How to Get a Single Frame/Image From a *.wav File?

1. Use a wav editor program such as Sonic Foundry SoundForge to open the wav file as a graph.
2. Enlarge and zoom in on the section of the *.wav file that you want.
3. Press the "print screen" button on your keyboard.
4. Open MSPaint.
5. Paste captured image on MSPaint.
6. Edit image as you would with any other image file.

I don't think it is possible to do what you are asking. The .wav file format is intended primarily for audio waveforms, but can also be used for higher frequencies, and so for oscilloscope traces. However, it is not intended for image frames. You can use a .wav file as an audio input source for a video file format such as .avi, but the standeard .wav file itself is not the video source and you cannot grab frames from it. I suspect that your camera actually produces .avi; any video editing program should be able to extract a frame from that.

Thanks above two guys.

In machine vision normally a video has a format like 30frames/second, with resolution 640 x 480 or something. Does someone have coding experience in this topic?

Thank you.

If you can play the .wav file using Windows Media Player (like for playing a .wmv file) you could try pausing the video at the point you want to save, then hit the 'Control' + 'Print Screen' buttons together. This copies the entire screen image to the clip board. Then you can open Windows Paint and hit the Copy button in the Edit menu. This places the copy of the entire screen image into Windows Paint. From there you can use the editing tools on the image to get what you want. The default save option for Paint is a .bmp bitmap file.

Am I the one missing something here? I thought .wav files were audio - EXCLUSIVELY; how can you extract an "image" frame from an audio file? Perhaps there are .wav files with integrated video that I have not heard of?

Tom D.

No, you're not!. It seems very odd (or stupid) that, if it IS a proprietary video file, the machine vision manufacturers would choose the ubiquitous .wav as the extension.

Mike H.

Hi,tdesmit,

In my practice I used a *.avi file as :

frame rate: 20 f/s;

Width=640;

height=480;

data size=8 bit;

uncompressed.

If someone need a sample file and want to write code in this topic, just send me a mail to me.

OK, grabbing an image frame from an AVI file I can understand, grabbing an image frame from a WAV had me scratching my head :)

Tom

Oh, maybe I had made a misunderstand.

I just want to get an image from a *wav or *.avi file.

Thank you,Usbport

Using PrintScreen from Windows will cause the image distortion. That images are not good for image processing in machine vision which requires us to get real dimension from pixels.

Get VLC Media Player (free). Open your .avi or whatever file with it and when you get to the frame you want click Video>Snapshot. It will save the frame in whatever format you like.

Unlike PrntScrn there is no video distortion or cropping needed.

Thank you, Stevem.

I have tried VLC Media Player. It is great.

Can someone show me how to coding in this topic, in VB2005, or C#2005 or something else?

If I understand you correctly you are looking to do this job of extracting a single frame from a video through software. If the video is a .avi file you can use OpenCV to do this job. You will need to install OpenCV - but once you do that it is quite straightforward. Of course, as you are probably aware, not all .avi files are alike and you will probably need to convert some of them before they can be 'read' by OpenCV.

Another option for a free video/image editor is Utexas Image Tool: http://ddsdx.uthscsa.edu/dig/itdesc.html It's surprisingly versatile, and pretty well documented.

Thanks above 2.

It is good idea to use OpenCV, and I will try it.

ImageTool is great software which provide the basic image processing function.

Great discussion.