how to extract the date n time from images

[norazanita]

can anybody help me...what function/ method that i can use to extract the date an time from images

thanks
:(

[Niveditha]

Hi,
Can u provide more details like how your image looks like?
I meant to say does it have date n time printed on it.

[norazanita]

what i want exactly is to extract the metadata from the images/photos (from digicam and such), more specifically the time and date of capture. just want to know if there is such function in java.

[Niveditha]

Hi,
The following code extracts image into a metadata and get the date and time of a image,
It requires something called sanselan for support of images in java

I was not able to post its link as my posts num is not 20.
Do a google on sanselan.zip and you may find it.


Hope it works...


package org.cmc.sanselan.sampleUsage;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;

import org.cmc.sanselan.ImageReadException;
import org.cmc.sanselan.Sanselan;
import org.cmc.sanselan.common.IImageMetadata;
import org.cmc.sanselan.common.RationalNumber;
import org.cmc.sanselan.formats.jpeg.JpegImageMetadata;
import org.cmc.sanselan.formats.tiff.TiffField;
import org.cmc.sanselan.formats.tiff.TiffImageMetadata;
import org.cmc.sanselan.formats.tiff.constants.TagInfo;
import org.cmc.sanselan.formats.tiff.constants.TiffConsta nts;

public class MetadataExample
{
public static void metadataExample(File file) throws ImageReadException,
IOException
{
// get all metadata stored in EXIF format (ie. from JPEG or TIFF).
// org.w3c.dom.Node node = Sanselan.getMetadataObsolete(imageBytes);
IImageMetadata metadata = Sanselan.getMetadata(file);

//System.out.println(metadata);

if (metadata instanceof JpegImageMetadata)
{
JpegImageMetadata jpegMetadata = (JpegImageMetadata) metadata;

// Jpeg EXIF metadata is stored in a TIFF-based directory structure
// and is identified with TIFF tags.
// Here we look for the "x resolution" tag, but
// we could just as easily search for any other tag.
//
// see the TiffConstants file for a list of TIFF tags.

System.out.println("file: " + file.getPath());

// print out various interesting EXIF tags.
printTagValue(jpegMetadata, TiffConstants.TIFF_TAG_XRESOLUTION);
printTagValue(jpegMetadata, TiffConstants.TIFF_TAG_DATE_TIME);
printTagValue(jpegMetadata,
TiffConstants.EXIF_TAG_DATE_TIME_ORIGINAL);
printTagValue(jpegMetadata, TiffConstants.EXIF_TAG_CREATE_DATE);
printTagValue(jpegMetadata, TiffConstants.EXIF_TAG_ISO);
printTagValue(jpegMetadata,
TiffConstants.EXIF_TAG_SHUTTER_SPEED_VALUE);
printTagValue(jpegMetadata, TiffConstants.EXIF_TAG_APERTURE_VALUE);
printTagValue(jpegMetadata, TiffConstants.EXIF_TAG_BRIGHTNESS_VALUE);
printTagValue(jpegMetadata, TiffConstants.GPS_TAG_GPS_LATITUDE_REF);
printTagValue(jpegMetadata, TiffConstants.GPS_TAG_GPS_LATITUDE);
printTagValue(jpegMetadata, TiffConstants.GPS_TAG_GPS_LONGITUDE_REF);
printTagValue(jpegMetadata, TiffConstants.GPS_TAG_GPS_LONGITUDE);

System.out.println();

// simple interface to GPS data
TiffImageMetadata exifMetadata = jpegMetadata.getExif();
if (null != exifMetadata)
{
TiffImageMetadata.GPSInfo gpsInfo = exifMetadata.getGPS();
if (null != gpsInfo)
{
String gpsDescription = gpsInfo.toString();
double longitude = gpsInfo.getLongitudeAsDegreesEast();
double latitude = gpsInfo.getLatitudeAsDegreesNorth();

System.out.println(" " + "GPS Description: " + gpsInfo);
System.out.println(" " + "GPS Longitude (Degrees East): " + longitude);
System.out.println(" " + "GPS Latitude (Degrees North): " + latitude);
}
}

// more specific example of how to manually access GPS values
TiffField gpsLatitudeRefField = jpegMetadata
.findEXIFValue(TiffConstants.GPS_TAG_GPS_LATITUDE_ REF);
TiffField gpsLatitudeField = jpegMetadata
.findEXIFValue(TiffConstants.GPS_TAG_GPS_LATITUDE) ;
TiffField gpsLongitudeRefField = jpegMetadata
.findEXIFValue(TiffConstants.GPS_TAG_GPS_LONGITUDE _REF);
TiffField gpsLongitudeField = jpegMetadata
.findEXIFValue(TiffConstants.GPS_TAG_GPS_LONGITUDE );
if (gpsLatitudeRefField != null && gpsLatitudeField != null
&& gpsLongitudeRefField != null
&& gpsLongitudeField != null)
{
// all of these values are strings.
String gpsLatitudeRef = (String) gpsLatitudeRefField.getValue();
RationalNumber gpsLatitude[] = (RationalNumber[]) (gpsLatitudeField
.getValue());
String gpsLongitudeRef = (String) gpsLongitudeRefField
.getValue();
RationalNumber gpsLongitude[] = (RationalNumber[]) gpsLongitudeField
.getValue();

RationalNumber gpsLatitudeDegrees = gpsLatitude[0];
RationalNumber gpsLatitudeMinutes = gpsLatitude[1];
RationalNumber gpsLatitudeSeconds = gpsLatitude[2];

RationalNumber gpsLongitudeDegrees = gpsLongitude[0];
RationalNumber gpsLongitudeMinutes = gpsLongitude[1];
RationalNumber gpsLongitudeSeconds = gpsLongitude[2];

// This will format the gps info like so:
//
// gpsLatitude: 8 degrees, 40 minutes, 42.2 seconds S
// gpsLongitude: 115 degrees, 26 minutes, 21.8 seconds E

System.out.println(" " + "GPS Latitude: "
+ gpsLatitudeDegrees.toDisplayString() + " degrees, "
+ gpsLatitudeMinutes.toDisplayString() + " minutes, "
+ gpsLatitudeSeconds.toDisplayString() + " seconds "
+ gpsLatitudeRef);
System.out.println(" " + "GPS Longitude: "
+ gpsLongitudeDegrees.toDisplayString() + " degrees, "
+ gpsLongitudeMinutes.toDisplayString() + " minutes, "
+ gpsLongitudeSeconds.toDisplayString() + " seconds "
+ gpsLongitudeRef);

}

System.out.println();

ArrayList items = jpegMetadata.getItems();
for (int i = 0; i < items.size(); i++)
{
Object item = items.get(i);
System.out.println(" " + "item: " + item);
}

System.out.println();
}
}

private static void printTagValue(JpegImageMetadata jpegMetadata,
TagInfo tagInfo) throws ImageReadException, IOException
{
TiffField field = jpegMetadata.findEXIFValue(tagInfo);
if (field == null)
System.out.println(tagInfo.name + ": " + "Not Found.");
else
System.out.println(tagInfo.name + ": "
+ field.getValueDescription());
}

}