Android Question How can i apply grayscale effect to camera preview data before send to detect function

[ykucuk]

How can i add effects to data(grayscale) before send for detect function?

Sub Camera1_Preview (data() As Byte)
'i should apply grayscale effect here
Dim bb As JavaObject
bb = bb.InitializeStatic("java.nio.ByteBuffer").RunMethod("wrap", Array(data))

 

[ykucuk]

I solved with bitmapeffects lib.

 

[TILogistic]

I solved with bitmapeffects lib.

[B4X] BitmapCreator Effects

BitmapCreatorEffects class includes all kinds of very simple to use image effects. The class is cross platform and compatible with B4J (v6.3+), B4A (v8.3+) and B4i (v5.0+). Example: 'Greyscale an image: Dim GreyImage As B4XBitmap = effects.GreyScale(ExistingBmp) 'Blur an image: Dim BlurImage As...

www.b4x.com

 

[TILogistic]

tips:
See grayscale for OCR

Public Sub GreyScale (bmp As B4XBitmap) As B4XBitmap
    Dim bc As BitmapCreator = CreateBC(bmp)
    Dim argb As ARGBColor
    For x = 0 To bc.mWidth - 1
        For y = 0 To bc.mHeight - 1
            bc.GetARGB(x, y, argb)
            Dim c As Int = argb.r * 0.21 + argb.g * 0.72 + 0.07 * argb.b
            argb.r = c
            argb.g = c
            argb.b = c
            bc.SetARGB(x, y, argb)
        Next
    Next
    Return bc.Bitmap
End Sub

 

[TILogistic]

It can be helpful:

sorry Spanish:

Escaner OCR desde cámara

Buen día colegas. Alguien sabe si hay algún ejemplo para escanear una chapa patente automotor con la cámara y que coloque los caracteres en un campo para consulta a la base de datos? Muchas gracias

www.b4x.com

JavaANPR - Automatic number plate recognition system