Apparatus and method of acquiring image by employing color separation lens array

A method of acquiring image data, the method comprising:

• inputting sensing signals for each color by an image sensor including a sensor substrate and a color separation lens array into a signal processor, wherein the sensor substrate includes a plurality of photo-sensing cells, and the color separation lens array separates an incident light into a plurality of lights having different wavelengths and form a phase distribution for condensing the plurality of lights having the different wavelengths on adjacent photo-sensing cells of the plurality of photo-sensing cells;
• estimating a blur kernel in a spatial domain based on a difference between a first image in which only a spectral resolution is deteriorated by a crosstalk point spread function (PSF) of the color separation lens array and a second image in which both the spectral resolution and a spatial resolution are deteriorated by the PSF;
• performing deconvolution on the sensing signals input the signal processor based on the estimated blur kernel to obtain a sub-sampled image in which a blur phenomenon is removed;
• performing demosaicing to restore a full resolution image having a full resolution from the sub-sampled image;
• and
• correcting a color of the full resolution image using the crosstalk PSF of the color separation lens array to form a color image.