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Image sensor with cropping

An image sensor and image sensor technology, applied in the field of cameras, can solve problems such as different timing and bus instability

Inactive Publication Date: 2005-01-05
LOGITECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, due to bus instability, the timing of when these bytes are sent across the bus will vary

Method used

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  • Image sensor with cropping
  • Image sensor with cropping
  • Image sensor with cropping

Examples

Experimental program
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Embodiment Construction

[0029] Fig. 4 is a block diagram of a video camera to which the invention is applied. The system includes a lens 10 and a sensor array, like a CCD assembly 12, such as figure 1 As shown, connect to USB20.

[0030] Signals from the CCD integrated circuit block are provided to an analog front end 40, including a differential amplifier or correlated double sampler (CDS) 42, which provide the analog signal to an automatic gain control circuit AGC 44, which in turn provides an analog- Digital converter ADC46.

[0031] These digitized signals are directly supplied to the digital processing circuit 48 without being stored in the frame buffer memory. They are first sent to the video digital signal processor 50 for compression, trimming, scaling and other functions such as filtering. Once processed, the digital data is sent to a line buffer 52 . The line buffer 52 stores single line data from the horizontal shift register of the CCD IC block 12 .

[0032]Data from row buffer 52 is...

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PUM

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Abstract

An image sensor (102) which can output only desired portions of an image. Thus, the image is essentially cropped at the time it is produced, eliminating the generation of data from the image sensor (102) corresponding to undesired portions of the data. This reduces the storage requirements for data being digitally processed, reducing or eliminating the need for a frame buffer memory. In a preferred embodiment, a single silicon chip (100) including a CCD array (102) includes a number of registers (112) which can be programmed for each frame to indicate which lines should be read out. Within each line, the chip (100) can be controlled by timing pulses to quickly read out data before or after the desired cropped portion of the image, with the quickly read data simply being discarded. The actual data desired can then be read out at a slower clock rate to allow processing on the fly.

Description

technical field [0001] The invention is applicable to image sensors, especially video cameras connected to something like a Universal Serial Bus (USB). Background technique [0002] The ability to acquire and store still life as well as digital photographs for video is becoming more and more important. Digital images can be manipulated on computers and can also be transmitted via the Internet. The high cost of digital video cameras has limited its widespread use, and cameras are accepted for their lower costs. [0003] figure 1 is a high-level block diagram of a typical video camera, light is received through a lens 10 and transmitted to a sensor array 12, such as a charge-coupled device (CCD) array. The detected signal is then sent to an analog front-end circuit 14, which amplifies and processes the signal to convert it into digital form. The digitized signal is then stored in frame buffer memory 16 . [0004] The image is processed in digital form by processing circui...

Claims

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Application Information

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IPC IPC(8): H04N5/345H04N5/3728
CPCH04N3/1562H04N25/443H04N25/73
Inventor 马克·苏米切尔·诺克罗斯乔治斯·奥伯格里米·齐默尔曼
Owner LOGITECH