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BoofCV is an open source Java library for real-time computer vision and robotics applications.
/*
* Copyright (c) 2011-2017, 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.transform.ii;
import boofcv.alg.InputSanityCheck;
import boofcv.alg.transform.ii.impl.ImplIntegralImageOps;
import boofcv.struct.ImageRectangle;
import boofcv.struct.image.*;
/**
*
* Common operations for dealing with integral images.
*
*
* @author Peter Abeles
*/
public class IntegralImageOps {
/**
* Converts a regular image into an integral image.
*
* @param input Regular image. Not modified.
* @param transformed Integral image. If null a new image will be created. Modified.
* @return Integral image.
*/
public static GrayF32 transform(GrayF32 input , GrayF32 transformed ) {
transformed = InputSanityCheck.checkDeclare(input,transformed);
ImplIntegralImageOps.transform(input,transformed);
return transformed;
}
/**
* Converts a regular image into an integral image.
*
* @param input Regular image. Not modified.
* @param transformed Integral image. If null a new image will be created. Modified.
* @return Integral image.
*/
public static GrayF64 transform(GrayF64 input , GrayF64 transformed ) {
transformed = InputSanityCheck.checkDeclare(input,transformed);
ImplIntegralImageOps.transform(input,transformed);
return transformed;
}
/**
* Converts a regular image into an integral image.
*
* @param input Regular image. Not modified.
* @param transformed Integral image. If null a new image will be created. Modified.
* @return Integral image.
*/
public static GrayS32 transform(GrayU8 input , GrayS32 transformed ) {
transformed = InputSanityCheck.checkDeclare(input,transformed,GrayS32.class);
ImplIntegralImageOps.transform(input,transformed);
return transformed;
}
/**
* Converts a regular image into an integral image.
*
* @param input Regular image. Not modified.
* @param transformed Integral image. If null a new image will be created. Modified.
* @return Integral image.
*/
public static GrayS32 transform(GrayS32 input , GrayS32 transformed ) {
transformed = InputSanityCheck.checkDeclare(input,transformed,GrayS32.class);
ImplIntegralImageOps.transform(input, transformed);
return transformed;
}
/**
* Converts a regular image into an integral image.
*
* @param input Regular image. Not modified.
* @param transformed Integral image. If null a new image will be created. Modified.
* @return Integral image.
*/
public static GrayS64 transform(GrayS64 input , GrayS64 transformed ) {
transformed = InputSanityCheck.checkDeclare(input,transformed,GrayS64.class);
ImplIntegralImageOps.transform(input, transformed);
return transformed;
}
/**
* General code for convolving a box filter across an image using the integral image.
*
* @param integral Integral image.
* @param kernel Convolution kernel.
* @param output The convolved image. If null a new image will be declared and returned. Modified.
* @return Convolved image.
*/
public static GrayF32 convolve(GrayF32 integral ,
IntegralKernel kernel ,
GrayF32 output )
{
output = InputSanityCheck.checkDeclare(integral,output);
ImplIntegralImageOps.convolve(integral, kernel, output);
return output;
}
/**
* General code for convolving a box filter across an image using the integral image.
*
* @param integral Integral image.
* @param kernel Convolution kernel.
* @param output The convolved image. If null a new image will be declared and returned. Modified.
* @return Convolved image.
*/
public static GrayF64 convolve(GrayF64 integral ,
IntegralKernel kernel ,
GrayF64 output )
{
output = InputSanityCheck.checkDeclare(integral,output);
ImplIntegralImageOps.convolve(integral,kernel,output);
return output;
}
/**
* General code for convolving a box filter across an image using the integral image.
*
* @param integral Integral image.
* @param kernel Convolution kernel.
* @param output The convolved image. If null a new image will be declared and returned. Modified.
* @return Convolved image.
*/
public static GrayS32 convolve(GrayS32 integral ,
IntegralKernel kernel ,
GrayS32 output )
{
output = InputSanityCheck.checkDeclare(integral,output);
ImplIntegralImageOps.convolve(integral, kernel, output);
return output;
}
/**
* General code for convolving a box filter across an image using the integral image.
