Concepts

The table below contains the full list of concepts and the descriptions we gave to the annotators.

0 timeofday_day
The picture shows that it was taken during the day.

1 timeofday_night
The picture shows that it was taken during the night.

2 timeofday_sunrisesunset
The picture shows that it was taken during the transition from night to day or from day to night, i.e. during sunrise, sunset, dusk, dawn or twilight.

3 celestial_sun
The picture shows the sun. If only the effects of the sun are visible, e.g. clouds are lit up by the sunshine but the sun itself is not visible, then you should not mark the image as showing the sun.

4 celestial_moon
The picture shows the moon.

5 celestial_stars
The picture shows the stars in the sky.

6 weather_clearsky
The picture shows a sky that is completely clear of clouds, although a small amount of white puffs of water vapor in a clear sky is still acceptable.

7 weather_overcastsky
The picture shows a sky that is completely covered in densely packed clouds, although a small amount of visible sky is acceptable.

8 weather_cloudysky
The picture shows a sky containing one or more large solid clouds. In principle it is the middle ground between a clear sky and an overcast sky.

9 weather_rainbow
The picture shows a rainbow.

10 weather_lightning
The picture shows a lightning strike.

11 weather_fogmist
The picture shows a cloud of water, dust or sand particles suspended in the atmosphere at or near the earth's surface that obscures or restricts visibility. Note that this at times may look similar to smoke, so please do not confuse the two concepts.

12 weather_snowice
The picture shows snow or ice. This also includes whiteness as a result of frost.

13 combustion_flames
The picture shows flames emitted from a fire source.

14 combustion_smoke
The picture shows smoke emitted from a fire source, such as smoke coming out of chimneys, cigarettes and airplanes.

15 combustion_fireworks
The picture shows exploding fireworks.

16 lighting_shadow
The picture shows a sharp and clearly visible shadow of something in the scene. This means that we are not looking for soft shadows, vague shadows and small shadows, and we are also not looking for shadows of something not visible in the scene.

17 lighting_reflection
The picture shows a sharp and clearly visible reflection of something in the scene. This means that we are not looking for soft reflections, vague reflections and small reflections, and we are also not looking for reflections of something not visible in the scene.

18 lighting_silhouette
The picture shows a silhouette of something in the scene. A silhouette refers to the dark shape and outline of someone or something visible against a lighter background. You should not be able to see any details of the shape due to it being so dark. For a silhouette to be present there must be some kind of background light visible. Pay attention with black and white images, because you may easily confuse actual dark shapes with silhouettes.

19 lighting_lenseffect
The picture shows that the light sources visible in the image have been affected in some way. We are particularly looking for lens flares, where circular lighting effects are visible in the image, halos, where spiky lighting effects are visible around the light source, and bokeh, where the light sources are severely blurred.

20 scape_mountainhill
The picture shows a mountain or hill.

21 scape_desert
The picture shows a desert, containing sandy or rocky plains.

22 scape_forestpark
The picture shows a forest or park, typically containing many trees and/or grass. We are not interested in people's gardens/backyards.

23 scape_coast
The picture shows a coast, where the sea meets land. This includes photos showing cliffs, rocks sticking out of the sea close to land and the beach. In principle, it needs to be clear the image was taken at the coast or of the coast.

24 scape_rural
The picture shows a landscape of the countryside, typically showing an open view of a rural or agricultural environment with at most a few man-made objects like cottages and small roads.

25 scape_city
The picture shows a view of the city from the inside or the outside. We are interested in photos that let you get a clear impression of the city, so this means we are not looking for photos focusing on specific things in the city like shops, people and cars; rather, the scene will typically be taken with a zoomed out lens to capture as much of the scene as possible.

26 scape_graffiti
The picture shows a large piece of graffiti that is the dominant feature of the scene.

27 water_underwater
The picture shows an underwater scene.

28 water_seaocean
The picture shows a sea or ocean.

29 water_lake
The picture shows a lake.

30 water_riverstream
The picture shows a river or stream.

31 water_other
The picture shows liquid water not belonging to the other water categories. It can appear in all shapes and forms, such as a glass of water, water droplets, or a puddle of rain.

32 flora_tree
The picture shows a tree or a close-up of a tree.

