first half gets assigned (1 - w_n). The first element of the second half gets assigned w_n
From their, we work recursively down to dimension 0. That is, each half of weights is again split recursively into two partitions. The first element of the second partitions is the first element of the half multiplied with (w_d). The first element of the first partitions is multiplied with (1 - w_d).
When we have reached dimension 0, all weights will have a value assigned.
public T get()
To visit the pixels that contribute to an interpolated value, we move in a (binary-reflected) Gray code pattern, such that only one dimension of the target position is modified per move.
get in interface Sampler<T extends NumericType<T>>public NLinearInterpolator<T> copy()
copy in interface Sampler<T extends NumericType<T>>Sampler in the same state accessing the same
values.
It does NOT copy T, just the state of the Sampler.
Otherwise use T.copy() if available.
Sampler.copy().get() == Sampler.get(), i.e. both hold the same
value, not necessarily the same instance (this is the case for an
ArrayCursor for example)public NLinearInterpolator<T> copyRealRandomAccess()
copyRealRandomAccess in interface RealRandomAccess<T extends NumericType<T>>Copyright © 2015–2022 ImgLib2. All rights reserved.