Apparatus and method for adjusting brightness

In a display system, an inputted video sequence comprising N image frames to be displayed which each consists of T pixels, each pixel of each image frame comprising M color components and M gray scale levels which each corresponds to one of the M color components, N, T, and M being a natural number, respectively, a method functioning adjusting the M gray scale levels of the M color components of the ith image frame in the video sequence, i being an integer index ranging from 1 to N, the gray scale levels of the image frames previous to the ith image frame having been adjusted, each of the image frames previous to the ith image frame having a respective brightness ratio which relates to the gray scale levels been determined of said one image frame and is within an allowable range, a plurality of gains which each corresponds to one of the brightness ratios varying within the allowable range being previously provided, said method comprising the following steps of:

• (a)retrieving all of the gray scale levels of all pixels of the ith image frame;
• (b)calculating a current brightness ratio according to all of the gray scale levels of all pixels of the ith image frame;
• (c)calculating an averaged brightness ratio according to all of the brightness ratios of the image frames previous to the ith image frame and the current brightness ratio;
• (d)receiving the current brightness ratio and the averaged brightness ratio;
• (e)outputting one selected from the current brightness ratio or the averaged brightness ratio as an outputted brightness ratio, wherein the outputted brightness ratio is also within the allowable range;
• (f)storing the brightness ratios varying within the allowable range and the corresponding gains, receiving the outputted brightness ratio, and determining the gain corresponding to the outputted brightness ratio;
• and
• (g)receiving the gain corresponding to the outputted brightness ratio, and multiplying the gray scale level of each color component of the ith image by the gain corresponding to the outputted brightness ratio, respectively.

In a display system, an inputted video sequence comprising N image frames to be displayed which each consists of T pixels, each pixel of each image frame being converted to comprise M color components and a luminance component, N, T, and M being a natural number, respectively, an apparatus functioning adjusting the luminance of the luminance component of the ith image frame in the video sequence, i being an integer index ranging from 1 to N, the luminance of the image frames previous to the ith image frame having been adjusted, each of the image frames previous to the ith image frame having a respective luminance ratio which relates to the luminance been determined of said one image frame and is within an allowable range, a plurality of gains which each corresponds to one of the luminance ratios varying within the allowable range being previously provided, said apparatus comprising:

• a first calculating module for retrieving all of the luminance of all pixels of the ith image frame, and calculating, according to all of the luminance of all pixels of the ith image frame, a current luminance ratio;
• a second calculating module for calculating, according to all of the luminance ratios of the image frames previous to the ith image frame and the current luminance ratio, an averaged luminance ratio;
• a judging module for receiving the current luminance ratio and the averaged luminance ratio, and outputting one selected from the current luminance ratio or the averaged luminance ratio as an outputted luminance ratio, wherein the outputted luminance ratio is also within the allowable range;
• a determining module for storing the luminance ratios varying within the allowable range and the corresponding gains, the determining module having an input coupled to receive the outputted luminance ratio, the determining module also functioning determining the gain corresponding to the outputted luminance ratio;
• and
• an adjusting module for receiving the gain corresponding to the outputted luminance ratio, and multiplying the luminance of each luminance component of the ith image by the gain corresponding to the outputted luminance ratio, respectively.

In a display system, an inputted video sequence comprising N image frames to be displayed which each consists of T pixels, each pixel of each image frame being converted to comprise M color components and a luminance component, N, T, and M being a natural number, respectively, a method functioning adjusting the luminance of the luminance component of the ith image frame in the video sequence, i being an integer index ranging from 1 to N, the luminance of the image frames previous to the ith image frame having been adjusted, each of the image frames previous to the ith image frame having a respective luminance ratio which relates to the luminance been determined of said one image frame and is within an allowable range, a plurality of gains which each corresponds to one of the luminance ratios varying within the allowable range being previously provided, said apparatus comprising:

• (a)retrieving all of the luminance of all pixels of the ith image frame
• (b)calculating a current luminance ratio according to all of the luminance of all pixels of the ith image frame;
• (c)calculating an averaged luminance ratio according to all of the luminance ratios of the image frames previous to the ith image frame and the current luminance ratio;
• (d)receiving the current luminance ratio and the averaged luminance ratio
• (e)outputting one selected from the current luminance ratio or the averaged luminance ratio as an outputted luminance ratio, wherein the outputted luminance ratio is also within the allowable range;
• (f)storing the luminance ratios varying within the allowable range and the corresponding gains, receiving the outputted luminance ratio, and determining the gain corresponding to the outputted luminance ratio;
• and
• (g)receiving the gain corresponding to the outputted luminance ratio, and multiplying the luminance of each luminance component of the ith image by the gain corresponding to the outputted luminance ratio, respectively.