MATLAB COMPILER RELEASE NOTES Guía de usuario Pagina 687

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Programming
23-23
1
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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')'
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