User`s guide

Programming

23-23

Support for Reading EXIF Data from Image Files

You can now read EXIF (Exchangeable Image File Format) data from JPEG and TIFF

graphics files using the new exifread function. EXIF is a standard used by digital camera

manufacturers to store information in the image file, such as the make and model of

a camera, the time the picture was taken and digitized, the resolution of the image,

exposure time, and focal length.

Performance Improvements to the MATLAB JIT/Accelerator on Macintosh

The JIT/Accelerator for MATLAB, introduced in MATLAB Version 6.5 for Windows

and UNIX, is now also supported on Macintosh systems. The JIT/Accelerator affects

the performance of MATLAB and can give you a substantial performance increase over

earlier MATLAB versions for many MATLAB applications.

Specifying fread Precision as Number of Bits

The following information on the fread function applies to MATLAB 7.1 and also to

earlier versions.

MATLAB provides the following method of specifying a precision argument in a call to

fread:

input_format=>output_format

For example, to read 50 8-bit unsigned integers from a file and convert them to

characters, you can use

c = fread(fid, 50, 'uint8=>char')'

If the input format and output format are the same, you can abbreviate the precision

specifier by using

*input_format

For example, you can replace

c = fread(fid, 50, 'uint8=>uint8')'