AR0230 Datasheet, PDF (17/36 Pages) ON Semiconductor – Full HD Digital Image Sensor

AR0230CS: 1/2.7-Inch 2.1 Mp/Full HD Digital Image Sensor
Features Overview
Table 4:
List of Configurable Registers for Context A and Context B
Context A
Register Description
coarse_integration_time
line_length_pck
frame_length_lines
row_bin
col_bin
fine_gain
coarse_gain
x_addr_start
y_addr_start
x_addr_end
y_addr_end
y_odd_inc
x_odd_inc
green1_gain
blue_gain
red_gain
green2_gain
global_gain
operation_mode_ctrl
bypass_pix_comb
Context B
Register Description
coarse_integration_time_cb
line_length_pck_cb
frame_length_lines_cb
row_bin_cb
col_bin_cb
fine_gain_cb
coarse_gain_cb
x_addr_start_cb
y_addr_start_cb
x_addr_end_cb
y_addr_end_cb
y_odd_inc_cb
x_odd_inc_cb
green1_gain_cb
blue_gain_cb
red_gain_cb
green2_gain_cb
global_gain_cb
operation_mode_ctrl_cb
bypass_pix_comb_cb
Motion Compensation/DLO
In typical multi-exposure HDR systems, motion artifacts can be created when objects
move during the T1 or T2 integration time. When this happens, edge artifacts can poten-
tially be visible and might look like a ghosting effect. To correct this, the AR0230CS has
special 2D motion compensation circuitry that detects motion artifacts and corrects the
image. The motion compensation feature can be optionally enabled by register write.
Additional parameters are available to control the extent of motion detection and
correction as per the requirements of the specific application.
Tone Mapping
Real-world scenes often have a very high dynamic range (HDR) that far exceeds the elec-
trical dynamic range of the imager. Dynamic range is defined as the luminance ratio
between the brightest and the darkest objects in a scene. Even though the AR0230CS can
capture full dynamic range images, the images are still limited by the low dynamic range
of display devices. Today's typical LCD monitor has a contrast ratio around 1,000:1 while
it is not atypical for an HDR image having a contrast ratio of around 250,000:1. There-
fore, in order to reproduce HDR images on a low dynamic range display device, the
captured high dynamic range must be compressed to the available range of the display
device. This is commonly called tone mapping. The AR0230CS has implemented an
adaptive local tone mapping (ALTM) feature to reproduce visually appealing images that
increase the local contrast and the visibility of the images.
AR0230CS/D Rev. 8, Pub. 11/15 EN
17
©Semiconductor Components Industries, LLC, 2015.