QDataStream an openCV::mat serialisation...

[Dariusz]

Hey

I'm running these commands to save/load my data & its my first time using read/write raw data so I'm fairly sure I broke it...

Any idea what did I mess up with this ?

Write

        int dataSize = mImage->total() * mImage->elemSize1();
        int type = mImage->type();
        int step = mImage->step;
        int width = mImage->cols;
        int height = mImage->rows;
        stream << type << step << width << height << dataSize;
        qDebug() << "Storing image : " << type << step << width << height << dataSize;
        stream.writeRawData(reinterpret_cast<const char *>(mImage->data), dataSize);

Read:

        int dataSize;
        int type;
        int step;
        int width;
        int height;
        stream >> type >> step >> width >> height >> dataSize;
        char *data = new char[dataSize];
        qDebug() << "Restoring image : " << type << step << width << height << dataSize;
        //stream.device()->reset();
        stream.readRawData(data, dataSize);
        mImage = new cv::Mat(height, width, type, data, step);

I think I'm writing/reading data incorrectly.. not sure... any hints?

[Dariusz]

@jsulm said in QDataStream an openCV::mat serialisation...:

@Dariusz What is stream here? Is it QDataStream?
"Any idea what did I mess up with this ?" - well, what is not working?

Yep :- )

I think I might "got it". Naturally 5 min after asking question... elemSize1() return incorrect number of channels. Looks like I need elemSize() instead. still testing.

Yep it was wrong element number.

Hope it helps other "serializers" out here : -)

[jsulm]

@Dariusz What is stream here? Is it QDataStream?
"Any idea what did I mess up with this ?" - well, what is not working?

[Dariusz]

@jsulm said in QDataStream an openCV::mat serialisation...:

@Dariusz What is stream here? Is it QDataStream?
"Any idea what did I mess up with this ?" - well, what is not working?

Yep :- )

I think I might "got it". Naturally 5 min after asking question... elemSize1() return incorrect number of channels. Looks like I need elemSize() instead. still testing.

Yep it was wrong element number.

Hope it helps other "serializers" out here : -)