Fixed pattern noise elimination method, device, image sensor and electronic equipment

Abstract

The present invention proposes a fixed mode noise elimination method, device, image sensor and electronic equipment, the method includes determining each pixel in the pixel array structure, transmitting the generated image signal to the initial transmission path of the data acquisition module, and obtaining the initial transmission path corresponding to each The initial transmission path corresponding to the pixel; the initial transmission path is converted to obtain the converted transmission path, and the converted transmission path is a path different from the initial transmission path; the image signal generated for each pixel is based on the converted transmission path to collect. The invention can improve the elimination effect of the fixed pattern noise on the column, and only need to add a small additional chip area, so that the product cost is lower.

Description

technical field [0001] The present invention relates to the technical field of image processing, in particular to a fixed pattern noise elimination method, device, image sensor and electronic equipment. Background technique [0002] Fixed pattern noise (Fixed Pattern Noise, FPN) has always been an important factor affecting performance in CMOS image sensors. The reason for the column FPN is that the characteristic parameters of the transistor and the parameters of the passive components are not uniform, the threshold value difference of the internal transistor of the column amplifier of different columns and the bias difference of itself. They appear as vertical streaks in the image. The human eye is particularly sensitive to this kind of noise, so it has a great impact on the image quality of the image sensor. Therefore, effectively reducing the FPN is an important link in the design of the CMOS image sensor. [0003] In the related art, the CMOS image sensor usually adop...

AI Technical Summary

Problems solved by technology

In addition, under the limitation of pixel pitch, the design and placement of column differential amplifiers are more difficult. At the same time, its structure is relatively complex, which will introduce more random noise. Due to the inconsistency of the process, the method of adding dummy pixels to remove FPN must be used Multiple rows of dummy pixels, and matching the corresponding algorithm, will greatly increase the complexity of the system and consume a large chip area

Images