Demosaicing device and demosaicing method for image sensor

A demosaicing device for an image sensor, comprising:

• a pixel array capturing a panchromatic image and a chromic image, comprising:
• a switchable pixel, comprising a first photodiode and an electrochromic layer above the first photodiode, wherein the switchable pixel further comprises a bottom electrode between the first photodiode and the electrochromic layer, an electrolyte layer on the electrochromic layer, an ion storage layer on the electrolyte layer, a top electrode on the ion storage layer, and a micro lens array on the top electrode;
• and
• a clear pixel adjacent to the switchable pixel and comprising a second photodiode,
• wherein the electrolyte layer, the ion storage layer, the top electrode, and the micro lens array extend above the second photodiode,
• wherein the switchable pixel and the clear pixel are under a clear state when the electrochromic layer is unbiased,
• wherein the switchable pixel is under a color state and the clear pixel is under the clear state when the electrochromic layer is biased;
• a calculating circuit performing a weighted average calculation and a signal subtraction on the chromic image and the panchromatic image to generate a plurality of first resolution chromic images;
• and
• a correction circuit fusing the plurality of the first resolution chromic images with the panchromatic image to generate a plurality of demosaiced chromic images.

A demosaicing method for an image sensor, comprising:

• capturing a panchromatic image by using a pixel array comprising a plurality of switchable pixels and a plurality of clear pixels when the switchable pixels and the clear pixels are under a clear state, wherein a pixel set of the pixel array comprises two of the switchable pixels and two of the clear pixels arranged in an array of two rows by two columns;
• capturing a chromic image by using the pixel array when the switchable pixels are under a color state and the clear pixels are under the clear state;
• performing a weighted average calculation and a signal subtraction on the chromic image and the panchromatic image to generate a plurality of first resolution chromic images, wherein a resolution of the first resolution chromic images is same as a resolution of the panchromatic image and the chromic image, wherein the step of performing the signal subtraction on the chromic image and the panchromatic image comprises subtracting a signal of one of the clear pixels of the panchromatic image from a signal of the one of the clear pixels of the chromic image to generate a subtracted signal being zero;
• and
• fusing the plurality of the first resolution chromic images with the panchromatic image to generate a plurality of demosaiced chromic images.