Read image data from COM7 port in Java

Question

I am doing a project in which I have to display the image captured from a camera chip on to the PC.

The image data is being sent through the COM7 port to the computer. (I have checked it using a dumb terminal program). Basically what I want to do is to develop a Java program that will read the COM port, get the image data, process it and display it on the screen.

What I want to know is how to read this image data from COM7 port in my Java program.

Not nearly enough information to answer. In what format is the data being streamed? — Michael Petrotta, Apr 12 '12 at 03:55
That is meaningless. In what *file or image format* is the data being streamed? — Michael Petrotta, Apr 12 '12 at 05:13
I am getting data from a micro-controller through the RS232 link. — stud91, Apr 12 '12 at 07:46

score 1 · Answer 1 · answered Apr 12 '12 at 20:19

For the serial port portion of the problem, read the serial port like any other file.

On 'nix, serial ports are named /dev/ttySn where n 0-3 for COM1 to COM4. I'm guessing that if more serial ports exist, appropriately named files will exist on your system to access these too.
on Windows you can just use the special file names COM1, COM2, etc.

As for actually reading the image data, as mentioned by others, you will need to know what format it is in. You can try using ImageIO.read() if it is in one of Java's known file formats. If it is in a raw bitmap format, you could try constructing a buffered image from the raw data by creating a BufferedImage from a Raster, and a Raster from an appropriate SampleModel and DataBuffer. You will need to know the format of the bitmap data to do this, however.

The data format according to camera specification is: Data format - YCrCb 4:2:2, GRB 4:2:2, RGB Raw Data — stud91, Apr 14 '12 at 07:14

score 0 · Answer 2 · edited May 23 '17 at 12:11

0

You probably want to start with reading the data from the port. For this, a Socket could be useful.

Since you 'think' the data will be bytes... try the following:

BufferedImage img = ImageIO.read(new ByteArrayInputStream(bytes));

You could also check out a related post

edited May 23 '17 at 12:11

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answered Apr 12 '12 at 20:07

radimpe

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Read image data from COM7 port in Java

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