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TNETV6446AINZWT Datasheet(PDF) 159 Page - Texas Instruments |
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TNETV6446AINZWT Datasheet(HTML) 159 Page - Texas Instruments |
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159 / 227 page  TMS320DM6446 www.ti.com SPRS283H – DECEMBER 2005 – REVISED SEPTEMBER 2010 6.13.1.2 Preview Engine The preview engine transforms raw unprocessed image/video data from a sensor (CMOS or CCD) into YCbCr 4:2:2 data. The output of the preview engine is used for both video compression and external display devices such as a NTSC/PAL analog encoder or a digital LCD. The following features are supported by the preview engine. • Accepts conventional Bayer pattern formats. • Input image/video data from either the CCD/CMOS controller or the DDR2 memory. • Output width up to 1280 pixels wide. • Automatic/mandatory cropping of pixels/lines when edge processing is performed. If all the corresponding modules are enabled, a total of 14 pixels per line (7 left most and 7 right most) and 8 lines (4 top most and 4 bottom most) will not be output. • Simple horizontal averaging (by factors of 2, 4, or 8) to handle input widths that are greater than 1280 (plus the cropped number) pixels wide. • Dark frame capture to DDR2. • Dark frame subtraction for every input raw data frame, fetched from DDR2, pixel-by-pixel to improve video quality. • Lens shading compensation. Each input pixel is multiplied with a corresponding 8-bit gain value and the result is right shifted by a programmable parameter (0-7 bits). • A-law decompression to transform non-linear 8-bit data to 10-bit linear data. This feature allows data in DDR2 to be 8-bits, which saves 50% of the area if the input to the preview engine is from the DDR2. • Horizontal median filter for reducing temperature induced noise in pixels. • Programmable noise filter that operates on a 3x3 grid of the same color (effectively, this is a five line storage requirement). • Digital gain and white balance (color separate gain for white balance). • Programmable CFA interpolation that operates on a 5x5 grid. • Conventional Bayer pattern RGB and complementary color sensors. • Support for an image that is downsampled by 2x in the horizontal direction (with and without phase correction). In this case, the image is 2/3 populated instead of the conventional 1/3 colors. • Support for an image that is downsampled by 2x in both the horizontal and vertical direction. In this case, the image is fully populated instead of the conventional 1/3 colors. • Programmable RGB-to-RGB blending matrix (9 coefficients for the 3x3 matrix). • Fully programmable gamma correction (1024 entries for each color held in an on-chip RAM). • Programmable color conversion (RGB to YUV) coefficients (9 coefficients for the 3x3 matrix). • Luminance enhancement (non-linear) and chrominance suppression & offset. The Preview Engine register memory mapping is shown in Table 6-49. Copyright © 2005–2010, Texas Instruments Incorporated Peripheral and Electrical Specifications 159 Submit Documentation Feedback Product Folder Link(s): TMS320DM6446 |
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