Sony Patents a Brightness-Correction System for Medical Cameras That Use Glowing Dyes
Fluorescence cameras used in surgery can produce images where the edges look dimmer than the center, making it harder to spot exactly what a surgeon needs to see. Sony's patent tackles that problem with a correction system that treats each color of fluorescent light as its own separate case.
What Sony's fluorescence image correction actually does
A surgical camera illuminates tissue with special light, and the glowing response gets captured as an image. But the image often looks brighter in the center and dimmer toward the edges, a quirk called shading. That uneven glow is not a reflection of reality; it is a flaw introduced by the optics and sensor.
The trouble is that fluorescence imaging uses several distinct colors (wavelengths) of light at once, and each one fades differently across the frame. A single blanket brightness fix applied to the whole image leaves some colors overcorrected and others undercorrected.
Sony's patent describes a system that calculates a tailored correction number for each fluorescence wavelength separately, then applies those numbers to the image so every color ends up evenly lit. The goal is a cleaner, more accurate picture for whoever is reading the feed.
… calculate a correction coefficient per fluorescence wavelength, based on a captured image output from an imaging section, the correction coefficient being a coefficient for correcting shading of the captured image …
Translation: It figures out how much to adjust the brightness for each specific glowing color captured by the camera.
How the system calculates a fix for each light wavelength
The patent centers on two linked components inside an information processing apparatus connected to a fluorescence imaging camera.
First, a calculation unit analyzes the raw captured image and derives a correction coefficient for each fluorescence wavelength. A correction coefficient is essentially a multiplier: a number that, when applied to each pixel, brings its brightness in line with what it should be. Because different wavelengths of fluorescent light spread and fade at different rates across a sensor, the system computes a separate coefficient set for each one rather than a single shared value.
Second, a correction unit takes those coefficients and applies them to the captured image on a per-wavelength basis, performing shading correction (the process of evening out brightness across a frame). The result is an image where the intensity of each fluorescence color is consistent from center to edge.
- Reads the raw output from an imaging section (the camera)
- Calculates one correction coefficient per fluorescence wavelength
- Applies each coefficient to its matching wavelength channel in the image
- Outputs a shading-corrected image across all fluorescence channels
… perform shading correction on the captured image per fluorescence wavelength, based on the correction coefficient …
Translation: It then fixes the uneven lighting in the picture for each individual fluorescent wavelength.
What this means for surgeons reading fluorescence camera feeds
Fluorescence imaging is widely used in minimally invasive surgery, where a dye injected into the body glows under specific light and helps surgeons identify blood vessels, tumors, or bile ducts they otherwise could not see. If the image is unevenly lit, a structure at the edge of the frame might look dimmer or less distinct than one in the center, even when both are equally real. That matters in the operating room.
Sony's steady investment in medical imaging patents suggests the company sees surgical camera systems as a long-term business. This particular filing is narrow and technical, focused on a well-known image-quality problem. Whether it translates into a visible improvement on actual imaging hardware depends on how much shading currently degrades real-world fluorescence feeds.
That makes this Sony's 60th filing in our camera coverage we've tracked since May, alongside one on mixed camera and scanner arrays and one on cameras blinding each other.
Shading artifacts in fluorescence-guided surgery are not a minor image quality complaint. When brightness falls off unevenly across a surgical camera's view, the edges of the frame, exactly where a surgeon needs clear information about tissue boundaries, become less reliable.
Every wavelength of fluorescent light behaves differently on the same sensor, which means a single brightness correction applied across all of them will fix some channels while leaving others distorted. Calculating a separate correction coefficient for each wavelength is a direct answer to that specific failure mode.
Whether this matters in practice depends on how well the implementation holds up under real operating room conditions, something a patent filing cannot demonstrate on its own. But the problem it targets is concrete, the cost of getting it wrong falls on patients, and the approach is proportionate to the difficulty.
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The drawings
18 drawing sheets from US 2026/0268463 A1 · click any drawing to enlarge
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