Image contrast enhancement technique

Details Image contrast enhancement technique Image contrast enhancement technique

1988-10-24

1991-11-05

Razavi, Michael

Image analysis

Histogram processing

For setting a threshold

382 51, 382 52, 382 53, 358166, 358169, G06K 938

Patent

active

050636073

ABSTRACT:
An image contrast enhancement technique for use in a forward looking infrared system adapted to adjust the intensity of an image of a scene, the image being realized from electrical signals generated in response to radiation received from a plurality of regions within a field of view of the scene. The technique includes the step of filling a first matrix with digital entries corresponding to each electrical signal, the difference between the maximum and minimum digital entries defining a first dynamic range. The first matrix is sampled to create a set of digital entries having a second dynamic range substantially similar to the first dynamic range. A histogram of the set of digital entries is then constructed. A first transfer function is generated by at least approximating the integral of the histogram, the first transfer function having a value at each of the digital entries. The technique further includes the step of generating a second matrix having entries obtained by multiplying each of the entries of the first matrix by the value of the first transfer function at each of the entries. The image of the scene is generated by driving a display with signals derived from the entries of the second matrix.

REFERENCES:
patent: 4365304 (1982-12-01), Ruhman et al.
patent: 4695884 (1987-09-01), Anastassiou et al.
patent: 4783828 (1988-11-01), Sadgadi

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