1.5w+
社区成员
为什么位图像素数据的字节数biSizeImage求出为0
CFileDialog opendialog(true,NULL, NULL,OFN_HIDEREADONLY ,"bmp file(*.bmp)|*.bmp|jpeg file(*.jpg)|*.jpg|All Files (*.*)|*.*||",
this);
HANDLE hfile;
BITMAPINFOHEADER bih;
BITMAPFILEHEADER bfh;
DWORD dwread;
LPCTSTR lpstr;
CString filename;CString str;
if(opendialog.DoModal()==IDOK)
{
filename=opendialog.GetPathName();//full cstring object include path and filename;
lpstr=LPCTSTR(filename);
if((hfile=CreateFile(lpstr,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL|FILE_FLAG_SEQUENTIAL_SCAN,NULL))!=NULL)
{
ReadFile(hfile,&bfh,sizeof(BITMAPFILEHEADER),&dwread,NULL);
ReadFile(hfile,&bih,sizeof(BITMAPINFOHEADER),&dwread,NULL); // is ok also;
str.Format("%d and %x and %d",bih.biSizeImage,bfh.bfType,bfh.bfSize);
AfxMessageBox(str,MB_OK,0);
}
this);
HANDLE hfile;
BITMAPINFOHEADER bih;
BITMAPFILEHEADER bfh;
DWORD dwread;
LPCTSTR lpstr;
CString filename;CString str;
if(opendialog.DoModal()==IDOK)
{
filename=opendialog.GetPathName();//full cstring object include path and filename;
lpstr=LPCTSTR(filename);
if((hfile=CreateFile(lpstr,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL|FILE_FLAG_SEQUENTIAL_SCAN,NULL))!=NULL)
{
ReadFile(hfile,&bfh,sizeof(BITMAPFILEHEADER),&dwread,NULL);
ReadFile(hfile,&bih,sizeof(BITMAPINFOHEADER),&dwread,NULL); // is ok also;
str.Format("%d and %x and %d",bih.biSizeImage,bfh.bfType,bfh.bfSize);
AfxMessageBox(str,MB_OK,0);
}
...全文
当前发帖距今超过3年，不再开放新的回复
发表回复
finix 2001-08-04
如果图象没有经过压缩，BITMAPINFOHEADER->biCompression=BI_RGB,then biSizeImage=0
mygoodday 2001-08-04
这么多的英文，说实在的阵脚人难以看懂，是否有中文的MSDN呢？？
pzp 2001-08-03
但我调试时从变量窗口中得到biCommpression为0x00000000,说明并没有压缩。
tiongkohlang 2001-08-03
以下摘自msdn
Platform SDK: Windows GDI
BITMAPINFOHEADER
The BITMAPINFOHEADER structure contains information about the dimensions and color format of a DIB.
Applications developed for Windows NT 4.0 and Windows 95 may use the BITMAPV4HEADER structure. Applications developed for Windows 2000 and Windows 98 may use the BITMAPV5HEADER structure for increased functionality. However, these are used only in the CreateDIBitmap function.
typedef struct tagBITMAPINFOHEADER{
DWORD biSize;
LONG biWidth;
LONG biHeight;
WORD biPlanes;
WORD biBitCount;
DWORD biCompression;
DWORD biSizeImage;
LONG biXPelsPerMeter;
LONG biYPelsPerMeter;
DWORD biClrUsed;
DWORD biClrImportant;
} BITMAPINFOHEADER, *PBITMAPINFOHEADER;
Members
biSize
Specifies the number of bytes required by the structure.
biWidth
Specifies the width of the bitmap, in pixels.
Windows 98, Windows 2000: If biCompression is BI_JPEG or BI_PNG, the biWidth member specifies the width of the decompressed JPEG or PNG image file, respectively.
biHeight
Specifies the height of the bitmap, in pixels. If biHeight is positive, the bitmap is a bottom-up DIB and its origin is the lower-left corner. If biHeight is negative, the bitmap is a top-down DIB and its origin is the upper-left corner.
