yuy2 raw format a VB.net

[joker77]

Hi

I have problem with video card.
Video card send to my function image in yuy2 how displays on screen (direct3d or directdraw?), how to convers to rgb format ?

From http://www.fourcc.org/ i get formula to convers yuy2torgb and pictures is very green and violet

source code:

b = fixvalue(1.164383 * (y - 16) + 2.017232 * (u - 128))
g = fixvalue(1.164383 * (y - 16) - 0.391762 * (u - 128) - 0.812968 * (v - 128))
r = fixvalue(1.164383 * (y - 16) + 1.596027 * (v - 128))

tmp(l) = r
tmp(l + 1) = g
tmp(l + 2) = b
l += 3

Best regards
Tomek

[JohnnyMalaria]

This looks like a YUV image being decoded as if it was RGB. i.e., what ever is decoding the frame thinks it is RGB but it is really YUV.

Can you give more information?

Are you sending a frame to the video card or are you getting the frame from the video card?

Can you post the complete function for converting YUY2 to RGB?

[joker77]

Video Card send image to my function in format YUY2 or YUV 4:2:2 (all have same code 0x44)

function fixvalues fix to 0-255

My whole convert function :

public obrazkamera() as byte

Function Yuy2toRgb() As Byte()
Dim y, y1, u, v As Integer
Dim r, g, b As Byte
Dim r1, g1, b1 As Byte
Dim i, j, l As Integer
Dim tmp() As Byte
Dim YUYwidth, YUYheight As Integer
Dim dlugoscYUY As Integer
Dim punkt As Long
YUYwidth = 320
YUYheight = 240

ReDim tmp(YUYwidth * YUYheight * 3)

YUYwidth = YUYwidth - 1 'uwaga

dlugoscYUY = '(YUYwidth) * 2

l = 0

If obrazkamera Is Nothing Then
Yuy2toRgb = tmp
Exit Function
End If

For j = 0 To YUYheight - 1
For i = 0 To dlugoscYUY - 2 Step 2

punkt = j * (dlugoscYUY) + i
If i Mod 4 = 0 Then

y = CInt(obrazkamera(punkt))
u = CInt(obrazkamera(punkt + 1))
v = CInt(obrazkamera(punkt + 3))

Else

u = CInt(obrazkamera(punkt - 1))
v = CInt(obrazkamera(punkt + 1))
y = CInt(obrazkamera(punkt))
End If

r = fixvalue(1.164383 * (y - 16) + 1.596027 * (v - 128))
g = fixvalue(1.164383 * (y - 16) - 0.391762 * (u - 128) - 0.812968 * (v - 128))
b = fixvalue(1.164383 * (y - 16) + 2.017232 * (u - 128))

tmp(l) = r
tmp(l + 1) = g
tmp(l + 2) = b
l += 3

Next
Next

End Function