在 Octave 中读取 tif 文件的问题

Question

I am trying to read a medical imaging data which is in .tif format using Octave . It so happens that only software from https://fiji.sc/ has the ability to read the medical images I have. A sample of the image that I am referring is this one. This image is readable in .tif format only in fiji. The image can also be converted to jpg image. Only after data points is visible to other image editing software. Now the issue is , I want to load it into octave and read it - at the moment it is not possible. The imshow() function in octave is not allowing me to visualize the given .tif file.

So, if anybody has experience in reading such file formats please let me know. Thanks.

Answer 1

Your linked image is a 16bit grayscale image, see $ gm identify -verbose hello.tif . So lets load it into GNU Octave:

img = imread ("hello.tif");
hist (img(:), 200);            # show histogram

Ah!, the main information of your image is in the range 0-600 (probably the image aquisition system used had 11 or 12bit resolution), so lets scale and print this part as color encoded (viridis) image:

imagesc (img, [0 600])
colorbar

Is this what you want? Of course we can also use a gray colormap, try: colormap gray

If this still doesn't fit your need you should really explain what you expect to see....

Answer 2

imread() 依靠图像魔术来进行转换，其中一些版本只能以 8 位模式读取 TIFF（给出警告消息），但我不知道何时以及如何发生这种情况。

Answer 3

It works for me using a .raw ṕicture converted to .tif in Fiji. I am specifically interested in several spectral analysis from my pictures which are taken illuminating with 660 and 850nm.