Hi He,
You can build up this sort of selection with the H5Sselect_hyperslab()
routine by using the H5S_SELECT_OR operator (or another convenient operator).
Quincey
On Nov 13, 2012, at 1:06 PM, [email protected] wrote:
> Hi
> The problem is the hyperslab's strid is meaused by the number of pixels,
> not bytes, so I i have a 8 16bit pixels, and a 4 padding bits,
> the stride will not work. as if the stride is 1 it will be 16bit not 4bits.
>
> He Yang
>
>
>
> On Tue, Nov 13, 2012 at 12:24 PM, Quincey Koziol <[email protected]> wrote:
>
> On Nov 12, 2012, at 8:52 AM, [email protected] wrote:
>
> > Hi All
> > I am trying to save image data to the dataset, the image data is
> > allocated by other library, so the image's scanline length is not equal to
> > the number
> > of pixels, and will have the padding bytes. I want save it into hdf5 as a
> > matrix, which don't have those padding bytes, as the image can be float,
> > unsigned short, and come from other data, the scanline length(/ step )
> > between each row may not be the multiples of the pixels. for example, the
> > image has 9 unsigned short pixels, and the sacn line length is defined by
> > allocate 9*(16/2)+4=76 bytes, the stride in hdf5 can only be the interger
> > times the elements length. so it can not work. And I don't want use a
> > temporary buffer to change the memory layout. I also want all other hdf5
> > application can directly read the image out as matrix, so I don't want use
> > raw data format. Is there a way which can directly use hdf5's api and it
> > will automatically strip the padding bytes for image data.
>
> You should be able to use hyperslab or point selections to achieve
> what you want.
>
> Quincey
>
>
>
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