| 主权项 |
1. A contour correction device, comprising:
a video image judging unit which executes an edge detection process to detect a change of a signal in a video image as an edge portion and a texture detection process to detect a texture portion in which a change of a signal smaller than the edge portion repeatedly appears in the video image, wherein the edge detection process is executed for a process target range within the video image to determine if a process target pixel is in an edge portion by setting each pixel within the process target range as a pixel of interest, taking a difference between the pixel of interest and a pixel adjacent to the pixel of interest in a horizontal direction or a vertical direction and judging the process target pixel to be in the edge portion in response to the difference being greater than or equal to a predetermined edge detection threshold value, and wherein the texture detection process detects the texture portion by determining a number of boundaries detected within a texture detection range from the pixel of interest is greater than or equal to a predetermined number, where a boundary is determined as a difference between the signal of the pixel of interest and a signal of an adjacent pixel that is adjacent to the pixel of interest being greater than or equal to a texture detection threshold value and smaller than the edge detection threshold value, and a contour correction unit which applies contour correction processes which differ from each other to the edge portion and to the texture portion, wherein the contour correction unit sets a smaller range of a coring process when the process target pixel is in the texture portion than when the process target pixel is in the edge portion, sets a smaller range of a limiter process when the process target pixel is in the texture portion than when the process target pixel is in the edge portion, and sets a higher gain for a signal of the video image for the texture portion than for the edge portion. |
