Cirrus Logic CS485 Specifiche Scaricare il pdf (Pagina 141)

100

101

Image Filtering

6-7

nCols, nRows

Numbers of columns and rows in the convolution

kernel. Set by the function.

anchorX, anchorY

Pointers to the [x, y] coordinates of the anchor

cell in the kernel. (See iplCreateConvKernel

above.) Set by the function.

values

A pointer to an array of values to be used for the

kernel matrix. The values are read in row-major

form starting with the top left corner. There will

be exactly

nRows

nCols

entries in this array.

For example, the array [1, 2, 3, 4, 5, 6, 7, 8, 9]

would represent the kernel matrix

123

456

789

nShiftR

A pointer to the number of bits to shift (to the

right) the resulting output pixel of each

convolution. Set by the function.

Discussion

Functions iplGetConvKernel() and iplGetConvKernelFP() are used to

read the convolution kernel attributes. The

iplGetConvKernelChar()

function serves primarily for compatibility with previous releases. It gives

you 1-byte

char rather than integer values of the convolution kernel; you’ll

probably need this function only if you create kernels using

iplCreateConvKernelChar().

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