How to convert bytes arrays type of double to image?

I am currently working on online SfM and I need to send stream of Images from Android phone to Matlab. I've managed to send bytes of data to Matlab from Android through TCP/IP Socket programming but I am unable to convert it to image. I expect that the image would be saved in the directory or if it's possible to be directly consumed by the SfM pipeline as described on this link: Structure From Motion From Two Views . I tried to decode it with java as described here: how to convert a cell array into an image?, but it didn't work as well. I got an error "Struct contents reference from a non-struct array object." on "height = jimage.getHeight;". Do you know how to fix this problem? Or do you know how to do this correctly in Matlab?

This is the code:

t = tcpip('0.0.0.0', 8889, 'NetworkRole', 'Server');
set(t,'InputBufferSize', 3000000);
set(t,'Timeout', 30);
disp('Waiting Connection...');
fopen(t);

while(1) 
 if (t.BytesAvailable > 0)
  disp('Connection succeed.');
  rawData = fread(t,t.BytesAvailable);
  whos rawData; 
  jimage = javax.imageio.ImageIO.read(java.io.ByteArrayInputStream(rawData));
  height = jimage.getHeight;
  width = jimage.getWidth;
  pixels = reshape(typecast(jimage.getData.getDataStorage, 'uint8'), [3,width,height]);
  img = cat(3, ...
  transpose(reshape(pixels(3,:,:), [width,height])), ...
  transpose(reshape(pixels(2,:,:), [width,height])), ...
  transpose(reshape(pixels(1,:,:), [width,height])));
  imshow(img);
end
end
fclose(t);

This is the sample of data that I get from "whos rawData":

Size: 390964x1           
Bytes: 3127712  
Class: double

Answer 1

[Walter Roberson]

Try

rawData = fread(t,t.BytesAvailable, '*uint8');

[Muhamad Risqi Utama Saputra]

I've tried it and got this error message:

Error using icinterface/fread (line 203) Invalid PRECISION specified. Type 'instrhelp fread' for more information.

I tried to remove * and the error message back to:

Struct contents reference from a non-struct array object

And jimage is empty.

[Walter Roberson]

https://www.mathworks.com/matlabcentral/newsreader/view_thread/253270 suggests that to be getting the image size, you should be working with a Java BufferedImage . You are not: you are attempting a direct image read, and then expecting that the array of doubles that results can have methods applied to it.

[Muhamad Risqi Utama Saputra]

Do you know how to get/convert to Java BufferedImage from raw data?

[Walter Roberson]

If you mean from image data, then https://www.mathworks.com/matlabcentral/answers/100155-how-can-i-convert-a-java-image-object-into-a-matlab-image-matrix suggests im2java

If you mean that you have a data stream, then exactly what is in the data stream? For example is it a just the result of reading a .jpg as a stream of bytes and sending it over the serial port?