Apparatus for improving fogged image using user-controllable root operator

Patent metadata

Field	Value
Publication number	US-9384532-B2
Application number	US-201314425901-A
Country	US
Kind code	B2
Filing date	Nov 5, 2013
Priority date	May 28, 2013
Publication date	Jul 5, 2016
Grant date	Jul 5, 2016

Abstract

An apparatus for improving fogged image using user-controllable root operator comprises an atmosphere brightness value calculation unit for receiving a fogged input image and calculating the value of the brightest pixel of the atmosphere, a transmission calculation unit for calculating the lower bound of transmission rate by using the pixel value calculated by the atmosphere brightness value calculation unit and the fogged input image, and calculating the transmission rate for each pixel by computation processing of power operation with the lower bound of transmission rate according to the user control value, a restoration image computation unit for outputting restored image in which the fog is removed by using the transmission rate calculated by the transmission rate computation unit and the fogged input image, and a post-processing unit for outputting a fog-eliminated image by performing brightness stretching or color processing.

First claim

What is claimed is:

1. An apparatus for improving fogged image by using user-controllable root operator, comprising:
an atmosphere brightness value calculation processor calculating an atmospheric brightness value (I ∞ ), wherein the atmospheric brightness value (I ∞ ) is a value of a brightest pixel in a fogged input image (I(x)) acquired by a camera;
a transmission rate calculation processor including
a lower bound calculation module calculating a lower bound of a transmission rate for each pixel of the fogged input image by using the atmospheric brightness value (I ∞ ) calculated by the atmosphere brightness value calculation processor and the fogged input image (I(x)) for said each pixel, wherein the lower bound of the transmission rate is calculated by a first equation of

1
-

I
⁡

(
x
)

I
∞

,

 wherein x is an x th -pixel, and
a transmission rate calculation module calculating the transmission rate t(x) for said each pixel of the fogged input image (I(x)) by using the lower bound of the transmission rate and a control value (C), wherein the transmission rate (t(x)) is calculated by a second equation of

t
⁡

(
x
)

=

[

1
-

I
⁡

(
x
)

I
∞

]

c

,

0
≤
C
<
1

,

 and
wherein C is a constant value selected by a user;
a restoration image calculation processor outputting a fog-eliminated image (J(x)) for said each pixel by using the transmission rate (t(x)) for said each pixel calculated by the transmission rate calculation processor, the control value (C) and the atmospheric brightness value (I 28 ); and
a post-processing processor outputting a fog-eliminated final image by performing brightness stretching or color processing to the fog-eliminated image (J(x)).

2. The apparatus according to claim 1 , wherein the restoration image calculation processor calculating the fog-eliminated image (J(x)) by using a third equation of

J
⁡

(
x
)

=

I
∞

(

1
-

[

1
-

I
⁡

(
x
)

I
∞

]

1
-
c

)

.

Assignees

• Univ Nat Chonnam Ind Found

Inventors

• Hong Sung Hoon
• Lee Jae Won

Classifications

• G06T2207/30192

  Weather; Meteorology · CPC title

• G06F17/10

  Complex mathematical operations {(function generation by table look-up G06F1/03; evaluation of elementary functions by calculation G06F7/544)} · CPC title

• G06T5/70 Primary

  Denoising; Smoothing · CPC title

• G06T5/007

  Physics · mapped topic

• G06T5/002 Primary

  Physics · mapped topic