33 flora_plant
The picture shows an indoor or outdoor plant, which typically has many leaves and small or no flowers. This includes cacti and close-ups of plants. As a rule of thumb, if you yourself would put what you see in a vase, then it is a flower. If you would put it in a pot, then it is a plant.

34 flora_flower
The picture shows an indoor or outdoor plant, which typically has small or no leaves and a big flower. This includes close-ups of flowers. As a rule of thumb, if you yourself would put what you see in a vase, then it is a flower. If you would put it in a pot, then it is a plant.

35 flora_grass
The picture shows a field of grass or a close-up of grass.

36 fauna_cat
The picture shows a cat-like animal. This includes wild cats such as lions and cheetahs.

37 fauna_dog
The picture shows a dog-like animal. This includes wild dogs such as wolves.

38 fauna_horse
The picture shows a horse-like animal. This includes animals such as donkeys.

39 fauna_fish
The picture shows a fish-like animal. This includes animals such as sharks. Photos showing underwater creatures that do not look like typical fish, such as jellyfish, seahorses, tortoises, etc. should not be marked with this concept.

40 fauna_bird
The picture shows a bird-like animal. This includes animals such as pelicans, flamingos, ducks, geese and swans.

41 fauna_insect
The picture shows an insect-like animal. This includes animals such as flies, wasps, bees, butterflies and moths.

42 fauna_spider
The picture shows a spider-like animal.

43 fauna_amphibianreptile
The picture shows an amphibian-like or reptile-like animal. This includes animals such as lizards, chameleons, frogs and crocodiles.

44 fauna_rodent
The picture shows a rodent-like animal. This includes animals such as squirrels, hamsters, mice and rats.

45 quantity_none
The picture shows no people.

46 quantity_one
The picture shows one person.

47 quantity_two
The picture shows two people.

48 quantity_three
The picture shows three people.

49 quantity_smallgroup
The picture shows a small group of people (4-9 persons).

50 quantity_largegroup
The picture shows a large group of people (10+ persons).

51 age_baby
The picture shows a baby (0-2 years of age).

52 age_child
The picture shows a child (2-10 years of age).

53 age_teenager
The picture shows a teenager (10-18 years of age).

54 age_adult
The picture shows an adult (18-65 years of age).

55 age_elderly
The picture shows an elderly person (65 years of age and older).

56 gender_male
The picture shows a male person.

57 gender_female
The picture shows a female person.

58 relation_familyfriends
The picture shows people that are likely friends or family of each other.

59 relation_coworkers
The picture shows people that are likely co-workers of each other.

60 relation_strangers
The picture shows people that likely do not know each other.

61 quality_infocus
The picture shows a scene of which most, if not all, of the content is in focus. As a rule of thumb, the photographer that took the photo wanted to capture everything in the scene and did not focus on anything specifically.

62 quality_selectivefocus
The picture shows a scene that partly is very much in focus and partly very much out of focus. You can clearly distinguish between an area in the image that is the 'foreground' and another area that is the 'background'. As a rule of thumb, the photographer that took the photo wanted to capture one particular part of the scene in particular, which is the part that is in focus, whereas the other part is out of focus.

63 quality_completeblur
The picture shows a scene of which most, if not all, of the content is out of focus. As a rule of thumb, the photographer that took the photo made a mistake and did not properly set the lens focus, so the scene is a bit or very much blurred.

64 quality_motionblur
The picture shows a scene of which part or all is blurred as a result of the camera moving or part of the scene moving while the photo was taken. This includes long exposure photos resulting in light trails. Typically when the camera was moved the entire scene looks streaky, whereas if part of the scene moved then only that part looks streaky.

65 quality_noisyblocky
The picture is of low quality and very noisy or blocky. This is not because the scene is out of focus, but because the image was shot at a very low resolution or it was compressed afterwards. It may also be taken in low light conditions, introducing lots of tiny specks in the image.

66 style_pictureinpicture
The picture is divided into multiple different photos.

67 style_circularwarp
The picture shows a scene that is distorted/warped, so that straight lines in the scene look curved/round in the image and give a circular effect.

68 style_graycolor
The picture shows a scene where most of the content is shown in black-and-white (grayscale), but only a small part is shown in its original color(s).

69 style_overlay
The picture contains a piece of text or a logo that the photographer has added to the photo after it was taken, for example a copyright statement. Thus the text or logo was not present in the original scene.

