Mercurial > octave-antonio
comparison scripts/image/imread.m @ 17118:c97a26408ee0
Implement PixelRegion option for imread().
* imread.m: document new option.
* private/__imread__.m: parse new option and set defaults.
* __magick_read__.cc (calculate region): new option to calculate the region
to be read, shifts in memory required, and output image size.
(read_indexed_images, read_images): implement reading of only specific
regions of an image.
(__magick_read__): get octave_scalar_map at start for simplicity.
| author | Carnë Draug <carandraug@octave.org> |
|---|---|
| date | Wed, 31 Jul 2013 21:28:48 +0100 |
| parents | 3db796f89695 |
| children | d6499c14021c |
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| 17117:47b504503a3f | 17118:c97a26408ee0 |
|---|---|
| 63 ## | 63 ## |
| 64 ## @item "Info" | 64 ## @item "Info" |
| 65 ## This option exists for @sc{Matlab} compatibility and has no effect. For | 65 ## This option exists for @sc{Matlab} compatibility and has no effect. For |
| 66 ## maximum performance while reading multiple images from a single file, | 66 ## maximum performance while reading multiple images from a single file, |
| 67 ## use the Index option. | 67 ## use the Index option. |
| 68 ## | |
| 69 ## @item "PixelRegion" | |
| 70 ## Controls the image region that is read. Takes as value a cell array | |
| 71 ## with two arrays of 3 elements @code{@{@var{rows} @var{cols}@}}. The | |
| 72 ## elements in the array are the start, increment and end pixel to be | |
| 73 ## read. If the increment value is ommited, defaults to 1. | |
| 68 ## @end table | 74 ## @end table |
| 69 ## | 75 ## |
| 70 ## @seealso{imwrite, imfinfo, imformats} | 76 ## @seealso{imwrite, imfinfo, imformats} |
| 71 ## @end deftypefn | 77 ## @end deftypefn |
| 72 | 78 |