Method: Magick::Image#median_filter

Defined in:
ext/RMagick/rmimage.cpp

#median_filter(radius = 0.0) ⇒ Magick::Image

Apply a digital filter that improves the quality of a noisy image. Each pixel is replaced by the median in a set of neighboring pixels as defined by radius.

Returns a new image.

Parameters:

  • radius (Numeric) (defaults to: 0.0) —

    The filter radius.

Returns:



9460
9461
9462
9463
9464
9465
9466
9467
9468
9469
9470
9471
9472
9473
9474
9475
9476
9477
9478
9479
9480
9481
9482
9483
9484
9485
9486
 
# File 'ext/RMagick/rmimage.cpp', line 9460

VALUE
Image_median_filter(int argc, VALUE *argv, VALUE self)
{
    Image *image, *new_image;
    double radius = 0.0;
    ExceptionInfo *exception;

    image = rm_check_destroyed(self);
    switch (argc)
    {
        case 1:
            radius = NUM2DBL(argv[0]);
        case 0:
            break;
        default:
            rb_raise(rb_eArgError, "wrong number of arguments (%d for 0 or 1)", argc);
            break;
    }

    exception = AcquireExceptionInfo();
    GVL_STRUCT_TYPE(StatisticImage) args = { image, MedianStatistic, (size_t)radius, (size_t)radius, exception };
    new_image = (Image *)CALL_FUNC_WITHOUT_GVL(GVL_FUNC(StatisticImage), &args);
    rm_check_exception(exception, new_image, DestroyOnError);
    DestroyExceptionInfo(exception);

    return rm_image_new(new_image);
}