Image analysis – Histogram processing – With a gray-level transformation
Patent
1996-07-16
1998-12-08
Rogers, Scott
Image analysis
Histogram processing
With a gray-level transformation
382171, 382264, 382274, 382275, 382266, 348606, 348672, G06T 540, G06T 500, G06K 940, H04N 1409
Patent
active
058481818
ABSTRACT:
In an image processing apparatus, a uniform region whose luminance level change is small is correctly extracted from a noise-containing image. To this end, this image processing apparatus includes an extracting module for extracting a high frequency component of a luminous signal of the image over an entire portion of the image within one screen; histogram generating module for generating a histogram of a luminance level of the luminance signal for one screen on the basis of the output value of the extracting module; coefficient calculating module for analyzing the histogram to calculate a predetermined coefficient indicative of likeness of the uniform region every luminance level; and pixel-position-depending coefficient producing module for establishing a correspondence relationship between the predetermined coefficient calculated by the coefficient calculating module and all of the pixel positions on the image in correspondence to the luminous level of the luminance signal from each of the pixel positions.
REFERENCES:
patent: 5450502 (1995-09-01), Eschbach et al.
patent: 5680477 (1997-10-01), Asada
Kananen Ronald P.
Rogers Scott
Sony Corporation
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