imgNoise

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

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:

When the image is active, select Image: Spatial Filters: Noise to open the dialog of the X-Function.
In the dialog, change the settings as the screenshot below and click OK to close the dialog.

A new image is created. We can see that there are some red noisy points added.


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