Imaging apparatus
First Claim
1. An imaging apparatus including an infrared video camera comprising a sensor array and operable to produce successive video images in the form of pixelated two-dimensional images, the imaging apparatus further comprising a processing arrangement operable to reduce or increase an overall brightness of an enhanced image in dependence upon an overall brightness of a pre-enhanced image and an overall brightness of a preceding enhanced image, so that a change in the overall brightness between the enhanced image and the preceding enhanced image is decreased to be less than a difference in overall brightness between the pre-enhanced image and the preceding enhanced image;
- wherein the output at time t is calculated using
fout(x,y,t)=f(x,y,t)+γ
·
DCresidual(t)
(1)where
DCresidual(t)=DCout(t)−
DCf(t)
(2)DCf(t) being a mean brightness of the pre-enhanced image and
DCout(t)=(1−
λ
)·
DCout(t−
1)+λ
·
DCf(t)
(3)where γ
is a parameter controlling a strength compensation and λ
is a parameter determining an adaptation rate of the compensation.
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Accused Products
Abstract
An imaging apparatus including an infrared video camera. The infrared video camera includes a sensor array operable to produce successive video images in the form of pixelated two-dimensional images. The imaging apparatus further comprises a processing arrangement operable to reduce or increase the overall brightness of an image in dependence upon the overall brightness of the pre-enhanced image and the overall brightness of the preceding enhanced image, so that the change in the overall brightness (DC-level) between the enhanced image and the preceding enhanced image is decreased.
11 Citations
6 Claims
-
1. An imaging apparatus including an infrared video camera comprising a sensor array and operable to produce successive video images in the form of pixelated two-dimensional images, the imaging apparatus further comprising a processing arrangement operable to reduce or increase an overall brightness of an enhanced image in dependence upon an overall brightness of a pre-enhanced image and an overall brightness of a preceding enhanced image, so that a change in the overall brightness between the enhanced image and the preceding enhanced image is decreased to be less than a difference in overall brightness between the pre-enhanced image and the preceding enhanced image;
-
wherein the output at time t is calculated using
fout(x,y,t)=f(x,y,t)+γ
·
DCresidual(t)
(1)where
DCresidual(t)=DCout(t)−
DCf(t)
(2)DCf(t) being a mean brightness of the pre-enhanced image and
DCout(t)=(1−
λ
)·
DCout(t−
1)+λ
·
DCf(t)
(3)where γ
is a parameter controlling a strength compensation and λ
is a parameter determining an adaptation rate of the compensation.- View Dependent Claims (2, 3, 4)
-
-
5. An image enhancement method applicable to infrared video images characterised in that, for each video image received by a processor, an overall brightness of an enhanced image is reduced or increased by the processor in dependence upon an overall brightness of a pre-enhanced image and an overall brightness of a preceding enhanced image;
-
wherein the output at time t is calculated using
fout(x,y,t)=f(x,y,t)+γ
·
DCresidual(t)
(1)where
DCresidual(t)=DCout(t)−
DCf(t)
(2)DCf(t) being the mean of the pre-enhanced image and
DCout(t)=(1−
λ
)·
DCout(t−
1)+λ
·
DCf(t)
(3)where γ
is a parameter controlling a strength compensation and λ
is a parameter determining an adaptation rate of the compensation.- View Dependent Claims (6)
-
Specification