If biHeight is negative, indicating a top-down DIB, biCompression must be either BI_RGB or BI_BITFIELDS. Top-down DIBs cannot be compressed.
Windows 98, Windows 2000: If biCompression is BI_JPEG or BI_PNG, the biHeight member specifies the height of the decompressed JPEG or PNG image file, respectively.
biPlanes
Specifies the number of planes for the target device. This value must be set to 1.
biBitCount
Specifies the number of bits-per-pixel. The biBitCount member of the BITMAPINFOHEADER structure determines the number of bits that define each pixel and the maximum number of colors in the bitmap. This member must be one of the following values. Value Meaning
0 Windows 98, Windows 2000: The number of bits-per-pixel is specified or is implied by the JPEG or PNG format.
1 The bitmap is monochrome, and the bmiColors member of BITMAPINFO contains two entries. Each bit in the bitmap array represents a pixel. If the bit is clear, the pixel is displayed with the color of the first entry in the bmiColors table; if the bit is set, the pixel has the color of the second entry in the table.
4 The bitmap has a maximum of 16 colors, and the bmiColors member of BITMAPINFO contains up to 16 entries. Each pixel in the bitmap is represented by a 4-bit index into the color table. For example, if the first byte in the bitmap is 0x1F, the byte represents two pixels. The first pixel contains the color in the second table entry, and the second pixel contains the color in the sixteenth table entry.
8 The bitmap has a maximum of 256 colors, and the bmiColors member of BITMAPINFO contains up to 256 entries. In this case, each byte in the array represents a single pixel.
16 The bitmap has a maximum of 2^16 colors. If the biCompression member of the BITMAPINFOHEADER is BI_RGB, the bmiColors member of BITMAPINFO is NULL. Each WORD in the bitmap array represents a single pixel. The relative intensities of red, green, and blue are represented with five bits for each color component. The value for blue is in the least significant five bits, followed by five bits each for green and red. The most significant bit is not used. The bmiColors color table is used for optimizing colors used on palette-based devices, and must contain the number of entries specified by the biClrUsed member of the BITMAPINFOHEADER.
If the biCompression member of the BITMAPINFOHEADER is BI_BITFIELDS, the bmiColors member contains three DWORD color masks that specify the red, green, and blue components, respectively, of each pixel. Each WORD in the bitmap array represents a single pixel.
Windows NT/Windows 2000: When the biCompression member is BI_BITFIELDS, bits set in each DWORD mask must be contiguous and should not overlap the bits of another mask. All the bits in the pixel do not have to be used.
Windows 95/98: When the biCompression member is BI_BITFIELDS, the system supports only the following 16bpp color masks: A 5-5-5 16-bit image, where the blue mask is 0x001F, the green mask is 0x03E0, and the red mask is 0x7C00; and a 5-6-5 16-bit image, where the blue mask is 0x001F, the green mask is 0x07E0, and the red mask is 0xF800.
24 The bitmap has a maximum of 2^24 colors, and the bmiColors member of BITMAPINFO is NULL. Each 3-byte triplet in the bitmap array represents the relative intensities of blue, green, and red, respectively, for a pixel. The bmiColors color table is used for optimizing colors used on palette-based devices, and must contain the number of entries specified by the biClrUsed member of the BITMAPINFOHEADER.
32 The bitmap has a maximum of 2^32 colors. If the biCompression member of the BITMAPINFOHEADER is BI_RGB, the bmiColors member of BITMAPINFO is NULL. Each DWORD in the bitmap array represents the relative intensities of blue, green, and red, respectively, for a pixel. The high byte in each DWORD is not used. The bmiColors color table is used for optimizing colors used on palette-based devices, and must contain the number of entries specified by the biClrUsed member of the BITMAPINFOHEADER.
If the biCompression member of the BITMAPINFOHEADER is BI_BITFIELDS, the bmiColors member contains three DWORD color masks that specify the red, green, and blue components, respectively, of each pixel. Each DWORD in the bitmap array represents a single pixel.
Windows NT/ 2000: When the biCompression member is BI_BITFIELDS, bits set in each DWORD mask must be contiguous and should not overlap the bits of another mask. All the bits in the pixel do not need to be used.
Windows 95/98: When the biCompression member is BI_BITFIELDS, the system supports only the following 32-bpp color mask: The blue mask is 0x000000FF, the green mask is 0x0000FF00, and the red mask is 0x00FF0000.
biCompression
Specifies the type of compression for a compressed bottom-up bitmap (top-down DIBs cannot be compressed). This member can be one of the following values. Value Description
BI_RGB An uncompressed format.
BI_RLE8 A run-length encoded (RLE) format for bitmaps with 8 bpp. The compression format is a 2-byte format consisting of a count byte followed by a byte containing a color index. For more information, see Bitmap Compression.
BI_RLE4 An RLE format for bitmaps with 4 bpp. The compression format is a 2-byte format consisting of a count byte followed by two word-length color indexes. For more information, see Bitmap Compression.
BI_BITFIELDS Specifies that the bitmap is not compressed and that the color table consists of three DWORD color masks that specify the red, green, and blue components, respectively, of each pixel. This is valid when used with 16- and 32-bpp bitmaps.
BI_JPEG Windows 98, Windows 2000: Indicates that the image is a JPEG image.
BI_PNG Windows 98, Windows 2000: Indicates that the image is a PNG image.
biSizeImage
Specifies the size, in bytes, of the image. This may be set to zero for BI_RGB bitmaps.
Windows 98, Windows 2000: If biCompression is BI_JPEG or BI_PNG, biSizeImage indicates the size of the JPEG or PNG image buffer, respectively.
biXPelsPerMeter
Specifies the horizontal resolution, in pixels-per-meter, of the target device for the bitmap. An application can use this value to select a bitmap from a resource group that best matches the characteristics of the current device.
biYPelsPerMeter
Specifies the vertical resolution, in pixels-per-meter, of the target device for the bitmap.
biClrUsed
Specifies the number of color indexes in the color table that are actually used by the bitmap. If this value is zero, the bitmap uses the maximum number of colors corresponding to the value of the biBitCount member for the compression mode specified by biCompression.
If biClrUsed is nonzero and the biBitCount member is less than 16, the biClrUsed member specifies the actual number of colors the graphics engine or device driver accesses. If biBitCount is 16 or greater, the biClrUsed member specifies the size of the color table used to optimize performance of the system color palettes. If biBitCount equals 16 or 32, the optimal color palette starts immediately following the three DWORD masks.
When the bitmap array immediately follows the BITMAPINFO structure, it is a packed bitmap. Packed bitmaps are referenced by a single pointer. Packed bitmaps require that the biClrUsed member must be either zero or the actual size of the color table.
biClrImportant
Specifies the number of color indexes that are required for displaying the bitmap. If this value is zero, all colors are required.
Remarks
The BITMAPINFO structure combines the BITMAPINFOHEADER structure and a color table to provide a complete definition of the dimensions and colors of a DIB. For more information about DIBs, see Device-Independent Bitmaps and BITMAPINFO.
An application should use the information stored in the biSize member to locate the color table in a BITMAPINFO structure, as follows:
pColor = ((LPSTR)pBitmapInfo + (WORD)(pBitmapInfo->bmiHeader.biSize));
Windows 98, Windows 2000: The BITMAPINFOHEADER structure is extended to allow a JPEG or PNG image to be passed as the source image to StretchDIBits.
Requirements
Windows NT/2000: Requires Windows NT 3.1 or later.
Windows 95/98: Requires Windows 95 or later.
Header: Declared in Wingdi.h; include Windows.h.
See Also
Bitmaps Overview, Bitmap Structures, BITMAPINFO, BITMAPV4HEADER, BITMAPV5HEADER, CreateDIBitmap , StretchDIBits
Built on Thursday, October 12, 2000Requirements
Windows NT/2000: Requires Windows NT 3.1 or later.
Windows 95/98: Requires Windows 95 or later.
Header: Declared in Wingdi.h; include Windows.h.
