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A method of operating an image processing system includes storing differences between first analog pixel signals and second analog pixel signals and converting the stored differences to one-bit digital signals, the first analog pixel signals being output from a plurality of pixels and corresponding

A method of operating an image processing system includes storing differences between first analog pixel signals and second analog pixel signals and converting the stored differences to one-bit digital signals, the first analog pixel signals being output from a plurality of pixels and corresponding to a previous frame, and the second analog pixel signals being output from the plurality of pixels and corresponding to a current frame.

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1. A multi-chip package (MCP) comprising: an image sensor including, a pixel array including a plurality of pixels configured to generate a plurality of pixel signal during each of a plurality of frames, the plurality of pixels including a first pixel, anda readout circuit configured to generate ima

1. A multi-chip package (MCP) comprising: an image sensor including, a pixel array including a plurality of pixels configured to generate a plurality of pixel signal during each of a plurality of frames, the plurality of pixels including a first pixel, anda readout circuit configured to generate image data based on the plurality of pixel signals, and including a plurality of pixel signal difference storage circuits and a plurality of analog to digital conversion circuits; andan image signal processor (ISP) configured to receive the image data, to process the image data and to generate the processed image data, wherein a first pixel signal difference storage circuit among the plurality of pixel signal difference storage circuits is configured to store a difference between a first pixel signal corresponding to a previous frame of the first pixel and a second pixel signal corresponding to a current frame of the first pixel, andthe plurality of analog to digital conversion circuits include a first analog to digital conversion circuit configured to convert the difference between the first pixel signal and the second pixel signal to a digital signal. 2. The MCP of claim 1, wherein the image data corresponds to motion information, to depth information, or to color information. 3. The MCP of claim 2, wherein the image sensor outputs to the ISP the image data corresponding to the motion information, the image data corresponding to the depth information, or, the image data corresponding to the color information, based on a mode selection signal. 4. The MCP of claim 1, wherein the first analog-to-digital conversion circuit includes a comparator configured to compare a reference voltage and the difference between the first pixel signal and the second pixel signal. 5. The MCP of claim 4, wherein the plurality of analog to digital conversion circuits include a plurality of initialization switches connected between one of input nodes of the comparator and an output node of the comparator, and when the plurality of initialization switches turn on, a voltage of the one of the input nodes of the comparator is initialized to be equal to the reference voltage. 6. The MCP of claim 1, wherein each of the plurality of pixel signal difference storage circuits is embodied with a coupling capacitor. 7. The MCP of claim 1, wherein the image sensor includes a power management unit configured to control a power supplied to a counter and a ramp signal generator that are included in the readout circuit, based on a mode selection signal. 8. The MCP of claim 1, further comprising: a plurality of pixel signal output switches connected between the plurality of pixels and the a plurality of coupling capacitors, wherein the plurality of pixel signal output switches are configured to control an output of each of the plurality of pixel signals, andthe plurality of pixel signal difference storage circuits are embodied with the plurality of coupling capacitors. 9. An electronic device comprising: an image sensor including, a pixel array including a plurality of pixels configured to generate a plurality of pixel signal during each of a plurality of frames, the plurality of pixels including a first pixel, anda readout circuit configured to generate image data based on the plurality of pixel signals, and including a plurality of pixel signal difference storage circuits and a plurality of analog to digital conversion circuits;an image signal processor (ISP) configured to receive the image data, to process the image data and to generate the processed image data;a CPU configured to generate a mode selection signal and output the mode selection signal to the image sensor;a memory configured to store an image generated by the ISP; anda display unit configured to receive the image from the ISP or the memory, and to display the image, wherein a first pixel signal difference storage circuit among the plurality of pixel signal difference storage circuits is configured to store a difference between a first pixel signal corresponding to a previous frame of the first pixel and a second pixel signal corresponding to a current frame of the first pixel,the plurality of analog to digital conversion circuits include a first analog to digital conversion circuit configured to convert the difference between the first pixel signal and the second pixel signal to a digital signal, andthe image sensor is configured to output to the ISP the image data corresponding to motion information or the image data corresponding to depth information based on the mode selection signal. 10. The electronic device of claim 9, wherein the image sensor outputs the image data corresponding to the motion information when the mode selection signal is at a first level, and the image sensor outputs the image data corresponding to the depth information when the mode selection signal is at a second level. 11. The electronic device of claim 10, wherein the first level is a low level, and the second level is a high level. 12. The electronic device of claim 9, wherein the image sensor and the ISP are embodied in a multi-chip package (MCP). 13. The electronic device C of claim 9, wherein the image sensor and the ISP are embodied in a package on package (PoP). 14. The electronic device of claim 9, wherein the first analog-to-digital conversion circuit includes a comparator configured to compare a reference voltage and the difference between the first pixel signal and the second pixel signal. 15. An image sensor comprising: a pixel array including a plurality of pixels configured to generate a plurality of pixel signal during each of a plurality of frames, the plurality of pixels including a first pixel; anda readout circuit configured to generate image data corresponding to motion information, to depth information or to color information, based on the plurality of pixel signals, the readout circuit including a plurality of pixel signal difference storage circuits, a plurality of analog to digital conversion circuits, a counter and a ramp signal generator, wherein a first pixel signal difference storage circuit among the plurality of pixel signal difference storage circuits is configured to store a difference between a first pixel signal corresponding to a previous frame of the first pixel and a second pixel signal corresponding to a current frame of the first pixel,the plurality of analog to digital conversion circuits include a first analog to digital conversion circuit configured to convert the difference between the first pixel signal and the second pixel signal to a digital signal, andthe image sensor is configured to output the image data corresponding to the motion information, the image data corresponding to the depth information or the image data corresponding to the color information, based on a mode selection signal. 16. The image sensor of claim 15, wherein the first analog-to-digital conversion circuit includes a comparator configured to compare a reference voltage and the difference between the first pixel signal and the second pixel signal. 17. The image sensor of claim 16, wherein the readout circuit includes a latch and sense amplifier block configured to latch a comparison signal received from the comparator. 18. The image sensor of claim 15, further comprising: a timing controller configured to control the readout circuit. 19. The image sensor of claim 15, further comprising: a power management unit configured to control a power supplied to the counter and the ramp signal generator, based on the mode selection signal. 20. The image sensor of claim 15, wherein the plurality of pixels are depth sensor pixels, andthe image sensor transmits the image data corresponding to the depth information based on the mode selection signal.