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#ifndef STIM_IMAGE_H
#define STIM_IMAGE_H
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#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
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#include <vector>
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#include <iostream>
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#include <limits>
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namespace stim{
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/// This static class provides the STIM interface for loading, saving, and storing 2D images.
/// Data is stored in an interleaved (BIP) format (default for saving and loading is RGB).
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//currently this interface uses CImg
// T = data type (usually unsigned char)
template <class T>
class image{
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//cimg_library::CImg<T> img;
T* img; //pointer to the image data (assumes RGB for loading/saving)
size_t R[3];
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size_t X() const { return R[1]; }
size_t Y() const { return R[2]; }
size_t C() const { return R[0]; }
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size_t bytes(){ return size() * sizeof(T); }
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void init(){ //initializes all variables, assumes no memory is allocated
memset(R, 0, sizeof(size_t) * 3); //set the resolution and number of channels to zero
img = NULL;
}
void unalloc(){ //frees any resources associated with the image
if(img) free(img); //if memory has been allocated, free it
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img=NULL;
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}
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void clear(){ //clears all image data
unalloc(); //unallocate previous memory
init(); //re-initialize the variables
}
void allocate(){
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unalloc();
img = (T*) malloc( bytes() ); //allocate memory
memset(img, 0, bytes());
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}
void allocate(size_t x, size_t y, size_t c){ //allocate memory based on the resolution
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unalloc();
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R[0] = c; R[1] = x; R[2] = y; //set the resolution
allocate(); //allocate memory
}
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size_t idx(size_t x, size_t y, size_t c = 0){
return y * C() * X() + x * C() + c;
}
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int cv_type(){
if(std::is_same<T, unsigned char>::value) return CV_MAKETYPE(CV_8U, (int)C());
if(std::is_same<T, char>::value) return CV_MAKETYPE(CV_8S, (int)C());
if(std::is_same<T, unsigned short>::value) return CV_MAKETYPE(CV_16U, (int)C());
if(std::is_same<T, short>::value) return CV_MAKETYPE(CV_16S, (int)C());
if(std::is_same<T, int>::value) return CV_MAKETYPE(CV_32S, (int)C());
if(std::is_same<T, float>::value) return CV_MAKETYPE(CV_32F, (int)C());
if(std::is_same<T, double>::value) return CV_MAKETYPE(CV_64F, (int)C());
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std::cout<<"ERROR in stim::image::cv_type - no valid data type found"<<std::endl;
exit(1);
}
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/// Returns the value for "white" based on the dynamic range (assumes white is 1.0 for floating point images)
T white(){
if(std::is_same<T, unsigned char>::value) return UCHAR_MAX;
if(std::is_same<T, unsigned short>::value) return SHRT_MAX;
if(std::is_same<T, unsigned>::value) return UINT_MAX;
if(std::is_same<T, unsigned long>::value) return ULONG_MAX;
if(std::is_same<T, unsigned long long>::value) return ULLONG_MAX;
if(std::is_same<T, float>::value) return 1.0f;
if(std::is_same<T, double>::value) return 1.0;
std::cout<<"ERROR in stim::image::white - no white value known for this data type"<<std::endl;
}
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public:
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/// Default constructor - creates an empty image object
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image(){ init(); } //initialize all variables to zero, don't allocate any memory
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/// Constructor with a filename - loads the specified file
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image(std::string filename){ //constructor initialize the image with an image file
init();
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load(filename);
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}
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/// Create a new image from scratch given a number of samples and channels
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image(size_t x, size_t y = 1, size_t c = 1){
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init();
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allocate(x, y, c);
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}
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/// Create a new image with the data given in 'data'
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image(T* data, size_t x, size_t y, size_t c = 1){
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init();
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allocate(x, y, c);
memcpy(img, data, bytes());
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}
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/// Copy constructor - duplicates an image object
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image(const stim::image<T>& I){
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init();
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allocate(I.X(), I.Y(), I.C());
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memcpy(img, I.img, bytes());
}
/// Destructor - clear memory
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~image(){
free(img);
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}
stim::image<T> operator=(const stim::image<T>& I){
if(&I == this) //handle self-assignment
return *this;
allocate(I.X(), I.Y(), I.C());
memcpy(img, I.img, bytes());
return *this;
}
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/// Load an image from a file
