52 results about "Packed pixel" patented technology

The invention provides a Mura phenomenon compensation method. An LCD display panel is divided into multiple display subareas comprising M rows and N columns of pixel points, pixel points at the first row and the first column and pixel points at the (M / 2+1)th row and the (N / 2+1)th column are selected respectively in each display subarea to serve as first pre-selected pixel points and second pre-selected pixel points; according to gray compensation values of four nearest first pre-selected pixel points around the position where a solved pixel point is and gray compensation values of the second pre-selected pixel points in the display subarea where the solved pixel point is, the gray compensation value of the solved pixel point in the display subarea is calculated. Through the gray compensation values of the second pre-selected pixel points, whether tiny Mura exists in the display subareas can be accurately judged, better compensation effects can be provided for tiny Mura falling in the display subareas, that is, compressed pixel areas, Mura compensation effects are ensured while consumption of hardware storage space is reduced, the product quality is enhanced, and the operation is simple and quick.

An image compression method for compressing groups of pixel data, including the following steps: MSB portions and LSB portions of the pixel data are compressed separately. Further, the LSB portions are grouped according to their associated MSB portions so that similar pixels are compressed together to gain higher a compression ratio. Some LSB portions are truncated to ensure a compression ratio. When performing compression, enhanced variable-length coding is adopted that predicts more accurate dividers by considering weighted combination of adjacent pixels. The quotient of each groups of compression portion is predicted and coded accordingly.

A pixel block (300) is compressed by sub-sampling at least a portion of the pixels (310) into subblocks (320, 330). Predictions are determined for the property values of these subblocks (320, 330) by calculating a variance measure based on property values of neighboring pixels (310) / subblocks (320, 330) in two prediction directions in the block (300) relative to a current subblock (320, 330). Ifthe variance is below a threshold, the prediction is calculated based on neighboring property values in both directions. If the measure exceeds the threshold, the neighboring property values in only one of the two predictions directions are used for calculating the prediction. A guiding bit (450) descriptive of the selected direction is also provided. A prediction error is calculated based on theproperty value and the calculated prediction. The compressed block (400) comprises an encoded representation (460) of the prediction error and any guiding bit (470).

An acquiring unit divides one line of image data in a main scan direction into blocks for every n consecutive pixels to acquire compressed pixel data generated by compressing each of the divided blocks. A first switching unit alternately switches a first or second data retaining unit defined as a write destination of the decompressed pixel data. A second switching unit alternately switches the first or second data retaining unit defined as a readout source of pixel data such that the pixel data are read out from the first or second data retaining unit not defined as the write destination of the pixel data by the first switching unit. A controller controls output of the pixel data from the first or second data retaining unit.