2.15.10 cvResize


Contents

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

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

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.

References

OpenCV Main API Help file, Version 2.4.11.0

Related X-Functions

ImgResize, CvSetXY