BZ City Criminal Investigation Detachment Investigation Office.

Wang Hao organized his own people to begin DNA identification and analysis of the physical evidence collected in the basement.

Lu Chuan also began to identify and analyze the thirteen fuzzy pockmarked face fingerprints.

In addition, some footprints were also collected in the basement, and Lu Chuan also had to be identified and analyzed.

"You will do this too?"

Wang Hao was a little surprised to see that Lu Chuan was processing the footprint picture, the footprint analysis was different from the fingerprint identification.

Fingerprint identification and analysis, not to mention the criminal police who specialize in eating this bowl of rice, are the ordinary police officers of the police station, and most of them can also participate.

However, footprint analysis, compared with fingerprint identification, is much less popularized.

Even Wang Hao himself can only use formulas such as seven times the length of the soles of his feet to set out the height information of the owner of the footprints.

And this bit of information is obviously far from the real footprint analysis.

Lu Chuan took out a pack of soft China, opened it, and handed it to Wang Hao: "I understand a little bit, I just heard that Chen Gang didn't explain anything, I thought that there should be a lot of traces left by him in the basement, and I am not afraid that he will not pick it up." ”

Wang Hao was a little surprised to take the soft China handed over by Lu Chuan, and understood in his heart.

My initial guess was right, this Lu Chuanjin task force seems to be really not just because of good technology?

How many serious cops smoke soft China?

All fronts are in full swing!

Although Li Donglin is from a technical background, he does have ideas for handling cases.

At present, three more lines are advancing.

On the one hand, it is mainly for Chen Gang's pre-trial, since the hard one can't work, he can only come over the soft one.

Chen Gang is a native of Haizhou City, and Qin Yong is already contacting his parents to try to emotionalize him with affection.

The other party is Lu Chuan, who did it through technical means to get more evidence.

On the other hand, there are biotechnology companies that pay Wang Manli, and the owner or major shareholder of these companies is a person named Wang Liang.

There are experts in the task force who are investigating and are tracking down the information of the other party, but there is no progress yet.

The other party registered a short company, and the actual address does not have the existence of this Wang Liang.

Lu Chuan, who has mastered advanced fingerprint identification and analysis skills, has also greatly improved his speed when processing footprint pictures.

The data was measured, calculated, and compared with Chen Gang's footprint samples, and the same identification was quickly made.

This time, the footprint identification is a little different from what Lu Chuan has done in the past.

In the past, it was more difficult to analyze the owner's physical signs through the footprints of the crime scene.

And this time, you only need to prove that the footprints in the basement are Chen Gang's footprints.

It's a lot simpler.

The next step is the identification and analysis of thirteen pasted fingerprints.

This time, Lu Chuan did not directly use the image processing software that comes with the fingerprint comparison system to preprocess the fingerprint.

Instead, I used professional PS image processing software.

Blurry fingerprints, with several layers superimposed on top of each other, need to layer the fingerprint picture.

This function is not up to the task of the image processing software that comes with the system.

There is also the processing of clarity, which can be said to be the most important ability in Lu Chuan's advanced fingerprint identification analysis.

The clarity processing of fingerprints is simpler than that of ordinary photo clarity processing.

After all, fingerprint images are just some complex, intertwined, and crushed lines.

Unlike ordinary images, which involve a change in color.

But even then, it's not a simple job.

In order to sort out a messy fingerprint image into a clearer image that can be identified and analyzed, it requires superb mathematical knowledge and image processing knowledge.

As for why we use mathematics, it has to do with the principles of computers.

Any data stored in a computer is actually a binary "0" and "1" relationship.

The fingerprint image that Lu Chuan saw on the computer screen was essentially a digital transformation.

Ten fingers interlaced, Lu Chuan first transformed the figure.

Here, he uses orthogonal functions and orthogonal matrices to make a two-dimensional linear invertible transformation of the original image.

Professionally speaking, it is to transform the original image, that is, the spatial domain image, into a transformation domain image with functions and matrices, which is more conducive to feature extraction, enhancement, compression and image encoding of the image.

Then, Lu Chuan used the Fourier transform to analyze the characteristics of the two-dimensional spectrum of the original image.

This alone is not enough, Lu Chuan will also use the Walsh-Adama transform, which is an operation to add and subtract the two-bit spectrum of the image, which can complete the secondary editing of the image on the basis of the Fourier transform.

Finally, there is the discrete Kafner-Lévy transform, which is the last method for image filtering, compression, and clarity purification.

Of course, among the skills that Lu Chuan obtained, there are also cosine transformation, sine transformation, Hal transformation and oblique transformation, etc., but to deal with fingerprints of different degrees of badness, the treatment methods chosen to use are also different.

The fingerprint now being processed works best with the Fourier transform, Walsh-Adama transform, and discrete Kafner-Lévy transform in the experience of advanced fingerprint identification analysis skills.

Focused men are most likely to gain favor with the opposite sex, and this seems to be a proverb everywhere.

Hu Xiaoyue, a college student who only came in the Investigation Office of the BZ City Criminal Investigation Detachment last year, is still in the stage of miscellaneous work.

As soon as he followed Wang Hao's instructions and came over to pour tea for Lu Chuan, he saw the images on the computer screen like magical changes and piles of flowing data.

Where is this fingerprint identification and analysis, the whole Matrix Empire.

In addition, Lu Chuan's angular side face has a magical color under the flickering of the blue light on the computer screen.

So, some strange scenes were staged, Lu Chuan stared at the computer screen, his hands dancing quickly on the keyboard.

Behind him, a tall policewoman in a police uniform, holding a teacup, stared at Lu Chuan in front of the computer for a moment.

Forensic Doctor Shen obviously couldn't see this scene.

Thirteen fingerprints, which are not slow to process.

With the blessing of advanced fingerprint identification and analysis skills, Lu Chuan can process a fingerprint in about twenty minutes.

Hu Xiaoyue was surprised to witness the process of how a pasty-like fingerprint became a normal fingerprint.

It's as if this fingerprint went to the country of sticks and did the most delicate cosmetic surgery.

The face is still the same face, but it's not all the same face.

The eyes are bigger, the nose is straighter, and the lips are plump.

Every detail is comforting.

The fingerprint comparison system of the Binhai City Criminal Investigation Detachment is the same as the fingerprint comparison system of Haizhou City, and Lu Chuan's account can still be logged in here.

After a fingerprint is processed, the thirteen special points are also marked.

A string of data is generated below the fingerprint, and the coordinate data of each feature point begins to enter the system.

Lu Chuan still chose the exact match mode.

After processing the system data, Lu Chuan minimized the interface and dragged the second fingerprint image into the interface where the PS software processed the image.

Again, the number of graphs is transformed, and the number of graphs is transformed again.