See Also
Bitmaps Overview, Bitmap Structures, BITMAPINFO, BITMAPV4HEADER, BITMAPV5HEADER, CreateDIBitmap , StretchDIBits
文中说的很明白，看下面的节录：
biSizeImage
Specifies the size, in bytes, of the image. This may be set to zero for BI_RGB bitmaps.
Windows 98, Windows 2000: If biCompression is BI_JPEG or BI_PNG, biSizeImage indicates the size of the JPEG or PNG image buffer, respectively.
明明说着This may be set to zero for BI_RBG bitmaps。就是说如果位图的biCommpresion是BI_RGB，那么biSizeImage就是0.
Platform SDK: Windows GDI
BITMAPINFOHEADER
The BITMAPINFOHEADER structure contains information about the dimensions and color format of a DIB.
Applications developed for Windows NT 4.0 and Windows 95 may use the BITMAPV4HEADER structure. Applications developed for Windows 2000 and Windows 98 may use the BITMAPV5HEADER structure for increased functionality. However, these are used only in the CreateDIBitmap function.
typedef struct tagBITMAPINFOHEADER{
DWORD biSize;
LONG biWidth;
LONG biHeight;
WORD biPlanes;
WORD biBitCount;
DWORD biCompression;
DWORD biSizeImage;
LONG biXPelsPerMeter;
LONG biYPelsPerMeter;
DWORD biClrUsed;
DWORD biClrImportant;
} BITMAPINFOHEADER, *PBITMAPINFOHEADER;
Members
biSize
Specifies the number of bytes required by the structure.
biWidth
Specifies the width of the bitmap, in pixels.
Windows 98, Windows 2000: If biCompression is BI_JPEG or BI_PNG, the biWidth member specifies the width of the decompressed JPEG or PNG image file, respectively.
biHeight
Specifies the height of the bitmap, in pixels. If biHeight is positive, the bitmap is a bottom-up DIB and its origin is the lower-left corner. If biHeight is negative, the bitmap is a top-down DIB and its origin is the upper-left corner.
If biHeight is negative, indicating a top-down DIB, biCompression must be either BI_RGB or BI_BITFIELDS. Top-down DIBs cannot be compressed.
Windows 98, Windows 2000: If biCompression is BI_JPEG or BI_PNG, the biHeight member specifies the height of the decompressed JPEG or PNG image file, respectively.
biPlanes
Specifies the number of planes for the target device. This value must be set to 1.
biBitCount
Specifies the number of bits-per-pixel. The biBitCount member of the BITMAPINFOHEADER structure determines the number of bits that define each pixel and the maximum number of colors in the bitmap. This member must be one of the following values. Value Meaning
0 Windows 98, Windows 2000: The number of bits-per-pixel is specified or is implied by the JPEG or PNG format.
1 The bitmap is monochrome, and the bmiColors member of BITMAPINFO contains two entries. Each bit in the bitmap array represents a pixel. If the bit is clear, the pixel is displayed with the color of the first entry in the bmiColors table; if the bit is set, the pixel has the color of the second entry in the table.
4 The bitmap has a maximum of 16 colors, and the bmiColors member of BITMAPINFO contains up to 16 entries. Each pixel in the bitmap is represented by a 4-bit index into the color table. For example, if the first byte in the bitmap is 0x1F, the byte represents two pixels. The first pixel contains the color in the second table entry, and the second pixel contains the color in the sixteenth table entry.
8 The bitmap has a maximum of 256 colors, and the bmiColors member of BITMAPINFO contains up to 256 entries. In this case, each byte in the array represents a single pixel.
16 The bitmap has a maximum of 2^16 colors. If the biCompression member of the BITMAPINFOHEADER is BI_RGB, the bmiColors member of BITMAPINFO is NULL. Each WORD in the bitmap array represents a single pixel. The relative intensities of red, green, and blue are represented with five bits for each color component. The value for blue is in the least significant five bits, followed by five bits each for green and red. The most significant bit is not used. The bmiColors color table is used for optimizing colors used on palette-based devices, and must contain the number of entries specified by the biClrUsed member of the BITMAPINFOHEADER.
