VerzatileDevOrg · Sommos · Aug 18, 2023 · Aug 17, 2023 · Aug 17, 2023 · Aug 18, 2023
diff --git a/C_image_processing/.gitignore b/C_image_processing/.gitignore
@@ -0,0 +1,126 @@
+# File created using '.gitignore Generator' for Visual Studio Code: https://bit.ly/vscode-gig
+# Created by https://www.toptal.com/developers/gitignore/api/windows,visualstudiocode,c,c++
+# Edit at https://www.toptal.com/developers/gitignore?templates=windows,visualstudiocode,c,c++
+
+### C ###
+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+
+### C++ ###
+# Prerequisites
+
+# Compiled Object files
+*.slo
+
+# Precompiled Headers
+
+# Compiled Dynamic libraries
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+
+# Executables
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/*.code-snippets
+
+# Local History for Visual Studio Code
+.history/
+
+# Built Visual Studio Code Extensions
+*.vsix
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+.ionide
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# End of https://www.toptal.com/developers/gitignore/api/windows,visualstudiocode,c,c++
+
+# Custom rules (everything added below won't be overriden by 'Generate .gitignore File' if you use 'Update' option)
+output.bmp
diff --git a/assets/images/test_image.bmp → ...e_processing/assets/images/test_image.bmp b/assets/images/test_image.bmp → ...e_processing/assets/images/test_image.bmp
diff --git a/filters/black_and_white_filter.c → ...ocessing/filters/black_and_white_filter.c b/filters/black_and_white_filter.c → ...ocessing/filters/black_and_white_filter.c
@@ -1,44 +1,55 @@
 #include <stdio.h>
-#define THRESHOLD 128 // define tha value of the threshold for black and white
-#define WHITE 255 // define the value for white pixels
-#define BLACK 0 // define the value for black pixels
-#define CHUNK_SIZE 1024 // define the size of the chunks to read and write
-
-int black_and_white_filter(inputFile, outputFile) {
-    FILE *fileIn = fopen(inputFile, "rb"); // open the input file for reading in binary mode
-    FILE *fileOut = fopen(outputFile, "wb+"); // create the output file for writing in binary mode
-    int i; // variable to iterate through the image data
-    unsigned char byte[54]; // array to store the header information of the image
-    unsigned char colorTable[1024]; // array to store the color table of the image
-    // check if the input file exists
-    if(fileIn == NULL) {
+#define THRESHOLD 128 // define value of threshold for black and white
+#define WHITE 255
+#define BLACK 0
+#define CHUNK_SIZE 1024 // define size of chunks to read and write
+
+int black_and_white_filter(const char *inputFile, const char *outputFile) {
+
+    FILE *fileIn = fopen(inputFile, "rb");
+    FILE *fileOut = fopen(outputFile, "wb+");
+
+    if (fileIn == NULL || fileOut == NULL) {
         printf("File does not exist.\n");
+        if (fileIn != NULL) fclose(fileIn);
+        if (fileOut != NULL) fclose(fileOut);
         return 1;
     }
-    // read the header information of the image
+
+    int i;
+    unsigned char byte[54];
+    unsigned char colorTable[1024];
+
+    // read header info of image
     for(i = 0; i < 54; i++) {
         byte[i] = getc(fileIn);
     }
-    // write the header information to the output file
+
+    // write header info to output file
     fwrite(byte, sizeof(unsigned char), 54, fileOut);
-    // extract the height, width and bitDepth of the image from the header information
+
+    // extract height, width and bitDepth of image from the header information
     int height = *(int*)&byte[18];
     int width = *(int*)&byte[22];
     int bitDepth = *(int*)&byte[28];
-    // calculate the size of the image in pixels
     int size = height * width;
+
     // check if the image has a color table
     if(bitDepth <= 8) {
         // read, and then write the color table from the input file
         fread(colorTable, sizeof(unsigned char), 1024, fileIn);
         fwrite(colorTable, sizeof(unsigned char), 1024, fileOut);
     }
+
     // array to store the image data in chunks
     unsigned char buffer[CHUNK_SIZE];
+
     // read and write the image data in chunks until the end of the file is reached
     while(!feof(fileIn)) {
+
         // read a chunk of image data from the input file
         size_t bytesRead = fread(buffer, sizeof(unsigned char), CHUNK_SIZE, fileIn);
+
         // apply the threshold to each pixel in the chunk
         for(i = 0; i < bytesRead; i++) {
             buffer[i] = (buffer[i] > THRESHOLD)
@@ -48,9 +59,8 @@ int black_and_white_filter(inputFile, outputFile) {
         // write the thresholded image data to the output file
         fwrite(buffer, sizeof(unsigned char), bytesRead, fileOut);
     }
-    // close the input and output files
-    fClose(fileIn);
+
+    fclose(fileIn);
     fclose(fileOut);
-    // exit
     return 0;
 }
