System and method for achieving flicker removal without using flicker-independent frame
A de-flicker system includes a compensation gain estimation circuit and a flicker removal circuit. The compensation gain estimation circuit receives a plurality of flicker-dependent frames with sliding bandings, and estimates a compensation gain for each of the plurality of flicker-dependent frames according to the flicker-dependent frames. The flicker removal circuit applies flicker compensation to each of the flicker-dependent frames according to the compensation gain.
1 . A de-flicker system comprising:
a compensation gain estimation circuit, configured to receive a plurality of flicker-dependent frames from a camera module with sliding bandings, and
estimate a compensation gain for each of the plurality of flicker-dependent frames according to the plurality of flicker-dependent frames; and
a flicker removal circuit, configured to apply flicker compensation to said each of the plurality of flicker-dependent frames according to the compensation gain,
wherein the compensation gain estimation circuit derives a plurality of down-scaled frames from the plurality of flicker-dependent frames, respectively, and
estimates the compensation gain for said each of the plurality of flicker-dependent frames according to the plurality of down-scaled frames.
2 . The de-flicker system of claim 1 , wherein the compensation gain estimation circuit utilizes a mathematical model to model the compensation gain, and estimates parameters of the mathematical model according to the plurality of flicker-dependent frames.
3 . The de-flicker system of claim 1 , wherein the compensation gain estimation circuit utilizes a neural network to estimate the compensation gain.
4 . The de-flicker system of claim 1 , wherein the flicker removal circuit applies the flicker compensation to each row included in said each of the plurality of flicker-dependent frames.
5 . The de-flicker system of claim 1 , wherein the flicker removal circuit applies the flicker compensation to only a portion of rows included in said each of the plurality of flicker-dependent frames.
6 . The de-flicker system of claim 1 , wherein the flicker removal circuit utilizes a neural network to control the flicker compensation applied to said each of the plurality of flicker-dependent frames.
7 . The de-flicker system of claim 1 , wherein the compensation gain estimation circuit receives the plurality of flicker-dependent frames from the camera module operating under a regular single-exposure mode.
8 . The de-flicker system of claim 1 , wherein the compensation gain estimation circuit receives the plurality of flicker-dependent frames from the camera module operating under a dual-gain high dynamic range (DG-HDR) mode.
9 . The de-flicker system of claim 1 , wherein the compensation gain estimation circuit receives the plurality of flicker-dependent frames from the camera module operating under a high dynamic range (HDR) mode with no flicker-independent frame.
10 . A de-flicker method comprising:
receiving a plurality of flicker-dependent frames from a camera module with sliding bandings;
estimating a compensation gain for each of the plurality of flicker-dependent frames according to the plurality of flicker-dependent frames; and
applying flicker compensation to said each of the plurality of flicker-dependent frames according to the compensation gain,
wherein estimating the compensation gain for said each of the plurality of flicker-dependent frames according to the plurality of flicker-dependent frames comprises:
deriving a plurality of down-scaled frames from the plurality of flicker-dependent frames, respectively; and
estimating the compensation gain for said each of the plurality of flicker-dependent frames according to the plurality of down-scaled frames.
11 . The de-flicker method of claim 10 , wherein estimating the compensation gain for said each of the plurality of flicker-dependent frames according to the plurality of flicker-dependent frames comprises:
utilizing a mathematical model to model the compensation gain; and
estimating parameters of the mathematical model according to the plurality of flicker-dependent frames.
12 . The de-flicker method of claim 10 , wherein estimating the compensation gain for said each of the plurality of flicker-dependent frames according to the plurality of flicker-dependent frames comprises:
utilizing a neural network to estimate the compensation gain.
13 . The de-flicker method of claim 10 , wherein applying the flicker compensation to said each of the plurality of flicker-dependent frames according to the compensation gain comprises:
applying the flicker compensation to each row included in said each of the plurality of flicker-dependent frames.
14 . The de-flicker method of claim 10 , wherein applying the flicker compensation to said each of the plurality of flicker-dependent frames according to the compensation gain
applying the flicker compensation to only a portion of rows included in said each of the plurality of flicker-dependent frames.
15 . The de-flicker method of claim 10 , wherein applying the flicker compensation to said each of the plurality of flicker-dependent frames according to the compensation gain comprises:
utilizing a neural network to control the flicker compensation applied to said each of the plurality of flicker-dependent frames.
16 . The de-flicker method of claim 10 , wherein receiving the plurality of flicker-dependent frames with sliding bandings comprises: receiving the plurality of flicker-dependent frames that are output from the camera module operating under a regular single-exposure mode.
17 . The de-flicker method of claim 10 , wherein receiving the plurality of flicker-dependent frames with sliding bandings comprises:
receiving the plurality of flicker-dependent frames that are output from the camera module operating under a dual-gain high dynamic range (DG-HDR) mode.
18 . The de-flicker method of claim 10 , wherein receiving the plurality of flicker-dependent frames with sliding bandings comprises:
receiving the plurality of flicker-dependent frames that are output from the camera module operating under a high dynamic range (HDR) mode with no flicker-independent frame.