If the biCompression member of the BITMAPINFOHEADER is BI_BITFIELDS, the bmiColors member contains three DWORD color masks that specify the red, green, and blue components, respectively, of each pixel. Each WORD in the bitmap array represents a single pixel.
Windows NT/Windows 2000: When the biCompression member is BI_BITFIELDS, bits set in each DWORD mask must be contiguous and should not overlap the bits of another mask. All the bits in the pixel do not have to be used.
Windows 95/98: When the biCompression member is BI_BITFIELDS, the system supports only the following 16bpp color masks: A 5-5-5 16-bit image, where the blue mask is 0x001F, the green mask is 0x03E0, and the red mask is 0x7C00; and a 5-6-5 16-bit image, where the blue mask is 0x001F, the green mask is 0x07E0, and the red mask is 0xF800.
24 The bitmap has a maximum of 2^24 colors, and the bmiColors member of BITMAPINFO is NULL. Each 3-byte triplet in the bitmap array represents the relative intensities of blue, green, and red, respectively, for a pixel. The bmiColors color table is used for optimizing colors used on palette-based devices, and must contain the number of entries specified by the biClrUsed member of the BITMAPINFOHEADER.
32 The bitmap has a maximum of 2^32 colors. If the biCompression member of the BITMAPINFOHEADER is BI_RGB, the bmiColors member of BITMAPINFO is NULL. Each DWORD in the bitmap array represents the relative intensities of blue, green, and red, respectively, for a pixel. The high byte in each DWORD is not used. The bmiColors color table is used for optimizing colors used on palette-based devices, and must contain the number of entries specified by the biClrUsed member of the BITMAPINFOHEADER.
If the biCompression member of the BITMAPINFOHEADER is BI_BITFIELDS, the bmiColors member contains three DWORD color masks that specify the red, green, and blue components, respectively, of each pixel. Each DWORD in the bitmap array represents a single pixel.
Windows NT/ 2000: When the biCompression member is BI_BITFIELDS, bits set in each DWORD mask must be contiguous and should not overlap the bits of another mask. All the bits in the pixel do not need to be used.
Windows 95/98: When the biCompression member is BI_BITFIELDS, the system supports only the following 32-bpp color mask: The blue mask is 0x000000FF, the green mask is 0x0000FF00, and the red mask is 0x00FF0000.
biCompression
Specifies the type of compression for a compressed bottom-up bitmap (top-down DIBs cannot be compressed). This member can be one of the following values. Value Description
BI_RGB An uncompressed format.
BI_RLE8 A run-length encoded (RLE) format for bitmaps with 8 bpp. The compression format is a 2-byte format consisting of a count byte followed by a byte containing a color index. For more information, see Bitmap Compression.
BI_RLE4 An RLE format for bitmaps with 4 bpp. The compression format is a 2-byte format consisting of a count byte followed by two word-length color indexes. For more information, see Bitmap Compression.
BI_BITFIELDS Specifies that the bitmap is not compressed and that the color table consists of three DWORD color masks that specify the red, green, and blue components, respectively, of each pixel. This is valid when used with 16- and 32-bpp bitmaps.
BI_JPEG Windows 98, Windows 2000: Indicates that the image is a JPEG image.
BI_PNG Windows 98, Windows 2000: Indicates that the image is a PNG image.
biSizeImage
Specifies the size, in bytes, of the image. This may be set to zero for BI_RGB bitmaps.
Windows 98, Windows 2000: If biCompression is BI_JPEG or BI_PNG, biSizeImage indicates the size of the JPEG or PNG image buffer, respectively.
biXPelsPerMeter
Specifies the horizontal resolution, in pixels-per-meter, of the target device for the bitmap. An application can use this value to select a bitmap from a resource group that best matches the characteristics of the current device.
biYPelsPerMeter
Specifies the vertical resolution, in pixels-per-meter, of the target device for the bitmap.
biClrUsed
Specifies the number of color indexes in the color table that are actually used by the bitmap. If this value is zero, the bitmap uses the maximum number of colors corresponding to the value of the biBitCount member for the compression mode specified by biCompression.
