Image processing method
An image processing method is adapted for color enhancement of an original image pixel. The original image pixel is composed of a plurality of pixel components each having a component value. The image processing method includes: determining a hue region to which the original image pixel belongs based directly on the component values of the pixel components thereof; selecting a color enhancement parameter corresponding to the determined hue region; and obtaining a color enhanced pixel according to the selected color enhancement parameter and the component values of the pixel components of the original image pixel.
1. An image processing method for processing an original image pixel composed of a plurality of pixel components each having a component value, said image processing method to implemented by an image processing device and comprising:
a) configuring the image processing device to determine, from a plurality of predetermined hue regions, the hue region to which the original image pixel belongs based directly on the component values of the pixel components thereof;
b) configuring the image processing device to select a color enhancement parameter corresponding to the hue region determined in step a); and
c) configuring the image processing device to obtain a color enhanced pixel according to the color enhancement parameter selected in step b) and the component values of the pixel components of the original image pixel.
2. The image processing method as claimed in claim 1 , wherein, in step a), each of the hue regions has a plurality of sub-hue regions.
3. The image processing method as claimed in claim 2 , wherein the pixel components include a first component having the largest component value of the original image pixel, a second component, and a third component having the smallest component value of the original image pixel, and step a) includes:
a-1) configuring the image processing device to divide a range defined by the component values of the first and third components into a plurality of sub-ranges, each corresponding to a respective one of the sub-hue regions; and
a-2) configuring the image processing device to determine one of the sub-hue regions to which the original image pixel belongs according to one of the sub-ranges that has the component value of the second component falling therewithin.
4. The image processing method as claimed in claim 3 , wherein, in step b), the image processing device is configured to select the color enhancement parameter from a plurality of predetermined ones of the color enhancement parameters that correspond respectively to the sub-hue regions according to said one of the sub-hue regions determined in step a-2).
5. The image processing method as claimed in claim 3 , wherein, in step c), the image processing device is configured to obtain, according to the color enhancement parameter selected in step b) and the component values of the pixel components of the original image pixel, the color enhanced pixel composed of a first enhanced component that corresponds to the first component and that has the largest component value of the color enhanced pixel, a second enhanced component that corresponds to the second component, and a third enhanced component that corresponds to the third component and that has the smallest component value of the color enhanced pixel.
6. The image processing method as claimed in claim 3 , wherein the pixel components of the original image pixel are red-green-blue (RGB) color space components.
7. The image processing method as claimed in claim 1 , wherein, in step c), the color enhanced pixel is obtained without converting the pixel components of the original image pixel to a different color space.