About the data set
Distortions in complex images
This data set was measured for comprehensive testing of visual
models using actual distortions and complex images. The distortions
are white-noise, JPEG compression artifacts, bilinear upsampling
(blurring), and sine-gratings. All distortions are restricted to a
small image regions to simplify the measurements.
The thresholds were measured in the 4-alternative-forced-choice
experiment, in which all four images were shown side-by-side. The
measurement procedure was the same as for the "Contrast sensitivity
for wide luminance range" data set.
Stimuli list
All stimuli shown at the detection threshold magnified x10. The visible banding (quantization) is due to 8-bit image files and display panel and is not present in the actual data.
carney_springs_mid rock sin 6
mean luminance = 35.6515 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
carney_springs_mid sky noise
mean luminance = 35.6515 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
carney_springs_mid sky sin 6
mean luminance = 35.6515 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
carney_springs_mid rock noise
mean luminance = 35.6515 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
carney_springs_mid sky jpeg
mean luminance = 35.6515 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
carney_springs_grass grass noise
mean luminance = 31.3817 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
carney_springs_grass grass sin 6
mean luminance = 31.3817 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
carney_springs_grass grass jpeg
mean luminance = 31.3817 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
carney_springs_grass grass upsampling
mean luminance = 31.3817 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
cultural_mix band noise
mean luminance = 14.5159 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
cultural_mix face sin 6
mean luminance = 14.5159 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
cultural_mix band sin 6
mean luminance = 14.5159 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
cultural_mix face noise
mean luminance = 14.5159 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
cultural_mix band jpeg
mean luminance = 14.5159 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
cultural_mix face jpeg
mean luminance = 14.5159 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
cultural_mix band upsampling
mean luminance = 14.5159 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
cultural_mix face upsampling
mean luminance = 14.5159 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
cultural_mix band sin 2
mean luminance = 14.5159 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
cultural_mix face sin 2
mean luminance = 14.5159 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
cultural_mix band sin 16
mean luminance = 14.5159 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
cultural_mix face sin 16
mean luminance = 14.5159 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
hmong_babygirl forehead noise
mean luminance = 12.3539 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
hmong_babygirl cap noise
mean luminance = 12.3539 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
hmong_babygirl forehead sin 6
mean luminance = 12.3539 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60
hmong_babygirl cap sin 6
mean luminance = 12.3539 cd/m2
threshold_p = 0.66
surround_l = 50
viewing_distance = 0.9
rgb_display = led-lcd
pixels_per_degree = 60