In a CMOS-type image sensor, a plurality of pairs of light-detecting
elements (LDEs) are arranged in rows and columns to generate analog
signals proportional to the intensity of light impinging on respective one
of the LDEs. First and second photo sensing means in each pair of LDEs are
coupled in parallel, in the column direction, at a floating sensing point
through first turn-on means. The first and second photo sensing means in
adjacent pairs of LDEs are coupled in parallel in the column direction
through second turn-on means. The first turn-on means are enabled by first
control lines and the second turn-on means are enabled by second control
lines coupled thereto, respectively. Analog signals acquired in the first
and second photo sensing means of one pair or of adjacent pairs are
present at the floating sensing point in response to the enabling of the
first or second control lines, respectively.
