Electronic apparatus and adjustment method thereof

An adjustment method for use in an electronic apparatus, the electronic apparatus comprising a processor and an input interface, and the adjustment method comprising the following steps of:

• receiving a reference frame by the input interface, the reference frame corresponding to a plurality of luminance values;
• adjusting at least a portion of the luminance values that are greater than a predetermined threshold according to an accumulation number and a predetermined discard number by the processor;
• calculating a weighted luminance value of the reference frame according to the luminance values by the processor after the adjusting step;
• generating a comparison result by comparing the weighted luminance value and a luminance target by the processor;
• and
• deciding the luminance values according to the comparison result by the processor.