B4J Question BMP Image To Byte Array

N

nazilabdulla

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How to read / write bytes from/to B4XBitmap ?
Image can be processed by this method ?
Is it best solution for image recognition ? Any other better way ?
 
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xulihang

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ImageToBytes: 
Public Sub ImageToBytes(Image As B4XBitmap) As Byte()
    Dim out As OutputStream
    out.InitializeToBytesArray(0)
    Image.WriteToStream(out, 100, "JPEG")
    out.Close
    Return out.ToBytesArray
End Sub


BytesToImage: 
Public Sub BytesToImage(bytes() As Byte) As Image
    Dim In As InputStream
    In.InitializeFromBytesArray(bytes, 0, bytes.Length)
    Dim bmp As Image
    bmp.Initialize2(In)
    In.Close
    Return bmp
End Sub
 
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M

Mahares

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@xulihang: Why are you taking credit for these tools when they were made by Erel in this link in 2018. How are they different. Maybe you mean 'Used them with B4J'?

[B4X] Bytes To File

This code is no longer needed. Use File.WriteBytes / ReadBytes. Write an array of bytes to a file and read a file into an array of bytes. Sub BytesToFile (Dir As String, FileName As String, Data() As Byte) Dim out As OutputStream = File.OpenOutput(Dir, FileName, False)...
www.b4x.com
 
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Daestrum

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@Mahares I think you are reading their footer, the tools they made are below.
 
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TILogistic

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Is it best solution for image recognition ? Any other better way ?
Click to expand...
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find Area in Image

Hello, im searching for a solution to find a given Area in an Image. I want to make screenshots and simulate Mousclicks on specific areas when something is found. the Area bitmap is fix in my assets, and i need the coordinates where this little Area image is shown in the screenshot. this area...
www.b4x.com
 
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