Image compensation system for fixed image noise
An image noise and compensation system technology, applied in the field of image compensation, can solve the problems of fixed image noise asymmetry, residual fixed image noise, etc.
Pending Publication Date: 2022-02-22
REALTEK SEMICON CORP
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[0004] However, the fixed image noise may have a non-uniformity problem. For example, when the lens and image sensor in the image capture device are poor, the fixed image noise may be asymmetrical, and the fixed image noise may not be symmetrical. It is not limited to left-right or up-down asymmetry. In severe cases, fixed image noise asymmetry will be generated in both up and down and left and right.
[0005] There is an image compensation technology in the prior art, which can be called fixed pattern noise correction (fixed pattern noise correction, FPNC). This grid-based fixed pattern noise correction technology compensates according to the image area. However, the entire image will still have residual fixed image noise
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[0051] The implementation of the present invention is described below through specific specific examples, and those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various modifications and adjustments can be made to the details in this specification based on different viewpoints and applications without departing from the concept of the present invention. In addition, it is stated in advance that the drawings of the present invention are only for simple illustration and are not drawn according to the actual size. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invention.
[0052] It should be understood that although terms such as "first"...
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An image compensation system for fixed image noise is suitable for a 4-pixel sensor and can automatically calculate appropriate fixed image noise compensation parameters according to asymmetry of the sensor and a lens. Aiming at asymmetric fixed image noise possibly caused by flaws of a sensor or a lens, in a system operation method, an image is firstly segmented into a plurality of grids, pixel average values of channels in the grids are calculated, fixed image noise compensation coefficients of pixels are calculated according to characteristics of forming the image by a 4-pixel sensor, and the compensation coefficient of the current pixel can be obtained through extrapolation and interpolation, so that the fixed image noise in the image can be corrected.
Description
technical field [0001] The invention provides an image compensation technology, in particular to an image compensation system for an image sensor that generates fixed image noise. Background technique [0002] A fixed pattern noise (FPN) occurs in the image. One of the reasons is that the digital imaging sensor tends to produce noise with higher brightness relative to the background at the position of a specific pixel under long-time exposure. . Taking photos as an example, even when shooting images of different scenes, noises with different brightness relative to the background will be found in fixed positions in the photos. This type of noise can be divided into two categories: one is dark signal non-uniformity (Dark Signal Non-Uniformity, DSNU), the other is photoresponse non-uniformity (Photo Response Non-Uniformity, PRNU). The dark signal non-uniformity (DSNU) is the fixed image noise (FPN) detected after the lens is blacked out, and the photoresponse non-uniformity (...
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IPC IPC(8): H04N5/365
CPCH04N25/677
Inventor 陈彦锋黄文聪
Owner REALTEK SEMICON CORP