2.6.5.4 imgResize

Menu Information

Resize

Brief Information

Resize image

Command Line Usage

1. imgResize lock:=1 unit:=pixel w:=50;

2. imgResize lock:=1 unit:=percent h:=120 interpolate:=resample;

3. imgResize lock:=0 w:=120 h:=130 interpolate:=normal img:=mat(1) oimg:=mat(2);

Variables

Display
Name
Variable
Name
I/O
and
Type
Default
Value
Description
Lock Proportions lock

Input

int

1

Specifies whether or not to keep the aspect ratio of the original image.

Unit unit

Input

int

percent

This variable works with two other variables, w and h. It specifies the units for them.

Option list

  • pixel:Pixel
The width (w) and height (h) of the output image are measured in pixels.
  • percent :Percent
The width (w) and height (h) of the output image are measured in percentage of the width and height of the input image.
Width w

Input/Output

double

Specifies the width of the output image.

Height h

Input/Output

double

Specifies the height of the output image.

Input Matrix img

Input

Image

<active>

Specifies the source image to be manipulated. The default input is the active image.

Output Image oimg

Output

Image

<input>

Specifies the output image. By default, it is the same as the input image. See the syntax here.

Interpolation interpolate

Input

int

normal

Specifies the interpolation method which is used when the image is resized.

Option list

  • normal:Normal
Uses nearest neighbor interpolation to produce the resized image.
  • resample:Resample
Uses bilinear interpolation and averaging to produce a higher-quality image.
  • bicubic :Bicubic
Uses bicubic interpolation and averaging to produce a higher quality image. This method is slower than Resample.

Description

This X-Function can be used to resize the input image to any size.

Examples

In this example, we use the imgResize function to resize the input image. We change its width to 300 pixels and its height to 200 pixels:

1. Create a new matrix and import car.bmp under \Samples\Image Processing and Analysis folder into it.
2. From the Origin menu, select Matrix: Set Dimensions. We can see the dimension of the image is 500*375.
ImgResize help English files image002.jpg
Click Cancel to close the dialog.
3. Make the input image is active and select Image: Geometric Transform: Resize. This opens the dialog of the imgResize X-Function.
4. In the imgResize X-Function dialog, change the settings as the screenshot below and click OK to close the dialog.
ImgResize help English files image004.jpg
A new image is created.
5. When the new image is active, choose Matrix: Set Dimensions from the Origin menu to view the dimension of this image.
ImgResize help English files image006.jpg

ImgResize help English files image008.jpg

ImgResize help English files image010.jpg

The original image
The output image


Algorithm

The resizing is implemented with L_SizeBitmap() function from LEADTOOLS Main API. Please refer to the LEADTOOLS Main API Help file, Version 14 and read the L_SizeBitmap topic.

References

LEADTOOLS Main API Help file, Version 14

Related X-Functions

imgShear, imgTrim, imgCrop, imgScale, mdim