diff --git a/CMakeLists.txt b/CMakeLists.txt
index d6a22d7..3cfc6a7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -368,6 +368,7 @@ set(PUBLICHEADERS
 
 
 set(SourceFiles
+    ${CMAKE_CURRENT_SOURCE_DIR}/src/calibration.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/src/CtbRawFile.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/src/decode.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/src/defs.cpp
diff --git a/include/aare/NDView.hpp b/include/aare/NDView.hpp
index 28f5371..4c16742 100644
--- a/include/aare/NDView.hpp
+++ b/include/aare/NDView.hpp
@@ -66,17 +66,28 @@ class NDView : public ArrayExpr<NDView<T, Ndim>, Ndim> {
         : buffer_(buffer), strides_(c_strides<Ndim>(shape)), shape_(shape),
           size_(std::accumulate(std::begin(shape), std::end(shape), 1,
                                 std::multiplies<>())) {}
-
+                   
     template <typename... Ix>
     std::enable_if_t<sizeof...(Ix) == Ndim, T &> operator()(Ix... index) {
         return buffer_[element_offset(strides_, index...)];
     }
 
     template <typename... Ix>
-    const std::enable_if_t<sizeof...(Ix) == Ndim, T &> operator()(Ix... index) const {
+    std::enable_if_t<sizeof...(Ix) == 1 && (Ndim > 1), NDView<T, Ndim - 1>> operator()(Ix... index) {
+        // return a view of the next dimension
+        std::array<ssize_t, Ndim - 1> new_shape{};
+        std::copy_n(shape_.begin() + 1, Ndim - 1, new_shape.begin());
+        return NDView<T, Ndim - 1>(&buffer_[element_offset(strides_, index...)],
+                                   new_shape);
+        
+    }
+
+    template <typename... Ix>
+    std::enable_if_t<sizeof...(Ix) == Ndim, const T &> operator()(Ix... index) const {
         return buffer_[element_offset(strides_, index...)];
     }
 
+
     ssize_t size() const { return static_cast<ssize_t>(size_); }
     size_t total_bytes() const { return size_ * sizeof(T); }
     std::array<ssize_t, Ndim> strides() const noexcept { return strides_; }
@@ -85,9 +96,19 @@ class NDView : public ArrayExpr<NDView<T, Ndim>, Ndim> {
     T *end() { return buffer_ + size_; }
     T const *begin() const { return buffer_; }
     T const *end() const { return buffer_ + size_; }
-    T &operator()(ssize_t i)  { return buffer_[i]; }
+    
+    
+
+
+
+    /**
+     * @brief Access element at index i.
+     */
     T &operator[](ssize_t i)  { return buffer_[i]; }
-    const T &operator()(ssize_t i) const { return buffer_[i]; }
+
+    /**
+     * @brief Access element at index i.
+     */
     const T &operator[](ssize_t i) const { return buffer_[i]; }
 
     bool operator==(const NDView &other) const {
diff --git a/include/aare/VarClusterFinder.hpp b/include/aare/VarClusterFinder.hpp
index 3679d39..a002f9b 100644
--- a/include/aare/VarClusterFinder.hpp
+++ b/include/aare/VarClusterFinder.hpp
@@ -240,14 +240,14 @@ template <typename T> void VarClusterFinder<T>::first_pass() {
 
     for (ssize_t i = 0; i < original_.size(); ++i) {
         if (use_noise_map)
-            threshold_ = 5 * noiseMap(i);
-        binary_(i) = (original_(i) > threshold_);
+            threshold_ = 5 * noiseMap[i];
+        binary_[i] = (original_[i] > threshold_);
     }
 
     for (int i = 0; i < shape_[0]; ++i) {
         for (int j = 0; j < shape_[1]; ++j) {
 
-            // do we have someting to process?
+            // do we have something to process?
             if (binary_(i, j)) {
                 auto tmp = check_neighbours(i, j);
                 if (tmp != 0) {
diff --git a/include/aare/calibration.hpp b/include/aare/calibration.hpp
index aab1f89..8d672b4 100644
--- a/include/aare/calibration.hpp
+++ b/include/aare/calibration.hpp
@@ -1,5 +1,7 @@
 #pragma once
 
