Robotica - un Gran Desafío para una Gran Programador

Necesito poder tomar la imagen de una webcam usb sin que se muestre en pantalla ,
es decir, tomar los pixels que envia la webcam a trabés del puerto usb e ir guardándolos
en variables (matrices) para su posterior precesamiento.

La forma que conozco de tomar la imagen de la webcam es usando las api de avicap32.dll ,
pero te habre indefectiblemente una ventana en pantalla con la imagen y el problema se plantea
por que lo que no quiero es que se vea en pantalla la imagen en ningun momento.

OJO ! si intentan esconder la ventana de alguna forma NO FUNCIONA ( ya probé ), se pueden
seguir tomando los pixels pero la imagen no se actualiza (mantiene la ultima imagen
tomada antes de oculatr la ventana)

ALGUNA SUGERENCIA ???????

Bueno hay varias maneras, todo depende de la camara y del lenguaje de programacion que usas.

En todo caso, uno que puede servirte es los drivers TWAIN. Si tu camara lo soporta (dice TWAIN compliant) entonces puedes. Esta es una libreria que te permite configurar la camara y capturar la información. Puedes hacer lo que quieras con la imagen. Estoy seguro que sirven para C/C++ y para Java. No se para los demas, pero deberia.

mira lo que dices sale muy facilmente utilizando las APIs de Windows no se si sabras sobre eso pero te digo que por ahi puedes hacer lo que quieras , hay una libreria llamada vfw.h que trae funciones para video captura que es la parte que trata con las webcam , leete en la msdn lo referente en avifile a la captura y ya tienes tu problema resuelto...prueba esto y me dices que tal

Option Explicit

Public Type RGBthingy
value As Long
End Type

Public Type RGBpoint
red As Byte
Green As Byte
Blue As Byte
End Type


Public Const ws_child As Long = &H40000000
Public Const ws_visible As Long = &H10000000
Public Const SWP_NOSIZE As Long = &H1&
Public Const SWP_NOMOVE As Long = &H2&
Public Const SWP_NOZORDER As Long = &H4&
Public Const SWP_NOSENDCHANGING As Long = &H400& ' /*
Public Const HWND_BOTTOM As Long = 1&

Public Const SM_CYCAPTION As Long = 4
Public Const SM_CXBORDER As Long = 5
Public Const SM_CYBORDER As Long = 6

Public Const SM_CYMENU As Long = 15

Public Const SM_CXEDGE As Long = 45
Public Const SM_CYEDGE As Long = 46

Declare Function ShellAbout Lib "shell32" Alias "ShellAboutA" _
(ByVal hwnd As Long, _
ByVal szApp As String, _
ByVal szOtherStuff As String, _
ByVal hIcon As Long) As Long
Declare Function SetWindowTextAsLong Lib "user32" Alias "SetWindowTextA" (ByVal hwnd As Long, ByVal LPCSTR As Long) As Long ' C BOOL
Declare Function GetSystemMetrics Lib "user32" (ByVal nIndex As Long) As Long
Declare Function SetParent Lib "user32" (ByVal hWndChild As Long, ByVal hWndNewParent As Long) As Long
Declare Function SetWindowPos Lib "user32" (ByVal hwnd As Long, ByVal hWndInsertAfter As Long, ByVal x As Long, ByVal y As Long, ByVal cx As Long, ByVal cy As Long, ByVal wFlags As Long) As Long
Declare Function DestroyWindow Lib "user32" (ByVal hwnd As Long) As Long
Declare Function GetDiskFreeSpace Lib "kernel32" Alias "GetDiskFreeSpaceA" _
(ByVal lpRootPathName As String, _
lpSectorsPerCluster As Long, _
lpBytesPerSector As Long, _
lpNumberOfFreeClusters As Long, _
lpTtoalNumberOfClusters As Long) As Long

'Cabezeras Globales
Declare Function GlobalAlloc Lib "kernel32" (ByVal wFlags As Long, ByVal dwBytes As Long) As Long
Declare Function GlobalFree Lib "kernel32" (ByVal hmem As Long) As Long
Declare Function GlobalLock Lib "kernel32" (ByVal hmem As Long) As Long
Declare Function GlobalUnlock Lib "kernel32" (ByVal hmem As Long) As Long

