Encoding image data with quantizing and inverse-quantizing pixel values

摘要

An image processing system and a method thereof is disclosed. A palette including an N number of index pixel values of a processing target image and corresponding index values is created. N is an integer equal to or smaller than 2. An image indexing process is performed on each processing target pixel. When a pixel value of the processing target pixel is a pixel value of one of the N number of index pixel values, a pixel data on a converted image corresponding to the processing target pixel is set as an index value on the palette corresponding to the pixel value of the processing target pixel. Otherwise, the pixel data on the converted image corresponding to the processing target pixel is set as an exceptional value, and the pixel value of the processing target pixel is stored in an exception buffer.

主权项

1. A system comprising:
at least one memory configured to store computer-executable instructions; and at least one processor configured to execute the computer-executable instructions for processing image data comprising pixel values corresponding to a plurality of pixels, wherein a first pixel value corresponds to a first pixel and a second pixel value corresponds to a second pixel, each pixel value being within a predetermined range, wherein processing of the image data comprises:
assigning predicted values to the plurality of pixels such that a first predicted value is assigned to the first pixel and a second predicted value is assigned to the second pixel;generating difference data using the pixel values and the predicted values such that the difference data comprises a first difference between the first predicted value and the first pixel value and a second difference between the second predicted value and the second pixel value;performing quantization for the difference data to provide quantized data comprising a first quantized value converted from the first difference and a second quantized value converted from the second difference;performing inverse-quantization for the quantized data to provide a first inverse-quantized value for the first pixel and a second inverse-quantized value for the second pixel; andadjusting the quantized data to provide adjusted quantized data, wherein adjusting the quantized data comprises:
adding the first predicted value to the first inverse-quantized value to generate a first restoration value for the first pixel,determining that the first restoration value is within the predetermined range,adding the second predicted value to the second inverse-quantized value to generate a second restoration value for the second pixel,determining that the second restoration value is outside the predetermined range, andadding or subtracting a predetermined value to the second quantized value to provide an adjusted second quantized value such that the adjusted quantized data comprises the first quantized value for the first pixel and the adjusted second quantized value for the second pixel.