Im Searching For Computer Vision A Modern Approach PDF?

Im Searching For Computer Vision A Modern Approach PDF?

Online Pdf Editing . Every image format has it's own signature track. File header, Info header, RGB triple structure. Those are header files. Whether it's a BMP, JPEG, GIF or else. First of all you need to wrap your head around about what reading from a file means and how it's implemented, which yields the usage of FILE I/O library of your programming language of interest. Open the a resource of that specific FILE I/O lib and see what can be used and do some short examples,every language is different at that domain. If C is your language of choice, this is a code which makes copy of BMP file using command line arguments. It's really very broad subject, you have to do a research of your own! Hope this copy.c will shed a light, it's part of Digital Forensics project at Haravrd University. /** * copy.c * * Copies a BMP piece by piece, just because. */ #include #include #include "bmp.h" // this the bmp.h header file int main(int argc, char* argv[]) { // ensure proper usage if (argc != 3) { printf("Usage. ./copy infile outfile\n"); return 1; } // remember filenames char* infile = argv[1]; char* outfile = argv[2]; // open input file FILE* inptr = fopen(infile, "r"); if (inptr == NULL) { printf("Could not open %s.\n", infile); return 2; } // open output file FILE* outptr = fopen(outfile, "w"); if (outptr == NULL) { fclose(inptr); fprintf(stderr, "Could not create %s.\n", outfile); return 3; } // read infile's BITMAPFILEHEADER BITMAPFILEHEADER bf; fread(&bf, sizeof(BITMAPFILEHEADER), 1, inptr); // read infile's BITMAPINFOHEADER BITMAPINFOHEADER bi; fread(&bi, sizeof(BITMAPINFOHEADER), 1, inptr); // ensure infile is (likely) a 24-bit uncompressed BMP 4.0 if (bf.bfType != 0x4d42 || bf.bfOffBits != 54 || bi.biSize != 40 || bi.biBitCount != 24 || bi.biCompression != 0) { fclose(outptr); fclose(inptr); fprintf(stderr, "Unsupported file format.\n"); return 4; } // write outfile's BITMAPFILEHEADER fwrite(&bf, sizeof(BITMAPFILEHEADER), 1, outptr); // write outfile's BITMAPINFOHEADER fwrite(&bi, sizeof(BITMAPINFOHEADER), 1, outptr); // determine padding for scanlines int padding = (4 - (bi.biWidth * sizeof(RGBTRIPLE)) % 4) % 4; // iterate over infile's scanlines for (int i = 0, biHeight = abs(bi.biHeight); i < biHeight; i++) { // iterate over pixels in scanline for (int j = 0; j < bi.biWidth; j++) { // temporary storage RGBTRIPLE triple; // read RGB triple from infile fread(&triple, sizeof(RGBTRIPLE), 1, inptr); // write RGB triple to outfile fwrite(&triple, sizeof(RGBTRIPLE), 1, outptr); } // skip over padding, if any fseek(inptr, padding, SEEK_CUR); // then add it back (to demonstrate how) for (int k = 0; k < padding; k++) { fputc(0x00, outptr); } } // close infile fclose(inptr); // close outfile fclose(outptr); // that's all folks return 0; } The BMP.h file /* * BMP-related data types based on Microsoft's own. */ #include /** * Common Data Types * * The data types in this section are essentially aliases for C/C++ * primitive data types. * * Adapted from 2.2 Common Data Types. * See C data types for more on stdint.h. */ typedef uint8_t BYTE; typedef uint32_t DWORD; typedef int32_t LONG; typedef uint16_t WORD; /** * BITMAPFILEHEADER * * The BITMAPFILEHEADER structure contains information about the type, size, * and layout of a file that contains a DIB [device-independent bitmap]. * * Adapted from BITMAPFILEHEADER structure. */ typedef struct { WORD bfType; DWORD bfSize; WORD bfReserved1; WORD bfReserved2; DWORD bfOffBits; } __attribute__((__packed__)) BITMAPFILEHEADER; /** * BITMAPINFOHEADER * * The BITMAPINFOHEADER structure contains information about the * dimensions and color format of a DIB [device-independent bitmap]. * * Adapted from BITMAPINFOHEADER structure. */ typedef struct { DWORD biSize; LONG biWidth; LONG biHeight; WORD biPlanes; WORD biBitCount; DWORD biCompression; DWORD biSizeImage; LONG biXPelsPerMeter; LONG biYPelsPerMeter; DWORD biClrUsed; DWORD biClrImportant; } __attribute__((__packed__)) BITMAPINFOHEADER; /** * RGBTRIPLE * * This structure describes a color consisting of relative intensities of * red, green, and blue. * * Adapted from RGBTRIPLE. */ typedef struct { BYTE rgbtBlue; BYTE rgbtGreen; BYTE rgbtRed; } __attribute__((__packed__)) RGBTRIPLE;