Public Declare Sub CopyMemory Lib "kernel32" Alias "RtlMoveMemory" (lpvDest As Any, lpvSource As Any, ByVal cbCopy As Long)

Declare Function lstrcpy Lib "kernel32" Alias "lstrcpyA" (ByVal lpStringDest As Long, ByVal lpStringSrc As Long) As Long
Declare Sub CopyPTRtoANY Lib "kernel32.dll" Alias "RtlMoveMemory" (ByRef Dest As Any, ByVal PtrSrc As Long, ByVal length As Long)
Declare Sub CopyPTRtoLONG Lib "kernel32.dll" Alias "RtlMoveMemory" (ByRef LONGDest As Long, ByVal PtrSrc As Long, ByVal length As Long)

Declare Function BitBlt Lib "gdi32" (ByVal hDestDC As Long, ByVal x As Long, ByVal y As Long, ByVal nWidth As Long, ByVal nHeight As Long, ByVal hSrcDC As Long, ByVal xSrc As Long, ByVal ySrc As Long, ByVal dwRop As Long) As Long
Declare Function CreateBitmap Lib "gdi32" (ByVal nWidth As Long, ByVal nHeight As Long, ByVal Nplanes As Long, ByVal nBitCount As Long, lpBits As Any) As Long
Public Declare Function SetBkColor Lib "gdi32" (ByVal hdc As Long, ByVal crColor As Long) As Long
Public Declare Function SelectObject Lib "gdi32" (ByVal hdc As Long, ByVal hObject As Long) As Long
Public Declare Function CreateCompatibleBitmap Lib "gdi32" (ByVal hdc As Long, ByVal nWidth As Long, ByVal nHeight As Long) As Long
Public Declare Function CreateCompatibleDC Lib "gdi32" (ByVal hdc As Long) As Long
Public Declare Function DeleteDC Lib "gdi32" (ByVal hdc As Long) As Long
Public Declare Function DeleteObject Lib "gdi32" (ByVal hObject As Long) As Long

Public Const GMEM_MOVEABLE = &H2&
Public Const GMEM_SHARE = &H2000&
Public Const GMEM_ZEROINIT = &H40&

'Hacerca del videio
Global Const WM_USER = 1024
Global Const WM_CAP_EDIT_COPY = WM_USER + 30
Global Const wm_cap_driver_connect = WM_USER + 10
Global Const wm_cap_set_preview = WM_USER + 50
Global Const wm_cap_set_overlay = WM_USER + 51
Global Const WM_CAP_SET_PREVIEWRATE = WM_USER + 52
Global Const WM_CAP_SEQUENCE = WM_USER + 62
Global Const WM_CAP_SINGLE_FRAME_OPEN = WM_USER + 70
Global Const WM_CAP_SINGLE_FRAME_CLOSE = WM_USER + 71
Global Const WM_CAP_SINGLE_FRAME = WM_USER + 72

Public Const WM_CAP_DLG_VIDEOFORMAT As Long = WM_USER + 41

Global Const DRV_USER = &H4000
Global Const DVM_DIALOG = DRV_USER + 100
Global Const WM_CAP_DRIVER_DISCONNECT As Long = WM_USER + 11
Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lParam As Long) As Long
Declare Function capCreateCaptureWindow Lib "avicap32.dll" Alias "capCreateCaptureWindowA" (ByVal a As String, ByVal b As Long, ByVal c As Integer, ByVal d As Integer, ByVal e As Integer, ByVal f As Integer, ByVal g As Long, ByVal h As Integer) As Long
Declare Function SendMessageAsLong Lib "user32" Alias "SendMessageA" _
(ByVal hwnd As Long, _
ByVal wMsg As Long, _
ByVal wParam As Long, _
ByVal lParam As Long) As Long
Global Const WM_CAP_GRAB_FRAME As Long = WM_USER + 60

Si quieres el ejemplo completo solo eviame un mail y ya te lo estare enviando sin ventanas y actualizandose cada microsegundo buenoeso creo pero en fin a mi me funciona y ademas selecciono color y saco contornos muy bueno para robotica

Hola, necesito el codigo completo para capturar jpg o bmp de una webcam y si es posible editarle un texto a la imágen antes de guardarla.
Gracias
Adriana