Discuss challenges of implementing imaging pipelines on mobile chipsets with ARM Mali T604 GPU as found in Samsung Exynos 5. Presented at HPC & GPU Supercomputing group of Silicon Valley (http://www.meetup.com/HPC-GPU-Supercomputing-Group-of-Silicon-Valley) on Dec. 12, 2013
‣ Use CL_MEM_ALLOC_PTR to avoid copy between CPU and GPU
Host data pointers
Global Memory
Buffer created by malloc()
CPU(Host)
GPU(Compute Device)
Buffers created by user (malloc) are notmapped into the GPU memory space
Global Memory
Buffer created by malloc()
CPU(Host)
Buffer created by clCreateBuffer()
GPU(Compute Device)
COPY clCreateBuffer(CL_MEM_USE_HOST_PTR)creates a new buffer and copies the data over(but the copy operations are expensive)
Host data pointers
Global Memory
Buffer created by malloc()
CPU(Host)
GPU(Compute Device)
Buffers created by user (malloc) are notmapped into the GPU memory space
Global Memory
Buffer created by malloc()
CPU(Host)
Buffer created by clCreateBuffer()
GPU(Compute Device)
COPY clCreateBuffer(CL_MEM_USE_HOST_PTR)creates a new buffer and copies the data over(but the copy operations are expensive)
Host data pointers
Global Memory
CPU(Host)
Buffer created by clCreateBuffer()
GPU(Compute Device)
clCreateBuffer(CL_MEM_ALLOC_HOST_PTR)creates a buffer visible by both GPU and CPU
� Where possible don’t use CL_MEM_USE_HOST_PTR– Create buffers at the start of your application– Use CL_MEM_ALLOC_HOST_PTR instead of malloc() – Then you can use the buffer on both CPU host and GPU
AR0833: 1/3.2-Inch 8Mp CMOS Digital Image SensorFeatures
Aptina Confidential and Proprietary Preliminary
Features
Interlaced HDR Readout
The sensor enables HDR by outputting frames where even and odd row pairs within a single frame are captured at different integration times. This output is then matched with an algorithm designed to reconstruct this output into an HDR still image or video.
The sensor HDR is controlled by two shutter pointers (Shutter pointer1, Shutter pointer2) that control the integration of the odd (Shutter pointer1) and even (Shutter pointer 2) row pairs.
AR0833: 1/3.2-Inch 8Mp CMOS Digital Image SensorFeatures
Aptina Confidential and Proprietary Preliminary
Features
Interlaced HDR Readout
The sensor enables HDR by outputting frames where even and odd row pairs within a single frame are captured at different integration times. This output is then matched with an algorithm designed to reconstruct this output into an HDR still image or video.
The sensor HDR is controlled by two shutter pointers (Shutter pointer1, Shutter pointer2) that control the integration of the odd (Shutter pointer1) and even (Shutter pointer 2) row pairs.
AR0833: 1/3.2-Inch 8Mp CMOS Digital Image SensorFeatures
Aptina Confidential and Proprietary Preliminary
Features
Interlaced HDR Readout
The sensor enables HDR by outputting frames where even and odd row pairs within a single frame are captured at different integration times. This output is then matched with an algorithm designed to reconstruct this output into an HDR still image or video.
The sensor HDR is controlled by two shutter pointers (Shutter pointer1, Shutter pointer2) that control the integration of the odd (Shutter pointer1) and even (Shutter pointer 2) row pairs.
