Re: [Openimaj-discuss] Serializing ByteDSIFTKeypoints

[chalitha u. P. <cha...@gm...>]

Thanks for quick response Sir. It works fine for serialization. But how can
i again retrieve the list of local features by deserializing the byte array
?

I tried following code, but it gives corrupted stream exception:
java.io.StreamCorruptedException: invalid stream header: 4B505400

 ByteArrayInputStream bais = new ByteArrayInputStream(decodedBytes);

 ObjectInputStream ois = new ObjectInputStream(bais);

 LocalFeatureList<ByteDSIFTKeypoint> decodedFeatures =
(LocalFeatureList<ByteDSIFTKeypoint>)
ois.readObject();

Looking at OpenIMAJ api, there is a method to deserialze binaries, but how
to use it to get LocalFeatureList<ByteDSIFTKeypoint> from the binary ?


Thanks,

Chalitha

On Tue, Jun 16, 2015 at 5:59 PM, Jonathon Hare <js...@ec...> wrote:

> Do something like this (will automatically write the complete list of
> features without need to iterate through them):
>
> ByteArrayOutputStream baos = new ByteArrayOutputStream();
>
> org.openimaj.io.IOUtils.writeBinary(baos, features);
>
> byte[] bytes = baos.toByteArray();
>
>
>
>
> On 16 Jun 2015, at 11:19, chalitha udara Perera <cha...@gm...>
> wrote:
>
> Hi All,
> I have extracted LocalFeaturesList<ByteDSIFTKeypoint> using Pyramid Dense
> Sift in OpenIMAJ.
> As indicated in API documentation, ByteDSIFTKeypoint implements Java
> Serializable interface and there fore I would like to serialize keypoints
> for latter use.
> I tried to serialize keypoints to get a byte array. But when retrieving
> key-points from the serialized object it loses all field values associated
> with it.
>
> I am using the following code for serialization
>
> ByteArrayOutputStream baos = new ByteArrayOutputStream();
>
>  ObjectOutputStream oos = new ObjectOutputStream(baos);
>
> LocalFeatureList<ByteDSIFTKeypoint> features = psift.getByteKeypoints();
>
> for (ByteDSIFTKeypoint byteDSIFTKeypoint : features) {
>
>  oos.writeObject(byteDSIFTKeypoint);
>
> byte[] bytes = baos.toByteArray();
>
> }
>
>
> Any help regarding how to correctly serialize keypoints is greatly
> appreciated.
>
> Thanks,
>
> Chalitha
>
> --
> J.M Chalitha Udara Perera
>
> *Department of Computer Science and Engineering,*
> *University of Moratuwa,*
> *Sri Lanka*
>
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>
>


-- 
J.M Chalitha Udara Perera

*Department of Computer Science and Engineering,*
*University of Moratuwa,*
*Sri Lanka*