Function

vImageLookupTable_8to64U(_:_:_:_:)

Uses a lookup table to remap 8-bit unsigned integers in a source image to 64-bit unsigned values.

Declaration

func vImageLookupTable_8to64U(_ src: UnsafePointer<vImage_Buffer>, _ dest: UnsafePointer<vImage_Buffer>, _ LUT: UnsafePointer<UInt64>, _ flags: vImage_Flags) -> vImage_Error

Parameters

src

A pointer to a vImage buffer structure that contains the source image.

dest

A pointer to a vImage buffer data structure. You're responsible for filling out the height, width, and rowBytes fields of this structure, and for allocating a data buffer of the appropriate size. On return, the data buffer this structure points to contains the destination image data. When you no longer need the data buffer, you must deallocate the memory

table

A lookup table that contains 256 values.

flags

The options to use when performing the operation. If you plan to perform your own tiling or use multithreading, pass kvImageDoNotTile.

Return Value

kvImageNoError; otherwise, one of the error codes described in Data Types and Constants.

Discussion

The calculation for each pixel is:

uint64_t table[256];
uint64_t result_pixel = table[ input_8_bit_pixel ];

See Also

Transforming with a Lookup Table