*
* @param integral Integral image.
* @param kernel Convolution kernel.
* @param output The convolved image. If null a new image will be declared and returned. Modified.
* @return Convolved image.
*/
public static GrayS64 convolve(GrayS64 integral ,
IntegralKernel kernel ,
GrayS64 output )
{
output = InputSanityCheck.checkDeclare(integral,output);
ImplIntegralImageOps.convolve(integral,kernel,output);
return output;
}
/**
* Convolves the kernel only across the image's border.
*
* @param integral Integral image. Not modified.
* @param kernel Convolution kernel.
* @param output The convolved image. If null a new image will be created. Modified.
* @param borderX Size of the image border along the horizontal axis.
* @param borderY size of the image border along the vertical axis.
*/
public static GrayF32 convolveBorder(GrayF32 integral ,
IntegralKernel kernel ,
GrayF32 output , int borderX , int borderY )
{
output = InputSanityCheck.checkDeclare(integral,output);
ImplIntegralImageOps.convolveBorder(integral,kernel,output,borderX,borderY);
return output;
}
/**
* Convolves the kernel only across the image's border.
*
* @param integral Integral image. Not modified.
* @param kernel Convolution kernel.
* @param output The convolved image. If null a new image will be created. Modified.
* @param borderX Size of the image border along the horizontal axis.
* @param borderY size of the image border along the vertical axis.
*/
public static GrayF64 convolveBorder(GrayF64 integral ,
IntegralKernel kernel ,
GrayF64 output , int borderX , int borderY )
{
output = InputSanityCheck.checkDeclare(integral,output);
ImplIntegralImageOps.convolveBorder(integral,kernel,output,borderX,borderY);
return output;
}
/**
* Convolves the kernel only across the image's border.
*
* @param integral Integral image. Not modified.
* @param kernel Convolution kernel.
* @param output The convolved image. If null a new image will be created. Modified.
* @param borderX Size of the image border along the horizontal axis.
* @param borderY size of the image border along the vertical axis.
*/
public static GrayS32 convolveBorder(GrayS32 integral ,
IntegralKernel kernel ,
GrayS32 output , int borderX , int borderY )
{
output = InputSanityCheck.checkDeclare(integral,output);
ImplIntegralImageOps.convolveBorder(integral,kernel,output,borderX,borderY);
return output;
}
/**
* Convolves the kernel only across the image's border.
*
* @param integral Integral image. Not modified.
* @param kernel Convolution kernel.
* @param output The convolved image. If null a new image will be created. Modified.
* @param borderX Size of the image border along the horizontal axis.
* @param borderY size of the image border along the vertical axis.
*/
public static GrayS64 convolveBorder(GrayS64 integral ,
IntegralKernel kernel ,
GrayS64 output , int borderX , int borderY )
{
output = InputSanityCheck.checkDeclare(integral,output);
ImplIntegralImageOps.convolveBorder(integral,kernel,output,borderX,borderY);
return output;
}
/**
* Convolves a kernel around a single point in the integral image.
*
* @param integral Input integral image. Not modified.
* @param kernel Convolution kernel.
* @param x Pixel the convolution is performed at.
* @param y Pixel the convolution is performed at.
* @return Value of the convolution
*/
public static float convolveSparse(GrayF32 integral , IntegralKernel kernel , int x , int y )
{
return ImplIntegralImageOps.convolveSparse(integral, kernel, x, y);
}
/**
* Convolves a kernel around a single point in the integral image.
*
* @param integral Input integral image. Not modified.
* @param kernel Convolution kernel.
* @param x Pixel the convolution is performed at.
* @param y Pixel the convolution is performed at.
* @return Value of the convolution
*/
public static double convolveSparse(GrayF64 integral , IntegralKernel kernel , int x , int y )
{
return ImplIntegralImageOps.convolveSparse(integral,kernel,x,y);
}
/**
* Convolves a kernel around a single point in the integral image.
*
* @param integral Input integral image. Not modified.
