Method and apparatus for compressing parameter values for pixels in a display frame

A method for double edge compression of parameter values for pixels of a pixel block, comprising:

• performing a first edge compression, wherein the first edge compression includes:
• translating parameter values for the pixel block into a first column-wise differential slope representation, wherein the first column-wise differential slope representation includes a first plurality of pixel point values along a first edge of the pixel block, a first plurality of column slopes, and a first plurality of column slope differentials, wherein each column slope differential of the first plurality of column slope differentials represents a column slope deviation at a pixel point not represented by the first plurality of pixel point values and the first plurality of column slopes;
• and
• translating the first column-wise differential slope representation into a first planar differential slope representation, wherein the first planar slope representation reduces the first plurality of pixel point values and the first plurality of column slopes to a first reference pixel value, a first reference column slope, a first reference row slope, and a first plurality of row slope differentials;
• performing a second edge compression, wherein the second edge compression includes:
• translating at least a portion of the parameter values for the pixel block into a second column-wise differential slope representation, wherein the second column-wise differential slope representation includes a second plurality of pixel point values along a second edge of the pixel block, a second plurality of column slopes, and a second plurality of column slope differentials, wherein each column slope differential of the second plurality of column slope differentials represents a column slope deviation at a pixel point not represented by the second plurality of pixel point values and the second plurality of column slopes;
• and
• translating the second column-wise differential slope representation into a second planar differential slope representation, wherein the second planar slope representation reduces the second plurality of pixel point values and the second plurality of column slopes to a second reference pixel value, a second reference column slope, a second reference row slope, and a second plurality of row slope differentials;
• and
• generating an output format representation for the pixel block, wherein generating the output format representation includes:
• when a predetermined breakpoint pattern in one of the first and second pluralities of column slope differentials is detected, generating a double edge output format representation of the parameter values for the first and second column-wise differential column slope representations, wherein the double edge output format representation orders the first and second reference pixel values, the first and second reference row slopes, the first and second reference column slopes, portions of each of the first and second pluralities of row slope differentials, portions of the first and second pluralities of column slope differentials, and a breakpoint indication in a predetermined double edge order, wherein the portions of the first and second pluralities of column and row slope differentials included in the double edge output format representation are determined based on location of the predetermined breakpoint pattern in the pixel block, wherein the breakpoint indication describes the portions of the first and second pluralities of column and row slope differentials;
• and
• when the predetermined breakpoint pattern is not detected, generating a single edge output format representation of the parameter values for the pixel block, wherein the single edge output format representation orders the first reference pixel value, the first reference column slope, the first reference row slope, the first plurality of row slope differentials, and the first plurality of column slope differentials in a predetermined single edge order.

A method for compressing parameter values for pixels in a display frame, wherein each pixel within the display frame has a corresponding parameter value, comprising:

• grouping pixels of the display frame into a plurality of pixel blocks;
• for at least one pixel block of the plurality of pixel blocks:
• translating parameter values for the pixel block into a column-wise differential slope representation, wherein the column-wise differential slope representation includes a plurality of pixel point values, a plurality of column slopes, and a plurality of column slope differentials, wherein each column slope differential represents a column slope deviation at a pixel point not represented by the plurality of pixel point values and the plurality of column slopes;
• translating the column-wise differential slope representation into a planar differential slope representation, wherein the planar slope representation reduces the plurality of pixel point values and the plurality of column slopes to a reference pixel value, a reference column slope, a reference row slope, and a plurality of row slope differentials;
• and
• generating an output format representation of the parameter values for the pixel block from the planar differential slope representation, wherein the output format representation orders the reference pixel value, the reference column slope, the reference row slope, the plurality of row slope differentials, and the plurality of column slope differentials in a predetermined pattern selecting one of the four corner pixels as a first reference pixel for the first pixel block.

A pixel parameter compression processor for compressing parameter values for pixels of a pixel block, comprising:

• a processing module;
• and
• memory operably coupled to the processing module, wherein the memory stores operating instructions that, when executed by the processing module, cause the processing module to perform the functions of:
• translating parameter values for the pixel block into a column-wise differential slope representation;
• translating the column-wise differential slope representation into a planar differential slope representation;
• and
• generating an output format representation of the parameter values for the pixel block from the planar differential slope representation.

