/* Returns the unique set of pixel values present in the given ImageData.
* @param
* o the ImageData explored for this set
*/
public ArrayList unique(ImageData o) {
int pixel_values[] = new int[256]; // use for counting pixel values actually seen
ArrayList<Double> list =
new ArrayList(); // use for storing only those pixel values that are non-zero when it's all
// said and done
// initialize pixel value array
// for (int i=0; i < 256; i++) { pixel_values[i] = 0; }
for (int i = 0; i < 255; i++) {
pixel_values[i] = 0;
}
// walk and count pixel values
for (int row = 0; row < o.getNumRows(); row++) {
for (int col = 0; col < o.getNumCols(); col++) {
for (int band = 0; band < o.getNumBands(); band++) {
pixel_values[o.getInt(row, col, band)]++;
}
}
}
// identify and collect only unique pixel values (i.e., those with non-zero counts)
int total_unique = 0;
// for (int i=0; i < 256; i++) {
for (int i = 0; i < 255; i++) {
if (pixel_values[i] != 0) {
list.add(new Double(i));
}
}
return list;
}
/*
* Implements a "logical negation" operation for a single ImageData object.
* @param o
* The ImageData object to be negated.
*/
public ImageData match(ImageData o, double value) {
int pixel;
ImageData r = new ImageData();
try {
r =
(ImageData)
o
.clone(); // BJL: This algorithm assumes the input images are the same size, so
// can choose either one as a template for the result.
} catch (Exception e) {
System.out.println(e.getMessage());
return null;
}
for (int row = 0; row < r.getNumRows(); row++) {
for (int col = 0; col < r.getNumCols(); col++) {
for (int band = 0; band < r.getNumBands(); band++) {
pixel = o.getInt(row, col, band);
if (pixel == (int) value) {
r.set(row, col, band, 1); // if pixel = value, set it to 1
} else {
r.set(row, col, band, 0); // otherwise, set it to 0
}
}
}
}
return r;
}
/*
* Implements an element-wise addition operation for a pair of ImageData objects.
* @param o1
* The first ImageData object
* @param o2
* The second ImageData object
*/
public ImageData add(ImageData o1, ImageData o2) {
double pixel1 = 0.0;
double pixel2 = 0.0;
double value = 0.0;
ImageData r = new ImageData();
try {
r =
(ImageData)
o1
.clone(); // BJL: This algorithm assumes the input images are the same size, so
// can choose either one as a template for the result.
} catch (Exception e) {
System.out.println(e.getMessage());
return null;
}
for (int row = 0; row < r.getNumRows(); row++) {
for (int col = 0; col < r.getNumCols(); col++) {
for (int band = 0; band < r.getNumBands(); band++) {
pixel1 = o1.getInt(row, col, band);
pixel2 = o2.getInt(row, col, band);
value = pixel1 + pixel2;
r.set(row, col, band, value);
}
}
}
return r;
}
/*
* Converts an input image object to a binary one (with each pixel value taking on only 1 or 0).
* @param o
* input image object to be converted
*/
public ImageData logical(ImageData o) {
ImageData r = new ImageData();
int pixel;
try {
r = (ImageData) o.clone();
} catch (Exception e) {
System.out.println(e.getMessage());
return null;
}
// System.out.println("logical:");
for (int row = 0; row < r.getNumRows(); row++) {
for (int col = 0; col < r.getNumCols(); col++) {
for (int band = 0; band < r.getNumBands(); band++) {
pixel = r.getInt(row, col, band);
// System.out.print(""+pixel + " ");
if (pixel > 0) {
r.set(row, col, band, 1); // if pixel > 0, set it to 1
} else {
r.set(row, col, band, 0); // otherwise, set it to 0
}
}
}
// System.out.println("");
}
// System.out.println(">logical.");
return r;
}
/*
* Returns the sum of the pixel values of a given ImageData.
