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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.struct.image.*;
/**
* Provides a mechanism to call {@link IntegralImageOps} with unknown types at compile time.
*
* @author Peter Abeles
*/
@SuppressWarnings({"unchecked"})
public class GIntegralImageOps {
/**
* Given the input image, return the type of image the integral image should be.
*/
public static , II extends ImageGray>
Class getIntegralType( Class inputType ) {
if( inputType == GrayF32.class ) {
return (Class)GrayF32.class;
} else if( inputType == GrayU8.class ){
return (Class)GrayS32.class;
} else if( inputType == GrayS32.class ){
return (Class)GrayS32.class;
} else {
throw new IllegalArgumentException("Unknown input image type: "+inputType.getSimpleName());
}
}
/**
* 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 , T extends ImageGray>
T transform( I input , T transformed ) {
if( input instanceof GrayF32) {
return (T)IntegralImageOps.transform((GrayF32)input,(GrayF32)transformed);
} else if( input instanceof GrayF64) {
return (T)IntegralImageOps.transform((GrayF64)input,(GrayF64)transformed);
} else if( input instanceof GrayU8) {
return (T)IntegralImageOps.transform((GrayU8)input,(GrayS32)transformed);
} else if( input instanceof GrayS32) {
return (T)IntegralImageOps.transform((GrayS32)input,(GrayS32)transformed);
} else if( input instanceof GrayS64) {
return (T)IntegralImageOps.transform((GrayS64)input,(GrayS64)transformed);
} else {
throw new IllegalArgumentException("Unknown input type: "+input.getClass().getSimpleName());
}
}
/**
* 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 >
T convolve( T integral ,
IntegralKernel kernel,
T output ) {
if( integral instanceof GrayF32) {
return (T)IntegralImageOps.convolve((GrayF32)integral,kernel,(GrayF32)output);
} else if( integral instanceof GrayF64) {
return (T)IntegralImageOps.convolve((GrayF64)integral,kernel,(GrayF64)output);
} else if( integral instanceof GrayS32) {
return (T)IntegralImageOps.convolve((GrayS32)integral,kernel,(GrayS32)output);
} else if( integral instanceof GrayS64) {
return (T)IntegralImageOps.convolve((GrayS64)integral,kernel,(GrayS64)output);
} else {
throw new IllegalArgumentException("Unknown input type: "+integral.getClass().getSimpleName());
}
}
/**
* 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 >
T convolveBorder( T integral ,
IntegralKernel kernel,
T output , int borderX , int borderY ) {
if( integral instanceof GrayF32) {
return (T)IntegralImageOps.convolveBorder((GrayF32)integral,kernel,(GrayF32)output,borderX,borderY);
} else if( integral instanceof GrayF64) {
return (T)IntegralImageOps.convolveBorder((GrayF64)integral,kernel,(GrayF64)output,borderX,borderY);
} else if( integral instanceof GrayS32) {
return (T)IntegralImageOps.convolveBorder((GrayS32)integral,kernel,(GrayS32)output,borderX,borderY);
} else if( integral instanceof GrayS64) {
return (T)IntegralImageOps.convolveBorder((GrayS64)integral,kernel,(GrayS64)output,borderX,borderY);
} else {
throw new IllegalArgumentException("Unknown input type");
}
}
/**
* 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( T integral ,
IntegralKernel kernel ,
int x , int y ) {
if( integral instanceof GrayF32) {
return IntegralImageOps.convolveSparse((GrayF32)integral,kernel,x,y);
} else if( integral instanceof GrayF64) {
return IntegralImageOps.convolveSparse((GrayF64)integral,kernel,x,y);
} else if( integral instanceof GrayS32) {
return IntegralImageOps.convolveSparse((GrayS32)integral,kernel,x,y);
} else if( integral instanceof GrayS64) {
return IntegralImageOps.convolveSparse((GrayS64)integral,kernel,x,y);
} else {
throw new IllegalArgumentException("Unknown input type");
}
}
/**
*
* 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( T integral , int x0 , int y0 , int x1 , int y1 )
{
if( integral instanceof GrayF32) {
return IntegralImageOps.block_zero((GrayF32)integral,x0,y0,x1,y1);
} else if( integral instanceof GrayF64) {
return IntegralImageOps.block_zero((GrayF64)integral,x0,y0,x1,y1);
} else if( integral instanceof GrayS32) {
return IntegralImageOps.block_zero((GrayS32)integral,x0,y0,x1,y1);
} else if( integral instanceof GrayS64) {
return IntegralImageOps.block_zero((GrayS64)integral,x0,y0,x1,y1);
} else {
throw new IllegalArgumentException("Unknown input type");
}
}
/**
*
* 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( T integral , int x0 , int y0 , int x1 , int y1 )
{
if( integral instanceof GrayF32) {
return IntegralImageOps.block_unsafe((GrayF32)integral,x0,y0,x1,y1);
} else if( integral instanceof GrayF64) {
return IntegralImageOps.block_unsafe((GrayF64)integral,x0,y0,x1,y1);
} else if( integral instanceof GrayS32) {
return IntegralImageOps.block_unsafe((GrayS32)integral,x0,y0,x1,y1);
} else if( integral instanceof GrayS64) {
return IntegralImageOps.block_unsafe((GrayS64)integral,x0,y0,x1,y1);
} else {
throw new IllegalArgumentException("Unknown input type");
}
}
}