Method of adjusting image pixel values within an image sequence

Details Method of adjusting image pixel values within an image sequence Method of adjusting image pixel values within an image sequence

1996-12-19

1998-08-11

Mancuso, Joseph

Image analysis

Histogram processing

With a gray-level transformation

358458, 348700, G06K 900

Patent

active

057938865

ABSTRACT:
A method of interpolating a reference cumulative histogram for a source image located within an image sequence, the reference cumulative histogram to be used to adjust image pixel code values of the source image to remove unwanted variations in color or tone, e.g. "flicker", while preserving an intended variation, e.g. "fade to black" in the color or tone occurring during the course of the image sequence. The method employs conversion of cumulative histograms derived from reference image frames at opposite ends of the image sequence into inverse cumulative histograms and the weighted averaging of these inverse cumulative histogram values based on the time location of the source image frame in the sequence to derive an interpolated inverse cumulative histogram which is then converted into the reference cumulative histogram used for adjusting pixel code values, for example by histogram matching, to remove the undesired variation in color or tone without loss of the intentional variation in color or tone.

REFERENCES:
patent: 5008739 (1991-04-01), D'Luna et al.
patent: 5296941 (1994-03-01), Izawa et al.
patent: 5315389 (1994-05-01), Izawa et al.
patent: 5388168 (1995-02-01), Sakashita et al.
patent: 5490222 (1996-02-01), Sugimoto
patent: 5495428 (1996-02-01), Schwartz

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