Patent ID: 8373798

Claim:
A text protection device for de-interlacing operation, the text protection device comprising: a pixel value difference calculation unit, for calculating pixel value differences of a plurality of pixel pairs of a field according to a position where a target pixel to be inserted into the field, the plurality of pixel pairs forming a detection area corresponding to the target pixel, each of the plurality of pixel pairs having two pixels respectively corresponding to a first scan line and a second scan line, the first scan line and the second scan line respectively located above and below the position where the target pixel to be inserted; and a text detection unit, coupled to the pixel value difference calculation unit, for determining whether the target pixel is within a range of a text stroke according to a pixel value difference distribution of the detection area to generate a text detection signal; wherein the text detection unit comprises: a first detection unit, for determining that a text stroke intersection occurs in the detection area when the pixel value difference distribution of the detection area has a local minimum; and a second detection unit, for determining that a horizontal text stroke occurs in the detection area when the pixel value difference distribution of the detection area has two local minimums and forms an ascend-flat-descend tendency between the two local minimums.