Processing system with dynamic alteration of a color look-up table
First Claim
1. A method of converting an input data stream including a sequence of input data blocks into a converted stream suitable for addressing a look-up table, the method comprising the steps of:
- determining if an input block of the input data stream corresponds to a predetermined value;
combining the input block with a previously-stored identifier of a first portion of the look-up table if the input block does not correspond to the predetermined value; and
storing an identifier of a second portion of the look-up table if the input block does correspond to the predetermined value, wherein the step of storing further includes the steps of receiving a subsequent input block of the input data sequence and storing the subsequent input block as the identifier of the second portion.
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Accused Products
Abstract
A method and apparatus for dynamic alteration of a color look-up table (CLUT) pallet identifier in response to one or more key codes placed in an input data stream. An input data stream including a sequence of input data blocks is converted into a stream suitable for addressing a look-up table. The look-up table may be a 256×16 table which requires an 8-bit address to identify a particular table entry. The invention allows such a table to be addressed using 4-bit data blocks in the input data stream. For each received 4-bit data block in the input data stream, a determination is made as to whether that block corresponds to a predetermined key value. If a given input block does not correspond to the predetermined key value, the 4-bit input block is combined with a previously-stored 4-bit pallet identifier to generate an 8-bit address into the look-up table. The pallet identifier specifies one of 16 different 16-entry pallets within the 256×16 look-up table. If the given input block does correspond to the key value, a new 4-bit pallet identifier is stored. The new pallet identifier may be contained within a data block which immediately follows the key value block in the data stream. The new pallet identifier is then used in combination with subsequent 4-bit data blocks in the stream to generate 8-bit addresses into the look-up table.
196 Citations
19 Claims
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1. A method of converting an input data stream including a sequence of input data blocks into a converted stream suitable for addressing a look-up table, the method comprising the steps of:
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determining if an input block of the input data stream corresponds to a predetermined value; combining the input block with a previously-stored identifier of a first portion of the look-up table if the input block does not correspond to the predetermined value; and storing an identifier of a second portion of the look-up table if the input block does correspond to the predetermined value, wherein the step of storing further includes the steps of receiving a subsequent input block of the input data sequence and storing the subsequent input block as the identifier of the second portion.
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2. A method of converting an input data stream including a sequence of input data blocks into a converted stream suitable for addressing a look-up table, the method comprising the steps of:
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determining if an input block of the input data stream corresponds to a predetermined value; combining the input block with a previously-stored identifier of a first portion of the look-up table if the input block does not correspond to the predetermined value; accessing the look-up table using an address corresponding to the result of the step of combining the input block with a previously-stored identifier of a first portion of the look-up table; and storing an identifier of a second portion of the look-up table if the input block does correspond to the predetermined value.
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3. A method of converting an input data stream including a sequence of input data blocks into a converted stream suitable for addressing a look-up table, the method comprising the steps of:
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determining if an input block of the input data stream corresponds to a predetermined value; combining the input block with a previously-stored identifier of a first portion of the look-up table if the input block does not correspond to the predetermined value; combining a subsequent data block with the previously-stored identifier to thereby provide an address into the look-up table; and storing an identifier of a second portion of the look-up table if the input block does correspond to the predetermined value.
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4. A method of converting an input data stream including a sequence of input data blocks into a converted stream suitable for addressing a look-up table, the method comprising the steps of:
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determining if an input block of the input data stream corresponds to a predetermined value; combining the input block with previously-stored identifier of a first portion of the look-up table if the input block does not correspond to the predetermined value; combining a subsequent data block with the stored identifier of a second portion of the look-up table to thereby provide an address into the look-up table; and storing an identifier of a second portion of the look-up table if the input block does correspond to the predetermined value.
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5. A method of converting an input data stream including a sequence of input data blocks into a converted stream suitable for addressing a look-up table, the method comprising the steps of:
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determining if an input block of the input data stream corresponds to a predetermined value; combining the input block with a previously-stored identifier of a first portion of the look-up table if the input block does not correspond to the predetermined value; and storing an identifier of a second portion of the look-up table if the input block does correspond to the predetermined value, wherein the look-up table is a 22y xm table, the data block is a y-bit data block and the identifiers of the first portion and the second portion are y-bit identifiers.
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6. A method of converting an input data stream including a sequence of input data blocks into a converted stream suitable for addressing a look-up table, the method comprising the steps of:
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determining if an input block of the input data stream corresponds to a predetermined value; combining the input block with a previously-stored identifier of a first portion of the look-up table if the input block does not correspond to the predetermined value; and storing an identifier of a second portion of the look-up table if the input block does correspond to the predetermined value, wherein the look-up table is a 256×
16 table, the data block is a 4-bit data block and the identifiers of the first portion and the second portion are 4-bit identifiers.
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7. An apparatus for converting an input data stream including a sequence of input data blocks into a converted stream suitable for addressing a look-up table, the apparatus comprising:
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a comparator having an input connected to receive an input block of the input data stream, and an output providing a signal indicative of whether the input block corresponds to a predetermined value; and a circuit connected to the comparator and receiving the signal therefrom, the circuit operative to combine the input block with a previously-stored identifier of a first portion of the look-up table if the input block does not correspond to the predetermined value, and to store an identifier of a second portion of the look-up table if the input block does correspond to the predetermined value. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. An apparatus for converting an input data stream including a sequence of input data blocks into a converted stream, the apparatus comprising:
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a look-up table having a plurality of input address lines, wherein a first set of the input address lines are connected to receive an input block of the input data stream; a comparator having an input connected to receive an input block of the input data stream, and an output providing a signal indicative of whether the input block corresponds to a predetermined value; and a first register having a load signal input coupled to the output of the comparator, a data input connected to receive an input block of the data stream, and an output coupled to a second set of the input address lines of the look-up table, the register storing an identifier of a first portion of the look-up table, the register loading the input block as an identifier of a second portion of the look-up table if the input block corresponds to the predetermined value, and supplying the previously stored identifier of a first portion of the look-up table to the output of said register if the input block does not correspond to the predetermined value. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification