本文介绍一种批量转换nii文件到png图像的方法，亲测可用！！！

1、说明：

##以下图为例，进行转换

转换后，针对每个文件生成对应得文件夹，文件夹下面有一个‘z’文件夹（沿着z轴划分的切片），该文件夹下面是所有切片后的png或者jpg图像。

转换后效果如下：

2、下面进行详细的代码展示：

###只需要进行简单的路径修改即可实现批量转换！！！

代码如下（示例）：

import matplotlibmatplotlib.use('TkAgg')import nibabel as nibimport numpy as npimport osimport imageio# ---------------------------------------------## nii_path : nii文件的路径# img_save_path : 切片的保存路径# axis : 说明是沿着哪个方向切片的# ---------------------------------------------def nii_to_png(nii_path, img_save_path, axis):# 若保存路径不存在，则创建if not os.path.exists(img_save_path):os.makedirs(img_save_path)nii = nib.load(nii_path)nii_fdata = nii.get_fdata()nii_fdata = np.rot90(nii_fdata)# 以切片的轴向作为保存png的子文件夹名foldername = axispng_save_path = os.path.join(img_save_path, foldername)if not os.path.exists(png_save_path):os.mkdir(png_save_path)flag = 100if axis == 'x':(axis, y, z) = nii.shapeflag = 0elif axis == 'y':(x, axis, z) = nii.shapeflag = 1elif axis == 'z':(x, y, axis) = nii.shapeflag = 2else:print("wrong axis")for i in range(axis):if flag == 0:slice = nii_fdata[i, :, :]elif flag == 1:slice = nii_fdata[:, i, :]elif flag == 2:slice = nii_fdata[:, :, i]# 以数字1,2,3...为png图片命名imageio.imwrite(os.path.join(png_save_path, '{}.png'.format(i)), slice)def all_nii_to_png(all_nii_path,all_image_save_path, axis):all_nii_path_list = os.listdir(all_nii_path)for i in range(len(all_nii_path_list)):nii_to_png(os.path.join(all_nii_path,all_nii_path_list[i]),os.path.join(all_image_save_path, all_nii_path_list[i]), axis)print("第{}个nii文件转换完成！".format(i))if __name__ == "__main__":all_nii_path = r'E:\all_dataset\covid-19-ct-seg\Lung_Mask'all_image_save_path = r'E:\all_dataset\covid-19-ct-seg\Lung_Mask_processed'all_nii_to_png(all_nii_path, all_image_save_path, 'z')