+#include "aare/NDArray.hpp"
+#include "aare/NDView.hpp"
 #include "aare/defs.hpp"
 #include "aare/utils/task.hpp"
 #include <cstdint>
@@ -55,32 +57,227 @@ ALWAYS_INLINE std::pair<uint16_t, int16_t> get_value_and_gain(uint16_t raw) {
 
 template <class T>
 void apply_calibration_impl(NDView<T, 3> res, NDView<uint16_t, 3> raw_data,
-                       NDView<T, 3> ped, NDView<T, 3> cal, int start,
-                       int stop) {
+                            NDView<T, 3> ped, NDView<T, 3> cal, int start,
+                            int stop) {
 
     for (int frame_nr = start; frame_nr != stop; ++frame_nr) {
         for (int row = 0; row != raw_data.shape(1); ++row) {
             for (int col = 0; col != raw_data.shape(2); ++col) {
-                auto [value, gain] = get_value_and_gain(raw_data(frame_nr, row, col));
+                auto [value, gain] =
+                    get_value_and_gain(raw_data(frame_nr, row, col));
+
+                // Using multiplication does not seem to speed up the code here
+                // ADU/keV is the standard unit for the calibration which
+                // means rewriting the formula is not worth it.
                 res(frame_nr, row, col) =
-                    (value - ped(gain, row, col)) / cal(gain, row, col); //TODO! use multiplication
+                    (value - ped(gain, row, col)) / cal(gain, row, col);
             }
         }
     }
 }
 
 template <class T>
+void apply_calibration_impl(NDView<T, 3> res, NDView<uint16_t, 3> raw_data,
+                            NDView<T, 2> ped, NDView<T, 2> cal, int start,
+                            int stop) {
+
+    for (int frame_nr = start; frame_nr != stop; ++frame_nr) {
+        for (int row = 0; row != raw_data.shape(1); ++row) {
+            for (int col = 0; col != raw_data.shape(2); ++col) {
+                auto [value, gain] =
+                    get_value_and_gain(raw_data(frame_nr, row, col));
+
+                // Using multiplication does not seem to speed up the code here
+                // ADU/keV is the standard unit for the calibration which
+                // means rewriting the formula is not worth it.
+
+                // ignore anything that is not gain 0
+                // TODO! deal with fixed gain?
+                if (gain == 0)
+                    res(frame_nr, row, col) =
+                        (value - ped(row, col)) / cal(row, col);
+            }
+        }
+    }
+}
+
+template <class T, ssize_t Ndim=3>
 void apply_calibration(NDView<T, 3> res, NDView<uint16_t, 3> raw_data,
-                       NDView<T, 3> ped, NDView<T, 3> cal,
+                       NDView<T, Ndim> ped, NDView<T, Ndim> cal,
                        ssize_t n_threads = 4) {
     std::vector<std::future<void>> futures;
     futures.reserve(n_threads);
     auto limits = split_task(0, raw_data.shape(0), n_threads);
     for (const auto &lim : limits)
-        futures.push_back(std::async(&apply_calibration_impl<T>, res, raw_data, ped, cal,
-                                     lim.first, lim.second));
+        futures.push_back(std::async(
+            static_cast<void (*)(NDView<T, 3>, NDView<uint16_t, 3>,
+                                 NDView<T, Ndim>, NDView<T, Ndim>, int, int)>(
+                apply_calibration_impl),
+            res, raw_data, ped, cal, lim.first, lim.second));
     for (auto &f : futures)
         f.get();
 }
 
