Intersect operation

[lkluo]

The intersect operation always returns results, however, it is not true when two blocks are not overlapped.

[lolipopshock]

Thanks for reporting. Yes, that's a bug - should be fix in the next update.

[lkluo]

@lolipopshock By the way, I think the is_in operation is too strict. Would it be better to allow some flexibility? This is especially useful for some blocks which are either labelled as text or title.

[lolipopshock]

@lolipopshock By the way, I think the is_in operation is too strict. Would it be better to allow some flexibility? This is especially useful for some blocks which are either labelled as text or title.

Does the soft_margin and center parameters in the is_in function help? (See in the documentation)

[lkluo]

Thanks @lolipopshock for your prompt reply. What you mention could be an instant solution. On the other hand, correct me if I am wrong, it requires to provide absolute value for soft_margin which is case-by-case. Would it better to use block intersection as a criterion? If block A is in block B, both of them shall intersect with each other. In other words, intersect_area/block_a_area shall be close to 1.

[lolipopshock]

What you mention could be an instant solution. On the other hand, correct me if I am wrong, it requires to provide absolute value for soft_margin which is case-by-case. Would it better to use block intersection as a criterion? If block A is in block B, both of them shall intersect with each other. In other words, intersect_area/block_a_area shall be close to 1.

Ahh if you set center=True, then if block A's center is within block B's boundary, then block_A.is_in(block_B, center=True) ==True. For example,

import layoutparser as lp
import numpy as np

block_A = lp.Rectangle(50, 50, 150, 150)
block_B = lp.Rectangle(40, 60, 160, 130)

lp.draw_box(np.ones((200,200,3), dtype='uint8')*255, [block_A, block_B])

assert block_A.is_in(block_B) == False
assert block_A.is_in(block_B, center=True) == True

[lkluo]

Thanks, it works.

[lkluo]

Sorry, there is still exception even though setting center=True. In your example, when block_A contains block_B, block_A.is_in(block_B, center=True) is true. Then is_in is a little bit confused.

[lkluo]

You may be also interested in this example: block_A = lp.Rectangle(40, 50, 150, 150) block_B = lp.Rectangle(40, 120, 140, 151)

[lolipopshock]

You may be also interested in this example: block_A = lp.Rectangle(40, 50, 150, 150) block_B = lp.Rectangle(40, 120, 140, 151)

Good point. In this case, you might want to use soft_margin:

block_A = lp.Rectangle(40, 50, 150, 150) 
block_B = lp.Rectangle(40, 120, 140, 151)

assert block_B.is_in(block_A, soft_margin={'bottom':5})
assert block_B.is_in(block_A, soft_margin={'bottom':1}) # this also works