how to detect the color of a region is black?

asked 2016-09-30 12:10:00 -0600

greenworld
1 ●1 ●2

Dear everyone, Could you please help to detect a region whether it is black or not from a RGB/HSV image? Thank you!

answered 2016-09-30 16:39:27 -0600

Tetragramm

7376 ●13 ●37

If you look at what the HSV colorspace is, it should be pretty obvious. Take the V channel (or covert RGB to gray, basically same thing) and look for very low values.

Exactly 0 is perfect black, and some threshold above is what appears black to you. You have to manually pick that threshold, there's no exact value.

edit flag offensive delete link

Comments

Dear Tetragram, if the image in an environment with brightness, can you suggest any method to recognize the region (like without brightness circumstances), eliminate all glare. Thank you so much!

greenworld ( 2016-10-01 05:33:43 -0600 )edit

What you have said could mean many things. Could you post an example picture of before/after for what you mean?

Tetragramm ( 2016-10-01 06:35:07 -0600 )edit

add a comment

how to detect the color of a region is black?

1 answer

Comments

Links

Question Tools

Stats

how to detect the color of a region is black? edit

1 answer

Comments

Links

Question Tools

Stats

how to detect the color of a region is black?