Lecture bmp of C language
13
Bitmap Image. Embedded System Engineering
description
BMP lecture of C language
Transcript of Lecture bmp of C language
Bitmap Image.
Embedded System Engineer-ing
Bitmap Image : Bitmap Structure
File Header
Info Header
Opt. Palette
Image Data
BITMAPFILEHEADER
BITMAPINFOHEADER
RGBQUAD[n]
RGBTRIPLE[m]
Bitmap Image : File Header
File Header
Info Header
Opt. Palette
Image Data
14
40
4n
3m
BMRESERVED
Bitmap Image : Info Header
File Header
Info Header
Opt. Palette
Image Data
40
Width
Height
Bitmap Image : Image Data
Bitmap : Bitmap - Reading
File Header
Info Header
Image Data
#include <windows.h>
FILE *fp;BITMAPFILEHEADER bh;BITMAPINFOHEADER ih;RGBTRIPLE pixel;int i = 0;
if(!(fp = fopen("lena.bmp", "rb"))) return 0;
fread(&bh, sizeof(BITMAPFILEHEADER), 1, fp);fread(&ih, sizeof(BITMAPINFOHEADER), 1, fp);while(fread(&pixel, sizeof(RGBTRIPLE), 1, fp)){
printf("pixel #%5d: %02x %02x %02x\n", i++, pixel.rgbtBlue, pixel.rgbtGreen, pix-el.rgbtRed);}
printf("%d pixels read.\n", i);
Starting point!
Bitmap : Bitmap – Writing
File Header
Info Header
Image Data
FILE *fp;BITMAPFILEHEADER bh;BITMAPINFOHEADER ih;char pixel[60*30*3];int i;
for( i = 0 ; i < 60 * 30 * 3 ; i+=3 ){
// bluepixel[i] = 0xff;// greenpixel[i+1] = 0x00;// redpixel[i+2] = 0x00;
}
ih.biSize = sizeof(BITMAPINFOHEADER);ih.biWidth = 60;ih.biHeight = 30;ih.biPlanes = 1;ih.biBitCount = 24;ih.biCompression = 0;ih.biSizeImage = sizeof(pixel);ih.biXPelsPerMeter = ih.biYPelsPerMeter = 0;ih.biClrImportant = ih.biClrUsed = 0;
bh.bfType = 0x4d42;bh.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER) + sizeof(pixel);bh.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER);
if(!(fp = fopen("blue.bmp", "wb"))) return 0;
fwrite(&bh, sizeof(BITMAPFILEHEADER), 1, fp);fwrite(&ih, sizeof(BITMAPINFOHEADER), 1, fp);fwrite(&pixel, sizeof(pixel), 1, fp);
30
60
Bitmap : Practice #1
Inverting
Hint :: Each pixel data(R,G,B) ^ 0xff
Bitmap : Practice #2
Hint :: Red * 0.299, Green * 0.587, Blue * 0.114
Sepia effect
Bitmap : Practice #3
Draw the flag of NETHERLANDSize : 600 x 300
Bitmap : Practice #4
Draw the flag of FRANCESize : 600 x 300
Bitmap : Practice #5
In this square, there are some black pixels, how many pixels are there?And, where is location of pixels?
Bitmap : Practice #6
Rotation
