Systems and methods for spatially isolated artifact dissection, classification and measurement
View Patent ↗Embodiments of the present invention relate to a method of measuring a test video frame. A test video input is provided, along with an artifact measurement control, a gradient change measurement is performed based upon the test video input and a gradient change measurement map is provided.
1. A method of measuring a test video frame comprising:
providing a test video input;
providing an artifact measurement control;
performing a gradient change measurement based upon the test video input; and
providing a gradient change measurement map;
wherein the gradient change measurement comprises:
determining a gradient amplitude based upon the test video input;
determining a gradient magnitude based upon the test video input; and
determining a gradient direction based upon the test video input;
wherein the steps of determining the gradient amplitude, the gradient magnitude and the gradient direction are performed for each pixel of a frame from the test video input; and
wherein the gradient magnitude is determined using the largest absolute value of amplitude of four gradient filters.
2. The method of claim 1 , further comprising providing a reference video input along with the test video input and performing the gradient change measurement using both the test video input and the reference video input.
3. The method of claim 1 , further comprising performing nominal measurements based upon the test video input, and performing the gradient change measurement based upon a nominal measurements map.
4. The method of claim 3 , further comprising using a reference video input for making the nominal measurements.
5. The method of claim 1 , wherein the artifact measurement control provides gradient weights.
6. The method of claim 1 , further comprising providing the gradient change measurement map as a mask for further video measurements.
7. The method of claim 1 , further comprising providing a summary gradient change measurement.
8. The method of claim 1 , further comprising providing artifact measurement results.
9. The method of claim 1 , wherein determining the gradient magnitude comprises determining an absolute value for a gradient amplitude.
10. The method of claim 1 , wherein the gradient direction corresponds to the filter used in the step of determining the gradient magnitude and the sign of the corresponding gradient amplitude.
11. The method of claim 1 , wherein the gradient change measurement further comprises classifying a gradient change as either detail added, detail removed, or edges rotated based upon the gradient amplitude, the gradient magnitude, and the gradient direction.