Datasheet

PDF: 09005aef8202ec2e/Source: 09005aef8202ebf7 Micron Technology, Inc., reserves the right to change products or specifications without notice.
MT9D111__2_REV5.fm - Rev. B 2/06 EN
17 ©2004 Micron Technology, Inc. All rights reserved.
MT9D111 - 1/3.2-Inch 2-Megapixel SOC Digital Image Sensor
Architecture Overview
Micron Confidential and Proprietary
smaller than the default 1600 x 1200 window. Pixels outside the selected cropping win-
dow are not read out, which results in narrower field of view than at the default sensor
settings. Irrespective of the size and position of the cropping window, the MT9D111 sen-
sor core can also decimate outgoing images by skipping columns and/or rows of the
pixel array, and/or by binning 2 x 2 groups of pixels of the same color. Since decimation
by skipping (i.e. deletion) can cause aliasing (even if pixel binning is simultaneously
enabled), it is generally better to change image size only by cropping and pixel binning.
The image cropping and decimator module can be used to do digital zoom and pan. If
the decimator is programmed to output images smaller than images coming from the
sensor core, zoom effect can be produced by cropping the latter from their maximum
size down to the size of the output images. The ratio of these two sizes determines the
maximum attainable zoom factor. For example, a 1600 x 1200 image rendered on a
160 x 120 display can be zoomed up to 10 times, since 1600/160 = 1200/120 = 10. Pan-
ning effect can be achieved by fixing the size of the cropping window and moving it
around the pixel array.
YUV-to-RGB/YUV Conversion and Output Formatting
The YUV data stream emerging from the decimator module can either exit the color
pipeline as-is or be converted before exit to an alternative YUV or RGB data format. See
“Color Conversion Formulas” on page 115 and the description of register R151:1 for
more details.
JPEG Encoder and FIFO
The JPEG compression engine in the MT9D111 is a highly integrated, high-performance
solution that can provide sustained data rates of almost 80MB/s for image sizes up to
1600 x 1200. Additionally, the solution provides for low power consumption and full pro-
grammability of JPEG compression parameters for image quality control.
The JPEG encoding block is designed for continuous image flow and is ideal for low
power applications. After initial configuration for a target application, it can be con-
trolled easily for instantaneous stop/restart. A flexible configuration and control inter-
face allows for full programmability of various JPEG-specific parameters and tables.
JPEG Encoding Highlights
1. Sequential DCT (baseline) ISO/IEC 10918-1 JPEG-compliant
2. YCbCr 4:2:2 format compression
3. Programmable quantization tables
• One each for luminance and chrominance (active)
• Support for three pairs of quantization tables—two pairs serve as a backup for buffer
overflow
4. Programmable Huffman Tables
• 2 AC, 2 DC tables—separate for luminance and chrominance
5. Quality/compression ratio control capability
6. 15 fps MJPEG capability (header processing in external host processor)