Day-night switching method, electronic device, and storage medium
View Patent ↗A day-night switching method includes determining image illumination according to a photographed image acquired by a camera device; in the case where the image illumination is greater than the current black-to-color switching threshold, determining an image illumination influence factor according to the photographed image; in the case where the image illumination influence factor is environmental illumination, controlling the camera device to perform day-night switching according to the image illumination and the current black-to-color switching threshold; in the case where the image illumination influence factor is a fill light, determining a new black-to-color switching threshold according to the photographing parameter of the camera device and the photographed image; and controlling the camera device to perform day-night switching according to the image illumination and the new black-to-color switching threshold.
1 . A day-night switching method, comprising:
determining image illumination according to a photographed image acquired by a camera device;
in response to the image illumination being greater than a current black-to-color switching threshold, determining an image illumination influence factor according to the photographed image;
in response to the image illumination influence factor being environmental illumination, controlling the camera device to perform day-night switching according to the image illumination and the current black-to-color switching threshold; and
in response to the image illumination influence factor being a fill light, determining a new black-to-color switching threshold according to a photographing parameter of the camera device and the photographed image, and controlling the camera device to perform day-night switching according to the image illumination and the new black-to-color switching threshold.
2 . The method according to claim 1 , before determining the image illumination influence factor according to the photographed image, further comprising:
determining whether the image illumination changes; and
in response to the image illumination not changing, controlling the camera device to perform the day-night switching according to the image illumination and the current black-to-color switching threshold,
wherein determining the image illumination influence factor according to the photographed image comprises:
in response to the image illumination changing, determining the image illumination influence factor according to the photographed image;
wherein determining whether the image illumination changes comprises:
calculating a change amplitude of the image illumination compared with historical image illumination acquired last time and determining whether the change amplitude is greater than or equal to a first change amplitude threshold;
in response to the image illumination not changing comprises:
in response to the change amplitude being less than the first change amplitude threshold; and
in response to the image illumination changing comprises:
in response to the change amplitude being greater than or equal to the first change amplitude threshold;
or
wherein determining whether the image illumination changes comprises:
calculating a change amplitude of the image illumination compared with an average value of historical image illumination acquired for previous N times and determining whether the change amplitude is greater than or equal to a second change amplitude threshold; and
in response to the image illumination not changing comprises:
in response to the change amplitude being less than the second change amplitude threshold; and
in response to the image illumination changing comprises:
in response to the change amplitude being greater than or equal to the second change amplitude threshold.
3 . The method according to claim 1 , wherein the method further comprising: predetermining an initial value of a black-to-color switching threshold according to the following manners:
in a dark room scenario, in a case where the camera device is configured to be in a night mode, and the fill light is turned on, environment brightness is increased; and in a case where image quality of an image acquired by the camera device satisfies a preset image quality requirement after removing a fill light factor, acquiring a current environmental illumination value as the initial value of the black-to-color switching threshold.
4 . The method according to claim 1 , wherein determining the image illumination influence factor according to the photographed image comprises:
determining a first attenuation factor used for indicating uniformity of brightness of a central region in the photographed image and brightness of an edge region in the photographed image according to the photographed image;
determining a second attenuation factor used for indicating uniformity of brightness of a center point in the photographed image and brightness of four corner positions in the photographed image according to the photographed image; and
determining the image illumination influence factor according to the first attenuation factor and the second attenuation factor.
5 . The method according to claim 1 , wherein determining the image illumination influence factor according to the photographed image comprises:
determining a first attenuation factor of the photographed image according to brightness of a central region in the photographed image and brightness of an edge region in the photographed image;
determining a second attenuation factor of the photographed image according to brightness of a center point in the photographed image and brightness of four corner positions in the photographed image;
in a case where the first attenuation factor of the photographed image is less than a pre-calibrated first attenuation factor of an image without fill light of the camera device, and the second attenuation factor of the photographed image is less than a pre-calibrated second attenuation factor of the image without the fill light of the camera device, determining that the image illumination influence factor is the fill light; and
in a case where the first attenuation factor of the photographed image is greater than or equal to the pre-calibrated first attenuation factor of the image without the fill light of the camera device, or the second attenuation factor of the photographed image is greater than or equal to the pre-calibrated second attenuation factor of the image without the fill light of the camera device, determining that the image illumination influence factor is the environmental illumination.
