1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/********************************
Author: Sravanthi Kota Venkata
********************************/
#include <stdio.h>
#include <stdlib.h>
#include "sdvbs_common.h"
I2D* readImage(const char* pathName)
{
// Reading BMP image
char signature[2];
int file_size;
short int reserved1;
short int reserved2;
int loc_of_bitmap;
int size_of_infoheader;
int width;
int height;
short int number_of_planes;
short int bits_per_pixel;
int compression_method;
int bytes_of_bitmap;
int hori_reso;
int vert_reso;
int no_of_colors;
int no_of_imp_colors;
int nI,nJ;
int pixSize;
unsigned char tempb,tempg,tempr,tempjunk[12];
int ta;
I2D* srcImage;
FILE *input;
input = fopen(pathName,"rb");
if(input == NULL)
{
perror("File pointer error");
return NULL;
}
else
{
//start of header information
fread(&signature,sizeof(signature),1,input);
fread(&file_size,sizeof(file_size),1,input);
fread(&reserved1,sizeof(reserved1),1,input);
fread(&reserved2,sizeof(reserved2),1,input);
fread(&loc_of_bitmap,sizeof(loc_of_bitmap),1,input);
fread(&size_of_infoheader,sizeof(size_of_infoheader),1,input);
fread(&width,sizeof(width),1,input); // Reads the width of the image
fread(&height,sizeof(height),1,input); // Reads the height of the image
fread(&number_of_planes,sizeof(number_of_planes),1,input);
fread(&bits_per_pixel,sizeof(bits_per_pixel),1,input);
fread(&compression_method,sizeof(compression_method),1,input);
fread(&bytes_of_bitmap,sizeof(bytes_of_bitmap),1,input);
fread(&hori_reso,sizeof(hori_reso),1,input);
fread(&vert_reso,sizeof(vert_reso),1,input);
fread(&no_of_colors,sizeof(no_of_colors),1,input);
fread(&no_of_imp_colors,sizeof(no_of_imp_colors),1,input);
//end of header information
srcImage = iMallocHandle(height, width);
// Conditions to check whether the BMP is interleaved and handling few exceptions
if(srcImage->height <= 0 || srcImage->width <= 0 || signature[0] != 'B' || signature[1] != 'M' || ( bits_per_pixel !=24 && bits_per_pixel !=8 ) )
{
printf("ERROR in BMP read: The input file is not in standard BMP format");
return NULL;
}
fseek(input,loc_of_bitmap,SEEK_SET);
if (bits_per_pixel == 8)
{
for(nI = (height - 1); nI >= 0 ; nI--)
{
for(nJ = 0;nJ < width; nJ++)
{
fread(&tempg,sizeof(unsigned char),1,input);
subsref(srcImage,nI,nJ) = (int)tempg;
}
}
}
else if (bits_per_pixel == 24)
{
for(nI = (height - 1); nI >= 0 ; nI--)
{
for(nJ = 0;nJ < width; nJ++)
{
fread(&tempb,sizeof(unsigned char),1,input);
fread(&tempg,sizeof(unsigned char),1,input);
fread(&tempr,sizeof(unsigned char),1,input);
ta = (3*tempr + 6*tempg + tempb)/10;
ta = tempg;
subsref(srcImage,nI,nJ) = (int)ta;
}
}
}
else
{
return NULL;
}
fclose(input);
return srcImage;
}
}
|