If biClrUsed is nonzero and the biBitCount member is less than 16, the biClrUsed member specifies the actual number of colors the graphics engine or device driver accesses. If biBitCount is 16 or greater, the biClrUsed member specifies the size of the color table used to optimize performance of the system color palettes. If biBitCount equals 16 or 32, the optimal color palette starts immediately following the three DWORD masks.
When the bitmap array immediately follows the BITMAPINFO structure, it is a packed bitmap. Packed bitmaps are referenced by a single pointer. Packed bitmaps require that the biClrUsed member must be either zero or the actual size of the color table.
biClrImportant
Specifies the number of color indexes that are required for displaying the bitmap. If this value is zero, all colors are required.
Remarks
The BITMAPINFO structure combines the BITMAPINFOHEADER structure and a color table to provide a complete definition of the dimensions and colors of a DIB. For more information about DIBs, see Device-Independent Bitmaps and BITMAPINFO.
An application should use the information stored in the biSize member to locate the color table in a BITMAPINFO structure, as follows:
pColor = ((LPSTR)pBitmapInfo + (WORD)(pBitmapInfo->bmiHeader.biSize));
Windows 98, Windows 2000: The BITMAPINFOHEADER structure is extended to allow a JPEG or PNG image to be passed as the source image to StretchDIBits.
Requirements
Windows NT/2000: Requires Windows NT 3.1 or later.
Windows 95/98: Requires Windows 95 or later.
Header: Declared in Wingdi.h; include Windows.h.
See Also
Bitmaps Overview, Bitmap Structures, BITMAPINFO, BITMAPV4HEADER, BITMAPV5HEADER, CreateDIBitmap , StretchDIBits
Built on Thursday, October 12, 2000Requirements
Windows NT/2000: Requires Windows NT 3.1 or later.
Windows 95/98: Requires Windows 95 or later.
Header: Declared in Wingdi.h; include Windows.h.
See Also
Bitmaps Overview, Bitmap Structures, BITMAPINFO, BITMAPV4HEADER, BITMAPV5HEADER, CreateDIBitmap , StretchDIBits
文中说的很明白，看下面的节录：
biSizeImage
Specifies the size, in bytes, of the image. This may be set to zero for BI_RGB bitmaps.
Windows 98, Windows 2000: If biCompression is BI_JPEG or BI_PNG, biSizeImage indicates the size of the JPEG or PNG image buffer, respectively.
明明说着This may be set to zero for BI_RBG bitmaps。就是说如果位图的biCommpresion是BI_RGB，那么biSizeImage就是0.
prog_st 2001-08-03
CreateFile->OpenFile
wolf721 2001-08-03
代码没有错误，大概是测试图象有问题。
pzp 2001-08-03
应该不会吧，是不是窗建文件出错。
ColorBmpTo_OneBitBmp实现1/2/4/8/16/24/32位图转换 //定义调色板大小， 位图中像素字节大小 ，位图文件大小 ， 写入文件字节数 DWORD dwPaletteSize=0, dwBmBitsSize=0, dwDIBSize=0, dwWritten=0; //位图属性结构 BITMAP Bitmap; //位图文件头结构 ...
将图像转换为1位位图 (1像素对应1bit) 将图像转换为1位位图 (1像素对应1bit) 文章参考网址：http://www.voidcn.com/blog/suifeng50/article/p-4907477.html
.net字节流转换为Bitmap图像 本文背景：由于项目用到了C++库进行开发，该库一个回调函数中将位图数据的图像数据作为byte[]传入，用作显示。由于只有图像数据信息，而没有信息头等，所以直接使用Bitmap bitmap = new Bitmap(stream)来构造位图...
[Video and Audio Data Processing] RGB24格式像素数据封装为BMP图像 这种存储方式中“RGB24”格式的像素的分量存储的先后顺序为B、G、R。由于RGB24格式存储的顺序是R、G、B，所以需要将“R”和“B”顺序作一个调换再进行存储。 0.2 BMP图像的高度与RGB相反 0.3 BMP文件结构 BMP文件是...
