boofcv.core.image.border

Enum BorderType

java.lang.Object

java.lang.Enum<BorderType>

boofcv.core.image.border.BorderType

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<BorderType>

public enum BorderType
extends java.lang.Enum<BorderType>

How the image border is handled by a convolution filter. Care should be taken when selecting a border method since some types will not produce meaningful results for all kernel types.

Enum Constant Summary

Enum Constants

Enum Constant and Description
EXTENDED The pixels along the image border are extended outwards.
NORMALIZED The kernel is renormalized to take in account that parts of it are not inside the image.
REFLECT Access to outside the array are reflected back into the array around the closest border.
SKIP Image borders are not processed and are simply skipped over.
VALUE The image border is set to a fixed value.
WRAP Also known as periodic.

Method Summary

Modifier and Type	Method and Description
static BorderType	valueOf(java.lang.String name) Returns the enum constant of this type with the specified name.
static BorderType[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

SKIP

public static final BorderType SKIP

Image borders are not processed and are simply skipped over.

EXTENDED

public static final BorderType EXTENDED

The pixels along the image border are extended outwards. This is recommended for computing the gradient and many convolution operations.

NORMALIZED

public static final BorderType NORMALIZED

The kernel is renormalized to take in account that parts of it are not inside the image. Typically only used with kernels that blur the image.

REFLECT

public static final BorderType REFLECT

Access to outside the array are reflected back into the array around the closest border. This is an even symmetric function, e.g. f(-1) = f(1) = 1, f(-2) = f(2) = 2.

WRAP

public static final BorderType WRAP

Also known as periodic. When a pixel outside of image is accessed it wraps around to the other side of the image as if the image is a loop. Primarily included for historical purposes and because other people use it. In most applications it has the potential of introducing structured noise, which is bad.

VALUE

public static final BorderType VALUE

The image border is set to a fixed value. Generates harsh edges that can cause artifacts in some applications. If no mechanism is provided to let you specify the value then it will default to black.

Method Detail

values

public static BorderType[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (BorderType c : BorderType.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static BorderType valueOf(java.lang.String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null