Cirrus Logic CS485 Spezifikationen PDF herunterladen (Seite 151)

Image Filtering

6-17

ColorMedianFilter

Apply a color median

filter to the image.

void iplColorMedianFilter(IplImage*

srcImage

, IplImage*

dstImage

, int

nCols

, int

nRows

, int

anchorX

, int

anchorY

);

srcImage

Thesourceimage.

dstImage

The resultant image.

nCols

Number of columns in the neighborhood to use.

nRows

Number of rows in the neighborhood to use.

anchorX, anchorY

The [x, y] coordinates of the anchor cell in the

neighborhood.

Discussion

The previously described function iplMedianFilter() processes R, G,

and B color planes of an image separately, and as a result any correlation

between color components is lost. If you want to preserve this information,

use the

iplColorMedianFilter() function instead. For each input pixel,

this function computes differences between red, green, and blue

components of pixels in the neighborhood area of size

nRows

nCols

and the input pixel. The ‘distance’ between the input pixel i and the

neighborhood pixel j is formed as sum of absolute values

abs (R(i)-R(j)) + abs (G(i)-G(j)) + abs (B(i)-B(j)) .

After scanning all neighborhood area, the function sets the output value for

pixel i as the value of the neighborhood pixel with the smallest distance to i.

The function

iplColorMedianFilter() supports color images with or

without alpha channel.

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