ithuriel
级别: 新手上路
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注册时间:2005-09-14
最后登录:2008-04-13
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JAVA的图像文件读取
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.image.MemoryImageSource;
import java.io.FileInputStream;
import java.io.IOException;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JScrollPane;
public class BMP{
public static float[][] Pixels;
public static int constructInt(byte[] in, int offset) {
int ret = ((int) in[offset + 3] & 0xff);
ret = (ret << 8) | ((int) in[offset + 2] & 0xff);
ret = (ret << 8) | ((int) in[offset + 1] & 0xff);
ret = (ret << 8) | ((int) in[offset + 0] & 0xff);
return (ret);
}
public static int constructInt3(byte[] in, int offset) {
int ret = 0xff;
ret = (ret << 8) | ((int) in[offset + 2] & 0xff);
ret = (ret << 8) | ((int) in[offset + 1] & 0xff);
ret = (ret << 8) | ((int) in[offset + 0] & 0xff);
return (ret);
}
public static long constructLong(byte[] in, int offset) {
long ret = ((long) in[offset + 7] & 0xff);
ret |= (ret << 8) | ((long) in[offset + 6] & 0xff);
ret |= (ret << 8) | ((long) in[offset + 5] & 0xff);
ret |= (ret << 8) | ((long) in[offset + 4] & 0xff);
ret |= (ret << 8) | ((long) in[offset + 3] & 0xff);
ret |= (ret << 8) | ((long) in[offset + 2] & 0xff);
ret |= (ret << 8) | ((long) in[offset + 1] & 0xff);
ret |= (ret << 8) | ((long) in[offset + 0] & 0xff);
return (ret);
}
public static double constructDouble(byte[] in, int offset) {
long ret = constructLong(in, offset);
return (Double.longBitsToDouble(ret));
}
public static short constructShort(byte[] in, int offset) {
short ret = (short) ((short) in[offset + 1] & 0xff);
ret = (short) ((ret << 8) | (short) ((short) in[offset + 0] & 0xff));
return (ret);
}
static class BitmapHeader {
public int nsize;
public int nbisize;
public int nwidth;
public int nheight;
public int nplanes;
public int nbitcount;
public int ncompression;
public int nsizeimage;
public int nxpm;
public int nypm;
public int nclrused;
public int nclrimp;
public void read(FileInputStream fs) throws IOException
{
final int bflen = 14;
byte bf[] = new byte[bflen];
fs.read(bf, 0, bflen);
final int bilen = 40;
byte bi[] = new byte[bilen];
fs.read(bi, 0, bilen);
nsize = constructInt(bf, 2);
nbisize = constructInt(bi, 2);
nwidth = constructInt(bi, 4);
nheight = constructInt(bi, 8);
nplanes = constructShort(bi, 12);
nbitcount = constructShort(bi, 14);
ncompression = constructInt(bi, 16);
nsizeimage = constructInt(bi, 20);
nxpm = constructInt(bi, 24);
nypm = constructInt(bi, 28);
nclrused = constructInt(bi, 32);
nclrimp = constructInt(bi, 36);
}
}
public static float[][] getXY(float[][] inputz){
float[][] returnF = new float[inputz.length][inputz[0].length];
for(int i =0;i<inputz.length;i++){
for(int z =0;z<inputz[0].length;z++){
returnF[z] = inputz[inputz.length-1-i][z];
}
}
return returnF;
}
public static float[][] read(FileInputStream fs)
{
try {
BitmapHeader bh = new BitmapHeader();
bh.read(fs);
/**
if (bh.nbitcount == 24)
return (readMap24(fs, bh));
if (bh.nbitcount == 32)
return (readMap32(fs, bh));
if (bh.nbitcount == 8)
return (readMap8(fs, bh));
**/
if (bh.nbitcount == 24)
return (getXY(readMap24(fs, bh)));
if (bh.nbitcount == 32)
return (getXY(readMap32(fs, bh)));
if (bh.nbitcount == 8)
return (getXY(readMap8(fs, bh)));
