a pixel array, comprising multiple pixel columns, each of the pixel columns comprising multiple pixels arranged in the along-track direction, and two adjacent pixels of each of the pixel columns having a separation space therebetween, wherein the multiple pixels of each of the pixel columns comprise multiple normal pixels and at least one reserved pixel, and the separation space comprises a multiplication of a pixel height in the along-track direction by a time ratio of a line time difference of the rolling shutter and a frame period of capturing the image frame; and

multiple integrators, respectively coupled to the multiple pixel columns, and each of the multiple integrators being configured to integrate pixel data of the multiple normal pixels at a corresponding pixel column,

wherein when the multiple normal pixels have a defect pixel, the integrator corresponding to a pixel column of the defect pixel integrates pixel data of the reserved pixel to replace pixel data of the defect pixel.