MATLAB: Can I read Erdas Imagine file formats in MATLAB

*.imgerdasimagineMATLABmultibandread

I would like to read in an ERDAS Imagine (.IMG) file directly. I have been unable to find any examples on how this could be done using MATLAB.

Best Answer

The ability to read Erdas Imagine files is not available in MATLAB. The MULTIBANDREAD function reads raw, uncompressed binary data stored in one of three simple configurations. It does not support the Erdas Imagine (.IMG) format.

As a workaround, convert the file from Erdas Imagine .IMG format into a format that IMREAD accepts. This conversion will need to be performed in another application. A list of these formats is available in the documentation for IMREAD which is available by typing "doc imread" at the MATLAB command prompt.

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MATLAB: Does MATLAB or the Image Processing Toolbox have a function that reads Landsat image files

Landsat imagery is available in multiple data formats, most of which may be read with MATLAB or MATLAB toolboxes. You must first determine which format your data is in. Here are the most likely possibilities:

1. GeoTIFF -- Use GEOTIFFREAD function in the Mapping Toolbox or IMREAD in MATLAB. Note that GeoTIFF files have an image component and a geospatial component. IMREAD function in MATLAB can read only the image component. GEOTIFFREAD extracts georeferencing and geospatial coordinate system information, in addition to the imagery itself. Note that GEOTIFFREAD can not read a four layer GeoTIFF dataset.

2. HDF (Hierarchical Data Format) -- Use HDFREAD or HDFTOOL function in MATLAB.

3. LAN (older Erdas format) -- This format is no longer widely used. Either (1) construct your own code to read the simple, fixed-length header then call MULTIBANDREAD in MATLAB to extract the pixel values or (2) copy and use the subfunction LAN_READ from LANDSATDEMO in the Image Processing Toolbox. See the Image Processing Toolbox demo "Enhancing Multispectral Color Composite Images" (ipexlanstretch.m) for an example in which MULIBANDREAD is applied to a .LAN image.

4. IMG (Erdas Imagine native format) -- There is currently no support for this format in MATLAB. (If your data provider is using Imagine, request that they export in GeoTIFF instead.)

MATLAB: Imagine processing, elimination of oscillations

You can use imdilate() which gives the max value inside a sliding window. Or just scan the data replacing with the max if it ever falls below the prior value.

out = inputSignal % Make copy.
for k = 2 : length(out)
  if out(k) < out(k-1)
    out(k) = out(k-1);
  end
end

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MATLAB: Imagine processing, elimination of oscillations

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