6 . The method according to claim 5 , wherein
the first attenuation factor D side of the photographed image is calculated in the following manner:
D
side
=
(
2
m
+
2
n
-
4
)
×
∑
i
=
-
1
1
∑
j
=
-
1
1
Y
(
(
m
2
+
i
)
,
(
n
2
+
j
)
)
9
×
(
∑
i
=
1
m
(
Y
i
1
+
Y
in
)
+
∑
j
=
1
n
(
Y
1
j
+
Y
mj
)
)
;
and
the second attenuation factor D corner of the photographed image is calculated in the following manner:
D
corner
=
4
×
Y
m
/
2
,
n
/
2
∑
i
=
1
,
m
∑
j
=
1
,
n
Y
ij
,
wherein the photographed image is divided into m×n blocks, Y ij denotes average brightness of a block at an i-th row and a j-th column, and m and n are integers greater than 1.
7 . The method according to claim 5 , wherein determining the new black-to-color switching threshold according to the photographing parameter of the camera device and the photographed image comprises:
determining a first black-to-color switching threshold factor according to the first attenuation factor of the photographed image, the second attenuation factor of the photographed image, and a preset adjustment parameter;
determining a second black-to-color switching threshold factor according to brightness of the fill light and a device gain in the photographing parameter; and
determining the new black-to-color switching threshold according to the first black-to-color switching threshold factor, the second black-to-color switching threshold factor, and the current black-to-color switching threshold.
8 . The method according to claim 7 , wherein
the first black-to-color switching threshold factor φ(D side , D corner ) is determined according to the following formula:
φ
(
D
side
,
D
corner
)
=
1
(
α
(
D
side
❘
"\[LeftBracketingBar]"
D
max
side
-
D
min
side
❘
"\[RightBracketingBar]"
)
+
(
1
-
α
)
(
D
corner
❘
"\[LeftBracketingBar]"
D
max
corner
-
D
min
corner
❘
"\[RightBracketingBar]"
)
)
,
wherein D side denotes the first attenuation factor of the photographed image, D corner denotes the second attenuation factor of the photographed image, and α denotes the preset adjustment parameter, wherein 0≤α≤1;
Dmax side denotes a pre-calibrated first attenuation factor of a strongest fill light image of the camera device, and Dmin side denotes a pre-calibrated first attenuation factor of a weakest fill light image of the camera device;
Dmax corner denotes a pre-calibrated second attenuation factor of a strongest fill light image of the camera device, and Dmin corner denotes a pre-calibrated second attenuation factor of a weakest fill light image of the camera device; and
the second black-to-color switching threshold factor F(L, Gain) is determined according to the following attenuation function obtained by pre-fitting:
F
(
L
,
Gain
)
=
A
1
×
(
Gain
2
)
+
A
0
B
1
×
log
B
(
L
10
+
1
)
,
wherein L denotes the brightness of the fill light, Gain denotes the device gain, and A1, A0, B1, and B are constants obtained by pre-fitting, wherein A1<0, B>1, B1>0, and A0>0; and
the new black-to-color switching threshold is determined according to the following formula:
T
n
2
d
-
new
=
φ
(
D
side
,
D
corner
)
×
F
(
L
,
Gain
)
×
T
n
2
d
,
wherein T n2d denotes the current black-to-color switching threshold, and T n2d-new denotes the new black-to-color switching threshold.
9 . An electronic device, comprising:
at least one processor; and
a storage apparatus configured to store at least one program;
wherein when executing the at least one program, the at least one processor is instructed to perform a day-night switching method;
wherein the method comprising:
determining image illumination according to a photographed image acquired by a camera device;
in response to the image illumination being greater than a current black-to-color switching threshold, determining an image illumination influence factor according to the photographed image;
in response to the image illumination influence factor being environmental illumination, controlling the camera device to perform day-night switching according to the image illumination and the current black-to-color switching threshold; and
in response to the image illumination influence factor being a fill light, determining a new black-to-color switching threshold according to a photographing parameter of the camera device and the photographed image, and controlling the camera device to perform day-night switching according to the image illumination and the new black-to-color switching threshold.
