A Realization Method of High Dynamic Range Imaging of Cooling Thermal Infrared Camera
An infrared thermal imager, high dynamic range technology, applied in image communication, color TV parts, TV system parts and other directions, can solve the complete scene of infrared thermal imager with low dynamic range and large temperature change range Clear imaging and other issues, to achieve the effect of improving signal-to-noise ratio and sensitivity, and good imaging effect
Active Publication Date: 2021-06-08
NANJING UNIV OF SCI & TECH
View PDF6 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The purpose of the present invention is to provide a method for realizing high dynamic range imaging of a cooling type infrared thermal imager, which overcomes the shortcomings of a low dynamic range of an infrared thermal imager and cannot completely and clearly image scenes with a large temperature range, and at the same time improves the infrared The signal-to-noise ratio of the output signal of the external imaging system,
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0044] The input image with a resolution of 320×256 and a bit width of 14 bits is used. The model of the FPGA used is 5CEFA5C19I7. The cooled infrared thermal imager used is SOFRADIR’s MARS-LW-RM3. The clock frequency for the detector is 6MHz, output a frame of image every 30000 clocks, the detector adopts four-way output.
[0045] Use the integration time parameters of 10μs, 200μs and eight different integration time parameters to divide the imaging three times, and collect the final images obtained under different integration time conditions. The obtained results are as follows: figure 2 As shown in (a), (b) and (c), it can be seen from the image that there is a high-temperature object soldering iron in the observed scene. When the integration time is short, the tip of the soldering iron is not saturated, and relevant details can be seen, but the text next to it is blurred, the contrast is low, and cannot be clearly distinguished; when the integration time is high, the text...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for realizing high dynamic range imaging of a cooling-type infrared thermal imager. Firstly, the image output by the cooling-type infrared thermal imager takes 8 frames of images as a cycle, and secondly, each frame of the obtained image is passed through an The uniformity correction module obtains the corrected image; then the corrected image passes through a divider with a divisor of 8, and the numerical value of the image becomes one-eighth of the original value; then all images in each cycle of the divider are calculated And stored in LPDDR2, when the accumulation of 8 frames of images in the same cycle is completed, the re-accumulation of the next cycle will start; finally, when the first frame image and the fifth frame image of the same cycle arrive, respectively. The image in LPDDR2 is read and sent to the subsequent image processing module, and finally the video image is output. The invention effectively expands the adaptability of the infrared thermal imager to scenes with a large temperature range, can acquire more scene information, and expands the application field of the infrared thermal imager.
Description
technical field [0001] The invention belongs to the field of infrared image processing, in particular to a method for realizing high dynamic range imaging of a cooling type infrared thermal imager. Background technique [0002] The original image generated by the thermal imaging camera has a narrow dynamic range and relatively concentrated grayscale. Due to the limited charge storage capacity of the integration capacitor of the readout circuit in the focal plane detector component, the detector integration time is limited. At that time, the high-temperature object is already saturated. [0003] Austin et al. first proposed the concept of infrared image super-frame technology. Infrared image super-frame technology refers to the acquisition of multiple frames of images within the single-frame imaging time specified by the infrared imaging system, and then replaces the saturated pixels of each pixel in the sub-frame with a long integration time with pixels of a short integrat...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/33H04N5/217H04N5/235
CPCH04N5/33H04N25/63H04N23/741
Inventor 隋修宝刘博文王利平陈钱顾国华朱亮亮于雪莲刘郭新匡小冬蒋桐
Owner NANJING UNIV OF SCI & TECH