Abstract: Provided are a bulk acoustic resonator and a filter. The bulk acoustic resonator includes a substrate having a cavity, and a bottom electrode, a piezoelectric layer and a top electrode that are sequentially arranged on the substrate, where an overlapping area of orthographic projections of the bottom electrode, the piezoelectric layer and the top electrode on the substrate forms a resonance area; and in the resonance area, an outline shape of the orthographic projection of each of the bottom electrode and the top electrode on the substrate is a closed figure formed by connecting M arcs end to end, and the closed figure is an axisymmetric figure, where M is an integer greater than or equal to 2, and the arcs include a concave arc that is concave toward a center of the resonance area and a convex arc that is convex away from the center of the resonance area.

Abstract: A method for calculating a feature descriptor on a single instruction, multiple data (SIMD) processor is described. The method includes generating histogram bin indexes in a first register. The method also includes generating weights in a second register. The method further includes updating an entire histogram table in a register file based on the histogram bin indexes and the weights without storing any histogram bin to memory. Histogram bins are updated in parallel with a single instruction.

Abstract: A method for calculating a feature descriptor on a single instruction, multiple data (SIMD) processor is described. The method includes generating histogram bin indexes in a first register. The method also includes generating weights in a second register. The method further includes updating an entire histogram table in a register file based on the histogram bin indexes and the weights without storing any histogram bin to memory. Histogram bins are updated in parallel with a single instruction.

Abstract: A particular method includes generating a first result of a first integration operation performed on a first subset of elements of the plurality of elements. The first integration operation is associated with a first level of integration. The method includes generating a second result of a second integration operation performed on the first subset of elements. The second integration operation is associated with a second level of integration. The method further includes performing a third integration operation on a second subset of elements of the plurality of elements. The third integration operation is associated with the second level of integration. The third integration operation is performed based on the first result and the second result.

Abstract: A particular method includes generating a first result of a first integration operation performed on a first subset of elements of the plurality of elements. The first integration operation is associated with a first level of integration. The method includes generating a second result of a second integration operation performed on the first subset of elements. The second integration operation is associated with a second level of integration. The method further includes performing a third integration operation on a second subset of elements of the plurality of elements. The third integration operation is associated with the second level of integration. The third integration operation is performed based on the first result and the second result.