/**
* デバック用の関数です。 ヒストグラムをラスタに書き出します。
*
* @param i_output 書き出し先のラスタオブジェクト 256ピクセル以上の幅があること。
*/
public void debugDrawHistgramMap(IFLARRaster i_input, IFLARRaster i_output) throws FLARException {
IFLARBufferReader in_buffer_reader = i_input.getBufferReader();
IFLARBufferReader out_buffer_reader = i_output.getBufferReader();
assert (in_buffer_reader.isEqualBufferType(IFLARBufferReader.BUFFERFORMAT_INT2D_GLAY_8));
assert (out_buffer_reader.isEqualBufferType(IFLARBufferReader.BUFFERFORMAT_INT2D_GLAY_8));
FLARIntSize size = i_output.getSize();
int[][] out_buf = (int[][]) out_buffer_reader.getBuffer();
// 0で塗りつぶし
for (int y = 0; y < size.h; y++) {
for (int x = 0; x < size.w; x++) {
out_buf[y][x] = 0;
}
}
// ヒストグラムを計算
int[] histgram = new int[256];
int threshold = createHistgram(in_buffer_reader, i_input.getSize(), histgram);
// ヒストグラムの最大値を出す
int max_v = 0;
for (int i = 0; i < 255; i++) {
if (max_v < histgram[i]) {
max_v = histgram[i];
}
}
// 目盛り
for (int i = 0; i < size.h; i++) {
out_buf[i][0] = 128;
out_buf[i][128] = 128;
out_buf[i][255] = 128;
}
// スケーリングしながら描画
for (int i = 0; i < 255; i++) {
out_buf[histgram[i] * (size.h - 1) / max_v][i] = 255;
}
// 値
for (int i = 0; i < size.h; i++) {
out_buf[i][threshold] = 255;
}
return;
}
private int createHistgram(IFLARBufferReader i_reader, FLARIntSize i_size, int[] o_histgram)
throws FLARException {
int[][] in_buf = (int[][]) i_reader.getBuffer();
int[] histgram = o_histgram;
// ヒストグラムを作成
for (int i = 0; i < 256; i++) {
histgram[i] = 0;
}
int sum = 0;
for (int y = 0; y < i_size.h; y++) {
int sum2 = 0;
for (int x = 0; x < i_size.w; x++) {
int v = in_buf[y][x];
histgram[v]++;
sum2 += v;
}
sum = sum + sum2 / i_size.w;
}
// 閾値ピクセル数確定
int th_pixcels = i_size.w * i_size.h * this._persentage / 100;
// 閾値判定
int i;
if (th_pixcels > 0) {
// 黒点基準
for (i = 0; i < 254; i++) {
th_pixcels -= histgram[i];
if (th_pixcels <= 0) {
break;
}
}
} else {
// 白点基準
for (i = 255; i > 1; i--) {
th_pixcels += histgram[i];
if (th_pixcels >= 0) {
break;
}
}
}
// 閾値の保存
return i;
}
public void doFilter(IFLARRaster i_input, IFLARRaster i_output) throws FLARException {
IFLARBufferReader in_buffer_reader = i_input.getBufferReader();
IFLARBufferReader out_buffer_reader = i_output.getBufferReader();
assert (in_buffer_reader.isEqualBufferType(IFLARBufferReader.BUFFERFORMAT_INT2D_GLAY_8));
assert (out_buffer_reader.isEqualBufferType(IFLARBufferReader.BUFFERFORMAT_INT2D_GLAY_8));
assert (i_input.getSize().isEqualSize(i_output.getSize()) == true);
int[][] out_buf = (int[][]) out_buffer_reader.getBuffer();
int[][] in_buf = (int[][]) in_buffer_reader.getBuffer();
int bp = 0;
FLARIntSize size = i_output.getSize();
for (int y = 1; y < size.h; y++) {
int prev = 128;
for (int x = 1; x < size.w; x++) {
int w = in_buf[y][x];
out_buf[y][x] = (Math.abs(w - prev) + Math.abs(w - in_buf[y - 1][x])) / 2;
prev = w;
bp += 3;
}
}
return;
}
public void analyzeRaster(IFLARRaster i_input) throws FLARException {
final IFLARBufferReader buffer_reader = i_input.getBufferReader();
assert (buffer_reader.isEqualBufferType(IFLARBufferReader.BUFFERFORMAT_INT2D_GLAY_8));
int[] histgram = new int[256];
this._threshold = createHistgram(buffer_reader, i_input.getSize(), histgram);
}
