Class SparseMat<T>

Namespace

OpenCvSharp

Assembly

OpenCvSharp.dll

Strongly-typed sparse matrix. T determines the element type, so element access needs no per-call type argument and no runtime type checks: reading an absent element returns default without creating it; assigning through the indexer creates it.

public sealed class SparseMat<T> : SparseMat, IDisposable where T : unmanaged

Type Parameters

T

Element type (e.g. int, Vec3b).

Inheritance

object

CvObject

SparseMat

SparseMat<T>

Implements

IDisposable

Inherited Members

SparseMat.Release()

SparseMat.AssignFrom(SparseMat)

SparseMat.AssignFrom(Mat)

SparseMat.CopyTo(SparseMat)

SparseMat.CopyTo(Mat)

SparseMat.ConvertTo(SparseMat, MatType, double)

SparseMat.ConvertTo(Mat, MatType, double, double)

SparseMat.ToMat()

SparseMat.AssignTo(SparseMat, MatType?)

SparseMat.Create(MatType, params int[])

SparseMat.Clear()

SparseMat.AddRef()

SparseMat.ElemSize()

SparseMat.ElemSize1()

SparseMat.Type()

SparseMat.Depth()

SparseMat.Dims()

SparseMat.Channels()

SparseMat.Size()

SparseMat.Size(int)

SparseMat.NzCount()

SparseMat.As<T>()

SparseMat.ToString()

CvObject.IsDisposed

CvObject.Dispose()

CvObject.ThrowIfDisposed()

CvObject.CvPtr

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

Constructors

SparseMat(params int[])

Constructs an n-dimensional sparse matrix of the given shape.

Properties

this[int, int]

Gets or sets the element at the given 2-D index. Reading an absent element returns default (without creating it); assigning creates the element.

this[int, int, int]

Gets or sets the element at the given 3-D index. Reading an absent element returns default (without creating it); assigning creates the element.

this[ReadOnlySpan<int>]

Gets or sets the element at the given n-D index. Reading an absent element returns default (without creating it); assigning creates the element.

Methods

Clone()

Creates a full (deep) copy of the matrix.

Contains(ReadOnlySpan<int>)

Returns whether an element is stored (non-zero) at the given index.

EnumerateNonZero()

Enumerates every stored (non-zero) element together with its index, mirroring cv::SparseMatConstIterator. This visits only the stored elements, not the full dense index space.

FromMat(Mat)

Creates a typed sparse matrix from a dense Mat. The Mat type must match T.

GetValueRef(ReadOnlySpan<int>)

Returns a reference to the element at the given index, creating it (zero-initialized) if it does not exist. Useful for in-place updates such as accumulation (sm.GetValueRef(i, j)++), which performs a single hash lookup.

Remove(ReadOnlySpan<int>)

Removes the stored element at the given index. Returns false if it was not stored.

TryGetValue(ReadOnlySpan<int>, out T)

Gets the element at the given index if it is stored, without creating it.