idct

Core and matricesfunctionOpenCV 5.0.0

import { idct } from '@banou/opencv-wasm'

Use after await initOpenCV(). See the initialization and named imports guide.

Explore visually: Discrete cosine transform →

Express a signal using cosine basis functions with an implicit even boundary extension.

VISUAL WALKTHROUGHSignal

REFERENCE INPUTSpatial samples

A smooth component and a rapid component are mixed together.

→

RESULTReconstruct a smoother signal

The inverse cosine transform of the retained coefficients preserves broad variation and loses fine oscillation.

Computed 64-sample teaching example, separate from the native OpenCV runtime.

Calculates the inverse Discrete Cosine Transform of a 1D or 2D array.

idct(src, dst, flags) is equivalent to dct(src, dst, flags | DCT_INVERSE).

See: dct, dft, idft, getOptimalDFTSize

idct(src: Mat, dst: Mat, flags: number): void;

2 available overloads

idct(src: Mat, dst: Mat): void;

idct(src: Mat, dst: Mat, flags: number): void;

src

input floating-point single-channel array.

dst

Output destination, filled by the native operation. output array of the same size and type as src.

flags

operation flags.

Upstream declaration ↗

These signatures describe this package. Upstream documentation can mention optional backends that are absent from this build. Check runtime compatibility before choosing a backend or file format.