A pixel parameter compression processor for compressing parameter values for pixels of a pixel block, comprising:

• a processing module;
• and
• memory operably coupled to the processing module, wherein the memory stores operating instructions that, when executed by the processing module, cause the processing module to perform the functions of:
• performing a first edge compression, wherein the first edge compression includes:
• translating parameter values for the pixel block into a first column-wise differential slope representation, wherein the first column-wise differential slope representation includes a first plurality of pixel point values along a first edge of the pixel block, a first plurality of column slopes, and a first plurality of column slope differentials, wherein each column slope differential of the first plurality of column slope differentials represents a column slope deviation at a pixel point not represented by the first plurality of pixel point values and the first plurality of column slopes;
• and
• translating the first column-wise differential slope representation into a first planar differential slope representation, wherein the first planar slope representation reduces the first plurality of pixel point values and the first plurality of column slopes to a first reference pixel value, a first reference column slope, a first reference row slope, and a first plurality of row slope differentials;
• performing a second edge compression, wherein the second edge compression includes:
• translating at least a portion of the parameter values for the pixel block into a second column-wise differential slope representation, wherein the second column-wise differential slope representation includes a second plurality of pixel point values along a second edge of the pixel block, a second plurality of column slopes, and a second plurality of column slope differentials, wherein each column slope differential of the second plurality of column slope differentials represents a column slope deviation at a pixel point not represented by the second plurality of pixel point values and the second plurality of column slopes;
• and
• translating the second column-wise differential slope representation into a second planar differential slope representation, wherein the second planar slope representation reduces the second plurality of pixel point values and the second plurality of column slopes to a second reference pixel value, a second reference column slope, a second reference row slope, and a second plurality of row slope differentials;
• and
• generating an output format representation for the pixel block, wherein generating the output format representation includes:
• when a predetermined breakpoint pattern in one of the first and second pluralities of column slope differentials is detected, generating a double edge output format representation of the parameter values for the first and second column-wise differential column slope representations, wherein the double edge output format representation orders the first and second reference pixel values, the first and second reference row slopes, the first and second reference column slopes, portions of each of the first and second pluralities of row slope differentials, portions of the first and second pluralities of column slope differentials in a predetermined pattern, and a breakpoint indication, wherein the included portions, which include the portions of the first and second pluralities of column and row slope differentials included in the double edge output format representation, are determined based on location of the predetermined breakpoint pattern in the pixel block, wherein the breakpoint indication describes included portions;
• and
• when the predetermined breakpoint pattern is not detected, generating a single edge output format representation of the parameter values for the pixel block, wherein the single edge output format representation orders the first reference pixel value, the first reference column slope, the first reference row slope, the first plurality of row slope differentials, and the first plurality of column slope differentials in a predetermined order.

A pixel parameter compression processor for compressing parameter values for pixels in a display frame, wherein each pixel within the display frame has a corresponding parameter value, comprising:

• a processing module;
• and
• memory operably coupled to the processing module, wherein the memory stores operating instructions that, when executed by the processing module, cause the processing module to perform the functions of:
• grouping pixels of the display frame into a plurality of pixel blocks;
• for at least one pixel block of the plurality of pixel blocks:
• translating parameter values for the pixel block into a column-wise differential slope representation, wherein the column-wise differential slope representation includes a plurality of pixel point values, a plurality of column slopes, and a plurality of column slope differentials, wherein each column slope differential represents a column slope deviation at a pixel point not represented by the plurality of pixel point values and the plurality of column slopes;
• translating the column-wise differential slope representation into a planar differential slope representation, wherein the planar slope representation reduces the plurality of pixel point values and the plurality of column slopes to a reference pixel value, a reference column slope, a reference row slope, and a plurality of row slope differentials;
• and
• generating an output format representation of the parameter values for the pixel block from the planar differential slope representation, wherein the output format representation orders the reference pixel value, the reference column slope, the reference row slope, the plurality of row slope differentials, and the plurality of column slope differentials in a predetermined pattern selecting one of the four corner pixels as a first reference pixel for the first pixel block.