Efficient bi-directional image scaling

An apparatus for processor-implemented method, comprising:

• at least one memory;
• and
• at least one processor coupled to the at least one memory, the at least one processor configured to:
• receive a digital image including at least a portion to be scaled;
• sample a set of pixels of the portion to be scaled in a horizontal direction;
• and
• bi-directionally scale the sampled set of pixels by:
• applying a horizontal scaling parameter to the sampled set of pixels to compute a horizontally scaled value;
• accumulating the horizontally scaled value until a counter is equal to a vertical scaling parameter;
• computing a bi-directionally scaled value by applying the vertical scaling parameter to the accumulated horizontally scaled value;
• and
• storing the bi-directionally scaled value.

A non-transitory computer-readable medium having program code recorded thereon, the program code executed by one or more processors and comprising:

• program code to receive a digital image including at least a portion to be scaled;
• program code to sample a set of pixels of the portion to be scaled in a horizontal direction;
• and
• program code to bi-directionally scale the sampled set of pixels by:
• applying a horizontal scaling parameter to the sampled set of pixels to compute a horizontally scaled value;
• accumulating the horizontally scaled value until a counter is equal to a vertical scaling parameter;
• computing a bi-directionally scaled value by applying the vertical scaling parameter to the accumulated horizontally scaled value;
• and
• storing the bi-directionally scaled value.

An apparatus for processor-implemented method, comprising:

• means for receiving a digital image including at least a portion to be scaled;
• means for sampling a set of pixels of the portion to be scaled in a horizontal direction;
• and
• means for bi-directionally scaling the sampled set of pixels by:
• applying a horizontal scaling parameter to the sampled set of pixels to compute a horizontally scaled value;
• accumulating the horizontally scaled value until a counter is equal to a vertical scaling parameter;
• computing a bi-directionally scaled value by applying the vertical scaling parameter to the accumulated horizontally scaled value;
• and
• storing the bi-directionally scaled value.