* @param kernel Convolution kernel.
* @param x Pixel the convolution is performed at.
* @param y Pixel the convolution is performed at.
* @return Value of the convolution
*/
public static int convolveSparse(GrayS32 integral , IntegralKernel kernel , int x , int y )
{
return ImplIntegralImageOps.convolveSparse(integral, kernel, x, y);
}
/**
* Convolves a kernel around a single point in the integral image.
*
* @param integral Input integral image. Not modified.
* @param kernel Convolution kernel.
* @param x Pixel the convolution is performed at.
* @param y Pixel the convolution is performed at.
* @return Value of the convolution
*/
public static long convolveSparse(GrayS64 integral , IntegralKernel kernel , int x , int y )
{
return ImplIntegralImageOps.convolveSparse(integral,kernel,x,y);
}
/**
*
* Computes the value of a block inside an integral image without bounds checking. The block is
* defined as follows: x0 < x ≤ x1 and y0 < y ≤ y1.
*
*
* @param integral Integral image.
* @param x0 Lower bound of the block. Exclusive.
* @param y0 Lower bound of the block. Exclusive.
* @param x1 Upper bound of the block. Inclusive.
* @param y1 Upper bound of the block. Inclusive.
* @return Value inside the block.
*/
public static double block_unsafe(GrayF64 integral , int x0 , int y0 , int x1 , int y1 )
{
return ImplIntegralImageOps.block_unsafe(integral,x0,y0,x1,y1);
}
/**
*
* Computes the value of a block inside an integral image without bounds checking. The block is
* defined as follows: x0 < x ≤ x1 and y0 < y ≤ y1.
*
*
* @param integral Integral image.
* @param x0 Lower bound of the block. Exclusive.
* @param y0 Lower bound of the block. Exclusive.
* @param x1 Upper bound of the block. Inclusive.
* @param y1 Upper bound of the block. Inclusive.
* @return Value inside the block.
*/
public static float block_unsafe(GrayF32 integral , int x0 , int y0 , int x1 , int y1 )
{
return ImplIntegralImageOps.block_unsafe(integral,x0,y0,x1,y1);
}
/**
*
* Computes the value of a block inside an integral image without bounds checking. The block is
* defined as follows: x0 < x ≤ x1 and y0 < y ≤ y1.
*
*
* @param integral Integral image.
* @param x0 Lower bound of the block. Exclusive.
* @param y0 Lower bound of the block. Exclusive.
* @param x1 Upper bound of the block. Inclusive.
* @param y1 Upper bound of the block. Inclusive.
* @return Value inside the block.
*/
public static int block_unsafe(GrayS32 integral , int x0 , int y0 , int x1 , int y1 )
{
return ImplIntegralImageOps.block_unsafe(integral, x0, y0, x1, y1);
}
/**
*
* Computes the value of a block inside an integral image without bounds checking. The block is
* defined as follows: x0 < x ≤ x1 and y0 < y ≤ y1.
*
*
* @param integral Integral image.
* @param x0 Lower bound of the block. Exclusive.
* @param y0 Lower bound of the block. Exclusive.
* @param x1 Upper bound of the block. Inclusive.
* @param y1 Upper bound of the block. Inclusive.
* @return Value inside the block.
*/
public static long block_unsafe(GrayS64 integral , int x0 , int y0 , int x1 , int y1 )
{
return ImplIntegralImageOps.block_unsafe(integral, x0, y0, x1, y1);
}
/**
*
* Computes the value of a block inside an integral image and treats pixels outside of the
* image as zero. The block is defined as follows: x0 < x ≤ x1 and y0 < y ≤ y1.
*
*
* @param integral Integral image.
* @param x0 Lower bound of the block. Exclusive.
* @param y0 Lower bound of the block. Exclusive.
* @param x1 Upper bound of the block. Inclusive.
* @param y1 Upper bound of the block. Inclusive.
* @return Value inside the block.
