Specifications

48 Issue Date: 2004/11/05 │ CONFIDENTIAL
CL765 │ Camera Application Processor
Datasheet │ Doc. #: CLQP-DS-743
4.7. JPEG DECODING
The CL765 can decode JPEG file of Baseline format, the most used among JPEG
formats. It is available to decode images up to VGA in maximum. Followings are
the YCbCr formats supported.
-. YCbCr 4:4:4
-. YCbCr 4:2:2
-. YCbCr 4:1:1
-. YCbCr 4:2:0
4.7.1. Still JPEG Decoding
JPEG Decoding supports resolution up to 3 Mega-Pixel in maximum. In case the
size of JPEG file is larger than the capacity of the JPEG buffer, it should be
decoded in use of Flow Control. For the JPEG buffer size, it is available to use the
whole SRAM area except Video buffer area (If OSD Preview is used, OSD Buffer
area should be also excluded from JPEG buffer area). Followings are the order of
JPEG Decoding.
1) JPEG Resolution check: check the JPEG resolution in use of S/W.
2) Select the decoding area according to JPEG Resolution.
3) If the size of JPEG file is larger than JPEG buffer area, Flow control should be
used.
4) Perform JPEG Decoding and setup Register 0x00.
5) Read data of JPEG File in use of Flow Control.
6) Complete JPEG file Flow Control and Decoding.
4.7.2. MJPEG Decoding
MJPEG Decoding procedure is same with Still JPEG Decoding procedure.
Followings are the order of decoding.
1) MJPEG Resolution check: checks JPEG Resolution in use of S/W.
2) Select decoding area according to MJPEG Resolution.
3) If the size of MJPEG file is larger than JPEG buffer area, Flow control should
be used.
4) Perform MJPEG Decoding and setup Register 0x00.
5) Read data of MJPEG File in use of Flow Control.
6) Complete MJPEG file Flow Control and Decoding.