Abstract：
:When a portrait is coarsely quantized into blocks, the block structure hides the face, although lower spatial frequencies of the original image sufficient by themselves for recognition are preserved. Recognition can be recovered by blurring the image, or otherwise attenuating the spurious higher spatial frequency components. Harmon and Julesz claim that high spatial frequencies introduced by quantized blocking mask the lower spatial frequencies which convey information about the face, preventing recognition. Here we show that recognition can be enhanced, without decreasing the amplitude of these spurious higher frequencies, by adding further high-frequency noise to the quantized image. This result is clearly at odds with a theory of high-frequency (or critical band) masking. We suggest that the added noise mutes mechanisms which would otherwise impose a block structure on the image, allowing the alternative perceptual organization of the hidden face to reemerge.
journal_name
Naturejournal_title
Natureauthors
Morrone MC,Burr DC,Ross Jdoi
10.1038/305226a0subject
Has Abstractpub_date
1983-09-15 00:00:00pages
226-8issue
5931eissn
0028-0836issn
1476-4687journal_volume
305pub_type
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