* @param o
* The ImageData providing pixels to be counted
*/
public double sum(ImageData o) {
double sum = 0;
for (int row = 0; row < o.getNumRows(); row++) {
for (int col = 0; col < o.getNumCols(); col++) {
for (int band = 0; band < o.getNumBands(); band++) {
sum += o.getValue(row, col, band);
}
}
}
return sum;
}
public ArrayList vectorize(ImageData o) {
ArrayList list = new ArrayList();
for (int row = 0; row < o.getNumRows(); row++) {
for (int col = 0; col < o.getNumCols(); col++) {
for (int band = 0; band < o.getNumBands(); band++) {
list.add(new Double(o.getValue(row, col, band)));
}
}
}
return list;
}
public boolean equals(ImageData a) {
if (rows != a.getNumRows()) return false;
if (cols != a.getNumCols()) return false;
if (bands != a.getNumBands()) return false;
double[][][] avals = a.getValues();
int len1 = values.length;
int len2 = values[0].length;
int len3 = values[0][0].length;
for (int i = 0; i < len1; i++)
for (int j = 0; j < len2; j++)
for (int k = 0; k < len3; k++) if (values[i][j][k] != avals[i][j][k]) return false;
return true;
}
/*
* Traverses the original and mask images in tandem.
* The mask should be identical to the original except it
* should have been preselected to be a binary image.
*
* Wherever the mask has a 1 value, add that pixel value to
* the list.
*
* Return the list unsorted and only containing pixel values of
* the original matching a corresponding mask 1-value.
*
* @param orig
* The original ImageData image
* @param mask
* The corresponding ImageData mask (having identical dimensions and containing binary values)
*
*/
public ArrayList mask(ImageData orig, ImageData mask) {
ArrayList list =
new ArrayList(); // a column-wise traversal of the input images populates this 1D list
for (int col = 0; col < orig.getNumCols(); col++) {
for (int row = 0; row < orig.getNumRows(); row++) {
for (int band = 0; band < orig.getNumBands(); band++) {
if (mask.getValue(row, col, band) == 1) {
list.add(new Double(orig.getValue(row, col, band)));
}
}
}
}
return list;
}
/*
* Implements a "logical or" operation for a pair of ImageData objects.
* @param o1
* The first ImageData object
* @param o2
* The second ImageData object
*/
public ImageData or(ImageData o1, ImageData o2) {
int pixel_o1;
int pixel_o2;
ImageData r = new ImageData();
ImageData bin_o1 =
logical(
o1); // BJL: We convert them to logical/binary form by default. Helpful if not
// unconverted. Otherwise, this action is redundant. Covered both cases here.
ImageData bin_o2 = logical(o2);
try {
r =
(ImageData)
o1
.clone(); // BJL: This algorithm assumes the input images are the same size, so
// can choose either one as a template for the result.
} catch (Exception e) {
System.out.println(e.getMessage());
return null;
}
for (int row = 0; row < r.getNumRows(); row++) {
for (int col = 0; col < r.getNumCols(); col++) {
for (int band = 0; band < r.getNumBands(); band++) {
pixel_o1 = bin_o1.getInt(row, col, band);
pixel_o2 = bin_o2.getInt(row, col, band);
if ((pixel_o1 == 1) || (pixel_o2 == 1)) {
r.set(row, col, band, 1); // if either pixel is 1, set it to 1
} else {
r.set(row, col, band, 0); // otherwise, set it to 0
}
}
}
}
return r;
}
/*
* Implements a "logical negation" operation for a single ImageData object.
* @param o
* The ImageData object to be negated.
*/
public ImageData not(ImageData o) {
int pixel;
ImageData r = new ImageData();
ImageData bin_o = logical(o);
try {
r =
(ImageData)
bin_o
.clone(); // BJL: This algorithm assumes the input images are the same size, so
// can choose either one as a template for the result.
} catch (Exception e) {
System.out.println(e.getMessage());
return null;
}
// System.out.println("not:");
for (int row = 0; row < r.getNumRows(); row++) {
for (int col = 0; col < r.getNumCols(); col++) {
for (int band = 0; band < r.getNumBands(); band++) {
pixel = bin_o.getInt(row, col, band);
// System.out.print(""+pixel+" ");
if (pixel == 1) {
r.set(row, col, band, 0); // if pixel = 1, set it to 0
} else {
r.set(row, col, band, 1); // otherwise, set it to 1
}
}
}
// System.out.println();
}
// System.out.println(">not.");
return r;
}