Contrast
Contrast
Library
ComputerVision/Images/Operations
Description
To better understand the contrast and brightness, it is important to remember that two commonly used point processes are multiplication and addition with a constant:
g(x) = αf(x) + β
The parameters α > 0 and β are often called the gain and bias parameters and they control an image's contrast and brightness, respectively. The source image pixels are represented as f(x) and the output image pixels are represented as g(x). You can write the expression as:
g(i,j) = αf (i,j) + β
where i and j indicate that the pixel is located in the i-th row and j-th column.
Parameters
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
useInput | Use inputs | Use inputs to define the contrast and the brightness | Number | 0 |
contrast | Contrast | Specify the values to control the contrast value of every pixel in the image. Specify the values as integers between 0 and 100. | Scalar | |
brightness | Brightness | Specify the values to control the brightness value of every pixel in the image. Specify the values as integers between 0 and 100. | Scalar | |
externalActivation | External activation | This parameter defines if the block receives or inherits an external activation. When External Activation is used, an additional activation port is added to the block. Default is OFF. | Number | 0 |
Ports
| Name | Type | Description | IO Type | Number |
|---|---|---|---|---|
src | explicit | input | 1 | |
image | explicit | output | 1 | |
Port 3 | explicit | input | 2*useInput | |
Port 4 | activation | input | externalActivation |