Exemplo n.º 1
0
func NewHorizontalKernel(width int, f func(x int) float64) Kernel {
	if !correct(width) {
		utils.Warn("Error: kernel size wrong!")
		os.Exit(2)
	}

	mx := (width - 1) / 2
	k := [][]float64{make([]float64, width)}

	for x := 0; x < width; x++ {
		k[0][x] = f(mx - x)
	}

	return k
}
Exemplo n.º 2
0
func NewVerticalKernel(height int, f func(y int) float64) Kernel {
	if !correct(height) {
		utils.Warn("Error: kernel size wrong!")
		os.Exit(2)
	}

	my := (height - 1) / 2
	k := make([][]float64, height)

	for y := 0; y < height; y++ {
		k[y] = []float64{f(my - y)}
	}

	return k
}
Exemplo n.º 3
0
func runBlur(cmd *Command, args []string) {
	if _, ok := styleNames[blurStyle]; !ok {
		utils.Warn("--style must be one of 'clamp', 'ignore' or 'wrap'")
		os.Exit(2)
	}

	style, _ := styleNames[blurStyle]

	i := utils.ReadStdin()

	if blurBox {
		i = blur.Box(i, blurRadius, style)
	} else {
		i = blur.Gaussian(i, blurRadius, blurGaussian, style)
	}

	utils.WriteStdout(i)
}
Exemplo n.º 4
0
// NewKernel creates a new Kernel of the dimensions given, it is populated by
// the given function which itself is passed the signed x and y offsets from the
// mid point.
func NewKernel(height, width int, f func(x, y int) float64) Kernel {
	if !correct(width) || !correct(height) {
		utils.Warn("Error: kernel size wrong!")
		os.Exit(2)
		// should return error really!
	}

	mx := (width - 1) / 2
	my := (height - 1) / 2
	k := make([][]float64, height)

	for y := 0; y < height; y++ {
		k[y] = make([]float64, width)
		for x := 0; x < width; x++ {
			k[y][x] = f(mx-x, my-y)
		}
	}

	return k
}