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An endoscope system is more than just a tiny camera at the tip of a flexible tube. Behind the scenes, a dedicated circuit board processes the raw image data from the endoscope camera module, converts it into a viewable video signal, and often handles storage and display functions. This board is commonly called a DSP board (Digital Signal Processor board). In this article, we explain what a DSP board does, why it is essential for modern endoscope systems, and how it differs from simply using a USB Camera Module.
A DSP board is an electronic circuit that takes the raw digital output from a module camera sensor and performs real‑time image processing. The sensor inside an endoscope camera module captures Bayer pattern or raw RGB data. This raw data is not directly viewable; it must be demosaiced, white‑balanced, colour corrected, and often compressed. The DSP board handles these tasks, outputting a standard video format such as HDMI, composite video (CVBS), or USB video.
In older endoscope systems, the DSP board was a large, separate box. Today, it can be as small as a postage stamp and integrated into the camera housing or the main processor unit. For a 4k endoscope camera module, the DSP board must be powerful enough to process 4K video at 30 or 60 frames per second.
Raw Image Processing – Converts the raw Bayer data from the CMOS sensor into a full‑colour image. This includes demosaicing, colour interpolation, and white balance.
Image Enhancement – Applies sharpening, noise reduction, contrast adjustment, and edge enhancement to improve visual quality.
Video Encoding – Compresses the video stream (e.g., H.264 or H.265) for recording or streaming.
On‑Screen Display (OSD) – Overlays text, cross‑hairs, timestamps, or measurement graphics onto the live video.
Output Formatting – Converts the processed video to a standard interface: HDMI, SDI, USB (UVC), or analog (CVBS).
Storage Control – Manages saving images or video clips to a microSD card, USB drive, or internal memory.
Many consumer USB endoscopes use a USB Camera Module that incorporates a small DSP (or a bridge chip with basic processing) directly on the camera board. This is sufficient for low‑cost inspection cameras because the host computer (PC, laptop, or smartphone) handles the heavy video processing. However, for professional or medical endoscope systems, a dedicated DSP board offers several advantages:
No dependency on external PC – The system can output to a standalone monitor without a computer.
Lower latency – Processing is done in hardware, not on a general‑purpose operating system.
Advanced features – Measurement tools, image freezing, PIP (picture‑in‑picture), and recording are built into the DSP board.
Consistent performance – Not affected by the host’s CPU load or driver updates.
A custom endoscope camera module paired with a dedicated DSP board is the standard approach for medical laparoscopes, industrial borescopes, and high‑end video endoscopes.
Feature | DSP Board + Standalone Camera Module | USB Camera Module |
|---|---|---|
Host computer required | No (outputs to monitor directly) | Yes (PC, laptop, or phone needed) |
Latency | Very low (hardware processing) | Moderate (USB + OS stack) |
Image processing | High‑quality dedicated ISP | Relies on host software (e.g., OpenCV) |
Portability | Self‑contained system | Lightweight, but needs a computer |
Measurement tools | Often built‑in (on‑screen graphics) | Must be implemented in software |
Cost | Higher (additional board) | Lower |
Typical use | Medical, professional industrial | Consumer DIY, semi‑professional |
A modern DSP board for an endoscope camera module contains:
Image processor – A dedicated ISP chip (e.g., from Ambarella, Novatek, or Nextchip).
Microcontroller – Manages button inputs, OSD menus, and overall system control.
Video encoder – Hardware H.264/H.265 encoder for recording.
Memory – SDRAM for frame buffering; flash for firmware.
Output interfaces – HDMI, CVBS, USB (device or host), and sometimes Ethernet.
Storage slot – microSD card socket.
Power supply – Regulators for the camera module and DSP.
The endoscope camera module (containing a module camera sensor and a lens) sends raw video data over a flexible cable – usually in LVDS or MIPI CSI‑2 format.
The DSP board receives this raw data. It first performs black level correction, defective pixel correction, and lens shading correction.
The raw Bayer data is demosaiced into RGB, then converted to YUV colour space.
Image enhancement (sharpening, noise reduction, contrast) is applied.
OSD graphics are overlaid.
The final video is encoded (if recording) and output to the display (HDMI, CVBS) or to a host computer via USB.
User controls (buttons, joystick, touch screen) are read by the microcontroller, which adjusts parameters (zoom, brightness, colour mode).
A 4k endoscope camera module requires a DSP board capable of handling 4K resolution at 30 or 60 fps. The data rate is massive – about 12 Gbps for uncompressed 4K at 30 fps. Therefore, the DSP must have:
A high‑bandwidth MIPI receiver (4 lanes, each 1.5 Gbps or more).
A powerful ISP core with 4K demosaicing and scaling.
Fast memory (DDR3 or DDR4) to buffer frames.
H.265 encoder for efficient storage.
Several chipsets from Ambarella (e.g., S5L, H22), Novatek, or Hisilicon are commonly used in professional 4K endoscope systems.
For OEM customers, a custom endoscope camera module can be paired with a specifically tuned DSP board. The manufacturer can adjust:
White balance curves for the particular LED illumination.
Noise reduction strength based on the sensor’s noise profile.
OSD menu layout and measurement tools.
Output resolution and frame rate.
This integration ensures that the whole system – from the tip to the display – is optimised for the intended clinical or industrial application.
If your endoscope system already includes a PC or a tablet (e.g., for image archiving, telemedicine, or AI analysis), a USB Camera Module may be more convenient. The USB module has a small built‑in bridge chip that outputs UVC video, and the host PC handles all processing, recording, and measurement. This reduces hardware cost and complexity. However, you sacrifice low latency and independence from a computer.
At Sincere, we design and manufacture both endoscope camera modules and companion DSP boards. Our product range includes:
Standalone DSP boards for 1080p and 4k endoscope camera module, with HDMI and CVBS outputs.
USB Camera Module based solutions for PC‑connected systems.
Custom endoscope camera module paired with custom DSP firmware (OSD, measurement tools, user interface).
We can also integrate a module camera sensor of your choice (Sony IMX, OmniVision) with a DSP board tailored to your clinical or industrial environment.
A DSP board is the brain of an endoscope system. It takes raw video from the endoscope camera module, processes it into a high‑quality image, adds graphics, and outputs to a display or recorder. For professional medical and industrial endoscopes, a dedicated DSP board offers low latency, advanced features, and independence from a PC. A 4k endoscope camera module demands a powerful DSP capable of handling massive data rates. While a USB Camera Module is a simpler, lower‑cost alternative for consumer or semi‑professional use, a custom endoscope camera module paired with a purpose‑built DSP board delivers the performance and reliability required in operating rooms and factory floors.
If you need a custom endoscope camera module or a complete endoscope system with a DSP board, contact Sincere. We provide end‑to‑end design and manufacturing services.
