Video artifact identification and counting
Artifact detection and counting is enhanced using looping in both the horizontal and vertical direction is enhanced via a reduced bandwidth for accumulation of count values into count table entries. According to an example embodiment of the present invention, first and second loops are made for horizontal and vertical count table entries. Quotient and remainder values of a detected artifact value are used for increasing count table entries in the first looping pass, and the count table entries are increased using the quotient value in the second loop. The table increase in the first loop is limited to the length of the remainder value, and the table increase in the second loop is limited to the length of the row or column in the count table being used. In this manner, latency for additions to the count table and the bandwidth for making the additions are reduced, relative to conventional applications. In addition, each entry into the table can be reduced to one addition.
1. A method for artifact detection and counting in a video signal processing circuit having a count table, the method comprising using first and second loops for each of horizontal and vertical count table entries, the first loop being adapted to increase the count table entries up to the length of a remainder value of a detected artifact value and the second loop being adapted to increase the count table entries using a quotient value of a detected artifact value.
2. The method of claim 1 , wherein using first and second loops in a horizontal direction comprises:
defining a length of artifacts in the horizontal direction in a video image using the equation contour_H=(contourH_Q×PREVIOUS_GRID_SELECT+contour_H_R), wherein contour_H is the length value of the artifacts, contourH_Q being a quotient value and contour_H_R being a remainder value;
performing the first looping pass of a video data pixel block and increasing an entry in the count table in response to quotient and remainder values of contour_H, the count table entry being increased to a value not exceeding the remainder value; and
performing the second looping pass of the video data pixel block and increasing the remainder values of artifact entries with a value equal to the quotient value−1 and not exceeding the end of a horizontal row.
3. The method of claim 2 , wherein using first and second lops for horizontal count table entries includes using an incremental value inc defined by the equation inc=contour_H/PREVIOUS_GRID_SELECT.
4. The method of claim 1 , wherein using first and second loops in a vertical direction comprises:
defining a length of artifacts in the vertical direction in a video image using the equation contour_V=contour_V_Q*8+contour_V_R, wherein contour_V is the length value of the artifacts, contour_V_Q being a quotient value and contour_V_R being a remainder value;
performing the first looping pass of a video data pixel block and increasing an entry in the count table in response to quotient and remainder values of contour_H, the count table entry being increased to a value not exceeding the remainder value; and
performing the second looping pass of the video data pixel block and increasing the remainder values of artifact entries with a value equal to the quotient value−1 and not exceeding the end of a vertical column.
5. The method of claim 4 , wherein using first and second lops for vertical count table entries includes using an incremental value inc defined by the equation inc=contour_V/8.
6. The method of claim 1 , wherein the vertical size of the count table entries is eight.
7. The method of claim 1 , wherein the horizontal size of the count table entries is eight.
8. The method of claim 1 , wherein the horizontal size of the count table entries is ten.
9. The method of claim 1 , wherein the horizontal size of the count table entries is twelve.
10. The method of claim 1 , further comprising defining a boundary for the size of at least a portion of a loop.
11. The method of claim 10 , wherein defining a boundary includes defining an upper boundary.
12. The method of claim 10 , wherein defining a boundary includes defining a lower boundary.
13. The method of claim 10 , wherein defining a boundary includes effecting a wrap around within the count table.
14. The method of claim 1 , wherein the count table entries is increased using only one addition.