C/C++Program Design - SUSTech
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Transcript of C/C++Program Design - SUSTech
ARM Development Board
ARM• ARM (previously an acronym for Advanced RISC Machine and
originally Acorn RISC Machine) is a family of reduced instruction set computing (RISC) architectures for computer processors1.• ARM is the most widely used instruction set architecture (ISA) and the
ISA produced in the largest quantity.
1. https://en.wikipedia.org/wiki/ARM_architecture
Raspberry Pi 4• Broadcom BCM2711, Quad core
Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz• 2GB, 4GB or 8GB LPDDR4-3200
SDRAM (depending on model)• 2.4 GHz and 5.0 GHz IEEE 802.11ac
wireless, Bluetooth 5.0, BLE• Gigabit Ethernet• 2 USB 3.0 ports; 2 USB 2.0 ports.• Raspberry Pi standard 40 pin GPIO
header (fully backwards compatible with previous boards)• 2 ×micro-HDMI ports (up to
4kp60 supported)
https://www.raspberrypi.org/
EAIDK-310
• ARM 4-core 64-bit, Cortex-A53，1.3GHz• LPDDR3 1GB RAM• 802.11 ac/a/b/g/n, 2.4G/5GHz• 1xUSB3, 3xUSB2, 1xMicro-USB• Bluetooth 5.0
http://www.eaidk.com/
How to develop programs with ARM Development boards
Almost the same with a PC with Linux OS.• gcc/g++• Makefile• cmake
Some Tricks in OpenCV
What’s an image?
cv:Mat class
• Matrix: 2D array? Much more than that.
• modules/core/include/opencv2/core/mat.hpp
class CV_EXPORTS Mat{public:
// some functionsint rows, cols;//pointer to datauchar* data;//size_t step.pMatStep step;
};
cv:Mat class
… … int flags int dims int rows int cols
uchar* data int* refcount
… … …
Matrix data Ref count
step in cv::Mat
•How many bytes for a row of Matrix 4(row)x3(col)?Ø Can be 3, 4, 8, and any other values >=3.Ø Memory alignment for SIMD
ROI: Region of interest • Mat A
Ø rows=100Ø cols=100Ø step=100Ø data=0xABCDEF00
• Mat BØ rows=100Ø cols=100Ø step=100Ø data=0xABCDEF00
• Mat BØ rows=30Ø cols=28Ø step=100Ø data=0xABCE0698
A
B
C
Mat
Matrix Data
