Method and system for converting interleaved video fields to progressive video frames in spatial domain

A system for converting a plurality of interleaved frames to a plurality of progressive frames, wherein each interleaved frame includes two interleaved fields and each interleaved field includes a plurality of pixels, comprising:

• a fetch controller to fetch a previous interleaved field, a current interleaved field, a next interleaved field, and a second next interleaved field;
• a calculating circuit to determine a first difference value by calculating the difference between a block of pixels of the current interleaved field and a corresponding block of pixels of the previous interleaved field, a second difference value by calculating the difference between the block of pixels of the current interleaved field and a corresponding block of pixels of the next interleaved field, and a third difference value by calculating the difference between the block of pixels of the current interleaved field and a corresponding block of pixels of the second next interleaved field;
• a progressive frame generating circuit to generate a first progressive frame by performing a weave method, a second progressive frame by performing a motion compensation method, and a third progressive frame by performing a bob method;
• and
• a selecting circuit to select one of the first, the second, and the third progressive frames to be a current progressive frame based on the first, the second, and the third difference values.

A method for converting a plurality of interleaved frames to a plurality of progressive frames, wherein each interleaved frame includes two interleaved fields and each interleaved field includes a plurality of pixels, comprising:

• fetching a previous interleaved field, a current interleaved field, a next interleaved field, and a second next interleaved field;
• determining a first difference value by calculating the difference between a block of pixels of the current interleaved field and a corresponding block of pixels of the previous interleaved field, a second difference value by calculating the difference between the block of pixels of the current interleaved field and a corresponding block of pixels of the next interleaved field, and a third difference value by calculating the difference between the block of pixels of the current interleaved field and a corresponding block of pixels of the second next interleaved field;
• generating a current progressive frame by performing a weave method if the third difference value is smaller than a first threshold value and the third difference value is smaller than at least one of the second difference value and the first difference value;
• and
• in the case when the third difference value is larger than the first threshold value or the third difference value is larger than both of the second difference value and the first difference value, generating the current progressive frame by performing a motion compensation method if at least one of the second difference value and the first difference value is not larger than a second threshold value, and generating the current progressive frame by performing a bob method if both the second difference value and the first difference value are larger than the second threshold value.

A system for converting a plurality of interleaved frames to a plurality of progressive frames, wherein each interleaved frame includes two interleaved fields and each interleaved field includes a plurality of pixels, comprising:

• a fetch controller to fetch a previous interleaved field, a current interleaved field, a next interleaved field, and a second next interleaved field;
• a calculating circuit to determine a first difference value by calculating the difference between a block of pixels of the current interleaved field and a corresponding block of pixels of the previous interleaved field, a second difference value by calculating the difference between the block of pixels of the current interleaved field and a corresponding block of pixels of the next interleaved field, and a third difference value by calculating the difference between the block of pixels of the current interleaved field and a corresponding block of pixels of the second next interleaved field;
• and
• a progressive frame generating circuit to generate a current progressive frame;
• wherein the progressive frame generating circuit generates the current progressive frame by performing a weave method if the third difference value is smaller than a first threshold value and the third difference value is smaller than at least one of the second difference value and the first difference value;
• wherein in the case when the third difference value is larger than the first threshold value or the third difference value is larger than both of the second difference value and the first difference value, the progressive frame generating circuit generate the current progressive frame by performing a motion compensation method if at least one of the second difference value and the first difference value is not larger than a second threshold value, and the progressive frame generating circuit generates the current progressive frame by performing a bob method if both the second difference value and the first difference value are larger than the second threshold value.