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DownsampleImage

Header:	FIL.h
Namespace:	fil

Shrinks an image by the factor of two along each axis.

Syntax

void fil::DownsampleImage
(
	const fil::Image& inImage,
	const int inScaleStep,
	fil::Image& outImage
)

Parameters

Name	Type	Range	Default	Description
inImage	const Image&			Input image
inScaleStep	const int	0 - 12	1	Defines how many times the image size is divided by 2
outImage	Image&			Output image

Description

The operation shrinks the inImage reducing its dimensions by a factor of two inScaleStep times.

Remarks

The operation produces a new image by averaging four neighboring pixels from the source image repeatedly. New width and height of image are always rounded up, thus pixels from source image at last row or column are averaged in pairs or copied when corresponding dimension is odd.

This operation can be used as faster replacement for ShrinkImageNTimes.

Hardware Acceleration

This operation is optimized for SSE2 technology for pixels of type: 1xUINT8.

This operation is optimized for SSSE3 technology for pixels of type: 3xUINT8.