如何在Scala中替换缓冲图像中的最低有效位

Question

我试图在Scala中的缓冲图像像素中替换每个红色，绿色和蓝色值中的两个最低有效位。但是，当我尝试更改最低有效位时，更改不成立。在更改两个最重要的位时，我已经完成了这项工作，但是使用最不重要的位将无法工作。这是完成大部分繁重工作的方法

  def hideDataInImage(dataToHide: String, imageToHideIn: BufferedImage): Option[BufferedImage] = {
      // Check that the binary data is short enough to encode in the image. Assumeing that we can hide
      // one 6-bit element in one pixel the size of the array must be less than the area of the array
      if(dataToHide.length > (imageToHideIn.getHeight() * imageToHideIn.getWidth())) {
          return None
      }

     val imageToHideInCopy = deepCopyBufferedImage(imageToHideIn)

     // Turn the string of data into a string of binary numbers
     val binaryToHide = stringToBinaryArray(dataToHide)

     // Loop through the binary data and hide it in each pixel
     for(i <- binaryToHide.indices) {
         // Get the x and y data for the pixel
         val y = i / imageToHideInCopy.getWidth()
         val x = i % imageToHideInCopy.getHeight()

         val newColor = hideDataInColor(imageToHideInCopy.getRGB(x, y), binaryToHide(i))
         imageToHideInCopy.setRGB(x, y, newColor.getRGB)
      }

     // Return some image to hide in if success
     Some(imageToHideInCopy)

}

其余的代码可以在我的Github上看到。

编辑：这是我的其余代码

def hideDataInColor(pixelValue: Int, binaryDataToHide: String): Color = {
    // Get the red green blue and alpha values from the pixel value
    //           3        2        1        0
    // bitpos    10987654 32109876 54321098 76543210
    // ------   +--------+--------+--------+--------+
    // bits     |AAAAAAAA|RRRRRRRR|GGGGGGGG|BBBBBBBB|

    val blueValue = byteToPaddedBinary(pixelValue & 0xff, 8)
    val greenValue = byteToPaddedBinary((pixelValue & 0xff00) >> 8, 8)
    val redValue = byteToPaddedBinary((pixelValue & 0xff0000) >> 16, 8)
    val alphaValue = byteToPaddedBinary((pixelValue & 0xff000000) >>> 24, 8)


    // Split the binarydata into three parts
    val splitData = binaryDataToHide.split("(?<=\G.{" + binaryDataToHide.length / 3 + "})")

    // Get the modified red blue green values
    val newRed = hideBitsInBinaryString(redValue, splitData(0))
    val newGreen = hideBitsInBinaryString(greenValue, splitData(1))
    val newBlue = hideBitsInBinaryString(blueValue, splitData(2))

    // Convert the binary number to an integer and return it
    new Color(Integer.parseInt(newRed, 2), Integer.parseInt(newGreen, 2),
      Integer.parseInt(newBlue, 2), Integer.parseInt(alphaValue, 2))
}


def hideBitsInBinaryString(binaryString: String, bitsToHide: String): String = {
    // Create a string builder from the binary string
    val binaryStringStringBuilder = new StringBuilder(binaryString)

    // Loop through the bits to hide
    for(i <- 0 until bitsToHide.length) {
      // replace to chars at the end of the string builder
      binaryStringStringBuilder.setCharAt(binaryString.length - bitsToHide.length + i, bitsToHide(i))
      // binaryStringStringBuilder.setCharAt(i, bitsToHide(i))
    }

    // Return the binary string builder to string
    binaryStringStringBuilder.toString()
  }