10 . The electronic device according to claim 9 , wherein before determining the image illumination influence factor according to the photographed image, the method further comprising:
determining whether the image illumination changes; and
in response to the image illumination not changing, controlling the camera device to perform the day-night switching according to the image illumination and the current black-to-color switching threshold,
wherein determining the image illumination influence factor according to the photographed image comprises:
in response to the image illumination changing, determining the image illumination influence factor according to the photographed image;
wherein determining whether the image illumination changes comprises:
calculating a change amplitude of the image illumination compared with historical image illumination acquired last time and determining whether the change amplitude is greater than or equal to a first change amplitude threshold;
in response to the image illumination not changing comprises:
in response to the change amplitude being less than the first change amplitude threshold; and
in response to the image illumination changing comprises:
in response to the change amplitude being greater than or equal to the first change amplitude threshold;
or
wherein determining whether the image illumination changes comprises:
calculating a change amplitude of the image illumination compared with an average value of historical image illumination acquired for previous N times and determining whether the change amplitude is greater than or equal to a second change amplitude threshold; and
in response to the image illumination not changing comprises:
in response to the change amplitude being less than the second change amplitude threshold; and
in response to the image illumination changing comprises:
in response to the change amplitude being greater than or equal to the second change amplitude threshold.
11 . The electronic device according to claim 9 , wherein the method further comprising: predetermining an initial value of a black-to-color switching threshold according to the following manners:
in a dark room scenario, in a case where the camera device is configured to be in a night mode, and the fill light is turned on, environment brightness is increased; and in a case where image quality of an image acquired by the camera device satisfies a preset image quality requirement after removing a fill light factor, acquiring a current environmental illumination value as the initial value of the black-to-color switching threshold.
12 . The electronic device according to claim 9 , wherein determining the image illumination influence factor according to the photographed image comprises:
determining a first attenuation factor used for indicating uniformity of brightness of a central region in the photographed image and brightness of an edge region in the photographed image according to the photographed image;
determining a second attenuation factor used for indicating uniformity of brightness of a center point in the photographed image and brightness of four corner positions in the photographed image according to the photographed image; and
determining the image illumination influence factor according to the first attenuation factor and the second attenuation factor.
13 . The electronic device according to claim 9 , wherein determining the image illumination influence factor according to the photographed image comprises:
determining a first attenuation factor of the photographed image according to brightness of a central region in the photographed image and brightness of an edge region in the photographed image;
determining a second attenuation factor of the photographed image according to brightness of a center point in the photographed image and brightness of four corner positions in the photographed image;
in a case where the first attenuation factor of the photographed image is less than a pre-calibrated first attenuation factor of an image without fill light of the camera device, and the second attenuation factor of the photographed image is less than a pre-calibrated second attenuation factor of the image without the fill light of the camera device, determining that the image illumination influence factor is the fill light; and
in a case where the first attenuation factor of the photographed image is greater than or equal to the pre-calibrated first attenuation factor of the image without the fill light of the camera device, or the second attenuation factor of the photographed image is greater than or equal to the pre-calibrated second attenuation factor of the image without the fill light of the camera device, determining that the image illumination influence factor is the environmental illumination.
14 . The electronic device according to claim 13 , wherein
the first attenuation factor D side of the photographed image is calculated in the following manner:
D
side
=
(
2
m
+
2
n
-
4
)
×
∑
i
=
-
1
1
∑
j
=
-
1
1
Y
(
(
m
2
+
i
)
,
(
n
2
+
j
)
)
9
×
(
∑
i
=
1
m
(
Y
i
1
+
Y
in
)
+
∑
j
=
1
n
(
Y
1
j
+
Y
mj
)
)
;
and
the second attenuation factor D corner of the photographed image is calculated in the following manner:
D
corner
=
4
×
Y
m
/
2
,
n
/
2
∑
i
=
1
,
m
∑
j
=
1
,
n
Y
ij
,
wherein the photographed image is divided into m×n blocks, Y ij denotes average brightness of a block at an i-th row and a j-th column, and m and n are integers greater than 1.
15 . The electronic device according to claim 13 , wherein determining the new black-to-color switching threshold according to the photographing parameter of the camera device and the photographed image comprises:
determining a first black-to-color switching threshold factor according to the first attenuation factor of the photographed image, the second attenuation factor of the photographed image, and a preset adjustment parameter;
determining a second black-to-color switching threshold factor according to brightness of the fill light and a device gain in the photographing parameter; and
determining the new black-to-color switching threshold according to the first black-to-color switching threshold factor, the second black-to-color switching threshold factor, and the current black-to-color switching threshold.
