Intel Corporation

Lawrence K Freytag

Michael J Keith

Judith A Goldstein

Bill A Munson

A method and apparatus for image data compression is disclosed. According to one embodiment, image data may be received at a digital video camera having an encoder and a transmitter. The encoder of the digital video camera may be used to compress the image data into an encoded information stream capable of carrying at least 8.5 frames/second in which no frame depends on a previous frame by performing intra frame encoding. The transmitter may transmit the encoded information stream from the digital video camera to a computer system via a Universal Serial Bus (USB) while consuming no more than approximately 4 Mbits/second of USB bandwidth.

Image data compression

A method and apparatus for video conferencing is disclosed. According to one embodiment, a Universal Serial Bus (USB) enabled digital video camera may output an encoded information stream. The USB-enabled digital video camera including an encoder may compress image data received by the USB-enabled digital video camera during a real-time video conference to produce the encoded information stream in which no frame of the encoded information stream may depend on a previous frame by performing intra frame encoding. A computer system coupled to the USB-enabled digital video camera via a USB may be used to decode the encoded information stream and to transmit the image data to one or more other computer systems as part of a video conferencing data stream.

Video conferencing

A method and apparatus for encoding a digital image is disclosed. A difference is calculated between a first sample from a current scan line and a corresponding second sample from a previous scan line. A quantization table level is selected from a quantization table that includes at least one level, and information identifying the selected level is placed into an information stream. A quantizer is selected from the quantization table level based on the calculated difference and information corresponding to the selected quantizer is place into the information stream.

Differential pulse code modulation image compression with varying levels of quantizers

A method and apparatus for encoding a digital image is disclosed. A differences is calculated between a first sample from a current scan line and a corresponding second sample from a previous scan line. A quantization table level is selected from a quantization table that at least one level, and information identifying the selected level is placed into an information stream. A quantizer is selected from the quantization table level based on the calculated difference and information corresponding to the selected quantizer is placed into the information stream.

DPCM image compression with plural quantization table levels

A circuit for analog chroma keying on color data permits display of graphics, generated from a computer system, and video on an output display. The analog chroma keying circuit receives the graphics signals and the video signals, wherein the graphics signals include color data to designate a color key. The analog chroma keying circuit includes a plurality of digital to analog converters that generate a plurality of color key limits for defining a range to detect the color data denoting the color key. The analog chroma keying circuit also includes a plurality of comparators coupled to receive the graphics signals and the color key limits for each primary color. The plurality of comparators generate a key on indicator when the graphics signals fall within the color key limits. The key on indicator is input to a plurality of analog switches that couples the graphics signals to the output display when the key on indicator indicates the graphics signals are not within the color key limits, and couples the video signals to the output display when the graphics signals are within the color key limits.

Growing community of inventors

Olympia, WA, United States of America

Lawrence K Freytag