An imaging device, comprising: an image sensor and an image signal processor, wherein, the image sensor comprises: a photosensitive pixel array, comprising a plurality of photosensitive pixels; and a filter arranged on the photosensitive pixel array, wherein the filter comprises a filter unit array comprising red filter units, blue filter units, and green filter units arranged in a Bayer pattern; each filter unit covers 2 ∗ 2 photosensitive pixels; wherein, the image signal processor is configured to read and process outputs of the photosensitive pixel array of the image sensor to obtain pixel values of merged pixels and to obtain merged images; being characterized in that, each green filter unit comprises a white filter area and a green filter area, the white filter area covers 1, 2, or 3 photosensitive pixels, and remaining photosensitive pixels within the same green filter unit are covered by the green filter area; each red or blue filter unit does not comprise the white filter area, each red filter unit has a same color, each blue filter unit has a same color; the image signal processor is further configured to add outputs of the 2 ∗ 2 photosensitive pixels covered by each filter unit together to generate a merged pixel by: obtaining a first pixel value of the merged pixel by adding outputs of the photosensitive pixels covered by the white filter area together; obtaining a second pixel value of the merged pixel by adding photosensitive pixels covered by the green filter area together; for each blue filter unit, obtaining a pixel value of the merged pixel by adding the 2 ∗ 2 photosensitive pixels covered by the blue filter area; for each red blue filter unit, obtaining a pixel value of the merged pixel by adding the 2 ∗ 2 photosensitive pixels covered by the red filter area; and the image signal processor is further configured to generate a merged image according to the first pixel value of the merged pixel of the G filter unit, the second pixel value of the merged pixel of the G filter unit, the pixel value of the merged pixel of the B filter unit and the pixel value of the merged pixel of the R filter unit. wherein, the image sensor comprises: a photosensitive pixel array, comprising a plurality of photosensitive pixels; and a filter arranged on the photosensitive pixel array, wherein the filter comprises a filter unit array comprising red filter units, blue filter units, and green filter units arranged in a Bayer pattern; each filter unit covers 2 ∗ 2 photosensitive pixels; a photosensitive pixel array, comprising a plurality of photosensitive pixels; and a filter arranged on the photosensitive pixel array, wherein the filter comprises a filter unit array comprising red filter units, blue filter units, and green filter units arranged in a Bayer pattern; each filter unit covers 2 ∗ 2 photosensitive pixels; wherein, the image signal processor is configured to read and process outputs of the photosensitive pixel array of the image sensor to obtain pixel values of merged pixels and to obtain merged images; being characterized in that, each green filter unit comprises a white filter area and a green filter area, the white filter area covers 1, 2, or 3 photosensitive pixels, and remaining photosensitive pixels within the same green filter unit are covered by the green filter area; each red or blue filter unit does not comprise the white filter area, each red filter unit has a same color, each blue filter unit has a same color; the image signal processor is further configured to add outputs of the 2 ∗ 2 photosensitive pixels covered by each filter unit together to generate a merged pixel by: obtaining a first pixel value of the merged pixel by adding outputs of the photosensitive pixels covered by the white filter area together; obtaining a second pixel value of the merged pixel by adding photosensitive pixels covered by the green filter area together; for each blue filter unit, obtaining a pixel value of the merged pixel by adding the 2 ∗ 2 photosensitive pixels covered by the blue filter area; for each red blue filter unit, obtaining a pixel value of the merged pixel by adding the 2 ∗ 2 photosensitive pixels covered by the red filter area; and obtaining a first pixel value of the merged pixel by adding outputs of the photosensitive pixels covered by the white filter area together; obtaining a second pixel value of the merged pixel by adding photosensitive pixels covered by the green filter area together; for each blue filter unit, obtaining a pixel value of the merged pixel by adding the 2 ∗ 2 photosensitive pixels covered by the blue filter area; for each red blue filter unit, obtaining a pixel value of the merged pixel by adding the 2 ∗ 2 photosensitive pixels covered by the red filter area; and the image signal processor is further configured to generate a merged image according to the first pixel value of the merged pixel of the G filter unit, the second pixel value of the merged pixel of the G filter unit, the pixel value of the merged pixel of the B filter unit and the pixel value of the merged pixel of the R filter unit.