inst/tinytest/test-05-kernels.R

In mmand: Mathematical Morphology in Any Number of Dimensions

# Standard kernel arrays
expect_equal(shapeKernel(3), readRDS("line_kernel.rds"))
expect_equal(shapeKernel(c(5,5),type="box"), readRDS("box_kernel.rds"))
expect_equal(shapeKernel(c(5,5),type="disc"), readRDS("disc_kernel.rds"))
expect_equal(shapeKernel(c(5,5),type="diamond"), readRDS("diamond_kernel.rds"))

expect_equal(gaussianKernel(0.5), readRDS("gaussian_kernel_1d.rds"))
expect_equal(gaussianKernel(c(0.5,0.5)), readRDS("gaussian_kernel_2d.rds"))
expect_equal(gaussianKernel(c(0.5,0.5),normalised=FALSE), readRDS("gaussian_kernel_2d_unnorm.rds"))
expect_equal(gaussianKernel(c(0.5,0.3)), readRDS("gaussian_kernel_2d_anis.rds"))

expect_equal(sobelKernel(1), kernelArray(c(1,0,-1)))
expect_equal(sobelKernel(1,0), kernelArray(c(1,2,1)/4))
expect_equal(sobelKernel(2), readRDS("sobel_kernel_2d.rds"))


# Standard kernel functions
expect_equal(boxKernel(), readRDS("box_function.rds"))
expect_equal(triangleKernel(), readRDS("triangle_function.rds"))
expect_equal(mitchellNetravaliKernel(), readRDS("mn_function.rds"))


# Sampling from kernel functions
expect_equal(sampleKernelFunction(boxKernel(),seq(-1,1,0.5)), c(0,1,1,1,0))
expect_equal(sampleKernelFunction(triangleKernel(),seq(-1,1,0.5)), c(0,0.5,1,0.5,0))
expect_equal(sampleKernelFunction(mitchellNetravaliKernel(0,1),seq(-1,1,0.5)), c(0,0.625,1,0.625,0))


# Type testing
expect_true(isKernel(boxKernel()))
expect_true(isKernelFunction(boxKernel()))
expect_false(isKernelArray(boxKernel()))
expect_true(isKernel(shapeKernel(3)))
expect_false(isKernelFunction(shapeKernel(3)))
expect_true(isKernelArray(shapeKernel(3)))


# Plotting
plot(boxKernel())
plot(shapeKernel(3))