getRectSubPix

Image processingfunctionOpenCV 5.0.0

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

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

ARGUMENTSimage, patchSize, center, patch

FUNCTIONgetRectSubPix

RETURN TYPEvoid

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

Retrieves a pixel rectangle from an image with sub-pixel accuracy.

The function getRectSubPix extracts pixels from src:

patch(x, y) = src(x +  \texttt{center.x} - ( \texttt{dst.cols} -1)*0.5, y +  \texttt{center.y} - ( \texttt{dst.rows} -1)*0.5)

where the values of the pixels at non-integer coordinates are retrieved using bilinear interpolation. Every channel of multi-channel images is processed independently. Also the image should be a single channel or three channel image. While the center of the rectangle must be inside the image, parts of the rectangle may be outside.

See: warpAffine, warpPerspective

getRectSubPix(image: Mat, patchSize: Size, center: Point2f, patch: Mat, patchType: number): void;

2 available overloads

getRectSubPix(image: Mat, patchSize: Size, center: Point2f, patch: Mat): void;

getRectSubPix(image: Mat, patchSize: Size, center: Point2f, patch: Mat, patchType: number): void;

image: Source image.
patchSize: Size of the extracted patch.
center: Floating point coordinates of the center of the extracted rectangle within the source image. The center must be inside the image.
patch: Output destination, filled by the native operation. Extracted patch that has the size patchSize and the same number of channels as src .
patchType: Depth of the extracted pixels. By default, they have the same depth as src .

Upstream declaration ↗

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