C# Class ZXing.PlanarYUVLuminanceSource

This object extends LuminanceSource around an array of YUV data returned from the camera driver, with the option to crop to a rectangle within the full data. This can be used to exclude superfluous pixels around the perimeter and speed up decoding. It works for any pixel format where the Y channel is planar and appears first, including YCbCr_420_SP and YCbCr_422_SP. @author [email protected] (Daniel Switkin)

Inheritance: ZXing.BaseLuminanceSource

Show file Open project: Redth/ZXing.Net.Mobile Class Usage Examples

Public Methods

Method	Description
PlanarYUVLuminanceSource ( byte yuvData, int dataWidth, int dataHeight, int left, int top, int width, int height, bool reverseHoriz ) : System	Initializes a new instance of the PlanarYUVLuminanceSource class.
crop ( int left, int top, int width, int height ) : ZXing.LuminanceSource	Returns a new object with cropped image data. Implementations may keep a reference to the original data rather than a copy. Only callable if CropSupported is true.
getRow ( int y, byte row ) : byte[]	Fetches one row of luminance data from the underlying platform's bitmap. Values range from 0 (black) to 255 (white). Because Java does not have an unsigned byte type, callers will have to bitwise and with 0xff for each value. It is preferable for implementations of this method to only fetch this row rather than the whole image, since no 2D Readers may be installed and getMatrix() may never be called.
renderThumbnail ( ) : int[]	Renders the cropped greyscale bitmap.

Protected Methods

Method	Description
CreateLuminanceSource ( byte newLuminances, int width, int height ) : ZXing.LuminanceSource

Private Methods

Method	Description
PlanarYUVLuminanceSource ( byte luminances, int width, int height ) : System	Initializes a new instance of the PlanarYUVLuminanceSource class.
reverseHorizontal ( int width, int height ) : void

Method Details

CreateLuminanceSource() protected method

protected CreateLuminanceSource ( byte newLuminances, int width, int height ) : ZXing.LuminanceSource
newLuminances	byte
width	int
height	int
return	ZXing.LuminanceSource

PlanarYUVLuminanceSource() public method

Initializes a new instance of the PlanarYUVLuminanceSource class.

public PlanarYUVLuminanceSource ( byte yuvData, int dataWidth, int dataHeight, int left, int top, int width, int height, bool reverseHoriz ) : System
yuvData	byte	The yuv data.
dataWidth	int	Width of the data.
dataHeight	int	Height of the data.
left	int	The left.
top	int	The top.
width	int	The width.
height	int	The height.
reverseHoriz	bool	if set to true [reverse horiz].
return	System

crop() public method

Returns a new object with cropped image data. Implementations may keep a reference to the original data rather than a copy. Only callable if CropSupported is true.

public crop ( int left, int top, int width, int height ) : ZXing.LuminanceSource
left	int	The left coordinate, 0 <= left < Width.
top	int	The top coordinate, 0 <= top <= Height.
width	int	The width of the rectangle to crop.
height	int	The height of the rectangle to crop.
return	ZXing.LuminanceSource

getRow() public method

Fetches one row of luminance data from the underlying platform's bitmap. Values range from 0 (black) to 255 (white). Because Java does not have an unsigned byte type, callers will have to bitwise and with 0xff for each value. It is preferable for implementations of this method to only fetch this row rather than the whole image, since no 2D Readers may be installed and getMatrix() may never be called.

public getRow ( int y, byte row ) : byte[]
y	int	The row to fetch, 0 <= y < Height.
row	byte	An optional preallocated array. If null or too small, it will be ignored. /// Always use the returned object, and ignore the .length of the array.
return	byte[]

renderThumbnail() public method

Renders the cropped greyscale bitmap.

public renderThumbnail ( ) : int[]
return	int[]