Device for detecting and illuminating the vasculature using an FPGA

A vein imaging device configured to obtain and project an image of subcutaneous veins onto a patient to overlie the imaged veins, said vein imaging device comprising:

• a first laser configured to emit a beam of light at an infrared wavelength;
• a second laser configured to emit a beam of light at a visible wavelength;
• an x-mirror;
• an x-mirror driver;
• a y-mirror;
• a y-mirror driver;
• a field programmable gate array (FPGA), said FPGA configured to control said x-mirror driver and said y-mirror driver to control said first laser, said second laser, said x-mirror and said y-mirror to selectively scan each of said beam of light at said infrared wavelength and said beam of light at said visible wavelength onto the patient in a first direction and then in a second direction, to form lines, and to scan said lines in a third direction to thereby form a pattern of said infrared wavelength of light and said visible wavelength of light;
• wherein said FPGA is further configured to receive feedback of a state of said first laser and a state of said second laser, to form a closed loop to control an output of said first laser and to control an output of said second laser;
• a photodiode configured to receive a vein image formed from said scanned pattern of said infrared wavelength of light, and further configured to convert the received vein image into an analog signal;
• a front end circuit, said front end circuit configured to provide analog filtering, gain control, and threshold of the analog signal;
• an analog to digital converter (ADC), said ADC configured to convert the analog signal to a digital signal;
• wherein said FPGA is further configured to receive the digital signal and to perform vein image processing of an image frame of said received vein image, said vein image processing comprising:
• said FPGA being configured to collect pixel data from said photodiode, to perform an X-direction sum of pixel data for a plurality of boundary windows comprising:
• a matrix of pixels, and to place said X-direction sum into an X-sum buffer, to perform a Y-direction sum of pixel data for said plurality of boundary windows, and to place said Y-direction sum into a Y-sum buffer, and to use a total sum generator to obtain box filter output for each of said plurality of windows being the X-sum buffer added to the Y-sum buffer;
• wherein said FPGA is further configured to control said x-mirror driver and said y-mirror driver to control said first laser, said second laser, said x-mirror and said y-mirror, to scan said visible wavelength within said beam for projection of said processed vein image onto the patient;
• and
• wherein said FPGA is further configured to set said analog filtering and gain, to control said front end circuit.