Preprocessing method and preprocessing system for improving image recognition

A preprocessing method for improving image recognition, comprising:

• disposing three light-emitting diodes at a left side, a right side, and a lower side of an image sensor, respectively, the image sensor corresponding to an image capture region;
• turning on the three light-emitting diodes, such that each of the light-emitting diodes emits at least one white light source having a color temperature of 3200K, wherein each of the white light sources has a fixed illumination area range, and the illumination area ranges of the three white light sources at least cover one half of the image capture region, such that a color temperature of the covered half of the image capture region is approximately or equal to 3200K;
• turning off the three light-emitting diodes for a time interval, such that the image sensor captures images to generate a preprocessing frame under a low illuminance condition that is between 0.0004 lux and 1 lux;
• and
• alternatingly turning on and off the three light-emitting diodes, such that the image sensor generates a plurality of the preprocessing frames;
• wherein the time interval is between 10 milliseconds and 200 milliseconds.

A preprocessing system for improving image recognition, comprising:

• an image sensor corresponding to an image capture region;
• and
• three light-emitting diodes disposed at a left side, a right side, and a lower side of the image sensor, respectively, each of the light-emitting diodes emitting at least one white light source having a color temperature of 3200K, and each of the white light sources having a fixed illumination area range;
• wherein the illumination area ranges of the three white light sources at least cover one half of the image capture region, such that a color temperature of the covered half of the image capture region is approximately or equal to 3200K;
• wherein the image sensor generates a preprocessing frame under a low illuminance condition between 0.0004 lux and 1 lux, and the low illuminance condition is generated by turning on and off the light-emitting diodes once;
• wherein the light-emitting diodes elapse a time interval since turning off, and the time interval is between 10 milliseconds and 200 milliseconds.