2.6.6.6 imgNoise

Menu Information

Noise

Brief Information

Add random noise to image

Command Line Usage

1. imgnoise r:=5;

2. imgNoise r:=10 img:=mat(1) oimg:=mat(2) c:=green;

Variables

Display
Name
Variable
Name
I/O
and
Type
Default
Value
Description
Coverage r

Input

int

0

Specifies the percentage of coverage for the added noise.

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, the output image is the same as the input image. See the syntax here.

Channel c

Input

int

all

Specifies the channel(s) to add noise

Option list

  • all:All
Adds noise to all channels.
  • red:Red
Adds noise to red channel only.
  • green:Green
Adds noise to green channel only.
  • blue:Blue
Adds noise to blue channel only.

Description

The imgNoise function adds random noise to the input image. You can add noises to all channels or only a specified color channel.

Examples

In this example, we use the imgNoise function to add noise to the red channel of the input image:

  1. When the image is active, select Image: Spatial Filters: Noise to open the dialog of the X-Function.
  2. In the dialog, change the settings as the screenshot below and click OK to close the dialog.
    ImgNoise help English files image002.jpg
    A new image is created. We can see that there are some red noisy points added.
ImgNoise help English files image004.jpg
ImgNoise help English files image006.jpg
The original image
The output image


Algorithm

The computation uses L_AddBitmapNoise() function from LEADTOOLS Main API. Please refer to the LEADTOOLS Main API Help file, Version 14 and read the L_AddBitmapNoise topic.

References

LEADTOOLS Main API Help file, Version 14

Related X-Functions

imgMedian, imgAverage, imgGaussian, imgUserfilter