diff --git a/C_image_processing/filters/bright_filter.c b/C_image_processing/filters/bright_filter.c
@@ -0,0 +1,72 @@
+#include <stdio.h>
+#include <stdlib.h>
+#define MAX_COLOR 255
+#define BRIGHTNESS 25
+#define CHUNK_SIZE 1024 // define size of the chunks to read and write
+#define THRESHOLD 128   // define threshold value for the brightness condition
+
+int bright_filter(inputFile, outputFile) {
+
+    FILE *fileIn = fopen(inputFile, "rb");
+    FILE *fileOut = fopen(outputFile, "wb+");
+
+    if (fileIn == NULL || fileOut == NULL) {
+        printf("File does not exist.\n");
+        if (fileIn != NULL) fclose(fileIn);
+        if (fileOut != NULL) fclose(fileOut);
+        return 1;
+    }
+
+    int i;
+    unsigned char byte[54]; // store header info of image
+    unsigned char colorTable[1024]; // store color table of image
+
+    // read the header info of image
+    for(i = 0; i < 54; i++) {
+        byte[i] = getc(fileIn);
+    }
+
+    // write header info to output file
+    fwrite(byte, sizeof(unsigned char), 54, fileOut);
+
+    // extract height, width and bitDepth of image from header info
+    int height = *(int*)&byte[18];
+    int width = *(int*)&byte[22];
+    int bitDepth = *(int*)&byte[28];
+
+    // calculate size of image in pixels
+    int size = height * width;
+
+    // check if image has a color table
+    if(bitDepth <= 8) {
+        // read, then write color table from the input file
+        fread(colorTable, sizeof(unsigned char), 1024, fileIn);
+        fwrite(colorTable, sizeof(unsigned char), 1024, fileOut);
+    }
+
+    // array to store image data in chunks
+    unsigned char buffer[CHUNK_SIZE];
+
+    // read & write image data in chunks until the end of file is reached
+    while(!feof(fileIn)) {
+
+        // read a chunk of image data from input file
+        size_t bytesRead = fread(buffer, sizeof(unsigned char), CHUNK_SIZE, fileIn);
+
+        // apply brightness factor to each pixel in the chunk
+        for (i = 0; i < bytesRead; i++) {
+            buffer[i] = buffer[i] + BRIGHTNESS;
+            buffer[i] = (buffer[i] > THRESHOLD) ? MAX_COLOR : buffer[i];
+        }
+
+        // write thresholded image data to the output file
+        fwrite(buffer, sizeof(unsigned char), bytesRead, fileOut);
+    }
+
+    // write thresholded image data to the output file
+    fwrite(buffer, sizeof(unsigned char), size, fileOut);
+
+    fClose(fileIn);
+    fclose(fileOut);
+    return 0;
+}
diff --git a/C_image_processing/filters/dark_filter.c b/C_image_processing/filters/dark_filter.c
@@ -0,0 +1,69 @@
+#include <stdio.h>
+#define MAX_COLOR 255
+#define THRESHOLD 40 // define threshold value for darkness
+#define CHUNK_SIZE 1024 // define size of chunks to read and write
+
+int dark_filter(inputFile, outputFile) {
+
+    FILE *fileIn = fopen(inputFile, "rb");
+    FILE *fileOut = fopen(outputFile, "wb+");
+
+    if (fileIn == NULL || fileOut == NULL) {
+        printf("File does not exist.\n");
+        if (fileIn != NULL) fclose(fileIn);
+        if (fileOut != NULL) fclose(fileOut);
+        return 1;
+    }
+
+    int i;
+    unsigned char byte[54]; // store header info of image
+    unsigned char colorTable[1024]; // store color table of image
+
+    // read header information of image
+    for(i = 0; i < 54; i++) {
+        byte[i] = getc(fileIn);
+    }
+
+    // write header info to output file
+    fwrite(byte, sizeof(unsigned char), 54, fileOut);
+
+    // extract height, width and bitDepth of the image from header information
+    int height = *(int*)&byte[18];
+    int width = *(int*)&byte[22];
+    int bitDepth = *(int*)&byte[28];
+
+    // calculate size of image in pixels
+    int size = height * width;
+
+    // check if image has a color table
+    if(bitDepth <= 8) {
+        // read, then write the color table from input file
+        fread(colorTable, sizeof(unsigned char), 1024, fileIn);
+        fwrite(colorTable, sizeof(unsigned char), 1024, fileOut);
+    }
+
+    // array to store image data in chunks
+    unsigned char buffer[CHUNK_SIZE];
+
+    // read & write image data in chunks until end of the file reached
+    while(!feof(fileIn)) {
+
+        // read a chunk of image data from input file
+        size_t bytesRead = fread(buffer, sizeof(unsigned char), CHUNK_SIZE, fileIn);
+
+        // apply darkness threshold to each pixel in chunk
+        for (i = 0; i < bytesRead; i++) {
+            buffer[i] = buffer[i] + THRESHOLD;
+            buffer[i] = (buffer[i] > THRESHOLD) ? MAX_COLOR : buffer[i];
+        }
+        // write thresholded image data to the output file
+        fwrite(buffer, sizeof(unsigned char), bytesRead, fileOut);
+    }
+
+    // write thresholded image data to the output file
+    fwrite(buffer, sizeof(unsigned char), size, fileOut);
+
+    fClose(fileIn);
+    fclose(fileOut);
+    return 0;
+}