Related Experiment Video
Updated: Aug 5, 2026
04:43
Visualizing Visual Adaptation
Published on: April 24, 2017
Blur and contrast as pictorial depth cues
R P O'Shea1, D G Govan, R Sekuler
1Department of Psychology, University of Otago, Dunedin, New Zealand. r.oshea@otago.ac.nz
Perception
|January 1, 1997
Summary
Blur and contrast both influence depth perception. This study found blur acts as an independent depth cue, especially at moderate contrasts, even when contrast levels are equated.
Area of Science:
- Visual Perception
- Psychophysics
Background:
- Blur and contrast are known pictorial cues for depth perception.
- The independent contribution of blur to depth perception remains unclear due to its relationship with contrast.
Purpose of the Study:
- To investigate whether blur influences depth perception independently of contrast.
- To determine the interaction between blur and contrast in depth perception.
Main Methods:
- Two experiments independently manipulated blur and contrast.
- Observers reported depth alternations in a reversible figure stimulus.
- Stimuli were equated for contrast (Michelson or RMS) to isolate the effect of blur.
Main Results:
- Both blur and contrast significantly influenced depth perception.
- Blur's effect was most pronounced at moderate contrast levels.
- Blur continued to affect depth perception even when stimuli were equated for contrast.
Conclusions:
- Blur serves as an independent pictorial cue for depth perception.
- The effectiveness of blur as a depth cue may stem from its association with other depth cues in natural scenes and images.
More Related Videos
Related Concept Videos
01:26Phase Contrast and Differential Interference Contrast Microscopy
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
01:05Difference from Background: Limit of Detection
The limit of detection (LOD) is the smallest amount of analyte that can be distinguished from the background noise. The LOD value corresponds to the concentration at which the analyte signal is three times larger than the standard deviation of the blank signal. Below this value, the analyte signal cannot be differentiated from the background noise. It is calculated by dividing the calibration slope by 3 times the standard deviation of the blank signals.
The LOD indicates the presence or absence...
The LOD indicates the presence or absence...
01:16Focusing of Light in the Eye
Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
01:15Depth Perception and Spatial Vision
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
01:21Gestalt Principles of Perception
Gestalt principles provide a framework for understanding how humans perceive objects as unified wholes within their context. These principles are essential in explaining the cognitive processes that make sense of complex visual stimuli by organizing them into coherent groups. One fundamental principle is proximity, which posits that objects located close to each other are perceived as a collective group. For instance, when dots are positioned near one another, the visual system interprets them...
01:12Perceptual Constancy
Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...