+std::pair<NDArray<size_t, 3>, NDArray<size_t, 3>>
+sum_and_count_per_gain(NDView<uint16_t, 3> raw_data);
+
+std::pair<NDArray<size_t, 2>, NDArray<size_t, 2>>
+sum_and_count_g0(NDView<uint16_t, 3> raw_data);
+
+template <typename T>
+NDArray<T, 3> calculate_pedestal(NDView<uint16_t, 3> raw_data) {
+    auto [accumulator, count] = sum_and_count_per_gain(raw_data);
+
+    NDArray<T, 3> pedestal(
+        std::array<ssize_t, 3>{3, raw_data.shape(1), raw_data.shape(2)}, 0);
+    for (int gain = 0; gain < 3; ++gain) {
+        for (int row = 0; row < raw_data.shape(1); ++row) {
+            for (int col = 0; col < raw_data.shape(2); ++col) {
+                if (count(gain, row, col) != 0) {
+                    pedestal(gain, row, col) =
+                        static_cast<T>(accumulator(gain, row, col)) /
+                        static_cast<T>(count(gain, row, col));
+                }
+            }
+        }
+    }
+    return pedestal;
+}
+
+template <typename T>
+NDArray<T, 2> calculate_pedestal_g0(NDView<uint16_t, 3> raw_data) {
+    auto [accumulator, count] = sum_and_count_g0(raw_data);
+
+    NDArray<T, 2> pedestal(
+        std::array<ssize_t, 2>{raw_data.shape(1), raw_data.shape(2)}, 0);
+    for (int row = 0; row < raw_data.shape(1); ++row) {
+        for (int col = 0; col < raw_data.shape(2); ++col) {
+            if (count(row, col) != 0) {
+                pedestal(row, col) =
+                    static_cast<T>(accumulator(row, col)) /
+                    static_cast<T>(count(row, col));
+            }
+        }
+    }
+    return pedestal;
+}
+template <typename T>
+NDArray<T, 2> calculate_pedestal_g0(NDView<uint16_t, 3> raw_data,
+                                 ssize_t n_threads) {
+    std::vector<std::future<std::pair<NDArray<size_t, 2>, NDArray<size_t, 2>>>>
+        futures;
+    futures.reserve(n_threads);
+    auto limits = split_task(0, raw_data.shape(0), n_threads);  
+    // make subviews for each thread
+    std::vector<NDView<uint16_t, 3>> subviews;
+    for (const auto &lim : limits) {
+        subviews.emplace_back(
+            raw_data.data() + lim.first * raw_data.strides()[0],
+            std::array<ssize_t, 3>{lim.second - lim.first, raw_data.shape(1),
+                                   raw_data.shape(2)});
+    }
+    for (auto view : subviews) {
+        futures.push_back(std::async(
+            static_cast<std::pair<NDArray<size_t, 2>, NDArray<size_t, 2>> (*)(
+                NDView<uint16_t, 3>)>(&sum_and_count_g0),
+            view));
+    }
+    NDArray<size_t, 2> accumulator(
+        std::array<ssize_t, 2>{raw_data.shape(1), raw_data.shape(2)}, 0);
+    NDArray<size_t, 2> count(
+        std::array<ssize_t, 2>{raw_data.shape(1), raw_data.shape(2)}, 0);
+    for (auto &f : futures) {
+        auto [acc, cnt] = f.get();
+        accumulator += acc;
+        count += cnt;
+    }
+    NDArray<T, 2> pedestal(
+        std::array<ssize_t,2>{raw_data.shape(1), raw_data.shape(2)}, 0);
+    for (int gain = 0; gain < 3; ++gain) {
+        for (int row = 0; row < raw_data.shape(1); ++row) {
+            for (int col = 0; col < raw_data.shape(2); ++col) {
+                if (count(row, col) != 0) {
+                    pedestal(row, col) =
+                        static_cast<T>(accumulator(row, col)) /
+                        static_cast<T>(count(row, col));
+                }