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void load(std::string filename){
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cv::Mat cvImage = cv::imread(filename, CV_LOAD_IMAGE_UNCHANGED); //use OpenCV to open the image file
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if(!cvImage.data){
std::cout<<"ERROR stim::image::load() - unable to find image "<<filename<<std::endl;
exit(1);
}
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allocate(cvImage.cols, cvImage.rows, cvImage.channels()); //allocate space for the image
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T* cv_ptr = (T*) cvImage.data;
if(C() == 1)
{
//if this is a single-color image, just copy the data
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memcpy(img, cv_ptr, bytes());
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}
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if(C() == 3)
{ //if this is a 3-color image, OpenCV uses BGR interleaving
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set_interleaved_bgr(cv_ptr, X(), Y());
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}
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cvImage.release();
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}
//save a file
void save(std::string filename){
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//OpenCV uses an interleaved format, so convert first and then output
T* buffer = (T*) malloc(bytes());
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if(C() == 1)
memcpy(buffer, img, bytes());
else if(C() == 3)
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get_interleaved_bgr(buffer);
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cv::Mat cvImage((int)Y(), (int)X(), cv_type(), buffer);
cv::imwrite(filename, cvImage);
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cvImage.release();
free(buffer);
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}
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//create an image from an interleaved buffer
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void set_interleaved_rgb(T* buffer, size_t width, size_t height, size_t channels = 3){
allocate(width, height, channels);
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memcpy(img, buffer, bytes());
}
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void set_interleaved_bgr(T* buffer, size_t width, size_t height, size_t channels = 3){
allocate(width, height, channels);
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for(size_t c = 0; c < C(); c++){ //copy directly
for(size_t y = 0; y < Y(); y++){
for(size_t x = 0; x < X(); x++){
img[idx(x, y, c)] = buffer[y * X() * C() + x * C() + (2-c)];
}
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}
}
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}
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void get_interleaved_bgr(T* data){
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//for each channel
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for(size_t y = 0; y < Y(); y++){
for(size_t x = 0; x < X(); x++){
for(size_t c = 0; c < C(); c++){
data[y * X() * C() + x * C() + (2-c)] = img[idx(x, y, c)];
}
}
}
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}
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void get_interleaved_rgb(T* data){
memcpy(data, img, bytes());
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image<T> channel(size_t c){
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//create a new image
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image<T> r(X(), Y(), 1);
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for(size_t x = 0; x < X(); x++){
for(size_t y = 0; y < Y(); y++){
r.img[r.idx(x, y, c)] = img[idx(x, y, c)];
}
}
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return r;
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}
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T& operator()(size_t x, size_t y, size_t c = 0){
return img[idx(x, y, c)];
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}
/// Set all elements in the image to a given scalar value
/// @param v is the value used to set all values in the image
image<T> operator=(T v){
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size_t N = size();
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for(size_t n = 0; n < N; n++)
img[n] = v;
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return *this;
}
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/// Copy the given data to the specified channel
/// @param c is the channel number that the data will be copied to
/// @param buffer is a pointer to the image to be copied to channel c
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void set_channel(T* buffer, size_t c){
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size_t x, y;
for(y = 0; y < Y(); y++){
for(x = 0; x < X(); x++){
img[idx(x, y, c)] = buffer[c];
}
}
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}
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size_t channels(){
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return C();
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}
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size_t width(){
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return X();
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}
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size_t height(){
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return Y();
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}
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T* data(){
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return img;
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}
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//returns the size (number of values) of the image
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size_t size(){ return C() * X() * Y(); }
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/// Returns the number of nonzero values
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size_t nnz(){
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size_t N = X() * Y() * C();
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size_t nz = 0;
for(size_t n = 0; n < N; n++)
