Abstract: This disclosure provides systems, methods, and devices for image signal processing that support hardware-based photographic and videographic effects. In a first aspect, a method of image processing includes receiving, by an image signal processor, first image data; and determining an output image frame based on the first image data by applying a photographic effect to a first image frame of the first image data in the image signal processor. Other aspects and features are also claimed and described.

Abstract: A pixel array for an image sensor is provided. The pixel array includes a dark pixel which is configured to detect a local dark current in an active pixel block. The dark pixel is distinguished from an optical black pixel block which is arranged around the active pixel block and is configured to detect a global dark current. The pixel array is configured to compensate for dark shading, which is not compensated through global dark current compensation, using the local dark current output from the dark pixel which is arranged within the active pixel block.

Abstract: A method of compensating for dark signal in an image signal, the method including generating a dark signal model from a dark signal measurement, the dark signal being a digital signal representing a dark frame captured by an image sensor when shielded from exposure to light; and estimating the dark signal present in an object signal using the dark signal model, the object signal being a digital signal representing an object frame captured by the image sensor when exposed to light.

Abstract: A pixel array for an image sensor is provided. The pixel array includes a dark pixel which is configured to detect a local dark current in an active pixel block. The dark pixel is distinguished from an optical black pixel block which is arranged around the active pixel block and is configured to detect a global dark current. The pixel array is configured to compensate for dark shading, which is not compensated through global dark current compensation, using the local dark current output from the dark pixel which is arranged within the active pixel block.