2.15.10 cvResize

1 Menu Information
2 Brief Information
3 Additional Information
4 Command Line Usage
5 X-Function Execution Options
6 Variables
7 Description
8 Examples
9 Algorithm
10 References
11 Related X-Functions

Menu Information

Image: Resize...

Brief Information

Resize an image.

Additional Information

Minimum Origin Version Required: 2022

Command Line Usage

1. cvresize width:=100;

2. cvresize width:=50 height:=50;

3. cvresize interp:=cubic w:=500 h:=437;

X-Function Execution Options

Please refer to the page for additional option switches when accessing the x-function from script

Variables

Display Name	Variable Name	I/O and Type	Default Value	Description
Input Image	img	Input/Output ImageLayer	<active>	Select the image to resize. Video is not supported.
Keep Aspect Ratio	aspect	Input int	1	Check this checkbox to keep aspect ratio of the source image.
Width	w	Input int	0	Specify the image width after resizing. If Keep Aspect Ratio is selected, Height will be updated accordingly.
Height	h	Input int	0	Specify the image height after resizing. If Keep Aspect Ratio is selected, Width will be updated accordingly.
By a Factor	f	Input double	1	Resize the image (both Width and Height) by the specified factor.
Interpolation Method	interp	Input int	1	Specify the interpolation method used when the image is resized. Option list: near:Nearest Neighbor(0) Uses nearest neighbor interpolation to resize the image. linear:Bilinear(1) Uses bilinear interpolation and averaging to produce a high-quality image. It is usually used to enlarge the image. cubic:Bicubic(2) Uses bicubic interpolation and averaging to produce a high-quality image. It is slower than Bilinear but provides a higher quality. It is usually used to enlarge the image. area:Pixel Area Relation(3) Uses pixel area relation to resize the image. It is usually used to shrink the image. lanczos:Lanczos(4) Uses Lanczos interpolation to resize the image. The resized image may have out-of-range values.

Description

This X-Function is used to resize the image to a customized height and width according by specified interpolation method.

Examples

Example 1. Resize the image using Lanczos interpolation method

When the image is active, select menu Image: Resize....
In the dialog, change the settings as the screenshot below and click OK to close the dialog.

The image is resized down to the half of the original.

Algorithm

The computation uses function from OpenCV Main API. Please refer to the OpenCV Main API Help file, Version 2.4.11.0 and read imgproc. Image Processing topic.