Systems and methods for document background color suppression

A system comprising:

• a memory unit storing image data of an input image in a color space, wherein the input image pertains to a document having a background color;
• and
• a processor in communication with the memory unit, wherein the processor is configured to execute instructions that perform operations including:
• receiving the image data including lightness values of pixels in the input image;
• accumulating elevation angles computed for the pixels in the input image, wherein each of the elevation angles represents hue and chroma of a color of the pixel;
• selecting a tile region in the input image, the tile region having a first threshold value for the elevation angles and a second threshold value for the lightness values;
• and
• suppressing the background color in the input image by changing a pixel value of the pixel to a pre-selected color when the elevation angle of the pixel is greater than the first threshold value and the lightness value of the pixel is greater than the second threshold value.