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The term "camera obscura" also refers to constructions or devices that make use of the principle within a box, tent or room.
Camerae obscurae with a lens in the opening have been used since the second half of the 16th century and became popular as an aid for drawing and painting.
This picture and caption appeared on a Londoner's Facebook page.
Facebook has since taken down the account and London police are investigating.
The camera obscura box was developed further into the photographic camera in the first half of the 19th century when camera obscura boxes were used to expose light-sensitive materials to the projected image.
Before the term "camera obscura" was first used in 1604, many other expressions were used including "cubiculum obscurum", "cubiculum tenebricosum", "conclave obscurum" and "locus obscurus".
A camera obscura device without a lens but with a very small hole is sometimes referred to as a "pinhole camera", although this more often refers to simple (home-made) lens-less cameras in which photographic film or photographic paper is used.
works much like a camera obscura with an opening (pupil), a biconvex lens and a surface where the image is formed (retina)."If someone takes your picture in a public space, and there's no sexual intent, and there's no threat, there isn't really a criminal offence that's been committed," Loizides said."Simply taking a picture of somebody, whether you're in the background or not, you can't force that person to delete the picture."I don't think people understand how far reaching this is. Just after noon on Thursday, the profile page belonging to the individual was taken down.Facebook directed CBC to its community standards that includes removing hate speech, which it defines as 'direct attacks (on) people based on their race, ethnicity, national origin, religious affiliation, sexual orientation, sex, gender, or gender identity, or serious disabilities or diseases.' Police said they continue to investigate whether a criminal offence has been committed.
from Latin, meaning "dark room": camera "(vaulted) chamber or room," and obscura "darkened, dark"), also referred to as pinhole image, is the natural optical phenomenon that occurs when an image of a scene at the other side of a screen (or for instance a wall) is projected through a small hole in that screen as a reversed and inverted image (left to right and upside down) on a surface opposite to the opening.