+            }
+        }
+    }
+    return pedestal;
+
+}
+
+
+template <typename T>
+NDArray<T, 3> calculate_pedestal(NDView<uint16_t, 3> raw_data,
+                                 ssize_t n_threads) {
+    NDArray<int, 2> switched(
+        std::array<ssize_t, 2>{raw_data.shape(1), raw_data.shape(2)}, 0);
+    std::vector<std::future<std::pair<NDArray<size_t, 3>, NDArray<size_t, 3>>>>
+        futures;
+    futures.reserve(n_threads);
+    auto limits = split_task(0, raw_data.shape(0), n_threads);
+
+    // make subviews for each thread
+    std::vector<NDView<uint16_t, 3>> subviews;
+    for (const auto &lim : limits) {
+        subviews.emplace_back(
+            raw_data.data() + lim.first * raw_data.strides()[0],
+            std::array<ssize_t, 3>{lim.second - lim.first, raw_data.shape(1),
+                                   raw_data.shape(2)});
+    }
+    for (auto view : subviews) {
+        futures.push_back(std::async(
+            static_cast<std::pair<NDArray<size_t, 3>, NDArray<size_t, 3>> (*)(
+                NDView<uint16_t, 3>)>(&sum_and_count_per_gain),
+            view));
+    }
+
+    NDArray<size_t, 3> accumulator(
+        std::array<ssize_t, 3>{3, raw_data.shape(1), raw_data.shape(2)}, 0);
+    NDArray<size_t, 3> count(
+        std::array<ssize_t, 3>{3, raw_data.shape(1), raw_data.shape(2)}, 0);
+    for (auto &f : futures) {
+        auto [acc, cnt] = f.get();
+        accumulator += acc;
+        count += cnt;
+    }
+
+    NDArray<T, 3> pedestal(
+        std::array<ssize_t, 3>{3, raw_data.shape(1), raw_data.shape(2)}, 0);
+    for (int gain = 0; gain < 3; ++gain) {
+        for (int row = 0; row < raw_data.shape(1); ++row) {
+            for (int col = 0; col < raw_data.shape(2); ++col) {
+                if (count(gain, row, col) != 0) {
+                    pedestal(gain, row, col) =
+                        static_cast<T>(accumulator(gain, row, col)) /
+                        static_cast<T>(count(gain, row, col));
+                }
+            }
+        }
+    }
+    return pedestal;
+}
+
+/**
+ * @brief Count the number of switching pixels in the raw data.
+ * This function counts the number of pixels that switch between G1 and G2 gain.
+ * It returns an NDArray with the number of switching pixels per pixel.
+ * @param raw_data The NDView containing the raw data
+ * @return An NDArray with the number of switching pixels per pixel
+ */
+NDArray<int, 2> count_switching_pixels(NDView<uint16_t, 3> raw_data);
+
+/**
+ * @brief Count the number of switching pixels in the raw data.
+ * This function counts the number of pixels that switch between G1 and G2 gain.
+ * It returns an NDArray with the number of switching pixels per pixel.
+ * @param raw_data The NDView containing the raw data
+ * @param n_threads The number of threads to use for parallel processing
+ * @return An NDArray with the number of switching pixels per pixel
+ */
+NDArray<int, 2> count_switching_pixels(NDView<uint16_t, 3> raw_data,
+                                       ssize_t n_threads);
+
 } // namespace aare
\ No newline at end of file
diff --git a/python/aare/__init__.py b/python/aare/__init__.py
index c48da49..1d34a85 100644
--- a/python/aare/__init__.py
+++ b/python/aare/__init__.py
@@ -32,6 +32,7 @@ from .utils import random_pixels, random_pixel, flat_list, add_colorbar
 from .func import *
 
