System and method for processing a video signal with reduced latency
View Patent ↗Disclosed is a video processor for a magnifier camera. In particular, the disclosure relates to a video processor that eliminates the use of a frame buffer. This, in turn, reduces the latency otherwise present in the video signal. The disclosed video processor also allows selected portions of the display to be shaded. This highlights the non-shaded portions of the display while at the same time allowing the entire object to be perceived by the user.
1. A camera system with reduced latency for use by a blind or low vision (“BLV”) user, the system being used to highlight selected lines of textual material, the system comprising:
an adjustably mounted high definition camera, the camera being adjustable to view lines of textual material placed beneath the camera, the camera generating a corresponding video signal of the textual material, the video signal comprising a series of frames, with each frame comprising an array of pixels;
a field programmable gate array (FPGA) in electrical communication with the camera, the FPGA storing an associated look-up table for use in processing the video signal on a pixel by pixel basis, the look-up table specifying the portion of the array to be shaded and the degree of translucence to be applied, with the translucence being such that the underlying textual material is not masked, and wherein the shaded portions of the array function to highlight the non-shaded portion of the array and thereby facilitate viewing of the selected lines of the textual material by the BLV user, the FPGA being characterized by the absence of a video buffer;
a monitor for displaying the video signal with the shaded textual material.
2. A camera system with reduced latency for use by a blind or low vision (“BLV”) user, the system being used to highlight selected areas of an object, the system comprising:
a camera for viewing the object, the camera generating a corresponding video signal of the object, the video signal comprising a series of frames, with each frame comprising an array of pixels;
a microprocessor in electrical communication with the camera, the microprocessor storing an associated look-up table for use in processing the video signal on a pixel by pixel basis, the look-up table specifying the portion of the array to be shaded, with the shaded portions of the array functioning to highlight the non-shaded portion of the array and thereby facilitate viewing of the selected areas of the object by the BLV user, the microprocessor being characterized by the absence of a video buffer;
a monitor for displaying the video signal.
3. The system as described in claim 2 wherein the look-up table specifies the degree of translucence to be applied, with the translucence being such that the underlying textual material is not masked.
4. The system as described in claim 2 wherein the object being viewed is lines of textual material.
5. The system as described in claim 4 wherein the non-shaped portion of the array corresponds to one or more horizontal lines of textual material.
6. The system as described in claim 2 wherein the microprocessor is a field programmable gate array.
7. The system as described in claim 2 wherein the camera is adjustably mounted on a flexible arm.
8. A system for processing a video signal comprising:
a camera for viewing an object and generating a corresponding video signal, the video signal comprising a frame made up of an array of pixels;
a microprocessor and an associated look-up table for processing the video signal, the processing applying a pre-determined visual characteristic to the frame, the processing being carried out on a pixel by pixel basis, thereby eliminating the need for the frames to be stored in a video buffer;
a monitor for displaying the video signal with the pre-determined visual characteristic;
wherein the pre-determined visual characteristic is shading that highlights the non-shaded portions of the array and which thereby facilitates viewing by the low-vision user.