generated from freudenreichan/info2Praktikum-NeuronalesNetz
86 lines
2.5 KiB
C
86 lines
2.5 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 void readPictureData(FILE *file, unsigned short *ptrPicturesCount, unsigned short *ptrPictureWidth, unsigned short *ptrPictureHeight)
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{
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fread(ptrPicturesCount, sizeof(unsigned short), 1, file);
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fread(ptrPictureWidth, sizeof(unsigned short), 1, file);
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fread(ptrPictureHeight, sizeof(unsigned short), 1, file);
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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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unsigned short picturesCount, pictureWidth, pictureHeight;
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GrayScaleImageSeries *series = malloc(sizeof(GrayScaleImageSeries));
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char line[strlen(FILE_HEADER_STRING)+1];
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FILE *file = fopen(path,"rb");
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//Prüfen auf erfolgreiches Öffnen der Datei
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if (file == NULL){
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printf("failed open file\n");
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return NULL;
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}
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//Prüfen auf übereinstimmung des headers
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fread(line,1, strlen(FILE_HEADER_STRING), file);
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line[strlen(FILE_HEADER_STRING)] = '\0';
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if(strncmp(line, FILE_HEADER_STRING, strlen(FILE_HEADER_STRING))!=0)return NULL;
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//Anzahl, Breite und Höhe der Bilder einlesen
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readPictureData(file, &picturesCount, &pictureWidth, &pictureHeight);
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//Speicher für lables und images zuornden
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series->labels = (unsigned char*)malloc(picturesCount * sizeof(char));
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series->images = (GrayScaleImage*)malloc(picturesCount * sizeof(GrayScaleImage));
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series->count = picturesCount;
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//speicher reservierung für images und Einlesen der Bilddaten und labels
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for(int i = 0; i < picturesCount; i++){
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series->images[i].width = pictureWidth;
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series->images[i].height = pictureHeight;
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series->images[i].buffer = (unsigned char*)malloc(pictureWidth * pictureHeight*sizeof(unsigned char));
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fread(series->images[i].buffer, sizeof(unsigned char), pictureWidth * pictureHeight, file);
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fread(&series->labels[i], sizeof(unsigned char), 1, file);
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}
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fclose(file);
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return series;
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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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for(int i = 0; i < series->count; i++){
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free(series->images[i].buffer);
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}
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free(series->images);
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free(series->labels);
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free(series);
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}
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