 from .calibration import *
-from ._aare import apply_calibration
+from ._aare import apply_calibration, count_switching_pixels
+from ._aare import calculate_pedestal, calculate_pedestal_float, calculate_pedestal_g0, calculate_pedestal_g0_float
 
 from ._aare import VarClusterFinder
diff --git a/python/src/bind_calibration.hpp b/python/src/bind_calibration.hpp
index df4b207..d2e43f1 100644
--- a/python/src/bind_calibration.hpp
+++ b/python/src/bind_calibration.hpp
@@ -17,19 +17,60 @@ py::array_t<DataType> pybind_apply_calibration(
         calibration,
     int n_threads = 4) {
 
-    auto data_span = make_view_3d(data);
-    auto ped = make_view_3d(pedestal);
-    auto cal = make_view_3d(calibration);
-
+    auto data_span = make_view_3d(data); // data is always 3D
     /* No pointer is passed, so NumPy will allocate the buffer */
     auto result = py::array_t<DataType>(data_span.shape());
     auto res = make_view_3d(result);
-
-    aare::apply_calibration<DataType>(res, data_span, ped, cal, n_threads);
-
+    if (data.ndim() == 3 && pedestal.ndim() == 3 && calibration.ndim() == 3) {
+        auto ped = make_view_3d(pedestal);
+        auto cal = make_view_3d(calibration);
+        aare::apply_calibration<DataType, 3>(res, data_span, ped, cal,
+                                             n_threads);
+    } else if (data.ndim() == 3 && pedestal.ndim() == 2 &&
+               calibration.ndim() == 2) {
+        auto ped = make_view_2d(pedestal);
+        auto cal = make_view_2d(calibration);
+        aare::apply_calibration<DataType, 2>(res, data_span, ped, cal,
+                                             n_threads);
+    } else {
+        throw std::runtime_error(
+            "Invalid number of dimensions for data, pedestal or calibration");
+    }
     return result;
 }
 
+py::array_t<int> pybind_count_switching_pixels(
+    py::array_t<uint16_t, py::array::c_style | py::array::forcecast> data,
+    ssize_t n_threads = 4) {
+
+    auto data_span = make_view_3d(data);
+    auto arr = new NDArray<int, 2>{};
+    *arr = aare::count_switching_pixels(data_span, n_threads);
+    return return_image_data(arr);
+}
+
+template <typename T>
+py::array_t<T> pybind_calculate_pedestal(
+    py::array_t<uint16_t, py::array::c_style | py::array::forcecast> data,
+    ssize_t n_threads) {
+
+    auto data_span = make_view_3d(data);
+    auto arr = new NDArray<T, 3>{};
+    *arr = aare::calculate_pedestal<T>(data_span, n_threads);
+    return return_image_data(arr);
+}
+
+template <typename T>
+py::array_t<T> pybind_calculate_pedestal_g0(
+    py::array_t<uint16_t, py::array::c_style | py::array::forcecast> data,
+    ssize_t n_threads) {
+
+    auto data_span = make_view_3d(data);
+    auto arr = new NDArray<T, 2>{};
+    *arr = aare::calculate_pedestal_g0<T>(data_span, n_threads);
+    return return_image_data(arr);
+}
+
 void bind_calibration(py::module &m) {
     m.def("apply_calibration", &pybind_apply_calibration<float>,
           py::arg("raw_data").noconvert(), py::kw_only(),
@@ -40,4 +81,20 @@ void bind_calibration(py::module &m) {
           py::arg("raw_data").noconvert(), py::kw_only(),
           py::arg("pd").noconvert(), py::arg("cal").noconvert(),
           py::arg("n_threads") = 4);
+
+    m.def("count_switching_pixels", &pybind_count_switching_pixels,
+          py::arg("raw_data").noconvert(), py::kw_only(),
+          py::arg("n_threads") = 4);
+
+    m.def("calculate_pedestal_float", &pybind_calculate_pedestal<float>,
+          py::arg("raw_data").noconvert(), py::arg("n_threads") = 4);
+
+    m.def("calculate_pedestal", &pybind_calculate_pedestal<double>,
+          py::arg("raw_data").noconvert(), py::arg("n_threads") = 4);
+
+    m.def("calculate_pedestal_g0", &pybind_calculate_pedestal_g0<double>,
+          py::arg("raw_data").noconvert(), py::arg("n_threads") = 4);
+
+    m.def("calculate_pedestal_g0_float", &pybind_calculate_pedestal_g0<float>,
+          py::arg("raw_data").noconvert(), py::arg("n_threads") = 4);
 }
\ No newline at end of file
diff --git a/src/NDArray.test.cpp b/src/NDArray.test.cpp
index 91b5933..9af8379 100644
--- a/src/NDArray.test.cpp
+++ b/src/NDArray.test.cpp
@@ -25,13 +25,13 @@ TEST_CASE("Construct from an NDView") {
     REQUIRE(image.data() != view.data());
 
     for (uint32_t i = 0; i < image.size(); ++i) {
-        REQUIRE(image(i) == view(i));
+        REQUIRE(image[i] == view[i]);
     }
 