70 view_portrait
The picture shows a scene where one or more persons are the center of attention, typically facing the camera and aware that a photo is being taken of them. The photo normally captures at least their entire face, although a small part of it may be missing.

71 view_closeupmacro
The picture shows a close-up of objects, where a lot of zoom has been used by the photographer, and includes macro shots, where things are shown much larger than they normally are. In contrast with a portrait a close-up can be of anything and not just people, although a photo showing only a face would be called a portrait.

72 view_indoor
The picture shows an indoor scene.

73 view_outdoor
The picture shows an outdoor scene.

74 setting_citylife
The picture shows a typical scene from life in the city or town, showing for instance streets, shops, restaurants or bars. The picture may also show people doing their regular things such as shopping, talking and commuting. The image must clearly show it was taken in a city or town.

75 setting_partylife
The picture shows scenes related to parties or celebrations, where people for instance are dancing, drinking or chatting, a music band is performing on stage or it may even show party-related equipment. Photos showing parties are typically taken during night time, although this does not always have to be the case.

76 setting_homelife
The picture shows scenes of things taking place in or around one's home, such as having dinner, watching television, lying in bed, reading a book in the garden or even playing with the cat. The image must clearly show it was taken in or around someone's home.

77 setting_sportsrecreation
The picture shows a scene where people are doing or watching sports or are enjoying themselves in a relaxed way, such as lying on the beach. Note that recreation is not the same as having or being at a party; a party is typically an organized event for dancing or celebrating, whereas recreation is more the opposite.

78 setting_fooddrink
The picture shows a scene where food and/or drink play an important role. A photo showing only a little bit of food or drink, which does not have particular focus in the scene, should not be marked with this concept.

79 impression_happy
The picture shows a scene that looks happy and/or gives you a happy and warm feeling. Other words you can associate with this concept are joy and pleasure.

80 impression_calm
The picture shows a scene that looks calm, quiet, peaceful and/or relaxed. Other words you can associate with this concept are soothing and comforting.

81 impression_inactive
The picture shows a scene where nothing exiting happens and it expresses a sense of timelessness. Other words you can associate with this concept are boring and passive.

82 impression_melancholic
The picture shows a scene that looks gloomy and depressed, giving you a sense of sadness and darkness. An example would for instance be the feeling you get when you miss someone.

83 impression_unpleasant
The picture shows a scene that feels uncomfortable, troublesome or nasty, giving you a general sense of unpleasantness. Other words you can associate with this concept are displeasing and dreadful.

84 impression_scary
The picture shows a scene that is sinister or terrifying. Other words you can associate with this concept are spooky and horrifying.

85 impression_active
The picture shows a scene that is dynamic, colorful and gives you energy. Other words you can associate with this concept are uplifting, lively, sporty and busy.

86 impression_euphoric
The picture shows a scene that bursts with energy and joy, giving you the impression of being on top of the world. Other words you can associate with this concept are excited, ecstatic and blissful.

87 impression_funny
The picture shows a scene looks comical and makes you laugh.

88 transport_cycle
The picture shows an unmotorized or motorized bike. This includes bikes such as pushbikes, scooters and motorbikes. A bike typically has two wheels, but can have three wheels or even have a sidecar attached.

89 transport_car
The picture shows a car. This includes sedans, convertibles, vans, landrovers, suburbans, pick-up trucks, race cars and even taxis. In principle, vehicles that belong to this category have four wheels and have as main purpose the transport of only a small number of people or personal materials. Note that we are not looking for photos taken from within the vehicle, but only from the outside.

90 transport_truckbus
The picture shows a truck or bus. In principle, vehicles that belong to this category have six wheels or more and have as main purpose the transport of many people or goods. Note that we are not looking for photos taken from within the vehicle, but only from the outside.

91 transport_rail
The picture shows a rail vehicle, such as a train, tram and metro. Note that we are not looking for photos taken from within the vehicle, but only from the outside.

92 transport_water
The picture shows a water vehicle, such as a rowing boat, sailing boat, yacht, navy ship and freighter. Note that we are not looking for photos taken from within the vehicle, but only from the outside.

93 transport_air
The picture shows an air vehicle, such as an airplane and helicopter. Note that we are not looking for photos taken from within the vehicle, but only from the outside.