diff --git a/imageInput.c b/imageInput.c
index bb30de1..f987e39 100644
--- a/imageInput.c
+++ b/imageInput.c
@@ -6,17 +6,209 @@
 #define BUFFER_SIZE 100
 #define FILE_HEADER_STRING "__info2_image_file_format__"
 
-// TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
 
-// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
+/*
+ * Diese Hilfsfunktionen kümmern sich um:
+ * - Das Öffnen der Datei und Überprüfen des Dateinamens
+ * - Das Überprüfen des Headers, um sicherzustellen, dass es sich um die richtige Datei handelt
+ * - Das Einlesen der Metadaten (Anzahl der Bilder, Bildbreite und -höhe)
+ *  -> Die Hilfsfunktionen garantieren, dass die Datei gültig ist, bevor mit dem Einlesen der Bilddaten fortgefahren wird.
+ */
+
+
+static FILE *openImageFile(const char *path) // Checks if the given filename pointer is valid (not NULL).
+{  
+    if (path == NULL)
+    {
+        return NULL;
+    }
+
+    return fopen(path, "rb");  //opening document in binear 
+}
+
+static int readAndCheckHeader(FILE *file) // gets the length of the header text
+{
+    size_t headerLength = strlen(FILE_HEADER_STRING);
+    char buffer[BUFFER_SIZE];
+
+    if (headerLength + 1 > BUFFER_SIZE) //checks if buffer is big enough for header size
+    {
+        return 0;
+    }
+
+    if (fread(buffer, 1, headerLength, file) != headerLength) // Checks if reading the expected number of header bytes from the file succeeded
+    {
+        return 0;
+    }
+
+    buffer[headerLength] = '\0'; // add string terminator so the header becomes a valid C-string
+
+    if (strcmp(buffer, FILE_HEADER_STRING) != 0) // checks if the expected header matches the header read from the file
+    {
+        return 0;
+    }
+
+    return 1; /* Header ok */
+}
+
+
+static int readImageMetaData(FILE *file, // reads the metadata (count, width, height) from the file and stores them in the provided pointers
+                             unsigned short *count,
+                             unsigned short *width,
+                             unsigned short *height)
+{
+    if (fread(count, sizeof(unsigned short), 1, file) != 1) // read the number of images from the file
+    {    
+        return 0;
+    }
+    if (fread(width, sizeof(unsigned short), 1, file) != 1) // reads the image width
+    {
+        return 0;
+    }
+    if (fread(height, sizeof(unsigned short), 1, file) != 1) //reads the image height
+    {
+        return 0;
+    }
+
+    if (*count == 0 || *width == 0 || *height == 0)  // check for invalid metadata (count, width or height cannot be zero)
+    {
+        return 0;
+    }
+
+    return 1;
+}
+
+
+/*
+    Hauptfunktion
+*/
 GrayScaleImageSeries *readImages(const char *path)
 {
-    GrayScaleImageSeries *series = NULL;
-    
+    // 1. Open the file
+    FILE *file = openImageFile(path);
+    if (file == NULL)
+    {
+        return NULL;
+    }
+
+    // 2. Check the header
+    if (!readAndCheckHeader(file))
+    {
+        fclose(file);
+        return NULL;
+    }
+
+    // 3. Read image metadata
+    unsigned short count = 0;
+    unsigned short width = 0;
+    unsigned short height = 0;
+
+    if (!readImageMetaData(file, &count, &width, &height))
+    {
+        fclose(file);
+        return NULL;
+    }
+
+    // 4. Allocate memory for image series
+    GrayScaleImageSeries *series = (GrayScaleImageSeries *)malloc(sizeof(GrayScaleImageSeries)); // Allocate memory for the image series, images, and labels. Return NULL if allocation fails.
+    if (series == NULL)
+    {
+        fclose(file);
+        return NULL;
+    }
+
+    series->count  = count;
+    series->images = (GrayScaleImage *)calloc(count, sizeof(GrayScaleImage));
+    series->labels = (unsigned char *)malloc(count * sizeof(unsigned char));
+
+    if (series->images == NULL || series->labels == NULL)
+    {
+        free(series->images);
+        free(series->labels);
+        free(series);
+        fclose(file);
+        return NULL;
+    }
+
+    // 5. Read the images and labels 
+    for (unsigned int i = 0; i < count; i++)
+    {
+        GrayScaleImage *image = &series->images[i];
+
+        image->width  = (unsigned int)width;
+        image->height = (unsigned int)height;
+
+        size_t numPixels = (size_t)width * (size_t)height;
+
+        image->buffer = (GrayScalePixelType *)malloc(numPixels * sizeof(GrayScalePixelType));
+        if (image->buffer == NULL)
+        {
+            for (unsigned int j = 0; j < i; j++)
+            {
+                free(series->images[j].buffer);
+            }
+            free(series->images);
+            free(series->labels);
+            free(series);
+            fclose(file);
+            return NULL;
+        }
+
+        if (fread(image->buffer, sizeof(GrayScalePixelType), numPixels, file) != numPixels) // Check if the correct number of pixel values (width * height) were read for the image
+        {
+            for (unsigned int j = 0; j <= i; j++)
+            {
+                free(series->images[j].buffer);
+            }
+            free(series->images);
+            free(series->labels);
+            free(series);
+            fclose(file);
+            return NULL;
+        }
+
+        if (fread(&series->labels[i], sizeof(unsigned char), 1, file) != 1) // Check if the label for the image was successfully read (1 byte)
+        {
+            for (unsigned int j = 0; j <= i; j++)
+            {
+                free(series->images[j].buffer);
+            }
+            free(series->images);
+            free(series->labels);
+            free(series);
+            fclose(file);
+            return NULL;
+        }
+    }
+
+    fclose(file);
     return series;
 }
 
 // TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
 void clearSeries(GrayScaleImageSeries *series)
 {
-}
\ No newline at end of file
+    if (series == NULL)
+    {
+        return;
+    }
+
+    if (series->images != NULL)
+    {
+        for (unsigned int i = 0; i < series->count; i++)
+        {
+            free(series->images[i].buffer);
+            series->images[i].buffer = NULL;
+        }
+        free(series->images);
+        series->images = NULL;
+    }
+
+    if (series->labels != NULL)
+    {
+        free(series->labels);
+        series->labels = NULL;
+    }
+
+    free(series);
+}
diff --git a/neuralNetworkTests.c b/neuralNetworkTests.c
index 9be45e2..26551a9 100644
--- a/neuralNetworkTests.c
+++ b/neuralNetworkTests.c
@@ -4,44 +4,44 @@
 #include <math.h>
 #include "unity.h"
 #include "neuralNetwork.h"
-//Dateischichten sind in neuralNetwork.h definiert
-// Dateiname: __info2_neural_network_file_format__
 
+#define FILE_HEADER_STRING "__info2_neural_network_file_format__"
+
+//Testdatei schreiben
 static void prepareNeuralNetworkFile(const char *path, const NeuralNetwork nn)
 {
-    FILE *file = fopen(path, "wb");
-    if (!file) return;
+// Datei öffnen
+FILE *file = fopen(path, "wb");
+if (file == NULL)
+return;
 
-    // Header schreiben
-    fwrite(FILE_HEADER_STRING, 1, strlen(FILE_HEADER_STRING), file);
+// Header inklusive Nullterminator schreiben  
+fwrite(FILE_HEADER_STRING, sizeof(char), strlen(FILE_HEADER_STRING), file);  
 
-    // Anzahl Layer schreiben
-    uint32_t nLayers = nn.numberOfLayers;
-    fwrite(&nLayers, sizeof(uint32_t), 1, file);
+for (unsigned int i = 0; i < nn.numberOfLayers; i++)  
+{  
+    const Layer *layer = &nn.layers[i];  
 
-    for (uint32_t i = 0; i < nLayers; i++) {
-        Layer layer = nn.layers[i];
+      
+    int inputDim = layer->weights.cols;  // Spalten
+    int outputDim = layer->weights.rows;  // Zeilen
 
-        // Weights-Dimensionen
-        uint32_t rW = layer.weights.rows;
-        uint32_t cW = layer.weights.cols;
-        fwrite(&rW, sizeof(uint32_t), 1, file);
-        fwrite(&cW, sizeof(uint32_t), 1, file);
+    // Dimensionen schreiben  
+    fwrite(&inputDim, sizeof(int), 1, file);  
+    fwrite(&outputDim, sizeof(int), 1, file);  
 
-        // Weights-Werte
-        fwrite(layer.weights.buffer, sizeof(MatrixType), rW * cW, file);
+    // Gewichtswerte schreiben  
+    fwrite(layer->weights.buffer, sizeof(MatrixType), layer->weights.rows * layer->weights.cols, file);  
 
-        // Bias-Dimensionen
-        uint32_t rB = layer.biases.rows;
-        uint32_t cB = layer.biases.cols;
-        fwrite(&rB, sizeof(uint32_t), 1, file);
-        fwrite(&cB, sizeof(uint32_t), 1, file);
+    // Biaswerte schreiben
+    fwrite(layer->biases.buffer, sizeof(MatrixType), layer->biases.rows * layer->biases.cols, file);  
+}  
+ 
+int zero = 0;  
+fwrite(&zero, sizeof(int), 1, file);   
 
-        // Bias-Werte
-        fwrite(layer.biases.buffer, sizeof(MatrixType), rB * cB, file);
-    }
-
-    fclose(file);
+// Datei schließen
+fclose(file);  
 }