Edge adaptive de-interlacing apparatus and method thereof
View Patent ↗An edge adaptive de-interlacing apparatus and method are disclosed. The edge adaptive de-interlacing apparatus includes a complexity detection module, a qualifier, a comparator and a mixer. The complexity detection module detects complexity associated with a target pixel. The qualifier is coupled to the complexity detection module for generating similarity of at least one possible edge angle in response to the complexity. The comparator is coupled to the qualifier for comparing the similarity of the at least one possible edge to select a preferred edge angle. The mixer is coupled to the comparator for generating pixel data of the target pixel according to the preferred edge angle.
1. An edge adaptive de-interlacing apparatus for de-interlacing a target pixel, comprising:
an extreme-value detection module, for detecting at least an extreme-value position of a luminance distribution curve in a first region associated with the target pixel to output a prediction signal for indicating a predicted angle region, wherein the extreme-value detection module comprises:
a first extreme-value detector, for detecting a first extreme-value position of a luminance distribution curve of a first display line in the first region and accordingly outputting a first extreme-value signal;
a second extreme-value detector, for detecting a second extreme-value position of a luminance distribution curve of a second display line in the first region and accordingly outputting a second extreme-value signal; and
an angle predictor, for outputting the prediction signal according to the first extreme-value signal and the second extreme-value signal;
a qualifier, coupled to the extreme-value detection module for generating similarity of at least one possible edge angle in response to the predicted angle region;
a comparator, coupled to the qualifier for comparing the similarity of the at least one possible edge angle to select a preferred edge angle; and
a mixer, coupled to the comparator for generating pixel data of the target pixel according to the preferred edge angle.
2. The edge adaptive de-interlacing apparatus according to claim 1 , wherein the mixer generates pixel data of the target pixel by interpolating the first display line and the second display line adjacent to the target pixel.
3. The edge adaptive de-interlacing apparatus according to claim 1 , wherein the extreme-value detection module outputs the prediction signal to indicate the predicted angle region when each of luminance distribution curves of the first display line and the second display line in the first region associated with the target pixel has an extreme value.
4. The edge adaptive de-interlacing apparatus according to claim 1 , further comprising a memory module coupled to the extreme-value detection module.
5. The edge adaptive de-interlacing apparatus according to claim 4 , wherein the memory module is a line buffer.
6. The edge adaptive de-interlacing apparatus according to claim 4 , wherein the memory module comprises:
a first memory, for storing the first display line; and
a second memory, for storing the second display line.
7. An edge adaptive de-interlacing method for de-interlacing a target pixel, comprising:
detecting at least one extreme-value position surrounding the target pixel and accordingly outputting a prediction signal for indicating a predicted angle region, wherein the detecting step comprises:
detecting a first extreme value of a luminance distribution curve of the first display line in the predetermined region and accordingly outputting a first extreme-value signal;
detecting a second extreme value of a luminance distribution curve of the second display line in the predetermined region and accordingly outputting a second extreme-value signal; and
outputting the prediction signal to indicate the predicted angle region according to the first extreme-value signal and the second extreme-value signal;
generating similarity of at least one possible edge angle in response to the predicted angle region;
selecting a preferred edge angle according to the similarity of the at least one possible edge angle; and
generating pixel data of the target pixel according to the preferred edge angle.
8. The de-interlacing method according to claim 7 , wherein in the step of generating pixel data, the pixel data of the target pixel are generated by interpolating the first display line and the second display line adjacent to the target pixel.
9. The de-interlacing method according to claim 7 , wherein at least one extreme-value position is determined by a change of a positive sign and a negative sign in a differential operation.
10. The de-interlacing method according to claim 7 , wherein in the detecting step, the prediction signal is outputted to indicate the predicted angle region when each of luminance distribution curves of the first display line and the second display line in a predetermined region associated with the target pixel has an extreme value.