Scaler de-ringing in image processing circuitry
Methods and systems include receiving, at de-ringing circuitry of a display pipeline of an electronic device, scaled image content based on image data. The de-ringing circuitry also receives a fallback scaler output. The de-ringing circuitry determines whether the image data has a change frequency greater than a threshold. In response to the change frequency being above the threshold, the de-ringing circuitry determines a weight. Based at least in part on the weight, the de-ringing circuitry blends the scaled image content and the fallback scaler output based at least in part on the weight.
1. A method, comprising:
receiving, at de-ringing circuitry of a display pipeline of an electronic device, scaled image content based on image data, wherein the scaled image content comprises linearly scaled content;
receiving, at the de-ringing circuitry, a fallback scaler output, wherein the fallback scaler output comprises non-linearly scaled content;
determining whether the image data has a change frequency greater than a threshold, wherein the change frequency comprises differences between adjacent pixels using pixel difference circuitry that comprises a plurality of subtractors and absolute value circuitries configured to determine sign-less differences between the adjacent pixels in the image data;
in response to the change frequency being above the threshold, determining a weight based on the linearly scaled content and the non-linearly scaled content; and
blending the scaled image content and the fallback scaler output based at least in part on the weight.
2. The method of claim 1 , wherein the scaled image content is scaled in a scaler of the display pipeline.
3. The method of claim 2 , wherein the scaled image content comprises horizontally scaled image content from the scaler, wherein the scaler comprises a horizontal scaler.
4. The method of claim 2 , wherein the scaled image content comprises vertically scaled image content from the scaler, wherein the scaler comprises a vertical scaler.
5. The method of claim 1 , comprising receiving the image data at the de-ringing circuitry.
6. The method of claim 1 , wherein determining whether the change frequency is greater than the threshold comprises determining whether the change frequency is lower than an additional threshold.
7. The method of claim 6 , wherein determining the weight comprises determining a bin based at least in part on the change frequency being between the threshold and the additional threshold.
8. The method of claim 7 , wherein determining the weight is based at least in part on the bin.
9. A display pipeline system of an electronic device, comprising:
scaler circuitry configured to generate scaled image content by scaling image data using a first scaling process and to generate a fallback scaler output using a second scaling process, wherein the first scaling process comprises linear scaling, and the second scaling process comprises non-linear scaling; and
de-ringing circuitry comprising pixel difference circuitry, coupled to the scaler circuitry and configured to:
receive the scaled image content from the scaler circuitry;
receive the fallback scaler output from the scaler circuitry;
determine a change frequency of the image data, wherein determining the change frequency comprises determining differences in adjacent pixels in the image data using a plurality of subtractors and absolute value circuitries to determine sign-less differences between the adjacent pixels in the image data;
blend the scaled image content and the fallback scaler output using one or more weights based on the change frequency; and
output de-ringed scaled content based on the change frequency, the one or more weights, the scaled image content, and the fallback scaler output.
10. The display pipeline system of claim 9 , wherein the de-ringing circuitry comprises additional scaler circuitry, wherein the scaler circuitry is configured to scale the image data in a vertical direction, and the additional scaler circuitry is configured to scale the image data in a horizontal direction.
11. The display pipeline system of claim 9 , wherein the scaler circuitry uses linear-interpolation-based scaling to generate the scaled image content.
12. The display pipeline system of claim 9 , wherein the de-ringing circuitry is configured to receive the image data.
13. The display pipeline system of claim 9 , wherein the de-ringing circuitry comprises frequency detection circuitry configured to determine the change frequency based at least in part on the sign-less differences between the adjacent pixels.
14. The method of claim 1 , wherein the fallback scaler output corresponds to a first level of scaling, and the scaled image content corresponds to a second level of scaling.
15. The method of claim 14 , wherein the first level of scaling is lower than the second level of scaling.
16. The display pipeline system of claim 9 , wherein the fallback scaler output corresponds to a first level of scaling, and the scaled image content corresponds to a second level of scaling.