Bitmap file 분석OpenCV/미분류2009. 8. 14. 20:29
Table of Contents
반응형
25 x 25 크기의 흰색으로 가득 채운 비트맵 이미지를 사용하여 분석한 결과..
비트맵 이미지를 hex로 변환하면 일정한 규칙이 있는 것을 발견 할 수 있음
참고 : http://en.wikipedia.org/wiki/BMP_file_format
42 4D 2 bytes(0)
B M the magic number used to identify the BMP file
A2 07 00 00 4 bytes(2)
0x07A2 = 1954 bytes the size of the BMP file in bytes
00 00 2 bytes(6)
reserved; actual value depends on the application that creates the image
00 00 2 bytes(8)
reserved; actual value depends on the application that creates the image
36 00 00 00 4 bytes(10)
0x36 = 54 bytes the offset, i.e. starting address, of the byte where the bitmap data can be found
28 00 00 00 4 bytes (14)
0x28 = 40 bytes the size of this header
19 00 00 00 4 bytes (18)
0x19 = 25 the bitmap width in pixels (signed integer)
19 00 00 00 4 bytes (22)
0x19 = 25 the bitmap height in pixels (signed integer)
01 00 2 bytes (26)
the number of color planes being used. Must be set to 1
18 00 2 bytes (28)
0x18 = 24 the number of bits per pixel, which is the color depth of the image. Typical values are 1, 4, 8, 16, 24 and 32
00 00 00 00
0 BI_RGB the compression method being used
0 BI_RGB none Most common
1 BI_RLE8 RLE 8-bit/pixel Can be used only with 8-bit/pixel bitmaps
2 BI_RLE4 RLE 4-bit/pixel Can be used only with 4-bit/pixel bitmaps
3 BI_BITFIELDS Bit field Can be used only with 16 and 32-bit/pixel bitmaps.
4 BI_JPEG JPEG The bitmap contains a JPEG image
5 BI_PNG PNG The bitmap contains a PNG image
6C 07 00 00
0x076C = 1900 bytes the image size. This is the size of the raw bitmap data
실제 사용되는 이미지의 크기는 25*25*3 = 1875 bytes 이므로 실제 보다 크게 사용 하는 것을 알 수 있다.
00 00 00 00
the horizontal resolution of the image. (pixel per meter, signed integer)
00 00 00 00
the vertical resolution of the image. (pixel per meter, signed integer)
00 00 00 00
the number of colors in the color palette, or 0 to default to 2n
00 00 00 00
the number of important colors used, or 0 when every color is important; generally ignored.
24비트 RGB 이미지에서 픽셀이 흰색일 경우 hex로는 0xFF 0xFF 0xFF로 표현된다.
이미지의 가로 길이가 25 픽셀이므로 한 줄에 대응되는 0xFF가 75개이다.
맨 끝에 00은 이미지 가로의 길이를 4의 배수로 맞추기 위함이다. (한 줄이 76개의 바이트 사용)
이미지의 세로의 길이가 25이므로 25번 반복되서 나타남..
00 00 00 00 00 00 36 00 00 00 28 00 00 00 19 00 00 00 19 00 00 00 01 00 18 00 00 00 00 00 6C 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF 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FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00
비트맵 이미지를 hex로 변환하면 일정한 규칙이 있는 것을 발견 할 수 있음
참고 : http://en.wikipedia.org/wiki/BMP_file_format
42 4D 2 bytes(0)
B M the magic number used to identify the BMP file
A2 07 00 00 4 bytes(2)
0x07A2 = 1954 bytes the size of the BMP file in bytes
 |
00 00 2 bytes(6)
reserved; actual value depends on the application that creates the image
00 00 2 bytes(8)
reserved; actual value depends on the application that creates the image
36 00 00 00 4 bytes(10)
0x36 = 54 bytes the offset, i.e. starting address, of the byte where the bitmap data can be found
28 00 00 00 4 bytes (14)
0x28 = 40 bytes the size of this header
19 00 00 00 4 bytes (18)
0x19 = 25 the bitmap width in pixels (signed integer)
19 00 00 00 4 bytes (22)
0x19 = 25 the bitmap height in pixels (signed integer)
01 00 2 bytes (26)
the number of color planes being used. Must be set to 1
18 00 2 bytes (28)
0x18 = 24 the number of bits per pixel, which is the color depth of the image. Typical values are 1, 4, 8, 16, 24 and 32
00 00 00 00
0 BI_RGB the compression method being used
0 BI_RGB none Most common
1 BI_RLE8 RLE 8-bit/pixel Can be used only with 8-bit/pixel bitmaps
2 BI_RLE4 RLE 4-bit/pixel Can be used only with 4-bit/pixel bitmaps
3 BI_BITFIELDS Bit field Can be used only with 16 and 32-bit/pixel bitmaps.
4 BI_JPEG JPEG The bitmap contains a JPEG image
5 BI_PNG PNG The bitmap contains a PNG image
6C 07 00 00
0x076C = 1900 bytes the image size. This is the size of the raw bitmap data
실제 사용되는 이미지의 크기는 25*25*3 = 1875 bytes 이므로 실제 보다 크게 사용 하는 것을 알 수 있다.
00 00 00 00
the horizontal resolution of the image. (pixel per meter, signed integer)
00 00 00 00
the vertical resolution of the image. (pixel per meter, signed integer)
00 00 00 00
the number of colors in the color palette, or 0 to default to 2n
00 00 00 00
the number of important colors used, or 0 when every color is important; generally ignored.
24비트 RGB 이미지에서 픽셀이 흰색일 경우 hex로는 0xFF 0xFF 0xFF로 표현된다.
이미지의 가로 길이가 25 픽셀이므로 한 줄에 대응되는 0xFF가 75개이다.
맨 끝에 00은 이미지 가로의 길이를 4의 배수로 맞추기 위함이다. (한 줄이 76개의 바이트 사용)
이미지의 세로의 길이가 25이므로 25번 반복되서 나타남..
00 00 00 00 00 00 36 00 00 00 28 00 00 00 19 00 00 00 19 00 00 00 01 00 18 00 00 00 00 00 6C 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 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FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF 00
반응형
'OpenCV > 미분류' 카테고리의 다른 글
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시간날때마다 틈틈이 이것저것 해보며 블로그에 글을 남깁니다.
블로그의 문서는 종종 최신 버전으로 업데이트됩니다.
여유 시간이 날때 진행하는 거라 언제 진행될지는 알 수 없습니다.
영화,책, 생각등을 올리는 블로그도 운영하고 있습니다.
https://freewriting2024.tistory.com
제가 쓴 책도 한번 검토해보세요 ^^
