An image sensor, comprising: a pixel group including a first region and a second region; and a color filter having a first color on the pixel group, wherein: the first region includes a plurality of first pixels (LPX1, LPX2, LPX3, LPX4) a first floating diffusion region, each of the plurality of first pixels (LPX1, LPX2, LPX3, LPX4) including a plurality of first sub-pixels (SLPX), each of the plurality of first sub-pixels (SLPX) including a first photodiode and a first transfer transistor connected to the first photodiode and the first floating diffusion region, the second region includes a plurality of second pixels (SPX1, SPX2, SPX3, SPX4) including a second photodiode, a second floating diffusion region, and a second transfer transistor connected to the second photodiode and the second floating diffusion region, each first pixel (LPX1, LPX2, LPX3, LPX4) further includes a connecting transistor connecting the first floating diffusion region and the second floating diffusion region of one of the plurality of second pixels (SPX1, SPX2, SPX3, SPX4), the first pixels (LPX1, LPX2, LPX3, LPX4) and the second pixels (SPX1, SPX2, SPX3, and SPX4) are each arranged in an m*n arrangement, wherein m and n are natural numbers of 2 or more, such that at least four first pixels (LPX1, LPX2, LPX3, LPX4) are in the first region and at least four second pixels (SPX1, SPX2, SPX3, SPX4) are in the second region, in plane view, a total first photodiode area in the first region is greater than a total second photodiode area in the second region. a pixel group including a first region and a second region; and a color filter having a first color on the pixel group, wherein: the first region includes a plurality of first pixels (LPX1, LPX2, LPX3, LPX4) a first floating diffusion region, each of the plurality of first pixels (LPX1, LPX2, LPX3, LPX4) including a plurality of first sub-pixels (SLPX), each of the plurality of first sub-pixels (SLPX) including a first photodiode and a first transfer transistor connected to the first photodiode and the first floating diffusion region, the second region includes a plurality of second pixels (SPX1, SPX2, SPX3, SPX4) including a second photodiode, a second floating diffusion region, and a second transfer transistor connected to the second photodiode and the second floating diffusion region, each first pixel (LPX1, LPX2, LPX3, LPX4) further includes a connecting transistor connecting the first floating diffusion region and the second floating diffusion region of one of the plurality of second pixels (SPX1, SPX2, SPX3, SPX4), the first pixels (LPX1, LPX2, LPX3, LPX4) and the second pixels (SPX1, SPX2, SPX3, and SPX4) are each arranged in an m*n arrangement, wherein m and n are natural numbers of 2 or more, such that at least four first pixels (LPX1, LPX2, LPX3, LPX4) are in the first region and at least four second pixels (SPX1, SPX2, SPX3, SPX4) are in the second region, in plane view, a total first photodiode area in the first region is greater than a total second photodiode area in the second region. the first region includes a plurality of first pixels (LPX1, LPX2, LPX3, LPX4) a first floating diffusion region, each of the plurality of first pixels (LPX1, LPX2, LPX3, LPX4) including a plurality of first sub-pixels (SLPX), each of the plurality of first sub-pixels (SLPX) including a first photodiode and a first transfer transistor connected to the first photodiode and the first floating diffusion region, the second region includes a plurality of second pixels (SPX1, SPX2, SPX3, SPX4) including a second photodiode, a second floating diffusion region, and a second transfer transistor connected to the second photodiode and the second floating diffusion region, each first pixel (LPX1, LPX2, LPX3, LPX4) further includes a connecting transistor connecting the first floating diffusion region and the second floating diffusion region of one of the plurality of second pixels (SPX1, SPX2, SPX3, SPX4), the first pixels (LPX1, LPX2, LPX3, LPX4) and the second pixels (SPX1, SPX2, SPX3, and SPX4) are each arranged in an m*n arrangement, wherein m and n are natural numbers of 2 or more, such that at least four first pixels (LPX1, LPX2, LPX3, LPX4) are in the first region and at least four second pixels (SPX1, SPX2, SPX3, SPX4) are in the second region, in plane view, a total first photodiode area in the first region is greater than a total second photodiode area in the second region.