RGB数据保存为BMP图片 一、BMP文件由文件头、位图信息头、颜色信息和图形数据四部分组成。 1、BMP文件头（14字节） [cpp] view plain copy typedef struct /**** BMP file header structure ****...
位图数据存储格式介绍 BMP是一种常见的图片格式，它由4部分组成，分别为位图文件头、位图信息头、调色板和图像数据。位图文件头的数据结构及其描述说明如下： typedef struct tagBITMAPFILEHEADER { WORD bfType; DWORD bfSize; ...
将Mat图像转换为bmp图像(1位图) 项目需要将Mat图像转换为bmp图像(1位图)参考了一个大神的写法，发现不能正常运行，稍微做了修改。 参考地址：把opencv Mat 按位存成bmp二值图像 （1bit 1pixel）_suifeng50的专栏-CSDN博客 //将mat数组转换为二...
C++ BYTE保存为8位BMP/bitmap位图 两个重点之后给出BYTE数组保存为8位位图的c++ code。 如想直接查阅代码可以跳过1、2部分，直接查看第3部分。 本文主要参照如下五个博客，将内容综合整理以备查阅。 1）位图格式分析：...
8位位图转换为24位位图 其实，只要从8位位图中取得一个像素的灰度值，然后去填充24位位图的三个字节就可以了，很明显，这样得到的24位位图是灰度的，就是RGB各分量是一样的值。 主要的转换程序 /***********************************...
BMP图像数据格式详解 Windows系统内部各图像绘制操作都是以BMP为基础的。Windows 3.0以前的BMP图文件格式与显示设备有关，因此把这种BMP图象文件格式称为设备相关位图DDB(device-dependent bitmap)文件格式。Windows 3
【数据与封装格式】BMP图像（位图） 梳理了点阵、位图、RGB图像、矢量图这几个之间的区别关系与联系 一、概念 1、矢量图 使用直线和曲线来描述图形，这些图形的元素是一些点、线、矩形、多边形、圆和弧线等等，它们都是通过数学公式计算获得的。 位图...
目的：通过构建bitmap header将图像unsigned char*纯数据 数组图像保存为位图 ####目的：通过构建bitmap header将图像unsigned char*纯数据 数组图像保存为位图 ####环境： 系统：Win10 x64 环境：win10/centos 7.5 vs2017/gcc ####问题分析： 有朋友在c环境下，使用cv::Mat.data保存了...
视频图像数据处理七：将rgb视频图像封装为bmp图像 本文介绍了将rgb视频图像封装为bmp图像的方法，附有详细的代码和图像示例。...bmp图片由文件头和像素两部分组成，其中文件头又包括位图文件信息和位图结构信息，文件头两部分信息的结构如下所示。 typede...
C语言实现将彩色BMP位图转化为二值图 这个对齐是位图每行像素的对齐，不要和上面的结构体对齐混淆，每行像素所占字节数必须是4字节的整数倍，不足的要填充，这时因为内存分配单位是32位的，即4字节，读入的每行像素是连续的，不能和其他行共占一个内存...
对于一个".bmp"图片，获取其像素值的大小和个数 题目：对于一个".bmp"图片，获取其像素值的大小和个数 解析：废话不多说，直接上已经调试好的程序 #define _CRT_SECURE_NO_WARNINGS #include using namespace std; #include #include #include #include #...
视音频数据处理入门：RGB、YUV像素数据处理 上述调用函数的代码运行后，将会把一张分辨率为256x256的名称为lena_256x256_yuv420p.yuv的YUV420P格式的像素数据文件处理成名称为output_gray.yuv的YUV420P格式的像素数据文件。输入的原图如下所示。 处理后的...
将RGB数据写入BMP位图文件 //略过位图文件头、信息头 ，为什么是54，往下看 buffer = new BYTE[dwLen - 54]; //为缓冲区分配空间 file.Read(buffer, dwLen - 54); //(整个位图由文件头、信息头、调色板、颜色表这四部分组合构成 typedef...
