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/*
* Copyright (c) 2011-2016, Peter Abeles. All Rights Reserved.
*
* This file is part of BoofCV (http://boofcv.org).
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package boofcv.alg.filter.binary.impl;
import boofcv.core.image.border.ImageBorderValue;
import boofcv.core.image.border.ImageBorder_S32;
import boofcv.struct.image.GrayU8;
/**
* Binary operations performed only along the image's border.
*
* @author Peter Abeles
*/
public class ImplBinaryBorderOps {
public static void erode4(GrayU8 input, GrayU8 output) {
ImageBorder_S32 in = ImageBorderValue.wrap(input,0);
final int h = input.height - 1;
final int w = input.width - 1;
for (int x = 0; x < input.width; x++) {
// check top edge
if ((in.get( x, 0) + in.get( x - 1, 0) + in.get( x + 1, 0) + in.get( x, 1)) == 4)
output.set(x, 0, 1);
else
output.set(x, 0, 0);
// check bottom edge
if ((in.get( x, h) + in.get( x - 1, h) + in.get( x + 1, h) + in.get( x, h - 1)) == 4)
output.set(x, h, 1);
else
output.set(x, h, 0);
}
for (int y = 0; y < input.height; y++) {
// check left edge
if ((in.get( 0, y) + in.get( 1, y) + in.get( 0, y - 1) + in.get( 0, y + 1)) == 4)
output.set(0, y, 1);
else
output.set(0, y, 0);
// check right edge
if ((in.get( w, y) + in.get( w - 1, y) + in.get( w, y - 1) + in.get( w, y + 1)) == 4)
output.set(w, y, 1);
else
output.set(w, y, 0);
}
}
public static void dilate4(GrayU8 input, GrayU8 output) {
ImageBorder_S32 in = ImageBorderValue.wrap(input,0);
final int h = input.height - 1;
final int w = input.width - 1;
for (int x = 0; x < input.width; x++) {
// check top edge
if ((in.get( x, 0) + in.get( x - 1, 0) + in.get( x + 1, 0) + in.get( x, 1)) > 0)
output.set(x, 0, 1);
else
output.set(x, 0, 0);
// check bottom edge
if ((in.get( x, h) + in.get( x - 1, h) + in.get( x + 1, h) + in.get( x, h - 1)) > 0)
output.set(x, h, 1);
else
output.set(x, h, 0);
}
for (int y = 0; y < input.height; y++) {
// check left edge
if ((in.get( 0, y) + in.get( 1, y) + in.get( 0, y - 1) + in.get( 0, y + 1)) > 0)
output.set(0, y, 1);
else
output.set(0, y, 0);
// check right edge
if ((in.get( w, y) + in.get( w - 1, y) + in.get( w, y - 1) + in.get( w, y + 1)) > 0)
output.set(w, y, 1);
else
output.set(w, y, 0);
}
}
public static GrayU8 edge4(GrayU8 input, GrayU8 output) {
ImageBorder_S32 in = ImageBorderValue.wrap(input,1);
final int h = input.height - 1;
final int w = input.width - 1;
for (int x = 0; x < input.width; x++) {
// check top edge
if ((in.get( x - 1, 0) + in.get( x + 1, 0) + in.get( x, 1)) == 3)
output.set(x, 0, 0);
else
output.set(x, 0, input.get(x, 0));
// check bottom edge
if ((in.get( x - 1, h) + in.get( x + 1, h) + in.get( x, h - 1)) == 3)
output.set(x, h, 0);
else
output.set(x, h, input.get(x, h));
}
for (int y = 0; y < input.height; y++) {
// check left edge
if ((in.get( 1, y) + in.get( 0, y - 1) + in.get( 0, y + 1)) == 3)
output.set(0, y, 0);
else
output.set(0, y, input.get(0, y));
// check right edge
if ((in.get( w - 1, y) + in.get( w, y - 1) + in.get( w, y + 1)) == 3)
output.set(w, y, 0);
else
output.set(w, y, input.get(w, y));
}
return output;
}
public static void erode8(GrayU8 input, GrayU8 output) {
ImageBorder_S32 in = ImageBorderValue.wrap(input,1);
final int h = input.height - 1;
final int w = input.width - 1;
for (int x = 0; x < input.width; x++) {
// check top edge
if ((in.get( x, 0) + in.get( x - 1, 0) + in.get( x + 1, 0) +
in.get( x - 1, 1) + in.get( x, 1) + in.get( x + 1, 1)) == 6)
output.set(x, 0, 1);
else
output.set(x, 0, 0);
// check bottom edge
if ((in.get( x, h) + in.get( x - 1, h) + in.get( x + 1, h) +
in.get( x - 1, h - 1) + in.get( x, h - 1) + in.get( x + 1, h - 1)) == 6)
