如何解决在每个图像像素中为 2D 图像创建居中的补丁
大家好,我正在尝试从 2D 图像创建补丁。我需要这些补丁必须在每个像素图像中居中。我正在使用此代码:
#patches for each point in 2D slice
patch_size = 27
pacth_m_size = patch_size//2
for x in range(0,sld_arr_norm.shape[0]):
for y in range(0,sld_arr_norm.shape[1]):
if x-pacth_m_size>0: # if all is ok the get the patch
if y-pacth_m_size>0:
if x+pacth_m_size<sld_arr_norm.shape[1]:
if y+pacth_m_size<sld_arr_norm.shape[1]:
x_i = x-pacth_m_size
x_s = x+pacth_m_size+1
y_i = y-pacth_m_size
y_s = y+pacth_m_size+1
curr_patch= sld_arr_norm[x_i:x_s,y_i:y_s]
assert curr_patch.shape == (patch_size,patch_size)
print(curr_patch.shape)
else:
x_i = x-pacth_m_size
x_s = x+pacth_m_size+1
y_i = y-pacth_m_size
y_s = y+pacth_m_size+1
if x-pacth_m_size<0:
issue_patch = sld_arr_norm[0:x_s,y_i:y_s]
curr_patch = np.zeros((patch_size,patch_size))
star_index = abs(x-pacth_m_size)
curr_pacth[star_index:,:]=issue_patch.copy()
if y-pacth_m_size<0:
issue_patch = sld_arr_norm[x_i:x_s,0:y_s]
curr_patch = np.zeros((patch_size,patch_size))
star_index = abs(y_i)
curr_pacth[:,star_index:]=issue_patch.copy()
if y+pacth_m_size>sld_arr_norm.shape[1]:
issue_patch = sld_arr_norm[x_i:x_s,patch_size))
end_index = abs(y_s-issue_patch.shape[1])
curr_patch[0:,0:curr_patch.shape[1]-end_index]=issue_patch.copy() #issue_patch[x_i:x_s,y_i:issue_patch.shape[1]]
if x+pacth_m_size>sld_arr_norm.shape[0]:
issue_patch = sld_arr_norm[x_i:x_s,y_i:y_s]
curr_patch = np.zeros((patch_size,patch_size))
end_index = abs(x_s-issue_patch.shape[0])
curr_patch[0:arr_zeros.shape[0]-end_index,:]=issue_patch.copy()
assert curr_patch.shape == (patch_size,patch_size)
print(curr_patch.shape)
问题出在图像的边界上 我面临着一些问题,例如补丁不依赖于定义的补丁大小。您知道任何允许以这种方式创建补丁的库吗?
解决方法
最好的方法是首先填充整个图像。然后,我们可以继续提取补丁而不必担心边缘。代码如下所示:
#Define patch size
patch_size = 13
pacth_m_size = patch_size//2
#Patch the whole image
sld_arr_norm_pad = np.pad(sld_arr_norm,pacth_m_size,'wrap')
for x in range(0,sld_arr_norm.shape[0]):
for y in range(0,sld_arr_norm.shape[1]):
x_real = x + pacth_m_size
y_real = y + pacth_m_size
x_i = x_real - pacth_m_size
x_s = x_real + pacth_m_size + 1
y_i = y_real - pacth_m_size
y_s = y_real + pacth_m_size + 1
curr_patch = sld_arr_norm_pad[x_i:x_s,y_i:y_s]
print(curr_patch.shape)
print((x_i,x_s,y_i,y_s))
assert curr_patch.shape == (patch_size,patch_size)
希望这对其他人有帮助。
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