Image Processing Device with a CSA Accumulator for Improving Image Quality and Related Method

Abstract

An image processing device includes a CSA accumulator, a first register, a CPA adder and a central processing unit. The CSA accumulator includes a first input for receiving a processing signal and a second input for receiving a previous result of the CSA accumulator. The first register includes an input coupled to the CSA accumulator and an output coupled to the second input end of the CSA accumulator. The CPA adder is coupled to the first register. The CPA adder is used for processing an addition operation on all carries outputted from the first register. The central processing unit includes an input coupled to the CPA adder and an output end for outputting an output signal comprising processed image measurement data.

1 . A method for improving image quality with a Carry-Save-Add (CSA) accumulator, the method comprising:
 processing carry-save addition on image measurement data of a pixel once within a predetermined clock period; and   processing carry-pass addition once on all carries generated by processing carry-save addition when a vertical synchronization signal is active.   
     
     
         2 . The method of  claim 1  further comprising processing a calculated image measurement data after processing the carry-pass addition, wherein processing the calculated image measurement data is performing an image auto white balance (AWB) process, an image auto focus (AF) process, or an image exposure process. 
     
     
         3 . The method of  claim 1  wherein the image measurement data comprises an image information selected from a group essentially consisting of a luminance information, a gradient information and a chrominance information of an image pixel.