如何在 MATLAB 中读取 .img 图像格式？答案

【问题标题】：How can I read .img image format in MATLAB?如何在 MATLAB 中读取 .img 图像格式？
【发布时间】：2016-02-14 09:42:12
【问题描述】：

我有 .img 格式的 X 射线图像。

我如何在 MATLAB 中读取 .img 图像格式并转换为 png 或其他图像格式？

【问题讨论】：

在这种情况下，文件扩展名并不能说明文件格式。它可能是一个 ISO 磁盘映像，但这有点奇怪。首先找出你有什么样的文件。文件开头可能存在一些幻数或类似数字，可以识别文件格式：en.wikipedia.org/wiki/File_format#Magic_number
我建议对您的标题进行编辑，但被拒绝。我仍然认为您应该将其更改为更准确地描述您所指的图像格式。

标签： image-processing matlab

【解决方案1】：

在 X 射线图像的上下文中，“.img”文件是 Mayo 分析类型图像的二进制文件。您也需要“.hdr”文件。 matlab 本身不支持这种格式，除非您有图像处理工具箱（在这种情况下，请查看analyze75read 函数）。

但您也可以使用文件交换库中的函数来读取它们（未经我测试）：

http://www.mathworks.com/matlabcentral/fileexchange/1878-mri-analyze-tools

加载图像时参考“.hdr”文件，而不是“.img”。

【讨论】：

【解决方案2】：

以下代码足以解决您的问题。

% the .img file is opened
f = fopen('image.img')
% the f variable is read as an image with the uint8 datatype
image = fread(f, [256 378], '*uint8');
% show the image
imshow(image,[])
% write the image with the your extension choose
imwrite(image, 'filename.extension', 'extension')

matlab支持的扩展有

'bmp'      Windows® Bitmap (BMP)


1-bit, 8-bit, and 24-bit uncompressed images

'gif'     Graphics Interchange Format (GIF)


8-bit images

'hdf'     Hierarchical Data Format (HDF4)


8-bit raster image data sets with or without associated colormap, 24-bit raster image data sets

'jpg' or 'jpeg'    Joint Photographic Experts Group (JPEG)


8-bit, 12-bit, and 16-bit Baseline JPEG images

    Note:   imwrite converts indexed images to RGB before writing data to JPEG files, because the JPEG format does not support indexed images.

'jp2' or 'jpx'   JPEG 2000 — Joint Photographic Experts Group 2000


1-bit, 8-bit, and 16-bit JPEG 2000 images

'pbm'   Portable Bitmap (PBM)


Any 1-bit PBM image, ASCII (plain) or raw (binary) encoding

'pcx'   Windows Paintbrush (PCX)


8-bit images

'pgm'   Portable Graymap (PGM)


Any standard PGM image; ASCII (plain) encoded with arbitrary color depth; raw (binary) encoded with up to 16 bits per gray value

'png'   Portable Network Graphics (PNG)


1-bit, 2-bit, 4-bit, 8-bit, and 16-bit grayscale images; 8-bit and 16-bit grayscale images with alpha channels; 1-bit, 2-bit, 4-bit, and 8-bit indexed images; 24-bit and 48-bit truecolor images; 24-bit and 48-bit truecolor images with alpha channels

'pnm'   Portable Anymap (PNM)


Any of the PPM/PGM/PBM formats, chosen automatically

'ppm'   Portable Pixmap (PPM)


Any standard PPM image: ASCII (plain) encoded with arbitrary color depth or raw (binary) encoded with up to 16 bits per color component

'ras'   Sun™ Raster (RAS)


Any RAS image, including 1-bit bitmap, 8-bit indexed, 24-bit truecolor, and 32-bit truecolor with alpha

'tif' or 'tiff'   Tagged Image File Format (TIFF)


Baseline TIFF images, including:

    1-bit, 8-bit, 16-bit, 24-bit, and 48-bit uncompressed images and images with packbits, LZW, or Deflate compression

    1-bit images with CCITT 1D, Group 3, and Group 4 compression

    CIELAB, ICCLAB, and CMYK images

'xwd'  X Windows Dump (XWD)


8-bit ZPixmaps

【讨论】：