H04N 25/40

Definition

(Für diese Definition ist die deutsche Übersetzung noch nicht abgeschlossen)

Details of extracting pixel data from an image sensor by controlling scanning circuits, for example:

scanning individual pixels or pixel regions;

using specific scanning sequences, like scanning in blocks, pyramidal, in different directions;

scanning and reading out data from a pixel while the pixel accumulates new charges or scanning or reading out data from a block, while the block processes the next data, normally additional storage elements like double buffers or parallel processing circuits are used, e.g. reading a pixel while the next exposure is running, reading out digital ADC data while the ADC is running the next conversion cycle, etc.

scanning for high-speed operations where number of frames are successively captured and stored in the sensor and then readout from the memories;

reading out more than one sensor

• for increasing the field of view by combining the outputs of two or more sensors, e.g. panoramic imaging
• having different imaging characteristics, e.g. exposure time, aperture size, gain, resolution or colour

for performing data compression

• by compressive sensing or sparse sampling
• by DCT or wavelet transforms
• by data differencing

by controlling the frame rate

• of different regions of the image array
• the regions being variable

for extracting focusing pixel data;

by non-destructive readout to read signals two or more times during the integration time of the pixel. The figure shows non-destructive readouts at time instants from T1 to T7, while the pixel signal (72, 74 or 76) increases as a result of the exposure during the integration time T

for performing global operations, e.g. histogramming, sorting, region segmentation/labelling, convolution functions

• for detecting maximum or minimum level

adapted to implement artificial neural networks [ANNs];

for push broom scanning or together with relative movement.

Querverweise

Informative Querverweise

Spezielle Klassifizierungsregeln

In addition to classification in H04N 25/40, classification should also be made in H04N 25/74 or H04N 25/779 when specific details of the scanning circuits are provided.

The readout operations in most of cases influence the exposure time of the pixels. Accordingly, classification should also be made in H04N 25/53 when details related to the control of the exposure/integration time are disclosed.