The principle of real-time digital image acquisition is shown in Figure 1. In Figure 1, the OV7620 / 7120 chip from Omnivision chnologie s is used as the image acquisition chip. Its main feature is that the chip can provide 0.5 to 30 frames / s, 640 × 480 pixel dot matrix CMOS color or black and white digital images , Operating frequency is 27MHz, pixel clock is 27MHz; CY7C68013 of Cypress company is used as CPU control and USB2.0 interface chip, the main feature of this chip is to integrate USB2.0 core and engine, an enhanced 51 A series of microprocessors and programmable peripheral interface chips provide a highly efficient timing solution. Under this original structure, the low-cost 51 series microprocessors are still used, and the data transmission speed It can reach 56MB / s and can provide the maximum bandwidth of USB2.0. Therefore, in Figure 1, the CPU control and USB2.0 interface chip selected the above chip. The image data collected by the image chip (OV7620 / 7120) is sent to the FIFO buffer of CY7C68013 directly under the control of the 51CPU in the CY7C68013 at the set frequency (0.5 ～ 30 frames / s), and then by its internal The USB2.0 interface transfers its image data to the computer via a USB cable.
Figure 1 Block diagram of real-time digital image acquisition
Using USB2.0 MCU to Realize Real-time Collection of Full Digital Images
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