【cs 50】lab4 & problemset4 -ing
（1）lab4-Smiley
helpers.c
#include "helpers.h" void colorize(int height, int width, RGBTRIPLE image[height][width]) { // Change all black pixels to a color of your choosing for(int i=0;i<height;++i){ for(int j=0;j<width;++j){ if(image[i][j].rgbtBlue==0x00 && image[i][j].rgbtGreen==0x00 && image[i][j].rgbtRed == 0x00){ image[i][j].rgbtRed = 0xff; } else{ continue; } } } }
（2）lab4-volume
// Modifies the volume of an audio file #include <stdint.h> #include <stdio.h> #include <stdlib.h> // Number of bytes in .wav header const int HEADER_SIZE = 44; int main(int argc, char *argv[]) { // Check command-line arguments if (argc != 4) { printf("Usage: ./volume input.wav output.wav factor\n"); return 1; } // Open files and determine scaling factor FILE *input = fopen(argv[1], "r"); if (input == NULL) { printf("Could not open file.\n"); return 1; } FILE *output = fopen(argv[2], "w"); if (output == NULL) { printf("Could not open file.\n"); return 1; } float factor = atof(argv[3]); // TODO: Copy header from input file to output file uint8_t header[HEADER_SIZE]; fread(&header,sizeof(uint8_t),HEADER_SIZE,input); fwrite(&header,sizeof(uint8_t),HEADER_SIZE,output); // TODO: Read samples from input file and write updated data to output file int16_t buffer; while(fread(&buffer,sizeof(int16_t),1,input)){ buffer *= factor; fwrite(&buffer,sizeof(int16_t),1,output); } // Close files fclose(input); fclose(output); }
（3）problemset 4 filter
#include "helpers.h" // Convert image to grayscale void grayscale(int height, int width, RGBTRIPLE image[height][width]) { BYTE gray; BYTE mid; for(int i=0;i<height;i++){ for(int j=0;j<width;j++){ mid = (image[i][j].rgbtBlue + image[i][j].rgbtGreen + image[i][j].rgbtRed)%0x03; if(mid < 1.5){ gray = (image[i][j].rgbtBlue + image[i][j].rgbtGreen + image[i][j].rgbtRed)/0x03; } else{ gray = (image[i][j].rgbtBlue + image[i][j].rgbtGreen + image[i][j].rgbtRed)/0x03+0x01; } image[i][j].rgbtBlue = image[i][j].rgbtGreen = image[i][j].rgbtRed = gray; } } return; } // Convert image to sepia void sepia(int height, int width, RGBTRIPLE image[height][width]) { float _sepiaRed; float _sepiaGreen; float _sepiaBlue; float mid; BYTE originalRed; BYTE originalGreen; BYTE originalBlue; BYTE sepiaRed; BYTE sepiaGreen; BYTE sepiaBlue; for(int i=0;i<height;i++){ for(int j=0;j<width;j++){ originalRed = image[i][j].rgbtRed; originalGreen = image[i][j].rgbtGreen; originalBlue = image[i][j].rgbtBlue; _sepiaRed = .393 * originalRed + .769 * originalGreen + .189 * originalBlue; _sepiaGreen = .349 * originalRed + .686 * originalGreen + .168 * originalBlue; _sepiaBlue = .272 * originalRed + .534 * originalGreen + .131 * originalBlue; if(_sepiaRed>255) _sepiaRed = 255; if(_sepiaGreen>255) _sepiaGreen = 255; if(_sepiaBlue>255) _sepiaBlue = 255; mid = _sepiaRed - (int)_sepiaRed; if(mid<0.5){ sepiaRed = _sepiaRed; }else{ sepiaRed = _sepiaRed+1; } mid = _sepiaGreen - (int)_sepiaGreen; if(mid<0.5){ sepiaGreen = _sepiaGreen; }else{ sepiaGreen = _sepiaGreen+1; } mid = _sepiaBlue - (int)_sepiaBlue; if(mid < 0.5){ sepiaBlue = _sepiaBlue; }else{ sepiaBlue = _sepiaBlue+1; } image[i][j].rgbtRed = sepiaRed; image[i][j].rgbtGreen = sepiaGreen; image[i][j].rgbtBlue = sepiaBlue; } } return; } // Reflect image horizontally void reflect(int height, int width, RGBTRIPLE image[height][width]) { int mirror = width-1; RGBTRIPLE temp; for(int i=0;i<height;i++){ for(int j=0;j<width/2;j++){ temp = image[i][j]; image[i][j] = image[i][mirror-j]; image[i][mirror-j] = temp; } } return; } // Blur image void blur(int height, int width, RGBTRIPLE image[height][width]) { RGBTRIPLE temp[height][width]; BYTE upRed,upGreen,upBlue; BYTE downRed,downGreen,downBlue; BYTE leftRed,leftGreen,leftBlue; BYTE rightRed,rightGreen,rightBlue; BYTE upLeftRed,upLeftGreen,upLeftBlue; BYTE upRightRed,upRightGreen,upRightBlue; BYTE downLeftRed,downLeftGreen,downLeftBlue; BYTE downRightRed,downRightGreen,downRightBlue; BYTE originalRed;BYTE originalGreen;BYTE originalBlue; float blurRed;float blurGreen;float blurBlue; BYTE Red;BYTE Blue;BYTE Green; int up,down,left,right; float count = 9.0; float mid = 0.0; for(int i=1;i<height-1;i++){ for(int j=1;j<width-1;j++){ up = i-1;down = i+1;left = j-1;right = j+1; upRed = image[up][j].rgbtRed;upGreen = image[up][j].rgbtGreen;upBlue = image[up][j].rgbtBlue; downRed = image[down][j].rgbtRed;downGreen = image[down][j].rgbtGreen;downBlue = image[down][j].rgbtBlue; leftRed = image[i][left].rgbtRed;leftGreen = image[i][left].rgbtGreen;leftBlue = image[i][left].rgbtBlue; rightRed = image[i][right].rgbtRed;rightGreen = image[i][right].rgbtGreen;rightBlue = image[i][right].rgbtBlue; upLeftRed = image[up][left].rgbtRed;upLeftGreen = image[up][left].rgbtGreen;upLeftBlue = image[up][left].rgbtBlue; upRightRed = image[up][right].rgbtRed;upRightGreen = image[up][right].rgbtGreen;upRightBlue = image[up][right].rgbtBlue; downLeftRed = image[down][left].rgbtRed;downLeftGreen = image[down][left].rgbtGreen;downLeftBlue = image[down][left].rgbtBlue; downRightRed = image[down][right].rgbtRed;downRightGreen = image[down][right].rgbtGreen;downRightBlue = image[down][right].rgbtBlue; originalRed = image[i][j].rgbtRed; originalGreen = image[i][j].rgbtGreen; originalBlue = image[i][j].rgbtBlue; blurRed = (upRed + downRed + rightRed + leftRed + upLeftRed + upRightRed + downLeftRed+ downRightRed + originalRed)/count; blurGreen = (upGreen + downGreen + rightGreen + leftGreen + upLeftGreen + upRightGreen + downLeftGreen+ downRightGreen + originalGreen)/count; blurBlue = (upBlue + downBlue + rightBlue + leftBlue + upLeftBlue + upRightBlue + downLeftBlue+ downRightBlue + originalBlue)/count; mid = blurRed - (int)blurRed; if(mid>=0.5){Red = blurRed + 1;} else{Red = blurRed;} mid = blurGreen - (int)blurGreen; if(mid>=0.5){Green = blurGreen + 1;} else{ Green = blurGreen;} mid = blurBlue - (int)blurBlue; if(mid>=0.5){Blue = blurBlue + 1;} else{Blue = blurBlue;} temp[i][j].rgbtRed = Red; temp[i][j].rgbtGreen = Green; temp[i][j].rgbtBlue = Blue; } } count = 6.0; for(int j=1;j<width-1;j++){ down = 1;left = j-1;right = j+1; downRed = image[down][j].rgbtRed;downGreen = image[down][j].rgbtGreen;downBlue = image[down][j].rgbtBlue; leftRed = image[0][left].rgbtRed;leftGreen = image[0][left].rgbtGreen;leftBlue = image[0][left].rgbtBlue; rightRed = image[0][right].rgbtRed;rightGreen = image[0][right].rgbtGreen;rightBlue = image[0][right].rgbtBlue; downLeftRed = image[down][left].rgbtRed;downLeftGreen = image[down][left].rgbtGreen;downLeftBlue = image[down][left].rgbtBlue; downRightRed = image[down][right].rgbtRed;downRightGreen = image[down][right].rgbtGreen;downRightBlue = image[down][right].rgbtBlue; originalRed = image[0][j].rgbtRed; originalGreen = image[0][j].rgbtGreen; originalBlue = image[0][j].rgbtBlue; blurRed = (downRed + rightRed + leftRed + downLeftRed+ downRightRed + originalRed)/count; blurGreen = (downGreen + rightGreen + leftGreen + downLeftGreen+ downRightGreen + originalGreen)/count; blurBlue = (downBlue + rightBlue + leftBlue + downLeftBlue+ downRightBlue + originalBlue)/count; mid = blurRed - (int)blurRed; if(mid>=0.5){Red = blurRed + 1;} else{Red = blurRed;} mid = blurGreen - (int)blurGreen; if(mid>=0.5){Green = blurGreen + 1;} else{ Green = blurGreen;} mid = blurBlue - (int)blurBlue; if(mid>=0.5){Blue = blurBlue + 1;} else{Blue = blurBlue;} temp[0][j].rgbtRed = Red; temp[0][j].rgbtGreen = Green; temp[0][j].rgbtBlue = Blue; } for(int j=1;j<width-1;j++){ up = height-2;left = j-1;right = j+1; upRed = image[up][j].rgbtRed;upGreen = image[up][j].rgbtGreen;upBlue = image[up][j].rgbtBlue; leftRed = image[height-1][left].rgbtRed;leftGreen = image[height-1][left].rgbtGreen;leftBlue = image[height-1][left].rgbtBlue; rightRed = image[height-1][right].rgbtRed;rightGreen = image[height-1][right].rgbtGreen;rightBlue = image[height-1][right].rgbtBlue; upLeftRed = image[up][left].rgbtRed;upLeftGreen = image[up][left].rgbtGreen;upLeftBlue = image[up][left].rgbtBlue; upRightRed = image[up][right].rgbtRed;upRightGreen = image[up][right].rgbtGreen;upRightBlue = image[up][right].rgbtBlue; originalRed = image[height-1][j].rgbtRed; originalGreen = image[height-1][j].rgbtGreen; originalBlue = image[height-1][j].rgbtBlue; blurRed = (upRed + rightRed + leftRed + upLeftRed + upRightRed + originalRed)/count; blurGreen = (upGreen + rightGreen + leftGreen + upLeftGreen + upRightGreen + originalGreen)/count; blurBlue = (upBlue + rightBlue + leftBlue + upLeftBlue + upRightBlue + originalBlue)/count; mid = blurRed - (int)blurRed; if(mid>=0.5){Red = blurRed + 1;} else{Red = blurRed;} mid = blurGreen - (int)blurGreen; if(mid>=0.5){Green = blurGreen + 1;} else{ Green = blurGreen;} mid = blurBlue - (int)blurBlue; if(mid>=0.5){Blue = blurBlue + 1;} else{Blue = blurBlue;} temp[height-1][j].rgbtRed = Red; temp[height-1][j].rgbtGreen = Green; temp[height-1][j].rgbtBlue = Blue; } for(int i=1;i<height-1;i++){ up = i-1;down = i+1;right = 1; upRed = image[up][0].rgbtRed;upGreen = image[up][0].rgbtGreen;upBlue = image[up][0].rgbtBlue; downRed = image[down][0].rgbtRed;downGreen = image[down][0].rgbtGreen;downBlue = image[down][0].rgbtBlue; rightRed = image[i][right].rgbtRed;rightGreen = image[i][right].rgbtGreen;rightBlue = image[i][right].rgbtBlue; upRightRed = image[up][right].rgbtRed;upRightGreen = image[up][right].rgbtGreen;upRightBlue = image[up][right].rgbtBlue; downRightRed = image[down][right].rgbtRed;downRightGreen = image[down][right].rgbtGreen;downRightBlue = image[down][right].rgbtBlue; originalRed = image[i][0].rgbtRed; originalGreen = image[i][0].rgbtGreen; originalBlue = image[i][0].rgbtBlue; blurRed = (upRed + downRed + rightRed + upRightRed + downRightRed + originalRed)/count; blurGreen = (upGreen + downGreen + rightGreen + upRightGreen + downRightGreen + originalGreen)/count; blurBlue = (upBlue + downBlue + rightBlue + upRightBlue + downRightBlue + originalBlue)/count; mid = blurRed - (int)blurRed; if(mid>=0.5){Red = blurRed + 1;} else{Red = blurRed;} mid = blurGreen - (int)blurGreen; if(mid>=0.5){Green = blurGreen + 1;} else{ Green = blurGreen;} mid = blurBlue - (int)blurBlue; if(mid>=0.5){Blue = blurBlue + 1;} else{Blue = blurBlue;} temp[i][0].rgbtRed = Red; temp[i][0].rgbtGreen = Green; temp[i][0].rgbtBlue = Blue; } for(int i=1;i<height-1;++i){ up = i-1;down = i+1;left = width - 2; upRed = image[up][width - 1].rgbtRed;upGreen = image[up][width - 1].rgbtGreen;upBlue = image[up][width - 1].rgbtBlue; downRed = image[down][width - 1].rgbtRed;downGreen = image[down][width - 1].rgbtGreen;downBlue = image[down][width - 1].rgbtBlue; leftRed = image[i][left].rgbtRed;leftGreen = image[i][left].rgbtGreen;leftBlue = image[i][left].rgbtBlue; upLeftRed = image[up][left].rgbtRed;upLeftGreen = image[up][left].rgbtGreen;upLeftBlue = image[up][left].rgbtBlue; downLeftRed = image[down][left].rgbtRed;downLeftGreen = image[down][left].rgbtGreen;downLeftBlue = image[down][left].rgbtBlue; originalRed = image[i][width - 1].rgbtRed; originalGreen = image[i][width - 1].rgbtGreen; originalBlue = image[i][width - 1].rgbtBlue; blurRed = (upRed + downRed + leftRed + upLeftRed + downLeftRed+ originalRed)/count; blurGreen = (upGreen + downGreen + leftGreen + upLeftGreen + downLeftGreen + originalGreen)/count; blurBlue = (upBlue + downBlue + leftBlue + upLeftBlue + downLeftBlue + originalBlue)/count; mid = blurRed - (int)blurRed; if(mid>=0.5){Red = blurRed + 1;} else{Red = blurRed;} mid = blurGreen - (int)blurGreen; if(mid>=0.5){Green = blurGreen + 1;} else{ Green = blurGreen;} mid = blurBlue - (int)blurBlue; if(mid>=0.5){Blue = blurBlue + 1;} else{Blue = blurBlue;} temp[i][width - 1].rgbtRed = Red; temp[i][width - 1].rgbtGreen = Green; temp[i][width - 1].rgbtBlue = Blue; } count = 4.0; blurRed = (image[0][0].rgbtRed+image[0][1].rgbtRed+image[1][0].rgbtRed+image[1][1].rgbtRed)/count; blurGreen = (image[0][0].rgbtGreen+image[0][1].rgbtGreen+image[1][0].rgbtGreen+image[1][1].rgbtGreen)/count; blurBlue = (image[0][0].rgbtBlue+image[0][1].rgbtBlue+image[1][0].rgbtBlue+image[1][1].rgbtBlue)/count; mid = blurRed - (int)blurRed; if(mid>=0.5){Red = blurRed + 1;} else{Red = blurRed;} mid = blurGreen - (int)blurGreen; if(mid>=0.5){Green = blurGreen + 1;} else{ Green = blurGreen;} mid = blurBlue - (int)blurBlue; if(mid>=0.5){Blue = blurBlue + 1;} else{Blue = blurBlue;} temp[0][0].rgbtRed = Red; temp[0][0].rgbtGreen = Green; temp[0][0].rgbtBlue = Blue; blurRed =(image[0][width-1].rgbtRed+image[0][width-2].rgbtRed+image[1][width-1].rgbtRed+image[1][width-2].rgbtRed)/count; blurGreen =(image[0][width-1].rgbtGreen+image[0][width-2].rgbtGreen+image[1][width-1].rgbtGreen+image[1][width-2].rgbtGreen)/count; blurBlue =(image[0][width-1].rgbtBlue+image[0][width-2].rgbtBlue+image[1][width-1].rgbtBlue+image[1][width-2].rgbtBlue)/count; mid = blurRed - (int)blurRed; if(mid>=0.5){Red = blurRed + 1;} else{Red = blurRed;} mid = blurGreen - (int)blurGreen; if(mid>=0.5){Green = blurGreen + 1;} else{ Green = blurGreen;} mid = blurBlue - (int)blurBlue; if(mid>=0.5){Blue = blurBlue + 1;} else{Blue = blurBlue;} temp[0][width-1].rgbtRed =Red ; temp[0][width-1].rgbtGreen = Green ; temp[0][width-1].rgbtBlue = Blue; blurRed =(image[height-1][0].rgbtRed+image[height-1][1].rgbtRed+image[height-2][0].rgbtRed+image[height-2][1].rgbtRed)/count; blurGreen =(image[height-1][0].rgbtGreen+image[height-1][1].rgbtGreen+image[height-2][0].rgbtGreen+image[height-2][1].rgbtGreen)/count; blurBlue = (image[height-1][0].rgbtBlue+image[height-1][1].rgbtBlue+image[height-2][0].rgbtBlue+image[height-2][1].rgbtBlue)/count; mid = blurRed - (int)blurRed; if(mid>=0.5){Red = blurRed + 1;} else{Red = blurRed;} mid = blurGreen - (int)blurGreen; if(mid>=0.5){Green = blurGreen + 1;} else{ Green = blurGreen;} mid = blurBlue - (int)blurBlue; if(mid>=0.5){Blue = blurBlue + 1;} else{Blue = blurBlue;} temp[height-1][0].rgbtRed = Red; temp[height-1][0].rgbtGreen = Green; temp[height-1][0].rgbtBlue =Blue; blurRed =(image[height-1][width-1].rgbtRed+image[height-1][width-2].rgbtRed+image[height-2][width-1].rgbtRed+image[height-2][width-2].rgbtRed)/count; blurGreen =(image[height-1][width-1].rgbtGreen+image[height-1][width-2].rgbtGreen+image[height-2][width-1].rgbtGreen+image[height-2][width-2].rgbtGreen)/count; blurBlue = (image[height-1][width-1].rgbtBlue+image[height-1][width-2].rgbtBlue+image[height-2][width-1].rgbtBlue+image[height-2][width-2].rgbtBlue)/count; mid = blurRed - (int)blurRed; if(mid>=0.5){Red = blurRed + 1;} else{Red = blurRed;} mid = blurGreen - (int)blurGreen; if(mid>=0.5){Green = blurGreen + 1;} else{ Green = blurGreen;} mid = blurBlue - (int)blurBlue; if(mid>=0.5){Blue = blurBlue + 1;} else{Blue = blurBlue;} temp[height-1][width-1].rgbtRed =Red ; temp[height-1][width-1].rgbtGreen = Green ; temp[height-1][width-1].rgbtBlue =Blue; for(int i=0;i<height;++i){ for(int j=0;j<width;++j){ image[i][j].rgbtRed = temp[i][j].rgbtRed; image[i][j].rgbtGreen = temp[i][j].rgbtGreen; image[i][j].rgbtBlue = temp[i][j].rgbtBlue; } } return; }
(4)problemSet-recover
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdint.h> typedef uint8_t BYTE; const int BLOCK_SIZE = 512; int main(int argc, char *argv[]) { if(argc != 2){ return 1; } FILE *raw_file = fopen(argv[1],"r"); if(raw_file == NULL){ return 1; } BYTE buffer[BLOCK_SIZE]; char filename[BLOCK_SIZE]; int count = 0; FILE *img = NULL; while(fread(buffer,1,BLOCK_SIZE,raw_file) == BLOCK_SIZE){ if((buffer[0] == 0xff) && (buffer[1] == 0xd8) && (buffer[2] == 0xff) && ((buffer[3] & 0xf0 ) == 0xe0)){ if(img!=NULL){ fclose(img); } sprintf(filename,"%03i.jpg",count); img = fopen(filename,"w"); fwrite(buffer,sizeof(BYTE),BLOCK_SIZE,img); count ++; } else{ if(img!=NULL){ fwrite(buffer,sizeof(BYTE),BLOCK_SIZE,img); } } } fclose(raw_file); fclose(img); }