16 . The electronic device according to claim 15 , wherein
the first black-to-color switching threshold factor φ(D side , D corner ) is determined according to the following formula:
φ
(
D
side
,
D
corner
)
=
1
(
α
(
D
side
❘
"\[LeftBracketingBar]"
D
max
side
-
D
min
side
❘
"\[RightBracketingBar]"
)
+
(
1
-
α
)
(
D
corner
❘
"\[LeftBracketingBar]"
D
max
corner
-
D
min
corner
❘
"\[RightBracketingBar]"
)
)
,
wherein D side denotes the first attenuation factor of the photographed image, D corner denotes the second attenuation factor of the photographed image, and α denotes the preset adjustment parameter, wherein 0≤α≤1;
Dmax side denotes a pre-calibrated first attenuation factor of a strongest fill light image of the camera device, and Dmin side denotes a pre-calibrated first attenuation factor of a weakest fill light image of the camera device;
Dmax corner denotes a pre-calibrated second attenuation factor of a strongest fill light image of the camera device, and Dmin corner denotes a pre-calibrated second attenuation factor of a weakest fill light image of the camera device; and
the second black-to-color switching threshold factor F(L, Gain) is determined according to the following attenuation function obtained by pre-fitting:
F
(
L
,
Gain
)
=
A
1
×
(
Gain
2
)
+
A
0
B
1
×
log
B
(
L
10
+
1
)
,
wherein L denotes the brightness of the fill light, Gain denotes the device gain, and A1, A0, B1, and B are constants obtained by pre-fitting, wherein A1<0, B>1, B1>0, and A0>0; and
the new black-to-color switching threshold is determined according to the following formula:
T
n
2
d
-
new
=
φ
(
D
side
,
D
corner
)
×
F
(
L
,
Gain
)
×
T
n
2
d
,
wherein T n2d denotes the current black-to-color switching threshold, and T n2d-new denotes the new black-to-color switching threshold.
17 . A non-transitory computer-readable storage medium, storing a computer program, wherein when executing the program, a processor is instructed to perform a day-night switching method;
wherein the method comprising:
determining image illumination according to a photographed image acquired by a camera device;
in response to the image illumination being greater than a current black-to-color switching threshold, determining an image illumination influence factor according to the photographed image;
in response to the image illumination influence factor being environmental illumination, controlling the camera device to perform day-night switching according to the image illumination and the current black-to-color switching threshold; and
in response to the image illumination influence factor being a fill light, determining a new black-to-color switching threshold according to a photographing parameter of the camera device and the photographed image, and controlling the camera device to perform day-night switching according to the image illumination and the new black-to-color switching threshold.
18 . The non-transitory computer-readable storage medium according to claim 17 , before determining the image illumination influence factor according to the photographed image, further comprising:
determining whether the image illumination changes; and
in response to the image illumination not changing, controlling the camera device to perform the day-night switching according to the image illumination and the current black-to-color switching threshold,
wherein determining the image illumination influence factor according to the photographed image comprises:
in response to the image illumination changing, determining the image illumination influence factor according to the photographed image;
wherein determining whether the image illumination changes comprises:
calculating a change amplitude of the image illumination compared with historical image illumination acquired last time and determining whether the change amplitude is greater than or equal to a first change amplitude threshold;
in response to the image illumination not changing comprises:
in response to the change amplitude being less than the first change amplitude threshold; and
in response to the image illumination changing comprises:
in response to the change amplitude being greater than or equal to the first change amplitude threshold;
or
wherein determining whether the image illumination changes comprises:
calculating a change amplitude of the image illumination compared with an average value of historical image illumination acquired for previous N times and determining whether the change amplitude is greater than or equal to a second change amplitude threshold; and
in response to the image illumination not changing comprises:
in response to the change amplitude being less than the second change amplitude threshold; and
in response to the image illumination changing comprises:
in response to the change amplitude being greater than or equal to the second change amplitude threshold.
19 . The non-transitory computer-readable storage medium according to claim 17 , wherein the method further comprising: predetermining an initial value of a black-to-color switching threshold according to the following manners:
in a dark room scenario, in a case where the camera device is configured to be in a night mode, and the fill light is turned on, environment brightness is increased; and in a case where image quality of an image acquired by the camera device satisfies a preset image quality requirement after removing a fill light factor, acquiring a current environmental illumination value as the initial value of the black-to-color switching threshold.
20 . The non-transitory computer-readable storage medium according to claim 17 , wherein determining the image illumination influence factor according to the photographed image comprises:
determining a first attenuation factor used for indicating uniformity of brightness of a central region in the photographed image and brightness of an edge region in the photographed image according to the photographed image;
determining a second attenuation factor used for indicating uniformity of brightness of a center point in the photographed image and brightness of four corner positions in the photographed image according to the photographed image; and
determining the image illumination influence factor according to the first attenuation factor and the second attenuation factor.