if(img[n] != 0) nz++;
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return nz; //return the number of nonzero pixels
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}
//this function returns indices of pixels that have nonzero values
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std::vector<size_t> sparse_idx(){
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std::vector<size_t> s; //allocate an array
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s.resize(nnz()); //allocate space in the array
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size_t N = size();
//size_t C = channels();
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//T* ptr = img.data(); //get a pointer to the image data
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size_t i = 0;
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for(size_t n = 0; n < N; n++){
if(img[n] != 0){
s[i] = n;
i++;
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}
}
return s; //return the index list
}
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/// Returns the maximum pixel value in the image
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T maxv(){
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T max_val = img[0]; //initialize the maximum value to the first one
size_t N = size(); //get the number of pixels
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for (size_t n=0; n<N; n++){ //for every value
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if (img[n] > max_val){ //if the value is higher than the current max
max_val = img[n];
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}
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}
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return max_val;
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}
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/// Returns the maximum pixel value in the image
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T minv(){
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T min_val = img[0]; //initialize the maximum value to the first one
size_t N = size(); //get the number of pixels
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for (size_t n=0; n<N; n++){ //for every value
if (img[n] < min_val){ //if the value is higher than the current max
min_val = img[n];
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}
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}
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return min_val;
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}
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/// Invert an image by calculating I1 = alpha - I0, where alpha is the maximum image value
image<T> invert(T white_val){
size_t N = size(); //calculate the total number of values in the image
image<T> r(X(), Y(), C()); //allocate space for the resulting image
for(size_t n = 0; n < N; n++)
r.img[n] = white_val - img[n]; //perform the inversion
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return r; //return the inverted image
}
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/// Invert an image by calculating I1 = alpha - I0, where alpha is the maximum image value
image<T> invert(){
size_t N = size(); //calculate the total number of values in the image
image<T> r(X(), Y(), C()); //allocate space for the resulting image
T white_val = maxv();
for(size_t n = 0; n < N; n++)
r.img[n] = white_val - img[n]; //perform the inversion
return r; //return the inverted image
}
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///crops the image from x1 to x0 and y1 to y0 and returns a new (smaller) image.
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image<T> crop(int x0, int x1, int y0, int y1)
{
image<T> ret(x1-x0, y1-y0, C());
int newWidth = x1-x0;
int destidx, srcidx;
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///for each row, cut what amount of data from the original and put it into the new copy.
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for(int i = 0; i < (y1-y0); i++)
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{
destidx = i*newWidth*C(); ///destination index one per each row
srcidx = ((i+(y0))*X()+x0)*C(); ///source index, one per each row.
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memcpy(&ret.img[destidx], &img[srcidx], sizeof(T)*newWidth*C());
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}
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return ret;
}
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image<T> srgb2lab(){
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std::cout<<"ERROR stim::image::srgb2lab - function has been broken, re-implement."<<std::endl;
exit(1);
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}
image<T> convolve2(image<T> mask){
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std::cout<<"ERROR stim::image::convolve2 - function has been broken, and shouldn't really be in here."<<std::endl;
exit(1);
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}
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image<T> rotate(float angle, float cx, float cy){
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|
std::cout<<"ERROR stim::image::rotate - function has been broken, and shouldn't really be in here."<<std::endl;
exit(1);
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393
|
}
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394
|
|
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|
395
|
|
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|
396
397
|
// leila's code for non_interleaving data in 3D
//create an data set from an interleaved buffer
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void set_interleaved3(T* buffer, size_t width, size_t height, size_t depth, size_t channels = 3){
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|
std::cout<<"ERROR stim::image::set_interleaved3 - stim::image no longer supports 3D images."<<std::endl;
exit(1);
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|
401
|
}
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|
402
|
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};
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}; //end namespace stim
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#endif
|