generated from freudenreichan/info2Praktikum-NeuronalesNetz
112 lines
2.9 KiB
C
112 lines
2.9 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "imageInput.h"
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#define BUFFER_SIZE 100
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#define FILE_HEADER_STRING "__info2_image_file_format__"
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// TODO Implementieren Sie geeignete Hilfsfunktionen für das Lesen der Bildserie aus einer Datei
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static int checkHeader (FILE *file)
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{
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char header [strlen (FILE_HEADER_STRING) +1]; //Ermittle die Länge des Strings, +1 wegen Null
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size_t gelesen = fread (header, sizeof(char), strlen(FILE_HEADER_STRING), file);
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if (gelesen == NULL)
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return -1;
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header [strlen (FILE_HEADER_STRING)] = '\0';
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if (strcmp (header, FILE_HEADER_STRING) == 0) //Headerlänge Vergleich
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{
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return 1;
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} else
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{
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return -1;
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}
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}
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static unsigned int readUnit (FILE *file)
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{
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unsigned int value = 0;
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size_t gelesen = fread (&value, sizeof(unsigned int), 1, file); //liest genau 4 Bytes ein
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if (gelesen == NULL)
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return -1;
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return value;
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}
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static GrayScaleImage readSingleImage (FILE *file)
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{
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GrayScaleImage img = NULL;
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//Breite und Höhe einlesen
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size_t gelesenWidth = fread (&img.width, sizeof(unsigned int), 1, file);
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size_t gelesenHeight = fread (&img.height, sizeof(unsigned int), 1, file);
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if (gelesenWidth == NULL || gelesenHeight == NULL)
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return -1;
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//Speicher für Pixel reservieren
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size_t pixelCount = img.width * img.height;
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img.buffer = malloc(pixelCount * sizeof(GrayScalePixelType));
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if (img.buffer == NULL)
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return -1;
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//Pixel einlesen
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size_t gelesenPixels = fread (img.buffer, sizeof(GrayScalePixelType), pixelCount, file);
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if (gelesenPixels != pixelCount)
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return -1;
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return img;
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}
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static unsigned char readLabel (FILE *file)
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{
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unsigned char label = NULL;
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size_t gelesen = fread (&label, sizeof(unsigned char), 1, file);
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if (gelesen == NULL)
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return -1;
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return label;
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}
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// TODO Vervollständigen Sie die Funktion readImages unter Benutzung Ihrer Hilfsfunktionen
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GrayScaleImageSeries *readImages(const char *path)
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{
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GrayScaleImageSeries *series = NULL;
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unsigend int count = NULL;
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FILE *file = fopen(path, "rb");
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if (path == NULL) {
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return -1;
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}
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if (checkHeader(file) != 1) {
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return -1;
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}
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count = readUnit (file);
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series = malloc (sizeof(GrayScaleImageSeries));
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series ->count = count;
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series ->images = malloc (count * sizeof(GrayScaleImage));
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series ->labels = malloc (count * sizeof(unsigned char));
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for (unsigned int i = 0; i < count; i++)
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{
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series ->images[i] = readSingleImage(file);
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series ->labels[i] = readLabel(file);
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}
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fclose (file);
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return series; //series ist das array das ein Bild besitzt
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}
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// TODO Vervollständigen Sie die Funktion clearSeries, welche eine Bildserie vollständig aus dem Speicher freigibt
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void clearSeries(GrayScaleImageSeries *series)
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{
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} |