Add Bookmark | Recommend this book | Back to the book page | My bookshelf | Mobile Reading

Free Web Novel,Novel online - All in hlnovel.com -> Prose -> Nine Dishui¡¤Corpse Investigation Series (7 volumes in total)

Pink Lady ¡¤ 4

Previous page        Return to Catalog        Next page

    You can search for "Nine Drops of Water¡¤Corpse Investigation Department Series (7 volumes in total)" on Baidu to find the latest chapters!

    The investigation ended at just the right time, and we sent the body to the funeral parlor just as people gathered.  An autopsy revealed no key clues, and three hours later, the body was pushed into a freezer.

    In the trace inspection room, A Le started to beat me.

    "What are you going to do?"

    "I want to find the footprints inside the feet." I used scissors to cut off the uppers of the disposable slippers, leaving only the soles.

    "Is this what you're talking about?"

    "Yes, in-foot footprints are also called insole footprints in our traceology. They refer to the process of walking barefoot or wearing socks, with the insole or insole as the carrier, after repeated contact, friction and extrusion.  The imprints left behind. The soles of people's feet have been trampled on the insoles for a long time, causing repeated friction movements. The soles of the feet or the various protruding parts of the soles of the feet wearing socks come into contact with them. The human body's sweat overflows through the many sweat pores on the papilla patterns of the skin of the soles of the feet, and interacts with them.  The dirt on the soles of the feet or socks is mixed and adheres to the insoles or insoles of the shoes. Coupled with the influence of the body's own gravity, it is easy to form clear marks. Moreover, the insoles of disposable hotel slippers are white, which is more convenient  Discovered by us.¡±

    "Didn't you extract the footprints at the scene? What's the use of the footprints on the inner soles of the shoes?"

    I shook my head and said, "My father often said this to me: 'We who work in technology are most afraid of preconceptions.' Although there are barefoot footprints in the bathroom, there are certain variables, in case the floor attendant does not clean it  Clean, what if it was left by the previous guest? If we unilaterally determine that it was left by the suspect, it is likely to lead to a deviation in the direction of the investigation. But the insole footprints on the slippers are different. We have confirmed that the slippers  It is the one worn by the suspect. If the insole footprints on the slippers also have the characteristics of foot deformation, then this characteristic of the murderer can basically be determined."

    "That's it."

    "Come on, let's hurry up. After I measure the data, I have to hand over the shoes to Lao Xian."

    "Extract DNA?"

    "Yes, it is easy to find exfoliated cells in the foot shoe prints in this kind of sweat."

    "I x, are there any details that you can't discover?" A Le gave a thumbs up.

    "I accept your compliment."

    After teasing, I quickly entered the comparison state. The principle of identifying the two types of footprints is very simple. Scale the photos of the insole footprints and the photos of the footprints extracted at the scene in the same proportion. As long as the data match, the type can basically be identified.  In just half an hour, I sent the slippers to Lao Xian's laboratory.

    When I returned from the laboratory, Fat Lei¡¯s office was hidden. His two fat hands were clicking the mouse in front of the computer. The screen was full of software icons the size of rice grains, which made me feel like I was having an attack of trypophobia.

    "Brother Lei, what are you doing?" I opened the door and walked in.

    "License plate!" Pang Lei said, pointing to a blurry photo on the screen.

    "What license plate?"

    "According to the time period that Brother Ming told me about the crime, I retrieved all the videos around the crime scene and found an image of the deceased. He was delivered by a black car. The video was a bit blurry. I am processing it.  image."

    "Is it difficult?"

    ¡°A little bit, but it¡¯s not very difficult.¡±

    Hearing what Fat Lei said, I instantly relaxed a lot. I lit a cigarette for him: "But having said that, I am really curious about your ability to process images. What is the principle behind it?"

    "Pang Lei took two puffs of his cigarette with great enjoyment and said relaxedly: "The principle is actually very simple, but every other line is like a mountain. You don't know much about the formation of the image, so it feels very mysterious."

    "Oh? I'm all ears."

    "Imagically speaking, blurred images are roughly divided into five types. The first type is incorrectly exposed blurred images, which are caused by underexposure or overexposure during shooting; the second type are motion blurred images, which are caused by the camera and the subject during shooting.  There is a large relative movement between the photographed objects, and the shutter speed of the photograph is relatively low; the third type, defocused blurred image, is due to the inaccurate focus of the lens, making the main image of the photographed object blurred; the fourth type,  It is the noise interference blurred image, which is due to the existence of noise interference in the imaging system, which is randomly attached to the image; the fifth type is the diffraction blurred image, which is due to the limited actual aperture size of the photography system and the diffraction effect of light, which makes the photoelectricity of the scene  A light spot is formed on the imaging surface and becomes a diffraction blurred image.

    ¡°Now that we know the formation principle of blurry images, we need to analyze the essence of the images.: In fact, an image is composed of several single frames, usually 25 frames per second. Ideally, if the captured image is clear, each image should contain relatively complete and valuable information, such as  Clear license plate numbers, portraits with distinct facial features, etc. However, due to the above reasons, the information in a single frame image will be very incomplete, resulting in the loss of some important information.

    "However, from another perspective, the distribution of image noise is random. The information lost in a certain frame of image can often be found in other frames of images. The principle of processing blurred images is actually to fuse all images into  Together, by integrating useful information, you can obtain more complete image information."

    "That is to say, Brother Lei, you want to find all the images in every frame?"

    "Yeah, right."

    "My x, 25 frames per second, that's 1,500 pictures per minute. Is this a job done by humans? I guess you are the only one who can sit still." I was really surprised by Fat Lei's perseverance.

    "It's not that exaggerated. In fact, at the critical moment, it only takes about ten seconds to get it done. Your brother and I are a veteran. Can you please stop using my rookie mentality to judge me?" Fat Lei winked at me confidently.

    "Yes, you win. Waiting for your good news!"

    "It's probably about half an hour away."

    "That's it. As soon as Lao Xian's meeting is over, we can have a meeting." I stretched out and lay down on the sofa in Fat Lei's office.  (Remember the website address: www.hlnovel.com
Didn't finish reading? Add this book to your favoritesI'm a member and bookmarked this chapterCopy the address of this book and recommend it to your friends for pointsChapter error? Click here to report