Header Parameters Image headers describe the format of an image and permit arbitrary parameters to be carried with the pixel data. The image database interface is the imio interface to the database containing the image headers. The first, fixed format, part of the image header contains the standard fields in binary and is fixed in size. When an image is opened a large user area is allocated to permit the addition of new parameters without filling up the buffer. When the header is subsequently updated on disk only as much disk space is used as is needed to store the actual header.
Images comprise keyword parameters in an image header in addition to the pixel values.
These header keywords describe the fundamental properties of the image such as its size and data type. In addition, they represent other pertinent information such as the instrument, date, world coordinate transformation, or any other data thought useful by the originator of the data. Image Header Parameter Functions. The former procedures permit the parameter to be created and the value initialized all in one call, while the latter only creates the parameter. The principal limitation of the typed procedures is that they may only be used to add or set parameters of a standard data type.