fs.close();
} catch (IOException e) {
}
return (null);
}
protected static float[][] readMap32(FileInputStream fs, BitmapHeader bh) throws IOException
{
int ndata[] = new int[bh.nheight * bh.nwidth];
Pixels = new float[bh.nheight][bh.nwidth];
byte brgb[] = new byte[bh.nwidth * 4 * bh.nheight];
fs.read(brgb, 0, bh.nwidth * 4 * bh.nheight);
int nindex = 0;
for (int j = 0; j < bh.nheight; j++)
{
for (int i = 0; i < bh.nwidth; i++)
{
int i1 =ndata[bh.nwidth * (bh.nheight - j - 1) + i] = constructInt3(brgb, nindex);
nindex += 4;
Pixels[j]=i1&0xff;
}
}
fs.close();
return Pixels;
}
protected static float[][] readMap24(FileInputStream fs, BitmapHeader bh)throws IOException
{
int npad = (bh.nsizeimage / bh.nheight) - bh.nwidth * 3;
int ndata[] = new int[bh.nheight * bh.nwidth];
byte brgb[] = new byte[(bh.nwidth + npad) * 3 * bh.nheight];
Pixels = new float[bh.nheight][bh.nwidth];
fs.read(brgb, 0, (bh.nwidth + npad) * 3 * bh.nheight);
int nindex = 0;
for (int j = 0; j < bh.nheight; j++){
for (int i = 0; i < bh.nwidth; i++){
int i1=ndata[bh.nwidth * (bh.nheight - j - 1) + i] = constructInt3(brgb, nindex);
nindex += 3;
Pixels[j]=i1&0xff;
}
nindex += npad;
}
fs.close();
return Pixels;
}
protected static float[][] readMap8(FileInputStream fs, BitmapHeader bh)throws IOException{
int nNumColors = 0;
if (bh.nclrused > 0){
nNumColors = bh.nclrused;
}else{
nNumColors = (1 & 0xff) << bh.nbitcount;
}
if (bh.nsizeimage == 0){
bh.nsizeimage = ((((bh.nwidth * bh.nbitcount) + 31) & ~31) >> 3);
bh.nsizeimage *= bh.nheight;
}
int npalette[] = new int[nNumColors];
byte bpalette[] = new byte[nNumColors * 4];
fs.read(bpalette, 0, nNumColors * 4);
int nindex8 = 0;
for (int n = 0; n < nNumColors; n++){
npalette[n] = constructInt3(bpalette, nindex8);
nindex8 += 4;
}
int npad8 = (bh.nsizeimage / bh.nheight) - bh.nwidth;
int ndata8[] = new int[bh.nwidth * bh.nheight];
byte bdata[] = new byte[(bh.nwidth + npad8) * bh.nheight];
Pixels = new float[bh.nheight][bh.nwidth];
fs.read(bdata, 0, (bh.nwidth + npad8) * bh.nheight);
nindex8 = 0;
for (int j8 = 0; j8 < bh.nheight; j8++){
for (int i8 = 0; i8 < bh.nwidth;i8++){
int i1=ndata8[bh.nwidth * (bh.nheight - j8 - 1) + i8] =
npalette[((int) bdata[nindex8] & 0xff)];
nindex8++;
Pixels[j8][i8]=i1&0xff;
}
nindex8 += npad8;
}
fs.close();
return Pixels;
}
public static float[][] load(String sdir, String sfile) {
return (load(sdir + sfile));
}
public static float[][] load(String sdir){
try{
FileInputStream fs = new FileInputStream(sdir);
return (read(fs));
}catch (IOException ex) {
return (null);
}
}
public static void main(String[] args) throws IOException
{
FileInputStream in = new FileInputStream("G:\\勉強中\\分析数据\\6MIHO KOBAYASHI.bmp");
float[][] TheImage = read(in);
for(int i =0;i<TheImage.length;i++){
String c="";
for(int j=0;j<TheImage[0].length;j++){
c+=TheImage[j]+",";
}
System.out.println(c);
}
}
}
这里是BMP格式，需要注意的是，BMP有8，24，32等三种格式，需要区别对待。但是，医学方面，用的比较多的是24格式。
MAIN的编码是读出该BMP格式的辉度，有关辉度的概念，以后会开一个图像色彩的帖子慢慢的分析。
个人的代码，没什么注释，大家辛苦了。
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大蟑螂
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[楼 主]
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Posted: 2008-04-13 06:19 |
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Cyaline 開発者新技術BBS -> java -> JAVA的图像文件读取
