Comments (15)
and how do i know the fps of the library that captures?
you can get VideoFormat
by UsbCamera.GetVideoFormat(cameraIndex)
You can calculate it yourself based on VideoFormat.TimePerFrame
from usbcamera.
And maybe add like an event when a camera new frame is captured? and wait for the event to end before sending the next one
from usbcamera.
Thank you for your request.
I can't decide right now whether I will comply with your request.
For the time being, using GetPixel/SetPixel is very slow. So you had better use LockBits instead of that.
See example below. Is this can be solution of your problem?
private byte[] ExtractBitmapData(Bitmap bmp)
{
var rect = new Rectangle(Point.Empty, bmp.Size);
var data = bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
var bytes = Math.Abs(data.Stride) * bmp.Height;
var result = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(data.Scan0, result, 0, result.Length);
return result;
}
Be careful, the order of color is BGR. (not RGB).
from usbcamera.
As to an event when a new frame is captured.
Are you using WinForms, or WPF?
If WinForms, You can subscribe PreviewCaptured callback.
(If WPF, PreviewCaptured can be used only for show preview with DataBinding.)
(The difference between WinForms and WPF is, WinForms pass new Bitmap every call, WPF pass single bitmap instance.)
Is this can be solution of your problem?
camera.PreviewCaptured += (bmp) =>
{
// called here when every preview captured.
};
from usbcamera.
Perhaps you want to directly obtain this Buffer
to reduce unnecessary bitmap conversions?
from usbcamera.
Hello, @yangjieshao.
Maybe, you are right.
But, I'm not sure if this feature is necessary for many other users.
And I think it's difficult to switch between Func GetBitmap and Func<byte[]> GetBitmap to implement this functionality.
@Mrgaton
For now, I make your custum version of UseCamera.cs. Could you try this?
GetBitmap() returns byte[] (not Bitmap.)
UsbCameraForIssue#29.zip
from usbcamera.
Or maybe add a function to get buffer instead of get bitmap
from usbcamera.
I recently sent your custom version of UsbCamera.cs last day.
Is it satisfied your requirement?
from usbcamera.
Can you add like a link like a credit on the start of the class with the link to you github repository
from usbcamera.
I recently sent your custom version of UsbCamera.cs last day. Is it satisfied your requirement?
yes but as i said i think it would be good to have two functions one to get bitmap and another to get it as byte array
from usbcamera.
like
Camera.GetBitmapRaw()
and
Camera.GetBitmap()
cause i need both
from usbcamera.
and how do i know the fps of the library that captures?
from usbcamera.
Can you add like a link like a credit on the start of the class with the link to you github repository
Thank you, I will do.
Camera.GetBitmapRaw()
Camera.GetBitmap()
cause i need both
This library has several ways to get image data.
- GetBitmap()
- PreviewCaptured
- StillImageCaptured
I wouldn't add a function to get a buffer just to GetBitmap() only.
To do this, I will add new conditional compilation symbol to switch type of image data.
Converting byte array to Bitmap is easy.
private static Bitmap BufferToBitmap(byte[] buffer, int width, int height)
{
var result = new Bitmap(width, height);
var bmpData = result.LockBits(new Rectangle(Point.Empty, result.Size), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
System.Runtime.InteropServices.Marshal.Copy(buffer, 0, bmpData.Scan0, buffer.Length);
result.UnlockBits(bmpData);
return result;
}
from usbcamera.
I modified UsbCameraForIssue#29. Could you test it?
UsbCameraForIssue#29_Rev2.zip
- fix problem that byte array image data is upside down.
- add new conditional compilation symbol 'USBCAMERA_BYTEARRAY' to change image type from Bitmap to byte array.
When you define conditional compilation symbol 'USBCAMERA_BYTEARRAY',
GetBitmap returns byte array instead of Bitmap. (and PreviewCaptured, StillImageCaptured passes data of byte array.)
To be precise, GetBitmap returns IEnumerable<byte>.
The data type is actually a byte array, so cast it to byte array before use it.
button1.Click += (s, ev) =>
{
var buf = (byte[])camera.GetBitmap();
var bmp = BufferToBitmap(buf, camera.Size.Width, camera.Size.Height);
pictureBox2.Image = bmp;
};
private static Bitmap BufferToBitmap(byte[] buffer, int width, int height)
{
var result = new Bitmap(width, height);
var bmpData = result.LockBits(new Rectangle(Point.Empty, result.Size), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
System.Runtime.InteropServices.Marshal.Copy(buffer, 0, bmpData.Scan0, buffer.Length);
result.UnlockBits(bmpData);
return result;
}
If you have any questions, please ask.
from usbcamera.
And why not the clas uses always the byte array but the función getbitmap gets the byte array and transforma It to a bitmap like
public Bitmap GetBitmap()
{
if (Buffer == null) return BitmapBuilder.EmptyBitmap;
lock (BufferLock)
{
return BmpBuilder.BufferToBitmap(Buffer);
}
}
public byte[] GetBitmap()
{
return buffet;
}
And i think It would be perfect living both together
from usbcamera.
Related Issues (20)
- WPF 每次 BufferToBitmap 的时候都创建新的 WriteableBitmap 岂不是完全没发挥 WriteableBitmap 的性能 HOT 11
- Release taking long time sometimes HOT 1
- How can I get the datas of every frame? HOT 9
- missing events HOT 4
- How can I switch camera? HOT 2
- provide nuget package HOT 4
- Implement IDisposable / IObservable pattern HOT 1
- 需要增加对于部分非标的虚拟摄像头的过滤(It is necessary to increase the filtering of some non-standard virtual cameras) HOT 7
- Problem with showing preview HOT 4
- Memory issues HOT 13
- How to distinguish the camera with the same name? HOT 4
- threads in thread pool may be blocked by this library HOT 4
- Inconsistent Image Quality When Saving Still Capture Monochrome Sensor Data as BMP HOT 8
- Can't able to set brightness and exposure at run time when camera running on different thread HOT 2
- Capture Pin not working on all cameras HOT 3
- happens ArgumentException when I dispose PictureBox's old image. HOT 1
- How can I turn off the usbcamera lights? HOT 9
- why not working in 4K? HOT 6
- Add an IsReady method to see if we can get the image? HOT 3
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from usbcamera.