For other uses, see Superimposition (disambiguation).
Not to be confused with Superposition.
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Superimposition is the placement of one thing over another, typically so that both are still evident.
Contents
1Graphics
2Cartography
32D images
4Audio
5Further reading
6References
Graphics
In graphics, superimposition is the placement of an image or video on top of an already-existing image or video, usually to add to the overall image effect, but also sometimes to conceal something (such as when a different face is superimposed over the original face in a photograph).
Cartography
This technique is used in cartography to produce photomaps by superimposing grid lines, contour lines and other linear or textual mapping features over aerial photographs.
2D images
Superimposition of two-dimensional images containing correlated periodic grid structures may produce moiré patterns. Superimposition of two correlated layers comprising parallel lines or curves may give rise line moiré patterns. The movement of one of the layers results in a faster movement of the line moiré superimposition image. Such optical acceleration is known as moiré speedup (check for the formulas of optical speedup for curved patterns). When superimposing two identical layers comprising randomly spaced parallel lines, at a small angle or with a small scaling difference random line moiré patterns,[1] namely line Glass patterns (after Leon Glass, 1969) appear. Similarly, when superimposing two identical layers of randomly scattered dots at a small angle or with a small scaling difference random dot Glass patterns, namely random dot moiré,[2] appears. When one of the layers embeds complex shapes, such as sequences of symbols forming a text, and another layer contains parallel lines or curves, the superimposition image may give rise to magnified shapes, called shape moiré patterns.
Audio
Superimposition (SI) during sound recording and reproduction (commonly called overdubbing) is the process of adding new sounds over existing without completely erasing or masking the existing sound. Some reel-to-reel tape recorders of the mid 20th century provided crude superimposition facilities that were implemented by killing the high-frequency AC feed to the erase head while recording as normal via the read-write head.
Look up superimposition in Wiktionary, the free dictionary.
Further reading
Natale, Simone. (2012) A Short History of Superimposition: From Spirit Photography to Early Cinema. Early Popular Visual Culture 10.2: 125–45. doi:10.1080/17460654.2012.664745
References
^"Aperiodic random line moiré". Switzernet.com. 2007-02-27. Retrieved 2017-07-14.
^"Examples of random moiré". Switzernet.com. 2007-02-12. Retrieved 2017-07-14.
UpToDate Contents
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…Due to the subjective nature of this evaluation, it may not be accurate ; The technique used to superimpose the end-systolic silhouette on the end-diastolic silhouette may influence the assessment of regional…
…more severe than upper respiratory infection, otitis media, gastroenteritis); immunization may superimpose vaccine adverse effects on the underlying illness; manifestations of the underlying illness may…
…Administration (FDA) approved indication for botulinum toxin. Phenol and ethanol nerve blocks essentially superimpose a lower motor neuron lesion on the upper motor neuron deficit . Weakness, injection site pain,…
English Journal
Obesity-related glomerulopathy: pathogenesis, pathologic, clinical characteristics and treatment.
Xu T1, Sheng Z1, Yao L2.
Frontiers of medicine.Front Med.2017 Sep;11(3):340-348. doi: 10.1007/s11684-017-0570-3. Epub 2017 Aug 8.
The Function of Kimono in Nagai Kafū's Bokutō Kidan Material Culture Communication: Nostalgia and Time Consciousness Expressed through Kimono and Dress
MACK Karen J
跡見学園女子大学文学部紀要 = Journal of Atomi University, Faculty of Literature (53), 113-138, 2018-03
… Nagai Kafū in his novel, Bokutō Kidan,used a number of methods not to merely evoke the past, but to superimpose it onto the present through sounds, smells, and material objects.As the narrator recounts, "even the foulness of the gully, and the sounds of the mosquitoes,stimulated my senses bringing back a shadowy image of a past. …
su·per·im·pose (so o′pər-ĭm-pōz′) tr.v. su·per·im·posed, su·per·im·pos·ing, su·per·im·pos·es 1. To lay or place (something) on or over ... Using interactive, 3D modeling technology, ShadowChaser 3D allows the student to superimpose ...