     // Changing the image doesn't change the view
     image = 43;
     for (uint32_t i = 0; i < image.size(); ++i) {
-        REQUIRE(image(i) != view(i));
+        REQUIRE(image[i] != view[i]);
     }
 }
 
diff --git a/src/calibration.cpp b/src/calibration.cpp
new file mode 100644
index 0000000..c5578e3
--- /dev/null
+++ b/src/calibration.cpp
@@ -0,0 +1,78 @@
+#include "aare/calibration.hpp"
+
+namespace aare {
+
+std::pair<NDArray<size_t, 3>, NDArray<size_t,3>> sum_and_count_per_gain(NDView<uint16_t,3> raw_data){
+    NDArray<size_t, 3> accumulator(std::array<ssize_t, 3>{3, raw_data.shape(1), raw_data.shape(2)}, 0);
+    NDArray<size_t, 3> count(std::array<ssize_t, 3>{3, raw_data.shape(1), raw_data.shape(2)}, 0);
+    for (int frame_nr = 0; frame_nr != raw_data.shape(0); ++frame_nr) {
+        for (int row = 0; row != raw_data.shape(1); ++row) {
+            for (int col = 0; col != raw_data.shape(2); ++col) {
+                auto [value, gain] = get_value_and_gain(raw_data(frame_nr, row, col));
+                accumulator(gain, row, col) += value;
+                count(gain, row, col) += 1;
+            }
+        }
+    }
+
+    return {std::move(accumulator), std::move(count)};
+}
+
+std::pair<NDArray<size_t, 2>, NDArray<size_t,2>> sum_and_count_g0(NDView<uint16_t, 3> raw_data){
+    NDArray<size_t, 2> accumulator(std::array<ssize_t, 2>{raw_data.shape(1), raw_data.shape(2)}, 0);
+    NDArray<size_t, 2> count(std::array<ssize_t, 2>{raw_data.shape(1), raw_data.shape(2)}, 0);
+    for (int frame_nr = 0; frame_nr != raw_data.shape(0); ++frame_nr) {
+        for (int row = 0; row != raw_data.shape(1); ++row) {
+            for (int col = 0; col != raw_data.shape(2); ++col) {
+                auto [value, gain] = get_value_and_gain(raw_data(frame_nr, row, col));
+                if (gain != 0)
+                    continue; // we only care about gain 0
+                accumulator(row, col) += value;
+                count(row, col) += 1;
+            }
+        }
+    }
+
+    return {std::move(accumulator), std::move(count)};
+}
+
+NDArray<int, 2> count_switching_pixels(NDView<uint16_t, 3> raw_data) {
+    NDArray<int, 2> switched(std::array<ssize_t, 2>{raw_data.shape(1), raw_data.shape(2)},0);
+    for (int frame_nr = 0; frame_nr != raw_data.shape(0); ++frame_nr) {
+        for (int row = 0; row != raw_data.shape(1); ++row) {
+            for (int col = 0; col != raw_data.shape(2); ++col) {
+                auto [value, gain] = get_value_and_gain(raw_data(frame_nr, row, col));
+                if (gain != 0) {
+                    switched(row, col) += 1;
+                }
+            }
+        }
+    }
+    return switched;
+}
+
+
+NDArray<int, 2> count_switching_pixels(NDView<uint16_t, 3> raw_data, ssize_t n_threads){
+    NDArray<int, 2> switched(std::array<ssize_t, 2>{raw_data.shape(1), raw_data.shape(2)},0);
+    std::vector<std::future<NDArray<int, 2>>> futures;
+    futures.reserve(n_threads);
+    auto limits = split_task(0, raw_data.shape(0), n_threads);
+
+    // make subviews for each thread
+    std::vector<NDView<uint16_t, 3>> subviews;
+    for (const auto &lim : limits) {
+        subviews.emplace_back(raw_data.data() + lim.first * raw_data.strides()[0],
+                              std::array<ssize_t, 3>{lim.second-lim.first, raw_data.shape(1), raw_data.shape(2)});
+    }
+
+    for (auto view : subviews) {
+        futures.push_back(std::async(static_cast<NDArray<int, 2>(*)(NDView<uint16_t, 3>)>(&count_switching_pixels), view));
+    }
+    
+    for (auto &f : futures) {
+        switched += f.get();
+    }
+    return switched;
+}
+
+}// namespace aare
\ No newline at end of file