constancy


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constancy

 [kon´stan-se]
the quality of remaining stable or unaltered.
form constancy the ability to recognize forms and objects as the same in spite of variation in environment, position, and size.
object constancy the capacity to understand that an absent person or object exists and will return.

con·stan·cy

(kon'stan-sē),
The quality of being unchanging
[L. constantia, fr. consto, to stand still]

con·stan·cy

(kon'stăn-sē)
The quality of being constant.
[L. constantia, fr. consto, to stand still]

constancy 

Perceptual phenomenon whereby the properties of certain objects appear to remain relatively constant, despite changes in the stimulus characteristics which induced the perception. All constancies occur only within a limited range.
brightness constancy Perceptual phenomenon whereby the brightness of an object appears to remain relatively constant, despite changes in the level of its illumination. Example: white paper appears white whether it is seen in sunlight or in the weaker or yellower illumination of a light bulb. Syn. lightness constancy.
colour constancy Perceptual phenomenon whereby the colour of an object appears to remain relatively constant, despite changes in the spectral composition of the incident light.
shape constancy Perceptual phenomenon whereby the shape of an object appears to remain relatively constant, despite changes in the viewing angle. Example: A circle held obliquely to the line of sight appears more circular than it should due to shape constancy although its retinal projection is oval.
size constancy Perceptual phenomenon whereby the size of an object appears to remain relatively constant, despite changes in the viewing distance (and therefore of its retinal image size).
References in periodicals archive ?
The white balance method[9] is one of the main light source estimation methods based on color constancy, and it assumes that there are achromatic colors in images.
Instigated once again by Benwick's new attachment, Persuasion s culminating debate on constancy of the heart receives its fullest and most conceptual canvassing in Anne and Harville's conversation at the White Hart.
Four dependent variables were included in the analysis: total mental toughness (SMTQ Tot); control (SMTQ Cnt); constancy (SMTQ Cst) and confidence (SMTQ Cnf).
Supposing loyalty and faith can be enmeshed within repetition, which in turn contributes to a sense of constancy. How does this relate to my client's expression of self-harm?
A recently published colour constancy method [ 11] reported far better results.
In its most damaging form, the fallacy dismisses essential aspects of true time by quietly disposing of constancy (labeling it as timeless) and/or quietly disposing of change (labeling it as lower/subjective or unreal).
The value of constancy depends on the brain's effectiveness in managing the changeableness of its inputs, whereas it can only identify a significant change against a background of constancy.
"Constancy," Tarpley writes, "is the foundation of Fanny's daily practice of her religious principles and the growth of consciousness that represents her inner spiritual nature" (11).
They cover color fundamentals, photometric invariance, color constancy, extracting color features, and applications.
(2007) with impulse indicator saturation (IIS)--a new generic procedure for evaluating parameter constancy, which is a central element in model-based forecasting.
It is this - the Queen's 60 years on the throne exemplify the virtue of constancy and this is a virtue that is essential to anything and everything that is of value to us.
In philosophy, perceptual constancy refers to the puzzling phenomenon of the perception of properties of objects despite our changing experience of those properties.