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opencv-wasm

gapi_equalizeHist

gapifunctionOpenCV 5.0.0
import { gapi_equalizeHist } from '@banou/opencv-wasm'

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

ARGUMENTSsrc
FUNCTIONgapi_equalizeHist
RETURN TYPEGMat
Call structure. A void return can still write to destination arguments. The parameter descriptions define inputs, outputs and ownership.

Equalizes the histogram of a grayscale image.

//! gapi_feature

The function equalizes the histogram of the input image using the following algorithm:

  • Calculate the histogram H for src .
  • Normalize the histogram so that the sum of histogram bins is 255.
  • Compute the integral of the histogram:
H'_i =  \sum _{0  \le j < i} H(j)
  • Transform the image using H' as a look-up table: \texttt{dst}(x,y) = H'(\texttt{src}(x,y))

The algorithm normalizes the brightness and increases the contrast of the image.

Note: - The returned image is of the same size and type as input.

  • Function textual ID is "org.opencv.imgproc.equalizeHist"
gapi_equalizeHist(src: GMat): GMat;
src

Source 8-bit single channel image.

Returns

The GMat result. Release returned native handles with using or delete(), including handles nested in results.

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.