Method for acquiring histogram, method for dynamically adjusting luminance and image processing apparatus

A method for dynamically adjusting luminance, wherein the method for dynamically adjusting luminance comprises the following steps:

• acquiring luminance data of pixel points of a dynamic video image;
• performing separate statistical processing on frequencies of first luminance data with the minimum luminance value and second luminance data with the maximum luminance value in the luminance data, to draw a first histogram corresponding to the luminance data after the statistical processing;
• acquiring a main distribution range of luminance according to the first histogram;
• and
• level-stretching luminance of the dynamic video image according to the first histogram and the main distribution range.

An image processing apparatus, wherein the apparatus comprises:

• a first acquisition module, used for acquiring luminance data of pixel points of a dynamic video image;
• a drawing module, used for performing separate statistical processing on frequencies of first luminance data with the minimum luminance value and second luminance data with the maximum luminance value in the luminance data, to draw a first histogram corresponding to the luminance data after the statistical processing;
• a second acquisition module, used for acquiring a main distribution range of luminance according to the first histogram;
• and
• a stretching module, used for level-stretching luminance of the dynamic video image according to the first histogram and the main distribution range.