How to set the video feed and still capture to a single channel (monochrome)

[rajeshamudala]

Hi,

I am running two monochrome cameras using this code. We found that the bitmap data is being generated in RGB format. How can we set the bitmap data to a monochrome format?

I have created a new media subtype:
public static readonly Guid MEDIASUBTYPE_Y8 = new Guid("{17fd9d23-d15f-4e42-9e3e-310b1d4a209b}");
in the DsGuid class and assigned it as follows:

var mt = new DirectShow.AM_MEDIA_TYPE();
mt.MajorType = DirectShow.DsGuid.MEDIATYPE_Video;
//mt.SubType = DirectShow.DsGuid.MEDIASUBTYPE_RGB24;
mt.SubType = DirectShow.DsGuid.MEDIASUBTYPE_Y8;
ismp.SetMediaType(mt);

However, in the CreateSampleGrabber method, the getBitmap() function is returning null.

[secile]

Hello, thank you for your question.
and you may ask me some other issues. I'm sorry for not replying some issues.

I want to confirm your situation.

(1) You are using monochrome USB camera? not usually USB camera that support RGB colors.
Could you tell me the details of monochrome USB camera, such as product name, maker, URL.

(2) Does your monochrome USB camera is able to use this library?
Can you can get valid image via camera.GetBitmap() method? or invalid image?

[secile]

As I read your message and message in another issue,
your camera's image format may be Y8 (also called Y800).

There is a 'BufferToBitmap' function in this library.
This function requires 1 argument byte[] buffer.
BuffetToBitmap assumes that buffer image format is RGB24.
But your camera's format is Y8. This is the problem, I think.

So you may have to modify BuffetToBitmap function.
I have never used Y8 format, but as long as I searched in google, it may not so difficult.

[rajeshamudala]

Hi, thanks for the reply.

Here are the links to the cameras we are using:

1. (https://www.e-consystems.com/industrial-cameras/ov2311-monochrome-global-shutter-camera.asp)
2. (https://www.e-consystems.com/ar0521-monochrome-usb-nir-camera.asp)

When I tried changing to the YUV2 format and modified the bitmap conversion to monochrome, I was able to get the grayscale feed.

However, I am facing an issue with Still Pin Capture:

1. The captured images are being saved as corrupted.
2. The images are in RGB format instead of grayscale.

[secile]

Currently, the library is not support monochrome camera.
I would like to support monochrome USB camera if possible.

(1) let me know result of below, and which format you selected?

foreach (var item in formats) Console.WriteLine(item);

(2) are you define 'USBCAMERA_WPF'? 'USBCAMERA_BYTEARRAY'?

(3) are you use with WinForms? WPF?

(4) if possible, could you upload you modified UsbCamera.cs.