**Input image:**

**Showing:**

**Drawing convergence:**

Gamma

Threshold

Saturation

**Projection:**

**Projection:**

**Projection:**

**Generating Elements:**

**Line width: **

**Number of elements:**

**Basic triangle:**

Rotational symmetries at intersection between:

straight lines | |

circle and upper line | |

circle and lower line |

**Center circle:**

Rotational symmetries at intersection with

basic circle | |

upper line | |

lower line |

**Resulting secondary triangles:**

both lines and center circle:

upper line and both circles:

lower line and both circles:

**Symmetry operations:**

**Output image:**

**Output image size:**