*/
public static float block_zero(GrayF32 integral , int x0 , int y0 , int x1 , int y1 )
{
return ImplIntegralImageOps.block_zero(integral,x0,y0,x1,y1);
}
/**
*
* Computes the value of a block inside an integral image and treats pixels outside of the
* image as zero. The block is defined as follows: x0 < x ≤ x1 and y0 < y ≤ y1.
*
*
* @param integral Integral image.
* @param x0 Lower bound of the block. Exclusive.
* @param y0 Lower bound of the block. Exclusive.
* @param x1 Upper bound of the block. Inclusive.
* @param y1 Upper bound of the block. Inclusive.
* @return Value inside the block.
*/
public static double block_zero(GrayF64 integral , int x0 , int y0 , int x1 , int y1 )
{
return ImplIntegralImageOps.block_zero(integral,x0,y0,x1,y1);
}
/**
*
* Computes the value of a block inside an integral image and treats pixels outside of the
* image as zero. The block is defined as follows: x0 < x ≤ x1 and y0 < y ≤ y1.
*
*
* @param integral Integral image.
* @param x0 Lower bound of the block. Exclusive.
* @param y0 Lower bound of the block. Exclusive.
* @param x1 Upper bound of the block. Inclusive.
* @param y1 Upper bound of the block. Inclusive.
* @return Value inside the block.
*/
public static int block_zero(GrayS32 integral , int x0 , int y0 , int x1 , int y1 )
{
return ImplIntegralImageOps.block_zero(integral,x0,y0,x1,y1);
}
/**
*
* Computes the value of a block inside an integral image and treats pixels outside of the
* image as zero. The block is defined as follows: x0 < x ≤ x1 and y0 < y ≤ y1.
*
*
* @param integral Integral image.
* @param x0 Lower bound of the block. Exclusive.
* @param y0 Lower bound of the block. Exclusive.
* @param x1 Upper bound of the block. Inclusive.
* @param y1 Upper bound of the block. Inclusive.
* @return Value inside the block.
*/
public static long block_zero(GrayS64 integral , int x0 , int y0 , int x1 , int y1 )
{
return ImplIntegralImageOps.block_zero(integral,x0,y0,x1,y1);
}
/**
* Prints out the kernel.
*
* @param kernel THe kernel which is to be printed.
*/
public static void print( IntegralKernel kernel )
{
int x0 = 0,x1=0,y0=0,y1=0;
for( ImageRectangle k : kernel.blocks) {
if( k.x0 < x0 )
x0 = k.x0;
if( k.y0 < y0 )
y0 = k.y0;
if( k.x1 > x1 )
x1 = k.x1;
if( k.y1 > y1 )
y1 = k.y1;
}
int w = x1-x0;
int h = y1-y0;
int sum[] = new int[ w*h ];
for( int i = 0; i < kernel.blocks.length; i++ ) {
ImageRectangle r = kernel.blocks[i];
int value = kernel.scales[i];
for( int y = r.y0; y < r.y1; y++ ) {
int yy = y-y0;
for( int x = r.x0; x < r.x1; x++ ) {
int xx = x - x0;
sum[ yy*w + xx ] += value;
}
}
}
System.out.println("IntegralKernel: TL = ("+(x0+1)+","+(y0+1)+") BR=("+x1+","+y1+")");
for( int y = 0; y < h; y++ ) {
for( int x = 0; x < w; x++ ) {
System.out.printf("%4d ",sum[y*w+x]);
}
System.out.println();
}
}
/**
* Checks to see if the kernel is applied at this specific spot if all the pixels
* would be inside the image bounds or not
*
* @param x location where the kernel is applied. x-axis
* @param y location where the kernel is applied. y-axis
* @param kernel The kernel
* @param width Image's width
* @param height Image's height
* @return true if in bounds and false if out of bounds
*/
public static boolean isInBounds( int x , int y , IntegralKernel kernel , int width , int height )
{
for(ImageRectangle r : kernel.blocks ) {
if( x+r.x0 < 0 || y+r.y0 < 0 )
return false;
if( x+r.x1 >= width || y+r.y1 >= height )
return false;
}
return true;
}
}