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ImageReader
for binary and ASCII files.
See:
Description
Class Summary | |
IIOListeners | A container of image I/O listeners. |
IIOReadProgressAdapter | An abstract adapter class for receiving image progress events. |
PaletteFactory | A factory class for IndexColorModel objects.
|
RawBinaryImageReader | Deprecated. Use Sun's RAW decoder provided with "Java Advanced Imaging Image I/O Tools" instead. |
RawBinaryImageReader.Spi | Service provider interface (SPI) for RawBinaryImageReader s.
|
RawBinaryImageReadParam | Deprecated. Use Sun's RAW decoder provided with "Java Advanced Imaging Image I/O Tools" instead. |
SimpleImageReader | Base class for simple image decoders. |
TextImageReader | Base class for text image decoders. |
TextImageReader.Spi | Service provider interface (SPI) for TextImageReader s. |
TextMatrixImageReader | An image decoder for matrix of floating-point numbers. |
TextMatrixImageReader.Spi | Service provider interface (SPI) for TextMatrixImageReader s.
|
TextRecordImageReader | Image decoder for text files storing pixel values as records. |
TextRecordImageReader.Spi | Service provider interface (SPI) for TextRecordImageReader s.
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Extensions to ImageReader
for binary and ASCII files.
Image I/O extensions are provided as part of
Grid Coverage implementation.
The gt2-coverage.jar
file declares a service provider for the
following image readers:
ImageReader subclass |
Name | MIME type |
---|---|---|
RawBinaryImageReader |
raw | image/raw |
TextMatrixImageReader |
matrix | text/matrix |
TextRecordImageReader |
gridded records | text/x-grid |
SimpleImageReader
is
the base class for image decoders reading stream with few (if any)
meta-data. Examples of such streams are matrix containing the pixels
values in a binary form (RAW images), or ASCII files containing values
written as decimal numbers. Such kinds of stream are not uncommon in the
remote sensing field. They often contain geophysical values (e.g.
temperature in Celsius degrees, elevation in metres, etc.) better
represented as floating point numbers than integers. For example,
a user may want to read an ASCII file containing gridded elevation
on the ocean floor (left side below). TextRecordImageReader
can read such file, detect automatically minimum and maximum values (in order
to scale the grayscale palette) and produce the image below:
Longitude Latitude Altitude 59.9000 -30.0000 -3022 59.9333 -30.0000 -3194 59.9667 -30.0000 -3888 60.0000 -30.0000 -3888 45.0000 -29.9667 -2502 45.0333 -29.9667 -2502 45.0667 -29.9667 -2576 45.1000 -29.9667 -2576 45.1333 -29.9667 -2624 45.1667 -29.9667 -2690 45.2000 -29.9667 -2690 45.2333 -29.9667 -2692 45.2667 -29.9667 -2606 45.3000 -29.9667 -2606 45.3333 -29.9667 -2528etc... |
By default, SimpleImageReader
store decoded image using data type DataBuffer.TYPE_FLOAT
and a grayscale color space. This politic produce image matching closely the
original data, i.e. it involves as few transformations as possible. But
displaying floating-point image is usually very slow. User are strongly
encourages to use Java
Advanced Imaging's operations after reading in order to scale data as
they see fit. The example below reformat the DataBuffer.TYPE_FLOAT
data into DataBuffer.TYPE_BYTE
and change the grayscale
colors to an indexed color model.
import |
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