output.set(x, h, 1);
else
output.set(x, h, 0);
}
for (int y = 0; y < input.height; y++) {
// check left edge
if ((in.get( 0, y) + in.get( 1, y) + in.get( 0, y - 1) +
in.get( 1, y - 1) + in.get( 0, y + 1) + in.get( 1, y + 1)) == 6)
output.set(0, y, 1);
else
output.set(0, y, 0);
// check right edge
if ((in.get( w - 1, y) + in.get( w, y) + in.get( w - 1, y - 1) +
in.get( w, y - 1) + in.get( w - 1, y + 1) + in.get( w, y + 1)) == 6)
output.set(w, y, 1);
else
output.set(w, y, 0);
}
}
public static void dilate8(GrayU8 input, GrayU8 output) {
ImageBorder_S32 in = ImageBorderValue.wrap(input,0);
final int h = input.height - 1;
final int w = input.width - 1;
for (int x = 0; x < input.width; x++) {
// check top edge
if ((in.get( x, 0) + in.get( x - 1, 0) + in.get( x + 1, 0) +
in.get( x - 1, 1) + in.get( x, 1) + in.get( x + 1, 1)) > 0)
output.set(x, 0, 1);
else
output.set(x, 0, 0);
// check bottom edge
if ((in.get( x, h) + in.get( x - 1, h) + in.get( x + 1, h) +
in.get( x - 1, h - 1) + in.get( x, h - 1) + in.get( x + 1, h - 1)) > 0)
output.set(x, h, 1);
else
output.set(x, h, 0);
}
for (int y = 0; y < input.height; y++) {
// check left edge
if ((in.get( 0, y) + in.get( 1, y) + in.get( 0, y - 1) +
in.get( 1, y - 1) + in.get( 0, y + 1) + in.get( 1, y + 1)) > 0)
output.set(0, y, 1);
else
output.set(0, y, 0);
// check right edge
if ((in.get( w - 1, y) + in.get( w, y) + in.get( w - 1, y - 1) +
in.get( w, y - 1) + in.get( w - 1, y + 1) + in.get( w, y + 1)) > 0)
output.set(w, y, 1);
else
output.set(w, y, 0);
}
}
public static void edge8(GrayU8 input, GrayU8 output) {
ImageBorder_S32 in = ImageBorderValue.wrap(input,1);
final int h = input.height - 1;
final int w = input.width - 1;
for (int x = 0; x < input.width; x++) {
// check top edge
if ((in.get( x - 1, 0) + in.get( x + 1, 0) +
in.get( x - 1, 1) + in.get( x, 1) + in.get( x + 1, 1)) == 5)
output.set(x, 0, 0);
else
output.set(x, 0, input.get(x, 0));
// check bottom edge
if ((in.get( x - 1, h) + in.get( x + 1, h) +
in.get( x - 1, h - 1) + in.get( x, h - 1) + in.get( x + 1, h - 1)) == 5)
output.set(x, h, 0);
else
output.set(x, h, input.get(x, h));
}
for (int y = 0; y < input.height; y++) {
// check left edge
if ((in.get( 1, y) + in.get( 0, y - 1) +
in.get( 1, y - 1) + in.get( 0, y + 1) + in.get( 1, y + 1)) == 5)
output.set(0, y, 0);
else
output.set(0, y, input.get(0, y));
// check right edge
if ((in.get( w - 1, y) + in.get( w - 1, y - 1) +
in.get( w, y - 1) + in.get( w - 1, y + 1) + in.get( w, y + 1)) == 5)
output.set(w, y, 0);
else
output.set(w, y, input.get(w, y));
}
}
public static void removePointNoise(GrayU8 input, GrayU8 output) {
ImageBorder_S32 in = ImageBorderValue.wrap(input,0);
final int h = input.height - 1;
final int w = input.width - 1;
for (int x = 0; x < input.width; x++) {
// check top edge
int total = in.get( x - 1, 0) + in.get( x + 1, 0) +
in.get( x - 1, 1) + in.get( x, 1) + in.get( x + 1, 1);
if (total < 2)
output.set(x, 0, 0);
else
output.set(x, 0, input.get(x, 0));
// check bottom edge
total = in.get( x - 1, h) + in.get( x + 1, h) +
in.get( x - 1, h - 1) + in.get( x, h - 1) + in.get( x + 1, h - 1);
if (total < 2)
output.set(x, h, 0);
else
output.set(x, h, input.get(x, h));
}
for (int y = 0; y < input.height; y++) {
// check left edge
int total = in.get( 1, y) + in.get( 0, y - 1) +
in.get( 1, y - 1) + in.get( 0, y + 1) + in.get( 1, y + 1);
if (total < 2)
output.set(0, y, 0);
else
output.set(0, y, input.get(0, y));
// check right edge
total = in.get( w - 1, y) + in.get( w - 1, y - 1) +
in.get( w, y - 1) + in.get( w - 1, y + 1) + in.get( w, y + 1);
if (total < 2)
output.set(w, y, 0);
else
output.set(w, y, input.get(w, y));
}
}
}
